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Fault Finding, Front Panel Fault Codes
The "Power-On" LED is used to flash error messages should certain fault
conditions arise on the drive.
A four bit binary code is used (long flash
=
logical 1, short flash
=
logical 0) with the most significant bit occuring first:
e.g. short, short, long, short
=
Z
(0010)
Fault Code
1
(0001)
No index track data burst.
Fault Code
2
(0010)
No Flag 00
Fault Code
3
(0011)
Motor speed outside +1
%
tolerance
in normal operation.
Fault Code
..
(0100)
Motor speed outside ±.10% tolerance
in normal oper ation.
Fault Code
5
(0101)
Flag 00 stays TR UE.
Fault Code
6
(0110)
STEP received while WRITE GATE
is TR UE.
Fault Code
7
(0111)
Static WRITE FAULT.
Fault Code
8
(1000)
Not used.
Fault Code
9
(l001)
Microprocessor self-test fail.
Fault Code
10
(1010)
No index.
Fault Code
11
(lOll)
Motor not up to speed.
Fault codes I,
Z,
3, 5, 9, 10 and 11 are monitored during the initial power-up
sequence of the drive.
The remaining codes, namely 4, 6 and 7 are constantly
monitored during normal operation.
All fault codes are latched by the processor
and the drive must be restarted to clear.
Codes 3, 4, 10 and 11 generate an
interface WRITE FAULT as do those fault conditions leading to code 7.
If one
of these codes if flashed, maintenance personnel should be called.
IMS International
5000 Series Microcomputers/7.01.83/page 99
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