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117

KX-MB1500UCW/KX-MB1520UCB

"CALL SERVICE 2" means that the synchronous signal out of the LSU cannot be detected.
The synchronous signal out of the LSU is detected by IC 300-G23pin. (NHSYNC)

As for the "Pulse" waveform of the above flow chart, see the timing chart.

118

KX-MB1500UCW/KX-MB1520UCB

"CALL SERVICE 3" means that the temperature of the fuser does not rise up to or exceed a constant temperature.
The temperature is monitored with the thermistor inside the fuser and detected with the voltage input into IC 300-D19.

* When Call Service 3 is occurred, the cause can be distinguished by service mode  655.
Refer to CALL SERVICE Troubleshooting Guide (P.115) for details.

119

KX-MB1500UCW/KX-MB1520UCB

"CALL SERVICE 4" means that the FAN does not rotate or the rotation of the FAN cannot be detected normally.

120

KX-MB1500UCW/KX-MB1520UCB

“CALL SERVICE 17” means that the First use sensor problem.
Especially "CALL SERVICE 17" is appeared when the fuse which is installed in the Drum Unit PCB is not blown out within a specific
time.