Maintenance
WFM 601A, WFM 601E, & WFM 601M Service Manual
6–33
6. CRT Voltage Check
NOTE
. This check requires a high-voltage probe having an input resistance of
1 G
W
or more.
a. Connect the high-voltage probe ground to TP1.
b. Use the high-voltage probe to measure the voltage at the cathode of VR5.
It should be approximately –2530 V.
c.
Measure the voltage at the anode end of CR6. It should be 50 to 150 V
more negative than the reading from the cathode of VR5.
The DAC and Component boards are located within the frame of the waveform
monitor, which makes them difficult to troubleshoot. Refer to Figure 6–21 on
page 6–25 for their location. By removing the boards, positioning them correctly,
and reconnecting the cables, you can troubleshoot both boards in their operating
configuration. You will need the Extender Cable described in the Options and
Accessories list located on page 7–1.
Shield
Serial
board
Component board
Holes for the
standard cables
Insulator
(cardboard)
DAC board
Standard
cable
Figure 6–23: Configuration to troubleshoot the DAC board
Configuring the DAC and
Component Boards for
Troubleshooting
Summary of Contents for WFM 601A
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