Portable PLUS Computer
Product History
11-3
6. HP 45711A/B, all units. The A and B versions of the computer provide 128K bytes of built-in
RAM
on the memory PCA
(AI)
.
In addition, the original battery power straps are flexible.
You
must
replace
the
flexible
straps
with
new
ones
if you open the case. (Replace them with the newer 'stiff" straps,
part
number 45711-
00007.)
The troubleshooting procedures, replaceable parts list, component location diagram,
and
sche-
matic diagram for these versions are presented in section 11.3, 'Reference Information for A
and
B Versions:
7. HP 45711A/B, all units. The A and B versions of the computer incorporate a
gray
liquid-crystal
display
(LCD)
that functions like the
green
display of current units, except that the green display
offers greater contrast and a wider viewing angle. The two
LCD
module assemblies are inter-
changeable. The gray
LCD
module assembly
is
available as part number 45711-60904.
•
If
a gray
LCD
module tests bad in
an
A or B version, you can replace it either
~th
another
gray module or with a green module.
•
If
a gray
LCD
module tests good in
an
A or B version, but the customer requests a green
display, you can make this
'upgrade'
replacement.
8. HP 45711C/D, all units. HP 45711 ElF, serial numbers before
2713A-----.
The C
and
D ver-
sions
and
early E and F versions of the computer contain a memory PCA
(AI)
that provides 256K
bytes of
RAM.
The memory PCA contains two connectors for mounting two piggyback PCAs
(each containing
128K
bytes of
RAM)
and two jumpers for configuring these piggyback PCAs. For
all of these these versions,
RAM
blocks 0 and 1 are contained on the memory PCA. For the E
and
F versions,
RAM
blocks 2 and 3 are contained on the two piggyback PCAs.
In addition, the memory PCA contains system
ROM
in
six
ICs, which are soldered to the PCA.
The replacement procedure, troubleshooting procedures, replaceable parts list, component location
diagram, and schematic diagrams for these versions are presented in section 11.4,
'Reference In-
formation for Early C/D/E/F Versions:
9. HP 82981A Memory (RAM) Drawer, serial numbers before
2547A-----.
Earlier versions of the
plastic case used metal inserts in the screw holes, requiring the use of machine screws for
assem-
bly. Replacement screws are part number 0515-0346.
If
the plastic case
is
damaged, replace the case and screws with the parts listed in table 9-11.
(Service Note
82981-01.)
10. HP 82982A Software (ROM) Drawer, with
no
serial number. (The serial number, if present, is
located on the metal cover.) Plating slivers from manufacturing may cause failure of the
PCA.
If
bad, replace the PCA with a
new
PCA. (Service Note 82982-01.)
11. HP 82982A Software (ROM) Drawer, serial numbers before
2547A-----.
Earlier versions of
the plastic case used metal inserts in the screw holes, requiring the use of machine screws for
assembly. Replacement screws are part number
0515-0346.
If
the plastic case
is
damaged, replace the case
and
screws with the parts listed in table 9-10.
(Service Note 82981-02.) .
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