IBM 5280 Manual page 213

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A
COMMUNICATION MAP
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3SLS Xl'lIT/RECV CHECK
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PAGE 17 OF 20
102
Disconnect the external
cable from the machine at
connector J140.
Use the CE meter on the RXI
scale to measure the
resistance to a ground pin.
A short will read less than
20 ohms. At the P140
connector ON THE EXTERNAL
CABLE, measure from P140-09
'Data Tip', to P140-21
,'Signal Ground' (MIM 867,
probe point F).
Is the line grounded?
Y N
103
Defective internal cable.
104
- Defective external cable
105
Defective logic board
l06
The test is complete.
- Return to the MDls, answer 'Y'
and follow the prompts.
"1 A P
3
0
1 1 -1 7
EC340S7
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t
PEC3397S7
MAP 3011-17