C

1. Intermixed with MC-3 system, VOX circuit on the MC-60/4 "chatters " or clips first/last word of communication.

Improper power supply (When MC-60/4’s are installed the PS-2420UL must be used).

2. No communication on a specific line.

Check for proper connection of :
Line 1 (red) - Terminal 4
Line 2 (green) - Terminal 3
Line 3 (yellow) - Terminal 6
Line 4 (orange) - Terminal 7
Power: 1 = +, 5 = Neg.
Paging: Terminal 2

Refer to MC-60/4 Instructions.

3. No Paging.

1. Check for proper connection of terminal #2. Voltage between 2 and 5 should be approx. 10V DC to trigger pretone and paging.

Refer to MC-60/4 Instructions.

2.Check for proper paging adapter (MC-60/4 requires either the MC-A/A adapter or the use of a PG-C series amplifier).

Refer to MC-A/A Instructions.

3. If a PG-C amplifier is used, check the settings of switches 7 and 8 (7 should be on, 8 should be off).

Refer to PG-C Instructions.

4. Some units on one run are completely "dead" while others are fine.

Check for proper connections of terminals 1 and 5 (1 is positive, 5 is negative). Also refer to questions #2 and #3.

Refer to MC-60/4 Instructions.

5. Feedback while paging.

Overhead speakers are located too close to the handset initiating the page. Either turn down the amplifier until the feedback goes away, or modify the units for local speaker cut-out.

Contact Aiphone Technical Support for modification information.

6. MC-60/4 system with the PG-C series amplifier, music and paging are fine but there is no page pre-tone at all.

The #6 dip switch on the PG-C series amplifier must be "on" for any pre-tone to be heard, refer to #7.

Refer to PG-C Instructions.

7. Music and paging are fine but paging pre-tone is too loud or too quiet.

Pre-tone volume is adjusted separately from paging /music volume. If the system includes a PG-C series amplifier, the pre-tone control is located with the Bass/ Treble controls. If the system is using an MC-A/A, the pre-tone control is on the bottom of the MC-A/A.

Refer to PG-C Instructions or MC-A/A Instructions.

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