General Maintenance
WVR610A & WVR611A Waveform Rasterizers Service Manual
6- 15
Check the Audio supplies on the Audio Board as shown in Table 6--8, (if an
Audio Board is installed). The test points are available, with the board installed,
at the location specified in Figure 8--3 on page 8--3.
Table 6- 8: Audio secondary supplies
Supply Name
Range
Measured at
Notes
5VD
4.6 to 5.4
TP902
3.3VD
3.2 to 3.6
TP806
2.5VD
2.3 to 2.7
TP804
1.6V
1.5 to 1.7
TP801
6VA
5.9 to 6.9
TP805
--5VA2
--4.5 to –5.5
TP200
Not present in analog only version Opt AN
5VA2
4.8 to 5.2
TP802
Not present in analog only version Opt AN
--5VA
--4.5 to --5.5
TP800
Not present in digital only version Opt DG
5VA
4.8 to 5.2
TP900
Not present in digital only version Opt DG
--15V
--14.5 to 15.5
TP803
Not present in digital only version Opt DG
+15V
14.5 to 15.5
TP901
Not present in digital only version Opt DG
If the instrument has a reasonable display on the screen, but the front panel does
not work, follow this procedure:
1.
Do the LEDs turn on for 2 to 3 seconds at power up? If not, check the 5 V
fuse, F580, on the main board and check the cable from the main board to
the front panel. If there is power to the front panel and the LEDs do not turn
on at power up, then replace the front panel board.
2.
After power up, do most of the LEDs turn on and stay on? If not, proceed to
step 3. Otherwise probe J390, pin 6 and pin 7 on the main board. Pin 6
should be TTL high (about 3.3 V) and pin 7 should be low (RS232 level,
about –7 V). If not, suspect the main board. Otherwise probe pin 6 and 7 of
J670 on the front panel board. If they are high and low, respectively, suspect
the front panel, otherwise replace the cable.
3.
When you press buttons on the front panel, do LEDs DS971 and DS972 on
the main board flash? These LEDs monitor the transmit and receive lines on
the main board side of the RS232 transceiver. If they flash, then go to step 5.
4.
If DS971 is not flashing, then check pin 3 of J390 on the main board. When
you press a key, you should see pulses about a 15 V high and 100 to 300
µ
s
long. If not, suspect the front panel board.
5.
If pin 3 of J390 is toggling and DS971 is not, then the RS232 receiver on the
main board is not working. Replace the main board.
Front Panel
Troubleshooting
Summary of Contents for WVR610A
Page 4: ......
Page 14: ...Table of Contents x WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 18: ...Service Safety Summary xiv WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 22: ...Preface xviii WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 23: ...Specifications...
Page 24: ......
Page 53: ...Operating Information...
Page 54: ......
Page 90: ...Operating Basics 2 36 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 132: ...Changing Instrument Settings 2 78 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 139: ...Theory of Operation...
Page 140: ......
Page 147: ...Performance Verification...
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Page 201: ...Adjustment Procedures...
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Page 204: ...Adjustments 5 2 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 205: ...Maintenance...
Page 206: ......
Page 228: ...Repackaging Instructions 6 22 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 229: ...Options...
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Page 234: ...Options and Accessories 7 4 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 235: ...Diagrams...
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Page 243: ...Replaceable Electrical Parts...
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Page 246: ...Electrical Parts List 9 2 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 247: ...Replaceable Mechanical Parts...
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