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W A R N I N G
Troubleshooting
To check the power supply voltages
To check the power supply voltages
Refer to chapter 6, "Replacing Assemblies," for instructions to remove or replace covers and assemblies.
Hazard voltages exist on the power supply, the CRT, and the CRT driver board. This procedure is to be performed by
1Turn off the instrument, disconnect the power cord, then remove the top cover.
2Apply power to the instrument.
3Using a DVM, measure the power supply voltages.
4Note problems with the power supply, then return to the power supply flowchart.
Power Supply Voltages
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| 5 volt | +5 V | |||||||||||||||||||||||||||||||
6 |
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| +5 volt remote sense | +5 V | ||||||||||||||||||||||||||||||
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| +3.5 volt | +3.5 V | |||||||||||||||||||||||||||||||
10 |
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| +3.5 volt remote sense | +3.5 V | ||||||||||||||||||||||||||||||
11 |
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| +12 volt | +12 V | ||||||||||||||||||||||||||||||
12 |
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| −12 volt | −12 V | ||||||||||||||||||||||||||||||
13 |
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| Not connected |
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| Ground | 0 V | |||||||||||||||||||||||||||||||||
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| Pin | Supply/Signal | Voltage | |
| 21 | Ground sense | 0 V | |
| 22 | Power valid | +5 V | |
| 23 | −3.25 volt remote sense | −3.25 V | |
| −3.25 volt | −3.25 V | ||
| 31 | −5.2 volt current limit | +2.5 V | |
| 32 | −5.2 volt remote sense | −5.2 V | |
| −5.2 volt | −5.2 V | ||
| 38 | Remote on/off | +12 V | |
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