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This is a very good quality print (scan) of the original SONY service manual. The original from Sony is on very thin paper. Nevertheless it is very clear and sharp and excellent readable. I'm very satisfied to have now this rare document. I've looking for it many years (infrequent). It contains very detailed circuit diagrams, exploded views, part lists, PCB view with good readable connection lines. Very recommended.
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Text excerpt from page 23 (click to view)
WASH HEATER TROUBLE
When checking the voltage betweenthe connector during whites washing. is voltage 220-240V~?
(1)
NO
Replace the MAIN PWB ASSEMBLY
YES
AC 220-240V
YELLOW RED
After power off,is the resistance of wire (RED-YELLOW) connectors between 10 ~30 ?
123
YES
Normal
NO
After power offis thethe heater terminal is disconnected, and resistance 10~30 ?
NO
Replace the HEATER ASSEMBLY
HEATING CONTINUOUSLY ABOVE THE SETTING WATER TEMPERATURE
When pressing Water Temp. during, is the displayed temperature is over 10ûC higher than the selected temp?
Temp.
NO
Check if inlet hose is connected to a hot faucet ; otherwise, replace PWB ASSEMBLY(Main)
YES
Is the resistance between Thermistor Comectors 2.5k½~180k½?
NO
Replace Thermister
YES
When checking THERMISTOR on the tub is the THERMISTOR loosened above 2mm from the rubber?