60
Service Manual Combics
Display blank
If the display is blank, the power supply to the
device or display may have been interrupted.
t Disconnect the device from the power, open it
and pull the plugs from the components.
t Then connect the device to the power via an
insulating transformer and then reconnect all
components in succession and measure the
supply voltages.
– The voltage at the output of the power supply
(plug A) and at the input of the main digital
PCB (plug B) is 15V ± 0.8V direct voltage.
Remove the protective cover from the power
supply PCB beforehand for measuring.
To do this, insert a regular screwdriver into
the four openings of the protective cover and
carefully press the clips located at the bottom
to the side.
Replacing the Power Supply PCB
– Remove the protective cover and the two
cables (blue/brown) of the power cable.
– Remove plug A, remove 2 screws and replace
the power supply. After replacement: do
not forget to reinsert the ground cable and
reinstall the protective cover.
A
B
Repairs | Component Replacement | Power Supply PCB
ST2
ST3
ST2
ST3
ST3
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