IBM 5280 Manual page 273

A A
D E
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o
0
COMMUNICATIONS MAP
EIA WRAP ERROR MAP
PAGE 11 OF 12
063
The logic board is defective.
- - OR
Defective communications MPU
card (A-E5)(MIM Sll).
If a 'Ros Patch' cable is
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
064
- Probe the extra 'Received' line
at probe point C.
Up light: On or Pulsing.
Down 1
i
ght : On or Pulsing.
Are the lights correct?
Y
N
065
- The EIA line adapter card is
defective (A-D7)(MIM 823).
066
Probe the extra 'Received' line
at probe point D.
Up light: On or Pulsing.
Down light: On or Pulsing.
Are the lights correct?
Y N
A
F
067
- The EIA line adapter card is
defective (A-D7)(MIM 823).
- - OR - - - -
The logic board is defective.
A A
C F
1
MAP 3019-11
o
068
- Power off.
the wrap connector. - Remove
Remove
card.
the EIA line adapter
- Use the
scule
CE meter on the RXl
to measure the
resistance for a short to the
'Transmitted' line. A short
will read less than 20 ohms.
Measure the extra 'Received'
line at probe point D.
Is the line shorted to the line
being wrapped?
Y N
069
- The
wrap connector is
de-f ect i ve.
070
Remove the parts listed below
one at a time in the order
given
u~til
the short goes
away. The last part removed
is defective.
- The internal cable.
The communications MPU 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.
071
- Remove the internal cable
- Probe the extra 'Transmitted'
line at probe point E.
Up light: On or PulSing.
Down light: On or PulSing.
Are the lights correct?
Y N
EC840S74 PEC839787
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A A
G H MAP 3019-11