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User and Programming Manual - Rev H
California Instruments
P Series
May 2000
35
7.3.4 Connectors and Fuses Check up
Ensure all connectors are properly mated and there are no broken wires. Check fuse F1 on
the A2 assembly and fuse F2 on the A3 assembly. Replace with the same type fuse.
7.3.5 Power on Troubleshooting Using the LED’S
If no fuses were blown or if fuses were found blown but all the IGBT’s checked out good and
the fuses have been replaced, reconnect power to the unit.
WARNING: Do not touch any parts inside the unit during this test as they will be live
and dangerous. Always wear safety glasses.
7.3.6 No Output, No Front Panel LEDs
Is LED on P.F.C. unit lit? OK if flickering with no load on output. If not lit, check input fuse
and wiring on P.F.C. module. P.F.C. module is the one in the center. If LED is not lit and
power is available at the EMI filter, replace P.F.C. module.
If LED is lit, proceed to DC-DC converter. The DC-DC converter is on the left hand side when
looking at the front. Are LEDs lit on the DC to DC board?
YES
NO
If LEDs on the DC-DC board are lit
and front panel LEDs are not lit, the
problem is probably in the large
ribbon cable that runs between the
DC-DC and the AC converter.
Check fuses on the DC-DC converter board. There is a
3 AMP (F2) fuse and a 10 Amp (F1) fuse both located in
the center of the PC board. You will have to remove the
two screws at the bottom of the unit to remove the mod-
ule in order to replace the fuses.
TURN OFF THE UNIT AND WAIT 5 MINUTES
BEFORE REMOVING MODULE.
If fuses are blown and there are signs of burn marks on
the components, do not replace fuses and power up.
Replace DC-DC module.
7.3.7 No Output LEDs on Front are Lit
Plug unit in and switch on. Are all the LEDs lit on the DC-DC board? 3 amber LEDs (DS3,
DS4, DS5) - if one or more of these LEDs is not lit the trouble is on the DC-AC board. Unplug
the cable to the DC-AC module (after safely removing power). If all the LEDs are lit after power
up, replace the DC-AC module as it has a shorted gate drive and probably blown power tran-
sistors.