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| TROUBLESHOOTING & REPAIR |
DC BUS POWER SUPPLY PC BOARD TEST(CONTINUED)
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6.Check the DC Bus Power Supply PC Board input and output voltages according to Table F.3. See Figure F.7 and the Wiring Diagram.
If plug P46 pin
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 Power Supply PC Board is operating prop- erly.
8.If any of the output voltages are not correct and the input voltage is correct, the DC Bus Power Supply PC Board may be faulty, or the supplied board may be bad.
9.If the input voltage is not correct, check the leads between the DC Bus Power Supply PC Board and the Power PC Board Rectifier. See the Wiring Diagram.
10.When finished testing, replace the case top.
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TABLE F.2 – 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 |
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| Power PC Board |
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| Rectifier |
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Plug P47 – Pin 7 | Plug P47 – Pin 6 | 38.0 | – 42.0 VDC | Supply to Power PC |
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| Board |
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Plug P47 – Pin 8 | Plug P47 – Pin 6 | 38.0 | – 42.0 VDC | Supply to Power PC |
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| Board |
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Plug P47 – Pin 4 | Plug P47 – Pin 2 | 38.0 | – 42.0 VDC | Supply to Feed Head PC |
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| Board |
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Plug P47 – Pin 3 | Plug P47 – Pin 1 | 38.0 | – 42.0 VDC | Supply to S1 Wire |
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| Feeder Receptacle |
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