IBM 5280 Manual page 159

D
2
DISKETTE MAP
DISKETTE BASE SWAP
PAGE 5 OF 12
030
- Measure +5 and -5 Vdc at P02 on
the Data Station Driver/Receiver
card (IBM 5281 or 5282 MIM 209
and 455).
- Measure +5, -5 and +24 Vdc on
the Diskette Drive Control card
for the failing drive (IBM 5281
or 5282 MIM 325).
Check all of these for both
voltage and ripple (5281 or 5282
MIM 463).
Are All of the measurements within
tolerence?
Y N
031
- GO TO MAP 8000, ENTRY POINT
A
of the Data Station that has
the incorrect voltage or
ripple (IBM 5281 or 5282).
032
Are all
attached
failing?
Y N
of
to
the Diskette Drives
this Data Station
6
033
Swap plug P48 with P4C on the
Diskette Driver/Receiver card
(A-Dl) <MIM 319).
NOTE: The failing diskette drive
will now have the other
address (was 48 now 4C or was
4C now 48).
Does the same diskette drive
fa
i
1
?
Y N
K L M
L M
MAP 2010-5
034
- Defective Diskette
Driver/Receiver card
(MIM 305).
- - - - - OR
(A-Dl)
- Defective DiSKette/Main MPU
car
d (A- C 1) ( N I M 3 0 3) •
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
035
Swap the input plugs P09 and PII
at the Data Station
Driver/Receiver card (IBM 5281
or 5282 MIM 325).
Note: For this and future
the failing drive is
it's original address.
step's,
back to
Does the same diskette drive fail?
Y N
036
GO TO MAP 2210, ENTRY POINT A.
037
- Swap input plugs P09 and Pl1
back to their original
positions.
- Swap the output plugs PlO and
P12 at the Data Station
Driver/Receiver card (IBM 5281
or 5282 MIM 325).
Does the same diskette drive fail?
Y N
6
N
038
- Defective Data Station
Driver/Receiver card (IBM 5281
or 5282 MIM 211).
EC840874
MAP 2010-5