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KX-MB771GR
12.3.6.4. CALL SERVICE 4
"CALL SERVICE 4" means that the FAN does not run or the running of the FAN cannot be detected normally.
The running of the FAN is detected by IC300-AC20 and W24pin. "CALL SERVICE 4" is displayed when it detects NG three times
continuously.
After repairing, copy three times.If "CALL SERVICE 4 " is displayed, check again.
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Troubleshooting
