HP Portable PLUS - Page 128

10-2 Reference Information
Portable PLUS Computer
Table 10-1. Diagnostic Test Results (Continued)
Test Result
Assembly-Level Component·Level
Oscilloscope
Replacement Replacement
Routines
Failure Codes (Continued):
130
Al U30 (configuration
A1U30 (configuration
Config
EPROM
EPROM)-burn new
EPROM)-burn new
EPROM IC before in- EPROM IC before in-
stalling (section 8.
4).
stalling (section 8.4).
210 Motherboard
PCA.
A2U10 (LCD
LCD RAM write
controller).
LCD
RAM read
215 Motherboard
PCA. A2U1S (HP-IL
HP-IL
controller).
216 Motherboard
PCA. A2U16 (modem multi-
controller).
217 Motherboard
PCA. A2U17 (PPU).
218 Motherboard PCA.
A2U18 (serial multi-
RS-232
controller).
314
Modem
PCA. A3U14 (modem
controller).
3??
Modem PCA
Check modem circuit
according
to table 8-
11 , 'Repairing the
Modem.'
4rcc
Swap the keyboard
Swap the keyboard
(r is row number)
module, then retry.
If
module, then retry. If
(cc is column number)
fixed, replace
fixed, replace
keyswitch (or key-
keyswitch (or key-
board module) after
board module) after
checking continuity;
if
checking continuity; if
not fixed, replace the
not fixed, replace
motherboard
PCA.
A2U16 (keyboard
multicontroller, or
SIP
resistors A2R12,
A2R13, and A2R14).
0: yy ...
Memory PCA. *t
If only one or two
Internal RAM write
1: yy .. .
RAM ICs indicated
Internal
RAM read
2:
yy
...
(see table 8-3), replace
3:
yy ...
individual ICs. (Note
that one
IC corre-
sponds to several
codes.) Replace mem-
ory
PCA.*t
If more than two
RAMs indicated, latch
or transceiver sus-
pected. Trace using
scope routine.
*t