HP 437B - SERVICE SHEET A4 C TROUBLESHOOTING

HP 437B
Service Sheet BDI
19. Set the oscilloscope as follows:
Vertical Sensitivity 0.0.0.0... ccc cece cence cece cece 1V/div
SWECD hi isAiseeihioaick anied he's ada Kalin cidted baer aeelneee’ 10 ms/div
Coupling: seve. siecieed sae cedeala cits ieee da aa dies DC
TTB RETIN G sss i schndie na teen neh Hee Dearieder Heeee External, +1
Connect the oscilloscope’s external trigger input to A4U13 pin 16.
20. Connect the oscilloscope to A4TP18. Verify the signal shown in Figure
8-10. -
10 ms/DIV
Figure 8-10. A41TP18 ADC Input Waveform
21. Connect the oscilloscope to A4TP13. Verify the signal shown in Figure
8-11.
5 ms/DIV
Figure 8-11. A4TP13 ADC Ramp Waveform
22. Connect the oscilloscope to A4TP14. Verify the signal shown in Figure
8-12.
SERVICE 8-37