91369 Service Manual
5-21
Troubleshooting
7 If the recorder and the associated interface circuitry is good, an error report line is printed upon detection of
an error. LED Error Codes are shown in
Table 2
. The error codes may be helpful for determining whether
the error originates from the interconnect board, the recorder CPU, or the OEM recorder module. Refer to
LED D6 in step 6 first; use the printed error code (if available) for possible additional information.
Table 2: Recorder Error Codes
Error Code
(hex)
Failed Assembly or Likely Cause
80
EPROM checksum bad
8F
Stack pointer bad
81
Internal RAM will not write all zeroes
82
Internal RAM will not write all ones
83
Timer 0 - No overflow
84
Timer 0 - High byte bad
85
Timer 0 - Low byte bad
86
Timer 1 - No overflow
87
Timer 1 - High byte bad
88
Timer 1 - Low byte bad
30
SDLC Errors - Bad Xmit status
31
SDLC Errors - No SI
32
SDLC Errors - No start flag
33
SDLC Errors - Bad address
34
SDLC Errors - Bad frame type
35
SDLC Errors - No end flag
10
Stuck I/O bus bit 0 low
11
Stuck I/O bus bit 1 low
12
Stuck I/O bus bit 2 low
13
Stuck I/O bus bit 3 low
14
Stuck I/O bus bit 4 low
15
Stuck I/O bus bit 5 low
16
Stuck I/O bus bit 6 low
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