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
Summary of Contents for WFM 601A
Page 4: ......
Page 10: ...Table of Contents vi WFM 601A WFM 601E WFM 601M Service Manual ...
Page 16: ...Service Safety Summary xii WFM 601A WFM 601E WFM 601M Service Manual ...
Page 21: ......
Page 35: ...Specifications 1 14 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 36: ......
Page 44: ...Installation 2 8 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 54: ...Operating Information 2 18 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 55: ......
Page 64: ......
Page 91: ......
Page 120: ......
Page 169: ......
Page 172: ......
Page 270: ...Replaceable Electrical Parts 8 98 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 272: ...9 2 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 282: ......
Page 284: ......
Page 286: ......
Page 288: ......
Page 290: ......
Page 294: ......
Page 298: ...9 28 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 300: ......
Page 302: ......
Page 304: ......
Page 308: ......
Page 310: ......
Page 312: ......
Page 316: ...9 46 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 318: ......
Page 320: ......
Page 322: ......
Page 328: ...9 58 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 330: ......
Page 332: ......
Page 334: ......
Page 336: ......
Page 338: ......
Page 340: ......
Page 342: ......
Page 344: ......
Page 350: ...9 80 WFM 601A WFM 601E WFM 601M Service Manual ...
Page 352: ......
Page 354: ......
Page 367: ......
Page 368: ......