Table of Contents
Advertisement
4-10
Chapter 4 - Maintenance and Troubleshooting
The Power Supply Unit (PSU) provides direct current power to the system in the form of
+30VDC, +5VDC, and -5VDC. LEDs on the PSU in each cabinet show presence of each voltage
type. Each PSU provides connections for batteries and charging current for batteries (optional).
System does not operate (Loss of
+5VDC) ...
Analog phones and CO Line do not
operate (Loss of -5VDC) ...
Battery Back-up for system not
working ...
The Miscellaneous Interface Board (MISB)
on hold and background music inputs.
The external paging port does not
work ...
Some or none of the 4/6 external
control contacts do not operate ...
Music on hold is not heard ...
Background music is not heard ...
The DTRU and DTRU4 provides dual tone multifrequency tones associated with dialing
functions.
DTMF Single Line Telephones can
not dial out ...
DISA calls can't dial system
resources after call connection ...
DID lines won't ring intended
station(s) ...
Table 4-10: Power Supply Unit (PSU)
Problem
Table 4-11: Miscellaneous Interface Board (MISB)
Problem
Table 4-12: DTMF Receiver Unit (DTRU/DTRU4)
Problem
Peripheral Cards and Components
Possible Solutions
Check LEDs on PSU.
Check power switch.
Check LEDs on PSU.
Check power switch.
Check to ensure BATT SW is on.
provides external paging, external contact control, music
Possible Solutions
Check programming.
Check wiring.
Check programming.
Check RAU.
Check music source on MISB and volume
control on music source.
Possible Solutions
If SLT has dial tone, check for installation
of DTRU/DTRU4.
If large volume of calls in the system, you
may need to add additional DTRUs.
Check DISA programming.
Check DID programming.
Advertisement
Table of Contents
Troubleshooting
