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A-2
Component-Level Repair
HP 82718A
Table A-1. Diagnostic Test Error Messages (Continued)
Error Message
Probable Cause
Possible Cause
ram 6 BAD
U25
U17
ram 7 BAD
U26
U17
ram 8 BAD
U27
U17
ram (-K)
RAM with highest address
U17
(incorrect amount)
mcf <number> BAD
U2
mcf BAD
Yl, U2, U15, U28, R14, R15, C7,
C8, C19, C20
*buss BAD:wrote xxx, read YYY
shorts in RAM bus (U20-27)
U17 pins 5, 7, 9, 11, 15, 17, 19,
21
*BM:dir bit won't set
U17
U20
*P not updated after BM up
U17
U20
*P not updated after BM down
*bIockmove:MEM
U20
U17
^address lines BAD:xxx,yyy
U20
U17
1LL6 BAD
Yl, C7, C8, U2, U15, U28, R14,
R15, R22, R23, C19, C20, C44,
C45
1LL6
rom (U18) BAD, rom (U19)
J3, ROM connector
1LH7
BAD, and 1LH7 BAD all
appear.
*no MEMIC chips
U17, J3
*A,B,C,D BAD
U17
A,B,C,D not imique
U17
*H, D-l-H BAD
U17
*adders BAD
U17
*MEMIC didn't select
U17
♦decoders/chip
enables BAD
U17
U20 - 27
*sum set
U17
U20 - 27
*sum Pset
*sum add
"update bits screwy
U17
"update bits BAD
"rollover didn't
U17
"2 byte indirect BAD
U17
U20
"2 byte indirect updated
"2 byte indirect not updated
modem BAD
modem PCA
power PCA, modem PCA, flex
connector, J2, U2
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