IBM 5280 Manual page 190

S
5
DISKETTE MAP
INTER LED
PAGE 6 OF
046
More than one 'Drive In Use' LED
fail?
Y N
047
Is the failing 'Drive In Use'
LED in the controller?
Y N
048
- Probe A-CIB08
A-C2D05 (4COO)
(4800) o,r
File In
Use' for the failing LED on
the logic board (MIM 501).
Up light: On
Down light: Off
Are the lights correct?
Y N
I
049
I I
- Leave
the probe on the
previous point.
7 7
Up light: Off
Down light: On
Are the lights correct?
Y N
050
Defective Diskette/Main
MPU card (A-Cl) (MIM
303) •
- If a 'Ros Patch' cable
is connected to the
card
t
GO TO MAP 0600,
ENTRY POINT A.
T U V W
V W
MAP 2280-6
051
052
There is an open or short in
this line, use MIM 313 and
Logic Diagram LDOl-3 to
isolate the failure.
- IPL the system with Diagnostic
Diskette 1.
Do all the 'Drive In Use' LEDs
turn off?
Y N
053
- Probe A-CIBOS (4800) or
A-C2D05 (4COO) '- File In Use'
for the failing LED on the
logic board (MIM 501).
Up light: Off
Down light: On
Are the lights correct?
Y N
054
- Defective Diskette/Main MPU
card (A-Cl) (MIM 303).
If a 'Ros Patch' cable ;s
connected to the card,
GO TO MAP 0600,
ENTRY POINT A.
055
- There ;s an open or short ;n
this line, use MIM 313 and
Logic Diagram LDOl-3 to
isolate the failure.
056
- There is no problem with the
'Drive In Use' LEDs.
GO TO MAP 2000, ENTRY POINT A.
EC840874
MAP 2280-6