-- 1 9 --cmha2de1
CHECKING THE GATE P ULSES
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 dumm y gat e 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 k Hz ±0.5 kHz. Check that the maximum pulse time, measured at a
voltage level of +5 V, is 41% ±1.5% of the cycle time.
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.
cmha2p25
Gate pulses as measured across the dummy gate load on circuit board AP01 between
connections F0 1 and F02.
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