56 Sync Control System
Handset Interface PCB (Part No. 57-300183-000)
(1) AUDIO IN/OUT (2) HOOK SWITCH (3) TERM 1 HANDSET
SPEAKER
(4) TERM 2 HANDSET SPEAKER (5) TERM 3 MICROPHONE (6) TERM 4 MICROPHONE
(7) VOLUME CENTER
Beep Speaker to Intercom Cable Assembly (Part No. 57-300488-000)
(1) TO J1 ON INTERCOM ASSEMBLY (2) BEEPER (3) DATA OUT
57-300184-000
(4) GROUND (5) CONTROL (6) DATA IN
(7) TO J3 ON BEEP SPEAKER
ASSEMBLY 57-300400-000
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