Instruction manual

Procedure A

If the green AC LED is “OFF”, and all other LEDs are “OFF”, a power loss condition has occurred.

A power loss condition may be caused by:

1. Loss of AC input voltage and battery back-up voltage.

2. Faulty internal wiring between the power supply module (SAPS) and the ± DC IN (TB4) on

the PC board and batteries missing.

3. Faulty PC board.

4. Faulty Power Supply Module (SAPS)

Perform the following:

1. Check for 24 VDC at TB4 on the PC board. Check for battery installation.

2. If the 24VDC is present on TB4, replace the PC board.

NOTE: Mark all wires before removing components. When the trouble is repaired, and

before testing, replace all wires to the proper locations and replace all covers.

Procedure B

If the green AC LED is “ON”, yellow TROUBLE LED is “ON” and D26, BAT TRB LED is “ON”,

Battery Voltage is below 18.5 VDC or battery is missing. A battery trouble condition might be

caused by:

1. Battery charging section of PC board is inoperable.

2. Batteries are missing.

3. Batteries are defective.

4. Battery wiring is incorrect

Perform the following:

1. Check for 24VDC at ± BATTERY connection at TB4 on the PC board. If the voltage is below

18.5 VDC, battery-charging section of the motherboard is inoperable. Replace the

Motherboard.

2. Check battery compartment for the presence of batteries. If batteries are not installed, install

them.

3. Insure that batteries are properly wired.

4. If Steps 1 through 3 are satisfied replace batteries.

Procedure C

If the green AC LED is “OFF”, yellow TROUBLE LED is “ON”, and D27, AC TRB LED is “ON”, the

AC sensing circuit on connected to TB1 is not operating. An AC trouble condition might be

caused by:

1. AC input missing or low.

2. No AC voltage to the AC Monitor Circuit

3. Faulty internal wiring between the rectifier module and TB1 on the motherboard.

4. A faulty PC board.

Perform the following:

1. Check AC input.

2. Check fuse F2 on PC board.

3. Check AC wiring between the power supply module and TB1 on the PC board.

4. If voltage is present replace PC board.