User Manual – Rev BE AMETEK Programmable Power
MX Series 237
7.4.5 Power-on Troubleshooting Using the LED’s.
WARNING: Do not touch any parts inside the unit during this test as they
will be live and dangerous. Always wear safety glasses.
If the three input fuses are OK, then reconnect the main AC input power to the
cabinet.
LV Supply (P/N 7003-702):
Turn the main breaker on and check green LED DS2 and DS3 on the system
interface board. Both LEDs should be lit indicating the +/-19Vdc and +/-15Vdc
supplies are OK.
If one or both LEDs are not lit, then there is something wrong with the LV power
supply and it will have to be serviced.
Oscillator (Front Panel):
If LV supply appears good, then program 150Vac on the low range and connect
a DMM to TP2 (phase A) on the system interface board with the low side of the
meter connected to TP1. There should be a 2 to 3 volt rms signal present on
TP2. Check TP3 (phase B) for the same signal. Check TP4 (phase C) for the
same signal.
AC power module (P/N 7003-402-1):
If the oscillator drive signals are present on the system interface board, connect
the DMM to brass terminals 5 & 6 located near the bottom of the power module.
Program 100 Volts.
There should be about 100Vac between terminals 5 and 6. If no voltage at all is
measured it is possible that the AC power stage inside the module has failed
and it will be necessary to remove the power module from the chassis for closer
inspection.
WARNING: Wait 10 minutes for all internal capacitors to discharge.
To remove the power module, proceed as follows:
1) Disconnect the 7 wires going to the brass terminals on the
lower front panel of the module. Label the wires so they can be
reinstalled correctly later.
2) Remove screws securing the upper and lower straps holding
the module in the chassis slot.
3) Remove the 50-pin ribbon connector at J50A, B or C.
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