Tektronix 11A52, Service Manual

Page 1: ...TEK Service M a n u a l 11A52 Extended Service COMMITTED TO EXCELLENCE ...

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Page 3: ... WARNING The following servicing instructions are for use by qualified personnel only To avoid personal injury do not perform any servicing unless you are qualified to do so Refer to the Safety Summary prior to performing any service Please check for CHANGE INFORMATION at the rear of this manual Serial Number lektron COMMITTED TO EXCELLENCE ...

Page 4: ...ektronix Inc Beaverton Oregon USA Tektronix Guernsey Ltd Channel Islands Tektronix United Kingdom Ltd London Sony Tektronix Japan Tektronix Holland NV Heerenveen The Netherlands Instruments manufactured for Tektronix by external vendors outside the United States are assigned a two digit al pha code to identify the country of manufacture e g JP for Japan HK for Hong Kong etc Tektronix Inc P O Box 5...

Page 5: ...rate Normal 1 relay 2 4 AC DC Coupling 2 relay 2 4 lOX lX 3 relay 2 5 lOX lX 4 relay 2 5 Attenuator States 2 5 DC 2 5 Off 2 5 AC 2 5 Calibration 2 6 Input Overload Sensing 2 6 Fuse Check Circuit 2 6 Relay Fast Power On RFPO 2 6 Kernel 2 7 Analog Control Voltage System 2 7 Analog to Digital Converter 2 8 Random Access Memory 2 9 Read Mode 2 9 Write Mode 2 9 Data Retention Mode 2 9 Calipration Buffe...

Page 6: ...le Connectors 3 10 How to Remove the Front Panel 3 11 v How to Install the Front Panel o 3 11 How to Replace a Front Panel Board 3 11 How to Remove the Main Board 3 12 How to Install the Main Board 3 13 How to Remove and Replace a BNC Connector Assembly BCA 3 14 How to Remove an Attenuator Assembly AA 3 14 How to Install an Attenuator Assembly AA 3 14 Soldering Techniques 3 15 Troubleshooting 3 17...

Page 7: ...CVS TEST 4 9 Calconstant Diagnostics 4 11 PROBE GAIN 4 12 ATTEN GAIN 4 13 STEP GAIN 4 13 BWLMATCH 4 13 GAIN 4 13 OUTPUTERR 4 14 BALANCE 4 14 COARSE DAC 4 14 FINE DAC 4 15 SPARE GAIN 4 15 PRB COARSE 4 15 PRB FINE 4 15 PRB IMBAL 4 16 BIAS COMP 4 16 BIAS ERROR 4 16 Explain Cal EXPLAINCAL 4 17 ATTEN GAIN 4 18 STEP GAIN 4 18 BWL MATCH 4 18 GAIN 4 19 Calconstant Dumper CC DUMPER 4 19 GainOff 4 20 GainOn...

Page 8: ...Board Illustrations Section 7 Replaceable Mechanical Parts Change Information Related Documentation The Replaceable Parts Section at the rear of this manual lists the Tektronix part numbers for all Standard and Optional Accessories provided with this product iv 11A52 Extended Service Manual ...

Page 9: ...Exploded View of Housekeeper IC 3 6 Details of Hypcon Connectors 3 8 Peltola Coaxial Cable Connector Assembly 3 10 Nut blocks and Heat Sink Retaining Screws 3 12 How the Main Board fits in the Frame 3 13 Recommended Desoldering Sequence 3 16 Resistor Color Codes 3 18 Semiconductor Lead Configurations 3 19 Multi Pin Connector Orientation 3 20 Sample LED Fault Code Timing Diagram 4 2 Diagnostic Test...

Page 10: ...t Bits 2 10 Miscellaneous Pins 2 11 U600 Signals 2 11 DAC Latch Control Lines 2 13 Bandwidth Limit vs BPO and BPI Bits 2 16 Gain Set by GPO GPl and GP2 Bits 2 16 Relative Susceptibility to Damage from Static Discharge 3 4 11A52 Diagnostic Routines 4 6 Bits to Sample and Hold Farm Pin Numbers 4 10 Meanings of k Z and j Y characters 4 17 11A52 Extended Service Manual ...

Page 11: ...mage to the equipment or other property WARNING statements identify conditions or practices that could result in personal injury or loss of life CAUTION indicates personal injury hazard not immediately accessible as one reads the marking or a hazard to property including the equipment itself DANGER indicates a personal injury hazard immediately accessible as one reads the marking Static Sensitive ...

Page 12: ...to a prop erly wired receptacle before connecting to the product input or output terminals A protective ground connection by way of the grounding conductor in the oscillo scope power cord is essential for safe operation Upon loss of the protective ground connection all accessible conductive parts in cluding knobs and controls that may appear to be insulating can render an electric shock To avoid e...

Page 13: ... _________Section 1 General Information C ro s ro I I s 0 I 9 I 0 s ...

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Page 15: ...output to the host oscilloscope Each of those outputs may be comprised of any oscilloscope specified combination of the two input signals The 11A52 also provides an auxiliary output from each channel to the oscilloscope Display and trigger signals can be independently inverted and summed Each channel has a TEKPROBE input connector which accepts Level 1 and Level 2 TEKPROBE any other probe with a B...

Page 16: ...loscope service manual To install the 11A52 in any compatible 1100 series oscilloscope mainframe set the oscilloscope ON STANDBY switch to STANDBY see CAUTION above Align the grooves in the top and bottom of the 11A52 with the guides in the oscilloscope amplifier compartment then insert the 11A52 into the oscilloscope until its front panel is flush with the front panel of the oscilloscope To remov...

Page 17: ...it for use package the 11A52 as follows 1 Obtain a corrugated cardboard carton with inside dimensions at least six inches greater than the amplifier s dimensions Use a carton with a test strength of at least 200 pounds 2 Fully wrap the 11A52 with anti static sheeting or its equivalent to protect the finish 3 Cushion the 11A52 on all sides by tightly packing dunnage or urethrane foam between the ca...

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Page 19: ... ___________section 2 Theory ...

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Page 21: ...rigger and auxiliary signal paths The 11A52 plug in unit functions are accessible only through the oscilloscope Since there are no mechanical switch settings the 11A52 does not remember deflection factor offset or bandwidth settings when the host oscilloscope power is shut off although it does remember internally stored calibration constants Past settings are therefore stored in the host oscillosc...

Page 22: ...eters in the Housekeeper IC Then the Housekeeper IC sequentially turns any of the channels on or off under control of the oscilloscope s channel switch sequencing signals The Amplifier s step gain and bandwidth settings are controlled via an extension of the MPU s external data bus that is provided by the Housekeeper IC The MPV uses an analog to digital A D converter to read the value of the Overl...

Page 23: ...lifier ___ Probe Ch2 Offset Front Panel Variable Gain Offset Mainframe Pushbuttons LEDS MPU ROM Bandwidth Control RAM Gain Control and Chan Switching Data 8 ACVS __ ACVS Data I Housekeeper S H ADAS IC Chan Switch Sea Serial Data Overload Sense Probe Data Multiplex ND Converter 7391 201 Figure 2 1 11A52 Basic Block Diagram 11A52 Extended Service Manual 2 3 ...

Page 24: ...rmal 1 relay With the Cal Norm relay in the Cal position relay not energized the front panel input signal is disconnected and the attenuator input comes from pin 2 of the attenuator socket on the main circuit board With the Cal Norm relay in the Norm position relay energized the front panel input signal is connected to the input of the 2 relay on the attenuator The signal voltage at pin 2 of the a...

Page 25: ...tenuator networks are correct when the output of the attenuators drive a 50 Q termination the main amplifiers incorporate 50 Q terminations at their inputs Attenuator States DC This is the most used attenuator state Here the Cal Norm relay is set to select the input signal The AC DC relay selects DC and the two lOX lX relays are set for the required attenuation factors Whenever lOX attenuation is ...

Page 26: ... intact In normal operation the l 18 Vindicates that the probe power supplies are all functioning properly If any fuse fails the FUSE CHECK output will change by at least 1 V and the DAC as directed by the processor will acquire the new signal level If the FUSE CHECK signal is not close to 1 18 V the processor will send an error message to the oscilloscope display after power up Diodes CR1045 and ...

Page 27: ... drives both the DAC and the Sample Hold modules Every 30 µs U630 is driven to one of 16 voltage levels stored in U600 s memory Each AlAl output is updated every 300 µs while each A1A2 output is updated every 1200 µs or 1 4 as often The DAC is a two byte latched data unit which means that the high and low data bytes are loaded separately into the DAC U600 produces LCLK and UCLK which together cont...

Page 28: ...nalog input for MINTST AlA2 self test A9 AlO 12 Analog input for MAJTST AlAl self test All internal self test of A D 1 2 REF REF voltage Address in 17 Serial address input used to select A D input AO All Sys Clock 19 Runs the AID conversion hardware I 0 Clock 18 Serial I O clock input CS L 15 Enables A D converter I 0 and conversion Data out 16 Serial data output REF 14 Positive reference for the ...

Page 29: ...as SD is greater than 4 S V and write protects at 4 2S V nominal Data are maintained in the absence of SD with no additional support circuitry RAM U801 constantly monitors SD Should the supply voltage decay the RAM will automatically write protect itself all RAM inputs become don t care and all outputs are high impedance As SD falls below approximately 3 0 V the power switching circuit connects th...

Page 30: ...r the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Output for the adrs latch bi directional data bus Attenuato...

Page 31: ...an ACVS system with up to 16 analog outputs and multiplexed output drivers for setting the gain and bandwidth control bitsfor both plug in channels In table 2 4 I Input 0 Output BI Bi directional Signal Pin WR L 23 INT 22 cs 21 PSEN L 20 ALE 18 RD L 24 ADO 17 ADl 16 AD2 15 11A52 Extended Service Manual Desc I 0 I I I I Bi Bi Bi TABLE2 4 U600 Signals Usage Writes data into U600 Interrupt to process...

Page 32: ...O 49 0 Gain bit 0 GPl so 0 Gain bit 1 GP2 Sl 0 Gain bit 2 DO 61 0 DAC data bit 0 Dl 60 0 DAC data bit 1 D2 S9 0 DAC data bit 2 D3 S8 0 DAC data bit 3 D4 S7 0 DAC data bit 4 DS S6 0 DAC data bit 5 D6 SS 0 DAC data bit 6 D7 54 0 DAC data bit 7 MINSTB L 62 0 Sample Hold module 2 sample strobe MAJSTB L 63 0 Sample Hold module 1 sample strobe ARAO S2 0 Sample Hold module output select address bit 0 ARA...

Page 33: ...igh In the 11A52 the CS L signal is tied low so the DAC is always receptive to having the latches loaded Once the 12 bit digital value is loaded that value is converted to an analog current at the minus input of the on chip operational amplifier The op amp adjusts its output such that the minus input of the op amp is always at GND potential In this manner the DAC current is converted to an output ...

Page 34: ...660 will produce a low on RESET after 13 ms Capacitor C660 sets this delay time When RESET goes low the CPU can begin executing stored instructions At power down when the SD supply decays to 4 SS V U660 sets RESET high Analog Control Signal Amplifiers 3 This section describes the electrical operation and relationship of circuits in the analog control circuitry and signal amplifiers See Schematic 3...

Page 35: ...amplifier channel the COARSE offset is designed to be 20 times larger than the FINE offset The BALANCE lines are used to correct both input and output offset voltage errors in the main amplifiers The typical maximum voltages available to the main amplifiers from the COARSE FINE and BALANCE controls measured at L210 and L530 are as follows COARSE FINE BALANCE 1 0178 v 0 0506 v 0 0629 v Components L...

Page 36: ...d on turned off or inverted using the OUTPUT INVERT and OUTPUT ON control lines pins 11 12 15 16 17 18 c Two four pole bandwidth limit filters one at 20 MHz and another at 100 MHz See Table 2 6 TABLE2 6 Bandwidth Limit vs BPO and BP1 Bits Bandwidth BPl BPO 20MHz 0 0 lOOMHz 0 1 Maximum 1 x d Six gain settings of 1 mV 2 mV 5 mV 10 mV 20 mV and 50 mV per division See Table 2 7 TABLE2 7 Gain Setby GPO...

Page 37: ...idge biasing network in the main amplifiers R6SO R6Sl R6S2 and R6S3 prnvide additional power supply noise rejection The outputs of the signal amplifiers are reverse terminated in 100 Q impedance matching the output transmission lines leaving the hybrids The Display and Trigger signal paths for both channels separately sum before reaching the edge connector at the summation points the line impedanc...

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Page 39: ... _________Section 3 Maintenance ...

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Page 41: ...ves in the frame rails To remove a panel pry the panel out beginning at the rear of the side To install a panel position it over the frame rail grooves then press down until the panel snaps into place Exert pressure along the full length of the rails to secure the panel NOTE The 11A52 will not slide into the oscilloscope if the side panels are not fully seated in the rails Cleaning The 11A52 shoul...

Page 42: ... or a cloth dampened with a mild solution of detergent and water A cotton tipped swab is useful for cleaning in narrow spaces or for cleaning more delicate circuit components However do not use cotton tipped swabs near Hypcon connectors CAUTION Be sure that circuit boards and components are dry before applying power Otherwise electrical damage may result Visual Inspection The 11A52 should be inspe...

Page 43: ...ent parts check the parts list for value tolerance rating and description NOTE When selecting replacement parts remember that the physical size and shape of a component may affect its performance in the amplifier All replacement parts should be direct replacements unless you know that a different component will not adversely affect amplifier performance Some parts are manufactured or selected by T...

Page 44: ... 8 9 Voltage discharged from a 100 pF capacitor through a resistance of 100 ohms Observe the following precautions to avoid damage 1 Minimize handling of static sensitive components 2 Transport and store static sensitive components or assemblies in their original containers on a metal rail or conductive foam Label any package that contains static sensitive assemblies or components 3 Discharge the ...

Page 45: ...lifier When semiconductors are replaced check the operation of circuits which may be affected Replacement semiconductors should be of the original type or a direct replacement Lead configurations of the semiconductors used in this oscilloscope are shown in Figure 3 8 Semiconductor Lead Configurations in this section CAUTION Do not remove stickers affixed to the top of EPROMs Removing this sticker ...

Page 46: ...Push the cover down keeping it flat on the IC and slide into place Hold the cover in place while moving the retaining clip over the tabs on the other end How to Replace Amplifier Hybrid Circuits The Hypcon HYbrid Printed CONnector connector is designed to provide low loss electrical and thermally efficient connection between the printed circuit board and hybrid integrated circuit Figure 3 2 shows ...

Page 47: ...l 4 Flush the hybrid and Hypcon connector mounting area with isopropyl alcohol Do not scrub with a cotton tipped swab as cotton fibers will adhere to edges and surfaces of contact areas and cause open or intermittent connections The elastomer should be examined under light for dust hair etc before it is re installed If the etched circuit board surfaces require more cleaning scrub with a soft rubbe...

Page 48: ...ON CONNECTOR SCREW WASHER ASSY 4 I PLASTIC FRAME MICROCIRCUIT STIFFENER HEAT SINK CROSS SECTION VIEW OF HYPCON CONNECTOR CONTACT I REGISTRATION PINS 7391 305 Figure 3 2a Details of Hypcon Connectors 3 8 11A52 Extended Service Manual I ...

Page 49: ...TE Cleaniness is very important Small hairs and elastomer flash under the contacts which are almost invisible to the naked eye will prevent good electrical contact Most apparent failures of the hybrid are actually due to contamination of the Hypcon Do not touch the the gold plated contacts with fingers b Place the hybrid into the square hole in circuit board The hybrid is keyed so that it will fit...

Page 50: ...nd that the damaged cable be replaced as a unit For cable part numbers see Section 7 Replaceable Mechanical Parts An alternative solution is to refer the replacement of the defective connector to your local Tektronix Field Office or representative Figure 3 3 shows the parts of a Peltola coaxial cable connector assembly 3 10 m SOCKET RECEPTACLE HOLE SOCKET HOLE 7391 306 Figure 3 3 Peltola Coaxial C...

Page 51: ... the front panel so that the notch in the bottom fits over the latch rod then carefully insert the four front panel tabs into the slots in the front subpanel You may need to pull the top and bottom frames away from the subpanel to allow the front panel tabs to fit between the casting and the frames 6 Gently snap the edges of the front panel into place around the input connectors and the outer edge...

Page 52: ... board to the top and bottom frames Figure 3 4 shows the nut blocks 5 Use a Torx T 7 screwdriver to remove the four screws that fasten the heat sink to the to and bottom frames Figure 3 4 shows these screws 6 Use a Torx T 15 screwdriver to remove the four screws that fasten the plastic rear panel to the top and bottom frames 7 Carefully withdraw the Main board from between the frames L_ i f HEAT S...

Page 53: ...e four screws that fasten the heat sink to the top and bottom frames 5 Use a Torx T 9 screwdriver to install the six screws and nut blocks that clamp the Main board to the top and bottom frames 6 Plug the Main board assembly into its socket Be carefully not to bend its pins 7 Connect the cable from the Front Panel board to its connector on the Main board 8 Tighten the four screws that you started ...

Page 54: ...the BCA to the front subpanel 9 Plug the probe information connector into its socket on the Main board 10 Plug the coaxial end lead connector from the attenuator into the BCA For best result proceed as follows a Check that the center conductor is straight Straighten if necessary b Plug the connector straight into the receptacle 11 Install the front panel as outlined in How to Install the Front Pan...

Page 55: ...y and accuracy of this plug in can be maintained only if proper soldering techniques are used when repairing or replacing parts The desoldering and removing of parts is especially critical and should be done only with a vacuum solder extractor preferably one approved by a Tektronix Inc Service Center To prevent damaging the pins use an extracting tool to remove in line integrated circuits A tool i...

Page 56: ...ctices the board is unusable and must be replaced Damage can void warranty CAUTION Only an experienced maintenance person proficient in the use of vacuum type desoldering equipment should attempt repair of any board in this plug in When soldering on circuit boards or small wiring use only a 15 watt pencil type soldering iron A higher wattage soldering irori can cause the etched circuit wiring to s...

Page 57: ...tration of the plug in unit showing circuit board placement is provided on the first page of Section 6 Schematic Diagrams and Circuit Board Illustrations A circuit board component illustration is shown adjacent to the first schematic diagram associated with a specific circuit board Each schematic diagram in Section 6 has a grid matrix with an index to help locate components contained in that schem...

Page 58: ...RES 0 1 2 3 4 5 6 7 8 9 Figure 3 7 Resistor Color Codes Wiring Color Code RESISTORS MULTIPLIER TOLERANCE OHMS 1 10 1 102 or 100 2 103 or 1 K 3 104 or 10 K 4 105 or 100 K 1 2 106 or 1 M 1 4 1 10 10 1 or 0 1 5 10 2 or 0 01 10 20 7391 301 Some wiring is done with multi conductor ribbon cables with differently colored conductors The colors of these cables follow the EIA color code and the brown conduc...

Page 59: ...CATIONS ANODE CATHODE SIGNAL DIODE MICROPROCESSOR INDEX B PLASTIC CASED TRANSISTORS 16 1 16 PIN MINI PACIC INDEX 36 PIN HYPCON HYBRID 4 BOTTOM VIEWS LEDs 61 60 68 PIN SLAM PACK Maintenance 44 43 _ DUAL IN LINE PACKAGE ICs 7391 302 Figure 3 8 Semiconductor Lead Configurations 11A52 Extended Service Manual 3 19 ...

Page 60: ...holders When connecting the holder to its row of pins on the circuit board orient the holder to align its triangle with the triangle on the circuit board see Fig 3 9 3 20 HOLDER END LEAD MULTI PIN CONNECTOR MULTI PIN CONNECTOR INDEX Figure 3 9 Multi Pin Connector Orientation 7391 303 11A52 Extended Service Manual ...

Page 61: ...Recommended type Tektronix part 067 1261 00 Flexible Extender B Signal Pickoff Purpose Troubleshooting the circuit boards Recommended type Tektronix part 067 1262 00 Signal Pickoff Connector C Signal Standardizer Purpose Troubleshooting the circuit boards Recommended type Tektronix part 067 0587 02 Signal Standardizer D Normalizer Purpose Troubleshooting the circuit boards Recommended type Tektron...

Page 62: ...g the replacement procedures given under Corrective Maintenance 1 Check Control Settings Incorrect control settings can indicate a nonexistent trouble If there is any question about the correct function or operation of any control on the 11A52 refer to the Oscilloscope User s Reference Manual or Amplifier supplement 2 Check Associated Equipment Before proceeding with troubleshooting check that the...

Page 63: ...nsistor can most effectively be checked by substituting a new component for it or one which has been previously checked However be sure that circuit conditions are not such that a replacement transistor might also be damaged if substitute transistors are not available use a dynamic tester Static type testers are not recommended because they do not check operation under simulated operating conditio...

Page 64: ...value Capacitors A leaky or shorted capacitor can best be detected by checking resistance with an ohmmeter on the highest scale Do not exceed the voltage rating of the capacitor The resistance reading should be high after initial charge of the capacitor An open capacitor can best be detected with a capacitance meter or by checking that the capacitor passes ac signals 7 Repair and Adjust the Circui...

Page 65: ... _________Section 4 Diagnostics 0 JQ 0 rJl n rJl ...

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Page 67: ...has reset the amplifier begins a sequence of test routines to determine if its crucial systems are operating properly If any of these tests fail it is unlikely that the amplifier will operate correctly in a system Any failure is indicated by flashing a specific fault code on the front panel CH 1 and CH 2 LEDs This fault code indicates which kernel test is failing The fault code is read using the f...

Page 68: ...Dia nostics 4 2 CH1 LED ON OFF COUNT CH2 LED ON OFF 1 2 3 4 5 6 7 8 7391 401 Figure 4 1 Sample LED Fault Code Timing Diagram 11AS2 Extended Service Manual ...

Page 69: ...t until the power is removed Until the condition causing the RAM test to fail is corrected the amplifier will not be recognized by any oscilloscope in which it is install d The NVRAM test could corrupt calconstant data stored in NVRAM This can happen if the power is cycled removed during a narrow time window during the NVRAM test In this case the Calconstant Checksum will be corrupted and at the n...

Page 70: ...e oscilloscope via the DIAG CONFIG command All of the tests are executed regardless of their exit status When all tests are complete a TEST STATUS message is sent to the oscilloscope indicating a all tests passed or r the Area and Routine number of the first routine that failed If large numbers of tests failed the amplifier which has limited storage resources saves as much failure information as p...

Page 71: ...ic routine to be executed once and the results of the test to be reported upon completion Cycle mode is achieved by setting Terse mode in the mainframe Cycle tests are repeated indefinitely and are terminated by simultaneously pressing the amplifier s CH 1 and CH 2 front panel buttons Upon detecting the termination signal the amplifier will report the number of times the test was executed the numb...

Page 72: ...E GAIN Calconstants PROBE GAIN 5and7 2 Test PROBE COARSE OFFSET Calconstants PRB GAIN 5and7 3 Test PROBE FINE OFFSET Calconstants PRB FINE 5and7 4 Test PROBE IMBALANCE Calconstants PRB IMBAL 5and7 5 Test BIAS COMPENSATION Calconstants BIAS COMP 5and7 6 Test BIAS ERROR Calconstants BIAS ERROR 5and7 7 Calconstant Viewer CC DUMPER Same as 46 10 8 1 Gain Off Diagnostics GainOff 8 2 Gain On Diagnostics...

Page 73: ...nverter ADC or the voltages fed to the ADC Check Signal Path Calconstant Checksum CKSM PLUG The calconstants in the amplifier are protected by a checksum generated after a calibration cycle or after the amplifier calconstants are modified using the CAL CONST_SET command The calconstant checksum helps the amplifier detect the corruption of calconstants caused by external problems such as alpha part...

Page 74: ...e amplifier is either run through a calibration cycle or the CAL CONST_SET command is used to force a new calconstant checksum to be generated or one or more changes in probe attachment status have occurred The Address field is not used in this test and is zero The Actual field will be zero if the checksum was correct and nonzero with no significance to the value if the checksum was incorrect Test...

Page 75: ...fier will not work correctly Analog Control Voltage System Test ACVS TEST The amplifier relies upon a refreshed sample and hold system to generate all internal variable control voltages This system is called the Analog Control Voltage System ACVS for short The ACVS consists of a section of U600 the IC that contains the sequencing logic and refresh RAM a precision digital to analog converter along ...

Page 76: ...to a specific pin number on a Sample Hold Farm Table 4 2 relates bits to Sample Hold farm pin numbers MSB LSB TABLE4 2 Bits to Sample and Hold Farm Pin Numbers Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 11A52 1 20 1 22 2 20 2 22 1 19 1 23 2 19 2 23 1 17 1 14 2 17 2 14 1 15 1 16 2 15 2 16 The designation X YY indicates pin YY on Sample Hold Farm X For example suppose the ACVS test failed and returne...

Page 77: ...ns a large number of calconstant diagnostic routines that verify the accuracy of the last amplifier calibration cycle These tests do not test specific hardware Instead they examine the calibration constants generated by the last calibration cycle and apply mathematical models of an ideal amplifier signal path to these calconstants to determine theoretically if the various operating parameters of t...

Page 78: ...nostic routines are described here PROBE GAIN This test checks the gain error of the currently installed probe In order for the test to report results that accurately reflect the probe gain error a probe calibration cycle must have first been initiated on the probe being tested If a probe is installed and a probe calibration cycle has not been run on the probe the test will always give a very smal...

Page 79: ... be stored for later retrieval by the Explain Cal diagnostic Test Failure If the Step Gain test fails it indicates that one or more of the M377 step gain settings is not exhibiting the correct gain BWLMATCH This routine checks the bandwidth limit gain error calconstants for each bandwidth limit setting The calconstant for the bandwidth limit setting which exhibits the worst bandwidth limit gain er...

Page 80: ...ed error exceeds 0 55 division the test is flagged as failed Test Failure Failures in this routine may be caused by a oscilloscope with excessive input offset bad M377 ICs in the amplifier or faulty ACVS channel s in the amplifier BALANCE This routine checks the calconstants used in balancing the amplifier at various different gain settings The gain setting that has the worst balance error is foun...

Page 81: ... meaningful results only when a Level 2 offsettable probe is connected and has been run through a probe calibration cycle The test generates a percentage error in the scaling of the probe coarse offset by forming a ratio of the characterized probe coarse offset scaling versus an expected ideal scaling factor If the error exceeds 3 the test is flagged as failed Test Failure Failures here may be cau...

Page 82: ...r s input connector The test ensures that the resulting calconstant is within the allowable range of ACVS Bias correction adjustment The allowable range is from 0 999 to 0 999 If the calconstant indicates that more adjustment is needed than the circuitry provides the test is flagged as failed Test Failure The test failure may be caused by a failure in the ACVS channel used for bias compensation or...

Page 83: ...git of the fields has a particular meaning depending on which diagnostic test is being explained Each letter hijk WXYZ corresponds to a digit in the result returned by the Explain Cal diagnostic Unused digits in the fields are always zero The Actual field is not used and is always zero This diagnostic will always pass as it is simply used to retrieve information generated by other diagnostic routi...

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Page 85: ...race to the screen area Default calconstants are installed by the following procedure 1 Set the oscilloscope ON STANDBY switch to STANDBY and remove the amplifier from the oscilloscope 2 Remove the left side cover from the amplifier 3 Remove and rotate Jumper J611 see Figure 3 9 90 degrees to the horizontal position and reinsert J611 connecting the two horizontal pins together 4 Reinstall the ampl...

Page 86: ...step gain range with the lowest gain error Z encodes the index of the M377 step gain range with the highest gain error korZ 0 1 2 3 4 5 M377 Step Gain Range 1 mV div 2mV div SmV div lOmV div 20mV div SOmV div BWLMATCH h ADDRESS j k w EXPECTED x y z k encodes the index of the bandwidth limit setting which has the lowest bandwidth limit gain error Z encodes the index of the bandwidth limit setting w...

Page 87: ...e RAM The CC Dumper diagnostic never returns a Fail indication as it does not attempt to validate any calconstants its only purpose is to provide a method of querying the calconstants through the diagnostic user interface The diagnostic should be executed in Loop mode When so executed the calconstant number and the value stored in that particular calconstant location will be displayed The CH 1 and...

Page 88: ... through to its display output at roughly the correct gain The tested channel s attenuator is connected to the calibration reference voltage from the mainframe and placed in its lOX range The other channel is also connected to the reference but at lOOX attenuation Both channels variable gain controls are set at default values intended to result in design center path gains The mainframe is asked to...

Page 89: ...finished the amplifier calculates if there is any combination of bandwidth limit filters fine gain coarse gain and oscilloscope imbalance for which the amplifier cannot balance using the balance DAC This is the balance diagnostic routine At the time the calibration process runs the balance diagnostic the characterization of the signal paths gains has not been done and previous values for the gain ...

Page 90: ...ed appears at the top of the screen calibration is achieved After firmware V3 0 the Self Test does not poll Atten Gain Step Gain BWL Match or Output Err CKSM Plug Failure at Power up If a1 amplifier fails Self Test and the message Cksm Plug appears in the Routine area the amplifier calibration constants have been corrupted The most common cause of this is turning off the oscilloscope power during ...

Page 91: ... __________Section 5 Electrical Parts l fj ti n I n II ...

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Page 93: ... A23R1234 A23 R1234 Read Resistor 1234 of Assembly 23 Example b component number A23A2R1234 A23 A2 R1234 Assembly Subassembly L _number Circuit number Read Resistor 1234 of Subassembly 2 of Assembly 23 Only the circuit number will appear on the diagrams and circuit board illustrations Each diagram and circuit board illustration is clearly marked with the assembly number Assembly numbers are also m...

Page 94: ...D SAN DIEGO CA 92121 PO BOX 81543 PLANT NO 1 22526 DU PONT EI DE NEMOURS AND CO INC 515 FISHING CREEK RD NEW CLMBERLAND PA 17070 3007 DU PONT CONNECTOR SYSTEMS DIV MILITARY PRODUCTS GROUP 24355 ANALOG DEVICES INC RT 1 INDUSTRIAL PK NORWOOD MA 02062 PO BOX 9106 31433 KEMET ELECTRONICS CORP PO BOX 5928 GREENVILLE SC 29606 NATIONAL SALES HEADQUARTERS 50434 HEWLETT PACKARD CO 370 WTRIMBLE RD SAN JOSE ...

Page 95: ...RM42 2Y5V684Z25 AlC522 283 0059 00 CAP FXO CER OI lUF 80 20 25V 31433 C330Cl05M5R5CA AlC600 281 0775 00 CAP FXO CER OI 0 1UF 20 5DV 04222 MA205El04MAA AlC630 290 1157 00 CAP FXO ELCTLT 220UF 20 250VC TK1424 CEAFM1E221M T4 A1C640 283 0028 00 CAP FXO CER OI 0 0022UF 20 50V 59660 0805585Y5S0222M AlC650 281 0775 00 CAP FXO CER OI 0 1UF 20 5DV 04222 MA205E104MAA A1C651 281 0775 00 CAP FXO CER OI 0 1UF ...

Page 96: ... 1N4152 A1CR951 152 0141 02 B010346 SEMICOND DVC DI SW SI 30V 150MA 30V D0 35 03508 DA2527 1N4152 A1CR952 152 0141 02 B010346 SEMICOND DVC DI SW SI 30V 150MA 30V D0 35 03508 DA2527 1N4152 A1CR960 152 0141 02 SEMICOND DVC DI SW SI 30V 150MA 30V D0 35 03508 DA2527 1N4152 A1CR961 152 0141 02 B010346 SEMICOND DVC DI SW SI 30V 150MA 30V D0 35 03508 DA2527 1N4152 I A1CR1045 152 0322 00 SEMICOND DVC DI S...

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Page 98: ... OHM 1 0 2W TC TO 80009 322 3068 00 A1R948 322 3289 00 RES FXD FILM lOK OHM 1 0 2W TC TO 57668 CRB20 FXE lOKO AlRlOOl 322 3193 00 RES FXD FILM lK OHM 1 0 2W TC TO 57668 CR820 FXE lKOO A1R1005 322 3193 00 RES FXD FILM lK OHM 1 0 2W TC TO 57668 CRB20 FXE KOO A1Rl041 322 3385 00 RES FXD FILM lOOK OHM 1 0 2W TC TO 57668 CRB20 FXE lOOK A1R1046 322 3430 00 RES FXD FILM 294K OHM 1 0 2W TC TO 80009 322 34...

Page 99: ... TO 1 SELECTOR 02735 QHCT257EX98 MULTIPLEXER AlU940 155 0076 00 MICROCKT LINEAR INPUT PROTECTION 80009 155 0076 00 A1U945 155 0076 00 MICROCKT LINEAR INPUT PROTECTION 80009 155 0076 00 AlUlOOl 156 1065 01 MICROCKT 06TL LSTTL OCTAL 0 TYPE TRANS 04713 SN74LS373 ND JO AlU1005 156 0724 02 MICROCKT 06TL HEX INV W OC OUT SCRN 01295 SN74LS05NP3 A1VR451 152 0175 00 SEMICOND DVC OI ZEN SI 5 6V 5 0 5W D0 7 ...

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Page 101: ... GND Address Inputs Data In Data Out Chip Enable Write Enable Output Enable Power 5V Ground The OS1220Y 16k Nonvolatile SRAM is a 16 384 bit fully static nonvolatile RAM organized as 2048 words by 8 bits Each NV SRAM has a self contained lithium energy source and control circuitry that constantly monitor Vee for an out of tolerance condition When such a condition occurs the lithium energy source i...

Page 102: ... edge of CE or WE All address inputs must be kept valid throughout the write cycle WE must return to the high state for a minimum recovery time tWR before another cycle can be initiated The OE control signal should be kept inactive high during write cycles to avoid bus contention However if the output drivers are enabled CE and OE active then WE will disable the outputs in toow from its falling ed...

Page 103: ... _________Section 6 Schematic Diagrams and Circuit Board Illustrations ...

Page 104: ... l ...

Page 105: ...assemblyin the instrument is assigned an assembly number e g A20 The assembly number appears on the circuit board outline onthe diagram in the title for the circuit board component location illustration and in the lookup table for the schematic diagram and corresponding component locator illustration The Replaceable Electrical Parts list is arranged by assemblies in numerical sequence the componen...

Page 106: ...1 ustratlon on Reverse Side of 11A52 Block Diagram Circuit Board 11 ustratlon Not Shown Circuit Board 11 ustratlon Not Shown Circuit Board 11 ustration on Reverse Side of Figure 6 1 11A52 Circuit Board Locator Attenuators 0 7391 600 1 ...

Page 107: ...ance Section COMPONENT NUMBER EXAMPLE Component Number A23TR1234 Schematic Assembly T T Circuit Number Subassembly Number Number if used Chassis mounted components have no Assembly Number prefix see end of Replaceable Electrical Parts List ...

Page 108: ...IJIOOI U850 2 r 8 r t C 1 LS G NAL RELl Y K9 0 r I 4 4 TE T R5AD 3AC K FUSI C HEC I OVER OAD SENSE PROBE D TA TEST MULTI AT1 EN SHIFT DATA PLE XE R r CLOCK AND CS U 50 D o C EADEIACK A D C ONVE 1 TE R SDI DATA r SPIPATA SAMPLE HOLD ADDRESS SENESC HAL AC VS DA1 A Vg U OOO MAJTSTI Al JALOG a CONTROL i MINTST ___ s 5e1 VOLTAGE VARIABLE LJ ___ SYSTEM MODULES DAC A11 1 AL c AIN U D30 r ElllTTERY A1A 2 ...

Page 109: ... 00 0 0 00 0 0 0 00000 I2 0 0 1 33511 351 o D l ggl g 0000000000 00 0 00000000000 00 0 OOGOO OD 0 00 O II oo oo gP 00 U600 00 0 00 oo 0 00 00 0 00 oo D 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 00000000000 000000000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Figure 6 3 A1 Main Circuit Board Assembly 0 0 0 U801 0 0 U700 0 0 0 OJ80Cb 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 A1 Main circuit board...

Page 110: ...t al A1also shown on diagrams 2 3 and 4 SCHEM CIRCUIT LOCATION NUMBER 2E R831 4E R832 2C R833 1E R835 2C R840 3C R841 2E R842 4C R843 3C R935 4C R939 4E R940 4E R948 1B R1041 3B R1046 R1047 1G R1048 R1049 1B R1050 2B 3B U350 1G U840 U841A 1B U841B 2H U850 1H U850 U940 1B U945 1B 1B VR451 1B VR452 1B VR975 1A 1G SCHEM LOCATION 2G 1G 1G 2G 2F 4F 4F 2E 1G 4G 2F 2G 4E 3G 3G 3G 3G 3G 1B 1F 2G 2G 1B 3B ...

Page 111: ... 2 4 4 I e CHANNEL 1 A TiENUA TORS AT9SO l i9GO CH 1 CAL SIGrNAL D 7391 603 E 1041 lOOk F 1 s 9 i O to I F Ofv QI00 6 0 sv i U840 74HC4053 U940 M l4 so R 9 9 L96S 440h C H 1 OVE RLOA D SE N S TO Uq 0 14 Glt 045 FlJ9e C 4SC K TO uii o s 0 H I i j CAL F 3 5 l o I0_ 4 C ioVERL OA b SENS TO U9IO l 0 PARTIAL Al MAIN BOARD INPUT ATTENUATOF S ELAY DRIVERS f I 1 l J I ...

Page 112: ...ated on reverse side of 11A52 Block Diagram Static Sensitive Devices See Maintenance Section COMPONENT NUMBER EXAMPLE Component Number A23TR1234 i r Schematic Assembly _J L Circuit Number Subassembly Number Number if used Chassis mounted components have no Assembly Number prefix see end of Replaceable Electrical Parts List ...

Page 113: ...N NUMBER DS100 1G R100 DS101 1H R101 R102 J100 1G R103 SCHEM CIRCUIT SCHEM LOCATION NUMBER LOCATION 3A TP11B SF TP600 4A 2G TP601 3C TP602 3C 2G TP603 3C TP604 4B 3H TPGOS 4B 3H TP606 4C TP100S 2H SD 5D U600 4E 5D U630 4F 5D U660 2A 4G U700 3B 3B U750 2F 4G U800 4C 4G U801 4D 4A U841 3G 3A U910 2F 2E U1001 1G 2F U1005A 2F 3G U100SB 2F 3G U100SC 1C 3G U1005D 1C 3G 1G VR757 3F 3G VR759 3E 1G VR1001 ...

Page 114: ......

Page 115: ...11A52 Extended Service A1 Main circuit board illustration is located on reverse side of 11A52 Block Diagram ...

Page 116: ...LR210 1E R543 Partial A1also shown on diagrams 1 2 and 4 SCHEM CIRCUIT LOCATION NUMBER 28 R102 2B R103 2B R104 2B R105 2B R106 38 R107 R108 1A 1C U100 U101 1B U102 1B U103 SCHEM CIRCUIT LOCATION NUMBER 3C SCHEM CIRCUIT LOCATION NUMBER 2E R544 R545 40 R546 40 R547 40 R548 1G R549 1G R550 3G R551 2E R645 2E R647 3E R650 3E R651 40 R652 40 R653 3G R660 30 R661 30 R662 30 R663 30 40 U310 30 U335A 40 U...

Page 117: ...Z ___ _ _ _ _ _ _ _ _ _ ___ SA 1 550 l 551 3 ft OUT 1 1 le 2D MA J TST V y7 9i l Wr TO 0 1 2 5 I AlA1 SAMPLg HOLD ASSEMBLY YI 1 V3 14 I 5A FB OllT 21 tvf__ f_i _o_ rtT J A1 A 2 SAMPLE OLC ASSEIV 6LY I 0 1 IS B R441 V T lc ilNV Z 5 0 M 45 1 444 11 Sk l 10 z _ I 1 f i 2 1_ _____________ R4i43 f 32 1 Ok r 3 r T 24 27 J_ 1sB TYPE li B 5D US40 M377 3 U33S 7391 606 IS a 4 Cl 1 3 f LI 17 se sv 4 o V A ZP...

Page 118: ...11A52 Extended Service A1 Main circuit board illustration is located on reverse side of 11A52 Block Diagram ...

Page 119: ...E l240 50 C440 30 CR440 30 C630 50 R115 3E L115 2C CR131 40 l116 30 Partial A1also shown on diagrams 1 2 and 3 Static Sensitive Devices See Maintenance Section COMPONENT NUMBER EXAMPLE Component Number A23TR1234 Ass bl T Sc em tic em r J L Circuit Number Subassembly Number Number if used Chassis mounted components have no Assembly Number prefix see tmd of Replaceable Electrical Parts list ...

Page 120: ... CL OGI Z I DI C LOC K I St l l AT ZI V f l Ml P 115 Pl t fl TA MF r I 2 0 DI M P IOI I iD Wv 7 ZO 11 lc D TE CTOR I I l t I fc 41 l f 1 1 0 uF I 1 5A ttri 18 fl V POW5R I 11 GR341 11 11 0 JNO I ISV 15V _ I TO L 11 1 TO L l i I I I 15 IS I I o 14 14 i i V f OW S Fl I I TR1GoGER I tTRICS 0 1 14 13 Tl l GiER I I Gi Ot 10 l Z l Z a ROUND I I 0 Pl l Y 11 f Dl6P OISP II 0 ISPL I I 5 IV POWE 10 I 10 Gt ...

Page 121: ... _________section 7 Mechanical Parts ...

Page 122: ... ...

Page 123: ... colon Because of space limitations an Item Name may sometimes appear as incomplete For fur ther Item Name identification the U S Federal Cataloging Handbook H6 1 can be utilized where possible FIGURE AND INDEX NUMBERS Items in this section are referenced by figure and index numbers to the illustrations INDENTATION SYSTEM This mechanical parts list is indented to indicate item re lationships Follo...

Page 124: ...RLAND PA 17070 3007 DU PONT CONNECTOR SYSTEMS DIV MILITARY PRODUCTS GROUP 22599 AMERACE CORP 15201 BURBANK BLVD VAN NUYS CA 91411 3532 ESNA DIV SUITE C 80009 TEKTRONIX INC 14150 SW KARL BRAUN DR BEAVERTON OR 97707 0001 PO BOX 500 83385 MICRODOT MFG INC 3221 WBIG BEAVER RD TROY MI 48098 GREER CENTRAL DIV 91260 CONNOR SPRING AND MFG CO 1729 JUNCTION AVE SAN JOSE CA 95112 ASLOSS AND BRITTAN INC CO 93...

Page 125: ...DESCR END ATTACHING PARTS I 21 1 CIRCUIT BD ASSY FRONT PANEL SEE A2 REPL ATTACHING PARTS 22 211 0413 00 2 SCREW MACHINE 2 56 X0 375 FLH 82 DEG STL 939D7 ORDER BY DESCR END ATTACHING PARTS 23 174 0159 00 1 CA ASSY SP ELEC 6 26 AWG 3 0 L RIBBDN 80009 174 0159 00 24 334 3438 00 1 MARKER IDENT MARKED TURN OFF POWER 80009 334 3438 00 25 214 1061 00 1 CONTACT ELEC GROUNDING CU BE 80009 214 1061 00 26 42...

Page 126: ... 6114 01 070 6698 01 070 6786 00 Qty 12345 Hane Descriptim 4 SCREW TPG TR 6 32 X0 5 PNH STL END ATTACHING PARTS STANDARD ACCESSORIES 1 MD NUAL TECH USERS 11A52 1 PROCEDURE INCOMING INSPECTION 11A52 OPTIONAL ACCESSORIES MD NUAL TECH SERVICE REF 11A52 Mfr Code Mfr Part No 83385 ORDER BY DESCR 80009 070 6114 01 80009 070 6698 01 80009 070 6786 00 ...

Page 127: ... 11A52 Extended Service ...

Page 128: ......