Chapter 7 - Troubleshooting; Section 7-1 - Introduction; Section 7-2 - Troubleshooting - Wheelock SAFEPATH4 Application, Installation, Operation, And Maintenance Manual

Chapter 7 - Troubleshooting

Section 7-1 - Introduction

WARNING: SOME ELECTRONIC COMPONENTS STORE A HIGH VOLTAGE CHARGE,
EVEN THOUGH POWER IS NOT CONNECTED, AND CAN CAUSE A DANGEROUS SHOCK
IF TOUCHED. DO NOT TOUCH EXPOSED CIRCUITRY ON THE SAFEPATH4 AUDIO
BOOSTER PANEL UNLESS THE CIRCUITRY HAS DISCHARGED FOR ONE HOUR AND A
SAFE DISCHARGE PROCEDURE IS USED.
WARNING: PROVIDE UL REQUIRED ALTERNATIVE SIGNALING MEANS DURING
TROUBLE CONDITIONS AND SERVICING TO ASSURE ADEQUATE PROTECTION OF
PEOPLE AND PROPERTY.
REPLACE ANY MODULES THAT HAVE MALFUNCTIONED.
CAUTION: Only qualified personnel in accordance with the procedures in this manual should
conduct troubleshooting and servicing. Do not attempt to make other adjustments, modifications,
or repairs. Never use water, steam, cleaning liquids or sprays on the panel.
CAUTION: User servicing of the panel is limited to field-wiring changes, PC board
replacement, and following the instructions in Chapter 3 and procedures in this chapter of this
manual.
AFTER ANY TROUBLESHOOTING PROCEDURE IS COMPLETED, PERFORM A COMPLETE
SYSTEM CHECKOUT AS DESCRIBED IN CHAPTER 3.

Section 7-2 - Troubleshooting

The panel monitors system integrity. Items monitored for integrity are:
1. Audio appliance circuit field wiring
2. Input voltage AC (120VAC, 50-60 Hz), Backup Battery (24VDC)
3. Battery voltage level
4. Battery circuit field wiring
5. Amplifier functionality
System status is indicated to the operator via the audio supervision circuits on the voice
evacuation panel, and the AC and TROUBLE LEDs, and the Trouble Form C relay contacts on
the Audio Booster.
If a trouble condition is detected, the voice evacuation panel will indicate a short condition on the
audio or visual output circuit.
When there are no trouble conditions detected on the Audio Booster, the AC LED will always be
"ON" and the TROUBLE LED will always be "OFF". When a trouble condition is detected, the AC
LED will remain "ON" and the TROUBLE LED will always be "ON".
Figure 7-1A (SPB-160) and 7-1B (SPB-80/4) shows the location of all trouble location LEDs
within the Audio Booster panels. Table 7-1 on Page 51 cross-references the trouble location
LEDs on the PC board to the proper troubleshooting procedure.
NOTE:When D24 TBL LED is illuminated, indicating a panel Trouble, at least 1 of the other
yellow LEDs will also be illuminated indicating the trouble location.
HAVE QUALIFIED SERVICE PERSONS IMMEDIATELY
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