Panasonic DP-MB310EU - Page 192

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KX-MB2230EU/ KX-MB2270EU/ KX-MB2515EU/ KX-MB2545EU/ KX-MB2575EU/ DP-MB310EU
12.3.5.4. 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-AE23 and AB26pin. "CALL SERVICE 4" is displayed when it detects NG.
After repairing, copy. If “CALL SERVICE 4 “ is displayed, check again.