Digital Equipment DEC 3000 Series Service Information page 333

Run the ISDN diagnostic to verify system operation. If a
3.
failure reoccurs, then replace the FRU listed for that error.
Replace FRUs one at a time, running the ISDN diagnostic
after replacing each one to determine if the failure has been
corrected.
Audio cable
a.
Audio module
b.
I/O boaed
c.
Error Code Description
02 Data miscompare testing Line Interface Unit Status
register
04 Data miscompare testing Line Interface Unit Priority
register
06 Data miscompare testing Line Interface Unit Mode
register 1
08 Data miscompare testing Line Interface Unit Mode
register 2
A Data miscompare testing Multiplexer Control
register 1
C Data miscompare testing Multiplexer Control
register 2
E Data miscompare testing Multiplexer Control
register 3
10 Data miscompare testing Main Audio Processor
Mode register 1
12 Data miscompare testing Main Audio Processor
Mode register 2
14 Data miscompare testing Data Link Controller Mode
register 1
16 Data miscompare testing Data Link Controller Mode
register 4
20 Data miscompare testing internal digital loopback
using MCR1
24 Data miscompare testing internal digital loopback
using MCR2
26 Data miscompare testing internal digital loopback
using MCR3
28 Data miscompare testing internal analog loopback
30 Interrupt test data miscompare
32 Interrupt test time out
34 Invalid 79C30A interrupt
36 Interrupt not generated
38 All interrupts not received
40 DMA Test time out
42 DMA Test unexpected interrupts
44 DMA Test data miscompare
LED Codes and Status/Error Messages
14–11