IBM 5280 Manual page 267

G
4
H
4
J
COMMUNICATIONS MAP
4
EIA WRAP ERROR MAP
PAGE S
OF
12
011
-
-
Remove the EIA line adapter
card.
If the
short goes away the
E! .A.
l~~e
~rI;lIn+ot"
c~rd ~5
- --,-
- -.
defective (A-D7)(MIM 823).
If the short is still
present the logic board is
defective.
012
The land pattern is open on
the 1 Og1 c boa"rd
013
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 'Transmitted' line at probe
point C.
Is the line grounded?
Y N
014
01S
The EIA line adapter card is
defective (A-D7)(MIM 823).
Disconnect the internal cable
from the communications MPU card
A-ES-JOI connector.
- Use the CE meter on the RXl
scale to measure the resistance
to a ground pin. A short will
read less than 20 ohms. Measure
the 'Transmitted' line at probe
point C.
Is the line grounded?
Y N
D E K L
4 4
MAP 30l9-S
016
O~7
The internal
defective.
cable
is
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.
018
019
The land pattern is open on
the logic board
Remove the internal cable
Probe the 'Transmitted' line at
probe point E.
Up light: On or Pulsing.
Down light: On or Pulsing.
Are the lights correct?
Y N
020
Defective communications MPU
card (A-ES)(MIM 811).
If a 'Ros Patch' cable is
connected to the
card~
GO TO MAP 0600, ENTRY POINT A.
021
- The internal cable ;s defective.
EC840874 PEC839787
K L MAP 30l9-S