VL-GD001RU - Panasonic Video Monitoring Service Manual (repair manual). Page 17

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6.4. Receiving the Call Button on the Doorphone
(A) When the doorphone Call button is pressed, the bell can not be heard through the handset;
Note:
(*1) Refer to Check IC2 (P.20)
0 V
0 V
5 V
Short P1 and P2.
TPB
(Q1 Base)
TPC
(Q1 Collector)
Pin 20 of IC2
<Fig. 102>
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