HP Portable PLUS - Repair Procedures; Software Drawer Jumper Configurations

Portable PLUS Computer
Trouble.hootlng 8·15
Table 8·4. Software Drawer Jumper Configurations
If Bank Number ...
I
Contains These ICs ...
I
Set Jumpers ...
Bank 0, 1
Independent
ROMs
XWI
= "A'"
Bank 0, 1
Independent
EPROMs
XWI
= "B'
Banks 4, 5, 6, 7
Independent
ROMs
XW2
=
'A'
XW3
=
'A'
XW4
=
"A'
XW5 =
"A"
XW6
=
'A"
Banks 4, 5, 6, 7 Independent EPROMs XW2 = "B"
XW3 = " A' or 'B"
XW4
=
'A'
XW5
=
"A"
XW6
=
"A'
Bank 7· Sequential ROMs
XW2
=
"A'
XW3
=
"B'
XW4
=
'B'
XW5 =
"B'
XW6
=
'B'
Bank 7· Sequential EPROMs XW2
=
'B'
XW3
=
' B'
XW4
=
'B'
XW5
=
'B'
XW6
=
"B"
• Four sequential pairs located in sockets (or banks 5, 6, 7, and 4 (in that order). Banks 4, 5, and 6 aren't pr ese nt in this configuration.
8.2.2 Repair Procedures
The following tables describe procedures that you should follow for repairing certain problems. Be-
cause these procedures assume certain results from previous tests, use them only
when directed by
other procedures.
For assembly-level repair, follow the indicated procedures only as far as required to make
an informed
decision as to which assembly
is bad. After substituting a new assembly, repeat the appropriate test to
verify the repair. Then complete the main diagnostic procedure in section 8.2.1.
For component-level repair, follow
the indicated procedures as described.