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B300-PRO
TROUBLESHOOTING & REPAIR
TEST PROCEDURE
1. Turn main power OFF.
2. Perform Input Filter Capacitor Dis-charge proce-
dure detailed in Mainten-ance section..
3. Connect a shorting conductor across terminals 14
and 53 of Protection Board.
4. Set an ohmmeter to X1000 range and place probes
on terminals 9 (+) and 12 (-) of one Switch Board.
The meter will show the Capacitors charging up
and may take a minute or so to stabilize. The final
meter reading should not exceed 8600 ohms (8.6
on the scale).
5. Test the other Switch Board the same way.
NOTE: Repeat the Input Filter Capacitor Dis-charge
procedure.
6. Remove the shorting conductor set up in step 3.
7. Install 5-amp fuses in the input supply fuse holders.
NOTE: These fuses should be installed to protect
against excessive current flow caused by a short
circuit during the procedure.
8. Turn on the machine.
9. With the output free of a load, check the open cir-
cuit voltages of the output.
10. Connect the machine for 440- or 575-volt opera-
tion.
11.With the output free of a load, check open circuit
voltages of the output. Voltage should be 70 VDC.
12. Remove the 5-amp fuse from the input supply fuse
holders.
13. Install 20-amp fuses and test under load.
NOTE: A resistive-type grid load bank is recom-
mended.
14. Perform Retest After Repair.
F-58 F-58
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TEST AFTER SWITCH BOARD OR CAPACITOR REPLACEMENT (cont.)
FIGURE F.30 - PLACEMENT OF SHORTING JUMPER