IBM 5280 Manual page 269

Q STU
666 6
COMMUNICATIONS MAP
EIA WRAP ERROR MAP
PAGE
7 OF 12
030
Remove the communications
MPU card.
- If the short goes away the
communications MPU card is
bad.
If the short
present, the
is defective.
is still
logic board
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600,
ENTRY POINT A.
031
- Check each FRU to find the
failure.
The internal cable.
The communications MPU card.
- The logic board.
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600,
ENTRY POINT A.
032
Remove the parts listed below
one at
a
time in the order
given until the short goes
away. The last part removed
is defective.
The internal cable.
The communications MPU card.
- The EIA line adapter card.
If the short is still present,
the logic board is defective.
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
033
The land pattern is open on the
logic board.
M N P
666
f'1AP 3019-7
034
- Power off.
- Remove the EIA line adapter
card.
- Use the CE meter on the
RXI
scale to measure the
resistance to a ground pin.
A short will read less than
20 ohms. Measure the
'Received' line at probe
point
B.
Is the line grounded?
Y N
035
036
The EIA line adapter card
is defective (A-D7)(MIM
823) .
- Remove the communications
MPU card.
- If the short goes away, the
communications MPU card is
defective.
If the short is still
present, the logic board is
defective.
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600,
ENTRY POINT A.
037
- The land pattern is open on
the logic board.
038
Defective communications MPU
card (A-E5)(MIM 811).
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
EC840S74 PECS397S7
MAP 3019-7