HP Portable PLUS - Page 130

10-4 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):
A-ROMyyL .. .
For receptacle noted
For receptacle noted
Plug-in
ROM read
A-ROMyyH
... previously, check that
previously, check that
Find plug-in
ROM
jumpers are in proper
jumpers are in proper
locationst; swap
locationst; swap
known good
ROM at
known good
ROM at
socket marked
yyL or
socket marked
yyL or
yyH~; replace ROM
yyH~; check ROM
PCA
or ROM IC as
PCA using scope rou-
indicated.
tine, or replace
ROM
IC, as indicated.
Messages:
Broken loop
Try new cable; check
Try new cable; check
HP-IL
connections; check
connections; inspect
I/O plate (or swap
internal connections to
and retry); replace the
I/O plate assembly (or
motherboard
PCA.
swap assembly and re-
try); check continuity
of
HP-IL interface cir-
cuit (see schematic);
replace A2U15 (HP-IL
controller).
Loop error, data not Remove peripherals Remove peripherals
HP-IL
received as sent and run the HP-IL and run the HP-IL
test; try new cable; .
test; try new cable;
check connections; check connections;
bad HP-IL peripheral; bad HP-IL peripheral;
check
I/O plate (or check I/O plate (or
swap and retry); re- swap and retry); check
place the motherboard
HP-IL components us-
PCA.
ing scope routine;
replace A2Ul5
(HP-IL
controller).
Number of devices on Check connections;
if
Check connections; if
HP - IL
HP-IL loop = wrong HP-IL/HP-IB interface
HP-IL/HP-IB interface
number
connected, perform
connected, perform
system configuration
system configuration
in
PAM; check HP-IL in PAM; check HP-IL
peripheral; if occurs peripheral; if occurs
for every peripheral, for every peripheral,
replace the replace A2U15
(HP-IL
motherboard PCA.
controller).
Transmitted or Rcvd.
Check test connector; Check test connector;
RS-232
Data line(s)
bad
replace the
trace signals using
motherboard
PCA. scope routine.