Panasonic DP-MB310EU - Page 190

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KX-MB2230EU/ KX-MB2270EU/ KX-MB2515EU/ KX-MB2545EU/ KX-MB2575EU/ DP-MB310EU
12.3.5.2. CALL SERVICE 2
"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-W26pin. (NHSYNC)
Note:
As for the "Pulse" waveform of the above flow chart, see the timing chart in LSU (Laser Scanning Unit) Section (P.75).