IBM 5280 Manual page 140

A
X
1
3
A DATA ENT RY
t'1AP
Y
1 MSR
3
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14
100
Power off.
Set the CE meter to the RXI
scale.
Connect the positive lead to
A-B2B07, Extended Sense
Bit', and the negative leud
to ground.
Is the meter reading 30 ohms or
above?
Y N
101
102
Leave the meter connect0d
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.
Defective Keyboard/Display
MPU
Card (A-AI) (MIM 200,
501).
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
103
Pass the test card through the
reader several times while
observing the display.
Is an error message presented on
the display each time?
Y N
A B
Z A
A B
Z A
MAP 1030-14
104
The test card
passed through
should be
the reader
upside down to cause an error
condition on purpose.
Pass the card through the
reader upside down, so that
the magnetic stripe will not
be read by the reader.
Is any error message presented
on the display?
Y N
105
106
Defective MSR card (A-Bl>
(MIM SOl, 771>.
GO TO MAP 0100, ENTRY POINT A.
107
Defective MSR card (A-S1)
501, 771).
(MIM
EC839787 PECS39661
MAP 1030-14