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Amplifier tests
1. Transformer test
Necessary tools: voltmeter (AC), ohmmeter
1. Make sure that you are using proper
voltage for testing transformer
2. Disconnect power amp board from
transformer
3. Connect power cable, turn on the power
switch
4. Measure AC voltage between red cables
and black cable. Voltage values should
be 102V between red cables and 51V
between black cable and each of red
cables. Next measure AC voltage on
white 3 pin connector. Voltage values
should be 36V between green cables
and 18V between black cable and each
of green cables.
5. If there is no voltage at all, check with
ohmmeter if fuse is ok. If new fuse
immediately burns after switching on the
power then transformer is damaged and
need to be exchange. Also check if power
switch is working properly and if there is
good connection between power
connector and transformer. To do this
you have to remove plastic isolation of
switch and power connector. Also make
sure that soft start board is working
properly and relay is switching on 1-2
seconds after power is on. If all is ok then
transformer need to be exchange.
6. If measured voltages are different than
given values (tolerance is ±10%) or one
of measured voltages is equal zero then
also transformer need to be exchange.
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