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What Each Test Does
This section gives an overview of what each test does.
A "ROM" test failure indicates a problem with the system CPU card read only memory.
A "RAM" test failure indicates a problem with the system CPU card read/write memory.
A "SYS" test failure indicates a problem that can't be isolated to a specific card. The problem
is some type of short or open circuit on or between cards and the backplane. This test
requires at least one working station card and one working line card. Bus connections between
station cards are only checked if more than one station card is present. The "SYS" test
light will flash, indicating a missing test, if the system can't find a working station-line card
pair. This will occur if the system doesn't have a working line card.
Failures on lights labeled Ll, L2, L3, L4, L5, or L6 may indicate a problem with a specific line
card. Each card is tested for proper connections to a station card, conferencing audio level
control, and touch tone generator control. This test requires at least one working station card
for a valid test.
Failures on lights labeled S1, S2, S3, S4, S5, or S6 may indicate a problem with a specific
station card. Each card is tested for proper connections to a line card, circuit shorts, circuit
opens, and card selection. This test requires at least one working line card for a valid test.
Repairing a Problem
The system should always be powered down when adding or removing cards.
No Stations Work
Does power cycling the system restore operation? If so, a power supply or CPU card problem
may exist. Run the controller self test for more information.
Does the system have power (main and expansion supplies)? If you suspect a power supply is
malfunctioning, try to run the main controller with the power supply from the expansion unit
(if any) or substitute a supply known to be good. The main controller will operate with the
expansion unit powered down.
If power cycling doesn't restore operation, try to remove all cards but the first station card
(station 10) and the CPU card. If operation is restored by removing most of the cards, one of the
removed cards is suspect. Cards should be added, one at a time, until the problem is found.
If operation isn't restored by removing cards, try a station card and CPU card known to be
good. If this doesn't restore operation, then the main or expansion backplane may not be
functioning properly.
Some, But Not All, Stations Work
If some stations work, try to rearrange/substitute station cards and/or stations to allow opera-
tion from the non-working position. If a station card and a station known to be functional
fail to operate when installed in the non-working position, suspect the CPU card and the con-
troller. If another station card or station works in that position, replace the defective card or
station. Use the station self test to try to diagnose the problem of a malfunctioning set.
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