8·42
Troubleshooting
Portable
PLUS
Computer
8.6
Testing
the
SNALink/3270
Software
Drawer
Use the following procedure to check an
HP
50922A SNALink/3270 Software Drawer.
1.
Write
down
the numbers of the sockets in the SNALink drawer that contain ROM ICs (for exam-
ple,
'IL"
and
'IH")
.
2.
Install the SNALink drawer in a good Portable PLUS computer (in either
the
left
or
right slot).
3.
Connect the computer to a good
HP
9114 Disc Drive using two good HP-IL cables.
4.
Conn
ect
the
drawer to the SNALink test board using the standard SNALink cable.
5. Turn
on
the disc drive, then
turn
on
the computer (press
CID
or other keys, if necessary).
•
If
the main
PAM
screen appears, go to step
6.
•
If
the MS-DOS system (not
PAM)
is
active
at
turn
on, type exit (Return) to obtain the
main
PAM
screen,
then
proceed according to either of the other choices for this step.
•
If
any
other display appears,
or
if
no
display appears, remove the SNALink drawer
and
try this
again.
If
the computer
turns
on
normally only
when
the drawer is removed, replace
the
SNALink PCA. Otherwise, check the computer.
6.
Turn
on
a 5-Vdc power supply
and
adjust it to 4.9 to 5.1 Vdc.
7.
Connect
the
5V power supply to the two-pin connnector on the test board: ground to ' GND",
+5V
to '
vce.
8.
Insert
the
service disc in the disc drive. Load
and
run
the SNALink diagnostic program. (Type
c:snalink.exe (Return
),
or
else select 'SNALink Diag" from the menu.) The test checks
in
both
slots
for SNALink drawers.
9.
Observe
the
displayed test results. In particular, check that the displayed list
of
occupied ROM
sockets is correct (step 1 above).
•
If
the
program finds the drawer
in
the correct slot, if no 'ERROR" messages are displayed,
and
if
the
program lists all of the occupied ROM sockets, then the SNALink drawer
and
ROM ICs
are good.
Stop
testing
here.
•
If
the
program doesn't find the drawer, repeat the test with the drawer installed
in
the
other
port.
If
the problem remains, replace the PCA.
•
If
the program displays
an
' Interrupt" error, replace the PCA.
•
If
the
program displays a -Control"
or
'Transmission" error, swap the SNALink cable, test
board,
or
PCA to isolate the problem. Replace the indicated item.
•
If
the program finds
no
occupied ROM sockets (although some are occupied), replace
the
PCA.
•
If
the
displayed list
of
occupied ROM sockets is wrong (but the program finds
some
occupied
sockets),
swap
the
improper ROM ICs or
the
PCA to isolate the problem. Replace
the
indicated
item.
•
If
the program displays a 'Checksum" error, check that the jumper in
J2
is installed properly (it
should be in
the
'ROM" position unless 32K-byte EPROMs are installed
in
the
drawer).
Then
swap
the indicated ROM IC
or
PCA to isolate the problem. Replace the indicated item.
10.
Verify the repair
by
repeating the previous steps.
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