Ramsey Electronics UAM4SYS, Assembly And Instruction Manual

Page 1: ...wer stage mute is provided All this in a rugged compact aluminum case UNIVERSAL AUDIO AMPLIFIER SYSTEM FEATURES 42 watt class D amplifier 21W per channel stereo mode 0 1 N distortion Balanced or unbal...

Page 2: ...ier kit RAMSEY AMATEUR RADIO KITS HR Series HF All Mode Receivers DDF1 Doppler Direction Finder Kit QRP Series HF CW Transmitters CW7C CW Keyer QRP Power Amplifiers RAMSEY MINI KITS Many other kits ar...

Page 3: ...earn As You Build Kit Assembly 11 Parts List 13 Assembly Steps 14 Setup and Testing 24 Specifications 36 Schematics 38 41 Parts Layout Diagram 42 Ramsey Kit Warranty 43 KIT ASSEMBLY AND INSTRUCTION MA...

Page 4: ...ower is applied to the power amp IC U7 on schematic page 4 It is also applied to R29 through J6 pin 10 to J40 pin 1 on the front panel schematic sheet 3 This causes D4 the power indicator LED to light...

Page 5: ...pin 7 Ground comes in on the sleeve and is connected to the circuit board ground plane A little information about balanced signals is probably a good idea at this time Balanced audio signals use three...

Page 6: ...ppropriate levels of each function Because DC levels are used to control the various functions the scratchy noise produced by the controls in many audio components is not a problem in the UAM4SYS C15...

Page 7: ...ins 1 and 2 to close At the same time U5 pin 7 is at 0V This applies 0V to U6 pin 5 which causes the switch between U6 pin 3 and 4 to open This turns off the Loudness function as mentioned above When...

Page 8: ...emembers where it is set even when the power is removed So if you turn off the UAM4SYS and then turn it back on the headphone level will be where you left it Also notice that the signal to the headpho...

Page 9: ...is method but it also has a special method called Spread Spectrum Modulation SSM With this method the switching frequency is actually changed around a center frequency in this case 4 around 200kHz Usi...

Page 10: ...ntrols the output of the speaker output It will not have any effect on the headphone or line outputs of the UAM4 The UAM4SYS may be operated as either a 2 channel 21 watt per channel or a single 42 wa...

Page 11: ...d strategy for the order of the following kit assembly steps First we install parts in physical relationship to each other so there s minimal chance of inserting wires into wrong holes Second whenever...

Page 12: ...PC traces that will connect to the part Once this is accomplished the part can be installed by holding it with tweezers in contact with the tinned trace and re heating the solder see the following di...

Page 13: ...C33 34 1 1000uF 25Volt Electrolytic marked 1000uF 25V C1 4 47uF Tantalum SMT marked 476 C48 50 60 62 Preinstalled 1 0 01uF Ceramic 0805 SMT not marked C53 Preinstalled 4 0 1uF Ceramic 0805 SMT not mar...

Page 14: ...We will begin with the main board oriented in the direction shown Be sure not to confuse the side of the board where the parts go On the board you will see the side that has white silk screen parts lo...

Page 15: ...any attempt to reposition it will result in failure of the adhesive so make sure the fingers are all facing the same direction BEFORE pressing into place It is best to clean the case bottom with dena...

Page 16: ...rs they have no polarity so they can be installed in either direction 9 Install C12 a 10uF electrolytic capacitor marked 10uF This is the first electrolytic capacitor you are about to install Pay clos...

Page 17: ...lytic capacitor marked 10uF 11 Install C30 the last 10uF electrolytic capacitor in this section marked 10uF 12 Install J8 an RCA jack Make sure this jack is flush and square before soldering 13 Instal...

Page 18: ...24 15 Install C16 a 10uF electrolytic capacitor marked 10uF Remember to check polarity 16 Install C4 another 10uF electrolytic capacitor marked 10uF 17 Install C22 you guessed it another 10uF electrol...

Page 19: ...d Red Red 4 Install U5 a 74HC109 dual JK flip flop IC marked 74HC109 Install this IC like you did U1 U3 and U10 5 Install C24 a 0 1uF ceramic capacitor marked 104 6 Install C23 a 0 22uF ceramic capaci...

Page 20: ...C28 6 Install C40 the last 0 1uF ceramic capacitor marked 104 7 Install C39 a 10uF electrolytic capacitor marked 10uF Polarity 8 Install C29 finally the last 10uF electrolytic capacitor marked 10uF 9...

Page 21: ...button switch 3 Install S5 a third SPST momentary push button switch 4 Install S6 the last SPST momentary push button switch 5 Install R18 a 10K ohm potentiometer Make sure this part is flush and squ...

Page 22: ...ont panel circuit board and main board together Slide the main board between the two rows of long pins on J40 and J7 on the front panel circuit board so that J6 and J9 respectively on the main board a...

Page 23: ...ll penetrating the front panel equally It is up to you how far you wish them to stick out Solder one lead on each LED Make sure you are happy with their alignment and then solder the other lead of eac...

Page 24: ...igator clip leads 10uF electrolytic capacitor JUMPER SETTINGS 1 Set the jumpers on headers H1 REC LEFT and H2 REC RIGHT If you wish the LINE OUT audio jacks J1 and J8 to be the same as the input audio...

Page 25: ...Balanced audio two 3 5mm stereo plugs required for stereo Connect the left channel plug to J3 Connect the right channel plug to J2 If you are making your own cables refer to the information below for...

Page 26: ...of the following steps fail to produce the indicated result please refer to the troubleshooting section of this manual Power Supply Note in the following steps all VOLTAGE measurements are take with t...

Page 27: ...the other clip connect the lead of the extra 10uf electrolytic capacitor The positive end of the capacitor will be used as a test probe for testing and troubleshooting Line Output Buffer Connect the...

Page 28: ...u will see two slots on either side at the bottom of the tray The cover simply slides into these slots Push it as far as it will go on to the tray 3 Now install the back panel and bezel assembly using...

Page 29: ...the circuit board between J5 and the connection to S1 Problem No 10 Volts out of VR1 Checks 1 First perform the No 12 to 18 Volts Input procedure Once the input voltage is verified to be good go to st...

Page 30: ...d observe if the reading increases and decreases If it does NOT change check all connections on U10 for opens or shorts and also measure the voltage on pins 1 and 8 on U10 If you do not measure 5VDC t...

Page 31: ...correctly 4 Measure the voltage on U1 pins 3 and 5 READING 5VDC 0 02 VDC If good go to step 5 If the reading is not correct check for component placement and shorts on the connections around R1 R11 R1...

Page 32: ...ou may want to contact our technical support department Problem Bass control only not functioning properly Checks 1 Measure the voltage on U3 pin 17 READING 5 4VDC If correct go to step 2 otherwise go...

Page 33: ...board not at the circuit board of R19 READING 5 4VDC If not correct go to step 3 otherwise re solder the connection on R19 3 While adjusting R19 measure the voltage on the center connection of R19 RE...

Page 34: ...l button to turn on the loudness LED adjust the volume control to mid position and measure the voltage on U3 pin 7 READING approx 3VDC 0 2VDC This reading will change with the setting of the volume co...

Page 35: ...pens or shorts and proper installation and values Note that pins 7 9 and 3 13 MUST be the same voltage 6 Measure the voltage at U5 pins 7 9 and or 3 13 READING 5VDC or 0VDC If the reading is 5VDC and...

Page 36: ...3 3A max 18VDC Connector 2 1mm center positive rear panel Audio Outputs left right Line Outputs Buffered Selectable direct input or processed by main audio controls Connector 2 x RCA jacks rear panel...

Page 37: ...onnectors Impedance Greater than 10K ohms balanced or unbalanced Each channel Gain Selectable 22dB 25dB 29 5dB 36dB Distortion O 1 THD N Modulation Scheme Spread spectrum SSM Clock frequency 200kHz 4k...

Page 38: ...UAM4SYS 38 RIGHT LINE OUT LEFT LINE OUT REC RIGHT REC LEFT Schematic Sheet 1 4 Input Processing...

Page 39: ...UAM4SYS 39 Schematic Sheet 2 4 Control and Headphone Amps...

Page 40: ...UAM4SYS 40 4 3 RED UAM4SYS_Rev3_4 4 sheets SCH Schematic Sheet 3 4 Front Panel...

Page 41: ...UAM4SYS 41 Schematic Sheet 4 4 Power Amp Parts high lighted in grey Pre Installed not shown on Parts layout...

Page 42: ...UAM4SYS 42 Parts Layout...

Page 43: ...factory for a full refund less shipping The return package should be packed securely Insurance and tracking is highly recommended A reminder this applies to unassembled kits They must be in the same n...

Page 44: ...M4SYS Assembly and Instruction manual for RAMSEY MODEL NO UAM4SYS UNIVERSAL AUDIO AMP SYSTEM RAMSEY ELECTRONICS LLC 590 Fishers Station Drive Victor New York 14564 Phone 585 924 4560 Fax 585 924 4555...