IBM 5110 Series Maintenance Analysis Procedures page 200

B
1
Local CBS coupler MAP
for 38LS
PAGE 2 OF 7
006
- The modem telephone tests OK as an ordinary
telephone.
To test the Auto Answer function, make DTR
active by:
1. Load the communications diagnostic cartridge
or 5110 diagnostic diskette.
2. Enter 898 to select the BSCA Test Patterns
when the DSP MENU is displayed. DO NOT
enter
0
to select the option menu at this time.
3. Select STEP mode and step 8 to transmit
continuous SYN characters.
4. Select Y for the Business Machine option.
Answer the other questions based on the local
station configuration.
- Dial the local modem telephone from a nearby
telephone.
- Listen for a high pitched tone (answer tone) that
lasts for approximately 3 seconds.
Do you hear the answer tone 1
Y N
007
Cradle the handset on the nearby telephone.
Go to Page 5, Step 043, Entry Point B.
008
Do you hear the data (SYN characters) after
the answer tone 1
Y N
009
Do you hear the dial tone approximately 20
seconds after the answer tone stops 1
Y N
C D
010
Bad C2 (38LS) card.
See the BSC MIM for jumpering and
switch setting instructions.
C 0
MAP 0832-2
011
Line disconnected.
Suspect the test pattern stopped or a wrong
procedure. Restart this MAP.
Suspect the C2 (38LS) card.
012
The Auto Answer function tested OK. Check for
disconnect operating correctly by:
1 . Lift the handset on the local modem
telephone. This should disconnect the line and
display a N on the reply line of the MOl display.
2. Listen at the telephone that originated the call
for the data transmission to stop.
3. Listen for dial tone approximately 20 seconds
after the data stopped.
Do you hear the dial tone 1
Y N
013
- Cradle the modem telephone handset.
- Probe the SH (Red) terminal at the coupler
with the - meter lead.
Is SH at a • EIA level (·3 to ·25 VDC)1
Y N
014
Telephone problem.
Have the customer notify the responsible
person.
015
- Lift the modem telephone handset from the
cradle.
Does SH go to a + EIA level (+3 to +25
VDC)1
Y N
3 3
E F
016
Telephone problem.
Have the customer notify the responsible
person.
01JAN79
EC 836600 PEC 835541
MAP 0832-2