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CHECKING THE GATE PULSES
If circuit board AP02 or AP03 has failed, the gate pulses must always be checked. Remove
connections XS04 and XS05 (gate pulses), and connect a gate load to connections E01 and
E02 and to F01 and F02.
Gate load
IMPORTANT: never check the gate pulses when AP02 and AP03 are connected:
always use a dummy gate load.
The gate pulse minimum level must be - - 2 to - - 4 V, and the maximum level 13.5 to 16.5 V.
Frequency must be 36.5 kHz
voltage level of +5 V, is 41%
If the gate pulses are not within these tolerances, AP01 must be replaced.
After replacing AP01, the machine must be soft- -started, as described on page 25.
Gate pulses as measured across the dummy gate load on circuit board AP01 between
connections F01 and F02.
cmha2de1
0.5 kHz. Check that the maximum pulse time, measured at a
±
1.5% of the cycle time.
±
- - 19 - -
cmha2p25
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