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6-4
Chapter 6 - Maintenance/Troubleshooting
System Diagnostics
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 6-1: Central Processor Unit (CPU)
Diagnostic Aid
Power Supply LED
No AC input
KSU Power
Heartbeat/LED not
Cord
flashing
Power On
Switch
AC Fuse
DC Fuse
CPU
Initialization
Switch
Heartbeat/LED not
flashing
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 PS exterior AC input fuse.
Inspect and replace PS DC output fuse.
1. Verify initialization switch is in ON position.
Power down, remove MPB Module, and
install MPB.
If the Initialization switch is not in the ON
position when the KSU is powered, the
Power Up Initialization sequence at the
end of Chapters 2 & 3 should be followed.
If the system was properly initialized,
proceed to Step 2.
2. Power 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, detach all station cabling, and
power up. (The system powershould 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 Modules or cables.
Improperly aligned ribbon cables.
Improper installation of the system
software EPROM, located in socket U9
CPU Module.
1. Move initialization switch to the OFF position.
2. Return initialization switch to the ON position.
3. IF CPU/LED is still not flashing, replace MPB.
4. Initialize and test according to the Power Up
Initialization sequence.
System D iagnosti cs
Corrective Action
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