IBM 5280 Manual page 138

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083
DATA ENTRY MAP
MSR
PAGE 12 OF 14
- Defective MSR card (A-Bl)
(MIM 501, 771).
084
- Defective
(MIM 761).
085
Reader
- Probe A-B2B04,
501) .
Assembly
paR'
( 1'1IM
Install a
A-Cl-TP-040,
jumper from
ground (MIM 303).
Up light: Off
Down light: On
Test paR',
to
Are the lights correct?
Y N
086
Defective Disk/Main MPU Card
(A-Cl) (MIM 303, 501).
- If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
087
- Leave probe on A-B2B04, , POR'"
<MIM 501).
Remove the
A-CI-TP-040,
ground (MIM 303).
Up light: On
Down light: Off
jumper -from
Test POR',
to
Are the lights correct?
Y N
A A
S T
A A
S T
MAP 1030-12
088
Power off.
Set the CE meter to the RXI
scale.
Connect
A-B2B04~
and the
ground.
the positive lead to
' - POR' (MIM 531),
negative lead to
Is the meter reading 30 ohms or
above?
Y N
089
- Leave the meter connected
as in the previous step.
- Use the net list (MIM 531).
Remove each card in the
net, one at a t'ime, until
the meter reads 30 ohms or
above.
Replace
the last card
removedo
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.
090
Defective Diskette/Main MPU
Car d (A- C 1) 0-11 M 303, 5 0 1 ) .
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
091
Probe A-B2B02,
(MIM 531).
'1 MHz Clock'
Up 1; ght: On
Down light: On
Are the lights correct?
Y N
EC839787 PEC839661
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U V MAP 1030-12