Hitachi RAC-09CHV1 - Thermistor and Reset Circuit Troubleshooting

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LD202 is blinking 7 times.
Thermistor unusual.
Thermistor is disconnected.
❈observe “left disconnection
after servicing”.
Connect thermistor.
Does thermistor works
correctly?
Exchange thermistor.
Does thermistor circuit
works correctly?
Exchange thermistor circuit
parts.
Confirm circuit pattern and
lead wiring following drawing
board and circuit.
LD202 is 1 time blinking.
Stop reset.
Does reset circuit works
correctly?
(Micro-computer pin # 26
has bout 5V output)
Exchange break-down parts.
Start again, does it works
correctly?
Make final checking of
machine works.
Reconfirm all the connector
are set firmly.
Ye s
No
No
No
No
Ye s