Instruction manual

P83259 H
Sheet 24 of 26
19. TROUBLE SHOOTING:
Condition Check
1. Zone page or all call page cannot be
accessed
1. Telephone system must have touch tone (DTMF) dialing.
2. Check presence and polarity of voltage on (-) 24VDC and GND (+) terminals
on TB4.
3. Check for the access tone at the beginning of a page by using a telephone
connected between TB3 1 and TB3 2.
2. No background music. 1. Verify unit has released from last page.
2. Check background music source, and adjust its volume control, as desired.
3. Check presence of line level music input (if used) at terminals on TB1 of MZC-
144 group. Check for presence of music at terminals on TB2 of MZC-144 and
TB2 of MZEM-3 modules. If necessary also at speaker amplifier, or central or
zone amplifier inputs.
3. No sound or low page volume. 1. Check presence and level of audio input at Tip and Ring terminals on TB1 of
the MZC-144 and if necessary also at the CO Port.
2. Check presence and level of audio at the zone AUDIO output terminals on TB2
of the MZC-144 and TB1 of the MZEM-3 modules. If necessary also at
speaker amplifier inputs, and central or zone amplifier inputs.
4. The page alert tone is too high or
too low.
1. Set the page alert Tone Volume Control in the MZC-144 to the desired level.
5. Talk-Back does not function
properly.
1. Check for proper configuration of the zone's One Way/Talk-Back Select
Switch.
2. Adjust the Talk-Back Volume Control in the MZC-144.
6. Relay module not providing contact
closure.
1. Telephone system must have touch tone (DTMF) dialing.
2. Check presence and polarity of voltage on (-) 24VDC and GND (+) terminals
on TB4.
3. If the unit is in the Talk Battery configuration, check for the access tone at the
beginning of a page by using a telephone connected between TB3 1 and TB3 2.
4. Check background music source, and adjust its volume control, as desired.
5. Check for proper configuration of the MZC-RM feature selectors.