GAI-Tronics 12580-001 Audio Distribution Module - Manual (Page 13)

Pub. 42004-600L2C
Model 12580-001 Amplifier Distribution/Monitor Module Page: 13 of 17
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Speaker Loop Return Lines
Terminate the central amplifier speaker loops to be monitored by the ADM on connectors TB3, TB6,
TB9, TB12, TB15, and TB18. Typically, this connection is made to the last speaker on the circuit so
that the entire loop is monitored. These connections are not polarity-sensitive.
N OTE : The conductors terminated on TB3, TB6, TB9, TB12, TB15, and TB18 should be twisted pairs.
Table 9. Circuit Relationships
Function →
Ckt. No. ↓ Central Amplifier
Audio Distribution
Speaker Loop
Interfaces
Ground Fault
Detection Control
Central Amplifier
Failure Contact
1
TB2-1 (AMP1 L1)
TB2-2 (AMP1 L2)
TB3 (SPKR 1) J4 (GF1) TB1 (CCIN1)
2
TB5-1 (AMP2 L1)
TB5-2 (AMP2 L2)
TB6 (SPKR 2) J5 (GF2) TB4 (CCIN2)
3
TB8-1 (AMP3 L1)
TB8-2 (AMP3 L2)
TB9 (SPKR 3) J6 (GF3) TB7 (CCIN3)
4
TB11-1 (AMP4 L1)
TB11-2 (AMP4 L2)
TB12 (SPKR 4) J7 (GF4) TB10 (CCIN4)
5
TB14-1 (AMP5 L1)
TB14-2 (AMP5 L2)
TB15 (SPKR 5) J8 (GF5) TB13 (CCIN5)
6
TB17-1 (AMP6 L1)
TB17-2 (AMP6 L2)
TB18 (SPKR 6) J9 (GF6) TB16 (CCIN6)
Table 9 shows the relationship between the connectors and headers for each of the six circuits the ADM
supports. It includes the component’s designation and the label printed on the Distribution/Monitor
PCBA, where applicable.
For example: audio for circuit 1’s amplifier input is passed from the AZI PCBA to terminal block TB2
(labeled AMP1
L1 and AMP1 L2). The speaker loop return line for this circuit is via TB3 (labeled
SPKR 1) and it includes ground fault detection control via header J4 (labeled GF1). The related contact
closure input is via TB1
(labeled CCIN1).
After all terminations have been made, apply power to the equipment, and adjust reference level R88 and
tone level R75 as described in the “Maintenance” section.