IBM 300 Service Manual page 74

MAP 0410 (continued)
Check the modem status according to its type.
– From a close telephone, call the modem. According to the modem answer, select
4-8
2220 Setup and Service Guide
Is there a correct voltage in the ac outlet?
Yes No
003
Ask the customer to have the installation serviced.
004
The modem is defective. Exchange it (see "Modem Exchange Procedure" on
page 4-14).
005
IBM Modem Type Status
7855 The modem status is the
following:
With: ONH
7857 The modem status is the
following:
With: OH
Hayes The modem status is the
following:
OH
HS
TR
MR
7858 The modem status is the
following:
AT CMD
td_ rd_ dsr_ II_
006
the appropriate action:
ASYN8N A 9600 a
LED ON
LED ON
DTR(108)
LED ON
RFS(106)
IBM 7857 V25BIS aa
td_ rd_ dsr ec_ 11_
LED OFF
LED ON
DTR(108)
LED ON
CTS(106)
LED OFF
CD(109)
LED OFF
LED ON
LED ON
LED ON
ec aa
Action
v The status is correct. Go to
Step 006.
v The status is not correct. Go to
Step 020 on page 4-10.
v The status is correct. Go to
Step 006.
v The status is not correct. Go to
Step 024 on page 4-11.
v The status is correct. Go to
Step 006.
v The status is not correct. Go to
Step 028 on page 4-11.
v The status is correct. Go to
Step 006.
v The status is not correct. Go to
"7858 Modem Installation" on
page 1-39 for modem and
installation checking.