IBM 5280 Manual page 233

E
2
COMMUNICATIONS MAP
NON AUTO ANSWER
PAGE 3 OF
S
010
See 38LS switch setting chart in
MIM 813,81S, or 817 to determine
which switches should be on.
(If using programable
attenuation, the 38LS card
should have been set for 0 db.
Are all switches on the 38LS line
adapter card set correctly?
Y N
011
Set correctly and rerun the
test.
012
Connect khe dB meter between
A-D7DOS 'SW Data Xmit' and
A-D7DOS 'Gnd'. The DB level
should be equal to the level set
in the 38LS line adapter card
switches.
Note:
A
quick way to indentify a
communications MPU card that has
programmable attenuation is as
follows:
If there are 4 transmit
level attenuators on the lower
left corner of the
communications MPU card, the
card has programmable
attenuation(MIM 811).
Is the db level correct?
Y N
4
F G
G
MAP 3013-3
013
- Power off.
- Remove the 3SLS card.
- Use the CE meter on the RXI
scale to measure the resistance
to a ground pin. A short
Wlll
read less than 20 ohms. Measure
A-D7D05, 'SW Data Xmit', to
A-D8D08, 'Gnd' (MIM 867, probe
point C).
Is the line grounded?
Y N
014
- Defective 38LS line adapter
card (A-D7)(MIM (12).
OlS
Remove the communications MPU
card (A-ES)(MIM (11)
Is the line grounded?
Y N
016
Defective communications MPU
card (A-ES)(MIM 811).
If a 'Ros Patch' cable
;5
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
017
Defective communications
card (A-ES)(MIM 811).
MPU
If a 'Ros Patch' cable ;5
connected to the card,
GO TO MAP 0600, ENTRY POINT A.
ECS40874 PEC839787
MAP 3013-3