Vodavi Starplus DHS, Technical Manual

Page: 295 / 338

7-2 CPU/Power LED
Table 7-1: Central Processor Unit (CPU)
SYMPTOM DIAGNOSTIC AID CAUSE CORRECTIVE ACTION
No system operation
LCD telephones
have no display
No LED’s lit at any
telephones
CPU
Heartbeat/Power
LED Not Lit
No AC input Check commercial AC outlet.
KSU Cord Verify that both ends of AC cord are plugged in.
Power On
Switch Switch the KSU AC power switch to the ON
position.
AC Fuse Inspect and replace KSU exterior AC input fuse.
DC Fuse Inspect and replace system DC output fuse.
No system operation
LCD telephones may
have data frozen on
displays
No LED’s lit at any
telephones or
intermittent
CPU is locked up
CPU
Heartbeat/Power
LED Lit
Initialization
Switch
1. Verify initialization switch operated to the
ON position.
† If the Initialization switch is not in the ON
position at the time the KSU is powered, the
Power Up Initialization sequence at the end
of
Chapters 2 and 3 should be followed.
† If the system was properly initialized,
proceed to step 2.
2 Power down/up and observe system
recovery. (The system power should remain off
for a least 5 seconds for this test). If no
heartbeat is seen proceed to step 3.
3 Power down, remove KSU cover, detach all
station cabling (25 pairs), and power up. (The
system power should remain off for a least 5
seconds for this test).
If no heartbeat is seen
proceed to step 4.
4 Power down, inspect for the following:
† Loose or unplugged 3x8 Expansion Module,
6 Port CO Module or Option Module ribbon
cables.
† Improperly aligned ribbon cables.
† Improper installation of the system software
EPROM, located in socket U9 CPU Module.
EMERGENCY ACTION
Since the unique battery protected
customer database will be erased
and the system will boot up with
default programming.
1. Operate the initialization switch to the OFF
position.
2 Return the initialization switch to the ON
position.
3 IF CPU/POWER LED is still not flashing,
replace the KSU.
4 Initialize and test according to the Power Up
Initialization sequence.