Central Processor Unit (Cpu) - Vodavi Starplus DHS Technical Manual

7-2
SYMPTOM
No system operation
LCD telephones
have no display
No LED's lit at any
telephones
No system operation
LCD telephones may
have data frozen on
displays
No LED's lit at any
telephones or
intermittent
CPU is locked up
Table 7-1: Central Processor Unit (CPU)
DIAGNOSTIC AID
CPU No AC input
KSU Cord
Heartbeat/Power
Power On
LED Not Lit
Switch
AC Fuse
DC Fuse
CPU Initialization
Switch
Heartbeat/Power
LED Lit
EMERGENCY ACTION
Since the unique battery protected
customer database will be erased
and the system will boot up with
default programming.
CAUSE
Check commercial AC outlet.
Verify that both ends of AC cord are plugged in.
Switch the KSU AC power switch to the ON
position.
Inspect and replace KSU exterior AC input fuse.
Inspect and replace system DC output fuse.
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.
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.
CPU/Power LED
CORRECTIVE ACTION