Maintenance
WFM 601A, WFM 601E, & WFM 601M Service Manual
6–31
7. 5.2 V Buck Circuit
a. When the circuit is running correctly, measure the parameters listed in
Table 6–6.
Table 6–6: Shut down logic levels
Circuit location
Approximate voltage
U10, pin 6
100 kHz square
U10, pin 4
100 kHz ramp
TP5
–5.2 V
U10, pin 5
–11 V
U11, pin 2
0 V
DC
Troubleshooting the High Volts Supply.
To troubleshoot the high voltage circuits
on the Power Supply board, follow these steps:
WARNING.
Dangerous potentials exist on this circuit board. Use extreme care
when troubleshooting these circuits.
1. Preliminary Checks
a. Table 6–7 lists the High Volts Supply fault symptoms and procedures.
Determine which symptom the power supply exhibits and refer to the
corresponding procedure(s).
Table 6–7: High volts supply fault symptoms
Symptom
Procedure
Unable to focus CRT using the front-panel
control
Focus Amplifier Check
Unable to adjust CRT intensity using the
front-panel control
Z-Axis Amplifier Check
Grid Drive Check
No CRT display
High Voltage Oscillator Check
CRT Voltage Check
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