HP 8114A - Width Generator; Check for the Supply Voltages; Check the Current Sources for the Width Generator; Edge Interface

HP 8114A Service Guide
‘able 5-7. Voltage at Pin 8 of U504C
100 ns -5.07 v
999 ns
-467 mV
2. Check for the following voltage drops across R502:
able 5-8. Voltage Drops Across R502
100 ns
234 mV
999 ns 21 mV
Width Generator
Check for the supply voltages:
U602 pin 2 for -12 V, and U602 pin 3 for -5.2 V.
Check the current sources for the width generator:
1. Varying the width from 10.0 ns to 99.9 ns the voltage at pin 7 of
U504B should vary from -5.2 V to -0.5 V.
2. Check for the following voltage drops across R602:
mble 5-9. Voltage Drops Across R602
Edge Interface
1. Set standard setting, by pressing ISHIFT), (STORE) (Recall), (TJ.
2. Check at U702 pin 13 for an ECL signal (high level at -0.8 V, low
level at -1.8 V) with 15 96 duty cycle.
5-14 Troubleshooting