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TROUBLESHOOTING & REPAIR
DC BUS BOARD TEST(CONTINUED)
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6.Check the DC Bus Board input and output voltages according to Table F.4. See Figure F.6 and the Wiring Diagram.
WARNING
ELECTRIC SHOCK can kill.
High voltage is present at the terminals of Capacitor C3 near where testing is to be done.
7.If all the voltages are correct, the DC Bus Board is operating properly.
8.If any of the output voltages are not correct and the input voltage is correct, the DC Bus Board may be faulty.
9.If the input voltage is not correct, check the leads between the DC Bus Board and the Bus Rectifier. See the Wiring Diagram.
10.When finished testing, replace the case wraparound cover.
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TABLE F.4 – DC BUS POWER SUPPLY PC BOARD VOLTAGE TABLE
Positive Meter Probe | Negative Meter Probe | Approximate Voltage | Conditions/Comments | ||
Test Point | Test Point | Reading |
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Plug P46 – Pin 1 | Plug P46 – Pin 3 | 65 | – 75 VDC | Should be same as the | |
Lead 65 | Lead 66 |
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| Bus Rectifier | |
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Plug P47 – Pin 8(+) | Plug P47 – Pin | 38.0 | – 42.0 VDC | Supply to the Wire | |
Lead 52 | Lead 51 |
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| Feeder Receptacle | |
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Plug P47 – Pin 3(+) | Plug P47 – Pin | 38.0 | – 42.0 VDC | Supply to Power Board | |
Lead 477 | Lead 475 | ||||
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