IBM 5280 Manual page 139

A
V
1
2
DATA ENTRY MAP
MSR
PAGE 13 OF 14
092
- Leave the probe connected.
Up light: Off
Are the lights correct?
Y N
093
Defective Disk/Main MPU Card
( A- C 1) ( t-1I M 303, 5 0 1 ) •
- If a 'Ros Patch cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
094
- Power off.
- Set the CE meter to the RXl
scale.
Connect the positive lead to
A-B2B02, '1 MHz clock', and the
negative lead to ground.
Is the meter reading 30 ohms or
above?
Y N
095
A
W
Leave the meter connected as
in the previous step.
Use the net list (MIM 531).
Remove each card in the net,
one at a time, until the
meter reads 30 ohms or above.
Replace the last card
removed.
If all the cards in the net
have been removed and the
meter reading is still below
30 ohms, suspect a ground on
the Logic Board.
A A
U W
I
~1AP
1030-13
2
096
- Defective Diskette/Main MPU
Ca r d (A-C 1) (M 1M3 03, 501).
- If a 'Ros Patch' cable is
~o~~e~tpd to the
card.
GO TO MAP 0600, ENTRY POINT A.
097
- Load 'MSRTEST' from the
diagnostic diskette <MIM 971).
- Probe A-B2B07, '- Extended
Sense Bit' (MIM 531).
Pass the test card through the
reader several times (MIM 751).
Up light: On
Down light: Pulses
Are the lights correct each time
a test card is passed through the
reader?
Y N
098
- Leave the probe connected.
Up light: Off
Down light: On
Are the lights correct?
Y N
099
Defective MSR card
501) •
(MIM
1 1
4 4
A A
X Y
ECS397S7 PECS39661
MAP 1030-13