HP Portable PLUS - Page 153

11-10 Product History
Portable PLUS Computer
Table 11-4. Diagnostic Test Results for Early C/D/E/F Versions
Failure Code
Assembly-Level
Component-Level
Oscilloscope
Replacement
Replacement
Routines
116-118
Memory PCA.
If only one or two
Internal
ROM read
127-129
ROMs indicated, re-
place individual
AIUI6-AIUI8 or
AIU27-AIU29
(ROM).
If more than two
ROMs indicated, latch
or transceiver sus-
pected. Trace using
scope routine.
0: yy
... Memory PCA.
If only one or two
Internal RAM write
1: yy
...
RAMs indicated, in-
Internal RAM
read
speet for solder
bridges or shorts
on
surface-mounted RAM
ICs (see table 11-5).
Replace memory
PCA.
If more than two
RAMs indicated, latch
or transceiver sus-
pected. Trace using
scope routine.
2: yy ... Swap piggyback RAM Swap piggyback RAM
PCAs between con- PCAs between con-
nectors AIJS
and AIJ6 nectors AIJS and AIJ6
(a
PCA must be in-
(a PCA must be in-
stalled at AIJS). Then stalled at AIJS).
Then
if the error changes to if the error changes to
"3", replace piggyback "3", replace piggyback
PCA now at AIJ6; if PCA now at AIJ6; if
error
"1' recurs, re-
error
"2" recurs, re-
place memory
PCA. place memory PCA.
3: yy ...
Swap piggyback RAM
Swap piggyback RAM
PCAs between con-
PCAs between con-
nectors AIJS
and
nectors AIJS and
AIJ6. Then if the error
AIJ6. Then
if the error
changes to
"2', replace
changes
to '2', replace
piggyback
PCA now
piggyback PCA now
at AIJS; if error "3" re-
at AIJS; if error
"3' re-
curs, replace memory curs, replace memory
PCA.
PCA.