8·34
Troubleshooting
Portable
PLUS
Computer
All items except the oscilloscope
and
probe are included in the expensed tool package (part number
45711-67801).
Oscilloscope routines are available from two sources. The first source is preferred for the reasons
listed .
• Diagnostic module. This is the preferred source, which
is
described first below. The diagnostic
module can run the scope routines with only a small portion of the system operable. In addition, it's
the only source
that
can
run
the internal
RAM
routine.
• Disc·based diagnostic program. This is the alternate source, which is described second below. A
large portion of the system must be operable in order to use this source. In addition, it doesn't
provide a routine for internal
RAM
.
8.3.1 Diagnostic Module Scope Routines
Follow this procedure for using the diagnostic module scope routines:
CAUTION
If
a modem is installed, be sure to place
an
insulating sheet between the modem PCA
and
the
metal cover of the diagnostic module. Otherwise, components may be damaged.
1. Disconnect the battery, separate the case,
and
install the diagnostic module in left receptacle (re-
ceptacle
2,
under
the
QD
key).
If
modem is installed be sure to insulate it from the sheet metal cover of the diagnostic module.
CAUTION
Be
sure the connectors are aligned properly
when
connecting the extension cables.
If
they're
connected with pins misaligned, components may be damaged or system operation disrupted.
2.
Connect the LCD extension cable between the motherboard PCA
and
the display cable. Connect
the keyboard extension cable between the motherboard
PCA
and
the keyboard cable. Check
that
all connectors are aligned properly.
3.
Connect a recharger to
the
computer. Press
CID
to
turn
on
the computer.
If
the oscilloscope
menu
appears, go to the next step.
If
nothing appears in the display, a default scope routine should be running while waiting for you
to press a
key.
If
the keyboard
is
working, you can select
and
use scope routines (even though the
display is blank) according to the following steps. Otherwise, you can check the system using the
default scope routine using waveshapes labeled
"£0"
on
the schematic diagrams.
If
the system
doesn't operate
at
all, you can check the unit according to table 8-5, "Startup
Problems:
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