HP 7925D Service Manual page 226

7925
Table A-9. Test Failure Summary
Appendix A
TEST SECTION TEST RESULT
NO. NO. LED'S
TEST/SECTION FAILURE
PROBABLE SOURCE
17
-
• • •
•
MICROPROCESSOR
PCA-A2*, disc drive
16
-
• •
•
0
RALU, FLAGS PCA-A2
15
-
• •
0
•
PHI
PCA-A1*, PCA-A2
14
• •
0 0 FIFO's
PCA-A1*, PCA-A2
17
•
• •
•
NTORE stuck-at-O.
PCA-A1*, PCA-A2
16
•
• •
0 NTORE stuck-at-1.
PCA-A1*, PCA-A2
15
•
•
0
•
Upper FIFO data error.
PCA-A1
14
• •
0 0 Lower FIFO data error.
PCA-A1
13
•
0
•
•
PHI/FIFO HANDSHAKE PCA-A1
17
• • • •
EOT flag stuck.
PCA-A1
16
• • •
0
Write-to-PHI not complete. PCA-A1
15
• •
0
•
Sector word counter does not
PCA-A1
handshake.
14
•
•
0 0 Read full/write full does not
PCA-A1
override EOS (read from PHI
handshake does not complete).
13
•
0
•
•
EOT not detected. PCA-A1
12
•
0
•
0 Lower NYBBLE data bad.
PCA-A1
11
•
0 0
•
Upper NYBBLE data bad.
PCA-A1
12
•
0
•
0 FORMATIER/SEPARATOR Data PCA-A1*, PCA-A2
17
• • • •
EOW stuck true. PCA-A1
16
• • •
0
No EOW in data test. PCA-A1
15
• •
0
•
Bad data from formatter/
PCA-A1
separator.
14
•
•
0 0 Overrun stuck true. PCA-A1*, PCA-A2
13
•
0
• •
Undetected overrun. PCA-A1*, PCA-A2
12
•
0
•
0 No EOW in 8th word test.
PCA-A1
11
•
0 0
•
8th word flag stuck true.
PCA-A1*, PCA-A2
10
•
0
0 0 8th word flag stuck false.
PCA-A1*, PCA-A2
11
•
0 0
•
CRC/DATA PATH SWITCH PCA-A1*, PCA-A2
17
•
•
•
•
No EOW in test. PCA-A1
16
•
• •
0 CRC error stuck false.
PCA-A1*, PCA-A2
15
•
•
0
•
CRC error stuck true.
PCA-A1*, PCA-A2
14
•
•
0 0 Bad generated CRC pattern.
PCA-A1
10
•
0 0 0 DRIVE STATUS Drive electronics*, PCA-A2
17
•
• • •
Drive fault. Drive electronics
16
• • •
0 Drive busy while ready.
Drive electronics, PCA-A2
10
•
0 0
O·
Drive not ready. Drive electronics
o
=
LED "OFF"
• =
LED "ON"
.to Display flashing * Most probable source
A-45