Hameg HM 303-4, Service Manual

Page 1: ...Instruments Oscilloscope HM 303 4 E N G L I S H 4S 0303 04E0 10 JUN 1998 SERVICE MANUAL HM303 4...

Page 2: ...10 XY Board Bottom side 11 Sync Amplifier 12 Time base 13 Sweep Generator 14 TB Board 15 CRT Board 16 CRT Board Top and Bottom side 17 Power Supply PS Board 18 PS Board Top side 19 PS Board Bottom si...

Page 3: ...Subject to change without notice 2...

Page 4: ...ge 100 240V AC 10 50 60Hz Power consumption approx 36 Watt at 50Hz Min Max ambient temperature 0 C 40 C Protective system Safety class I IEC 1010 1 Weight approx 5 6kg color techno brown Cabinet W 285...

Page 5: ...Subject to change without notice 4 Y Preamplifier CH I YP Board...

Page 6: ...Subject to change without notice 5 Y Preamplifier CH II YP Board...

Page 7: ...Subject to change without notice 6 Y Intermediate Amplifier and Trigger Amplifier YP Board...

Page 8: ...Subject to change without notice 7 YPA Board Top side...

Page 9: ...Subject to change without notice 8 YPA Board Top side...

Page 10: ...Subject to change without notice 9 XY Amplifier YF Amplifier OS Circuit...

Page 11: ...Subject to change without notice 10 XY Board Top side...

Page 12: ...Subject to change without notice 11 XY Board Top side...

Page 13: ...Subject to change without notice 12 Sync Amplifier...

Page 14: ...Subject to change without notice 13 Time base...

Page 15: ...Subject to change without notice 14 Sweep Generator...

Page 16: ...Subject to change without notice 15 TB Board...

Page 17: ...Subject to change without notice 16 CRT Board...

Page 18: ...Subject to change without notice 17 CRT Board Top and Bottom side...

Page 19: ...9R C1032 100u 16V R1053 619R 1 2 3 T1008 BC860 SOT 23 c 3 2 1 T1002 BD433 TO 126 C1042 1n 50V R1061 10K0 R1056 10K0 C1034 100u 16V R1054 3K01 3 2 1 IC1004A TL082CN R1055 511R R1043 7K50 C1045 0 1u 50V...

Page 20: ...Subject to change without notice 19 PS Board Top side...

Page 21: ...Subject to change without notice 20 PS Board Bottom side...

Page 22: ...Subject to change without notice 21 Component tester Calibrator...

Page 23: ...Subject to change without notice 22 CCT Board Top and Bottom side...

Page 24: ...Subject to change without notice 23 Front control board...

Page 25: ...Subject to change without notice 24 Front Control board Top and Bottomside...

Page 26: ...Subject to change without notice 25 Adjustment Procedure...

Page 27: ...1kHz squarewave output and 600 impedance risetime faster than 150ns Output voltage 2mV 20Volts in 1 2 5 sequence for 4 divisions display amplitude e g HZ62 TEK PG506 4 Time mark generator from 5ns div...

Page 28: ...Sweep start voltage 37 28 RV2225 X Magnification x1 37 29 RV2260 X Symmetry 37 30 RV3591 A 3589 C CV3511 B Time base 37 31 RV2234 X Magnification x10 39 32 R624 XY Gain 39 33 RV3293 Trigger Symmetry 3...

Page 29: ...Subject to change without notice 28 2 1 PS Board Front panel 6 7 YPA Board 4 5 Pin 2 Pin 4 PS Board 3 XY Board...

Page 30: ...isappears Release XY pushbutton 5 R1003 CRT maximum intensity Locate and identify R1003 5 on PS Board Set INTENS control to fully right position Set FOCUS knob on the front panel for optimum sharpness...

Page 31: ...Subject to change without notice 30 10 12 7 11 9 8 YPA Board PS Board...

Page 32: ...pushbuttons out for channel I mode Press Y x5 channel I in for 1mV div Press GD pushbutton channel I in Switch the attenuator channel I constantly between 5mV div 1mV and 10mV div 2mV Adjust R122 10...

Page 33: ...0Hz Squarewave 5mV div CH I Locate and identify R139 13 in CH I section of the YPA Board Connect a 25mV 100Hz squarewave signal via 50 cable and 50 through terminator to input channel I Set time base...

Page 34: ...channel II in Press Y x5 channel II in for 1mV div Using Y POS II control set trace to the horizontal center line Locate and identify R503 17 on YPA Board Adjust R503 17 so that the baseline will not...

Page 35: ...Subject to change without notice 34 A C D B 24 B D C A 23 YPA Board 21 A D B C...

Page 36: ...Repeat the adjustments under item 21 if the frequency reading on the generator shows a value less than 30MHz 23 C113 111 102 105 Attenuator Compensation CH I Locate and identify trimmers VC102 113 for...

Page 37: ...Subject to change without notice 36 25 YPA Board 27 B 30 A C B A 26 XY Board Pin 5 28 29 Pin 1 TB Board...

Page 38: ...2225 28 for 10 2 div sweep length 29 RV2260 X Symmetry Locate and identify RV2260 29 on XY Board Set the X POS knob to the mechanical center position Adjust RV2260 29 for a symmetrical trace position...

Page 39: ...Subject to change without notice 38 YPA Board 35 32 34 31 33 TB Board XY Board...

Page 40: ...shbutton in Turn LEVEL control for triggering center position Reduce signal height and correct LEVEL setting for just triggering with a minimum signal height Press and release the trigger SLOPE pushbu...

Page 41: ...Subject to change without notice 40 37 36B Pin 14 Pin 1 CT Board 36A XY Board...

Page 42: ...0 2ms div Now approximately 2 signal periods should be visible on the screen Press 1kHz 1MHz pushbutton in Set time base to 0 5 s position Check 1MHz calbrator signal Please note Neither the calibrat...

Page 43: ...iv display amplitude of video signal Set time base to 5ms div time base 1ms div frame triggering Set trigger coupling switch to TV Check that trigger starts with vertical sync pulses Now approx 2 5 fr...

Page 44: ...0 Telefax 49 0 6182 800 100 E mail sales hameg de service hameg de Printed in Germany Oscilloscopes Multimeters Counters Frequency Synthesizers Generators R and LC Meters Spectrum Analyzers Power Sup...