Symptom Explanation Conditions That Could Cause This Symptom Host communication failure
•
Customizing response.(Models 81 R, 82R, 91 R, and 92R).
•
No AC power to modem.•
Defective I/O cable.•
Improperly installed 1/0 cable.•
Defective modem.•
Communication link failure.CAUTION:
To avoid the possibility of electrical shock, switch off power and disconnect power cord before
disconnecting cables or removing a component, such as the planar board, power supply, or diskette drive.
(For translations of this safety notice, see Safety Notice 10 in IBM 3174 Safety Notices, GA27-3824.)
~
- Perform an Alt 2 IML. See "Alt 2 IML (Test 82) Procedure" on page 1-24.
Is 2082 displayed?
Yes No
[10021
- Use the status code. See the 3174 Status Codes manual.
Did the problem occur after the 3174 had been working?
Yes No
[1004 [
Use Online Test 2 Customizing Menu to verify that the customizing response numbers are proper for your 3174 options and host link attachment. See "Test 2: Configuration Menu" on page 2-92.
Continue with Step 005.
(From step 004)
Is the attachment a V.35 interface? Determine by checking cable part numbers. See Chapter 5.
Yes No
[1006 [
Set the communication cable TestlOper switch to Test. Go to (ENTRY POINT A) in Step 007 of this Map.
Determine if you have the cable with the three-switch or one-switch TestlOper switch. Select one of the following:
• Three switch positions. Set the switch to Test Mode 1 as shown in Table 2-6 on page 2-48.
• One or two switch position. See "V.35 Cable Wrap Test (One TestlOper Switch)" on page 2-77 and do the three steps of the procedure.
(Step 007 continues)
Chapter 2. Diagnostic Information
2-27
---- ,-_ ...
".. ,
007 (continued) (ENTRY POINT A)
Perform an Alt 1 IML to display the 40 prompt message. See "Obtaining the Alt 1 IML 40 Prompt Message" on page 2-39.
Press Enter. Use the terminal connected to port
O.
Key in 4 and press Enter. The diagnostic test menu is displayed.
Key in 1101 and press Enter.
If a terminal Is not available to perform offline tests, run the test from the operator panel. See "How to Run Communication Adapter Optional Tests (HG 11)" on page 2·75.
18 2011 displayed?
Ves No
Ii00BI
- Press Adv to see the extended Information from the status code. Match the code xx11 number to one of the fo"owlng codes.
0211 (cable or wrap plug not connected)
- Check that the modem cable Is plugged Into the 3174 communication socket labeled HG 11.
- Check that the modem cable Is the correct part number. See Chapter 5.
- Replace the planar board assembly.
0311 (cable or wrap plug not providing proper X.21 attachment) Check that the cable is not an EIA part number. See Chapter 5.
- Exchange the X.21 cable.
- Exchange the planar board assembly.
2x11 (cable wrap failure; the planar board assembly, modem cable, or wrap plug is defective, or the modem cable or wrap plug part number being used is incorrect)
See code 3030 in the 3174 Status Codes manual. Verify if the 2x code is a cable or wrap plug part number compatibility problem. See Chapter 5.
- If you want to isolate the problem to the planar board assembly or cable, run the wrap test with the wrap plug. For the part number, see Figure 2-5 on page 2-49, Figure 2-6 on page 2-50, or Figure 2-7 on page 2-51.
Install the wrap plug and run the wrap test as previously done in step 007.
Is the 3174 a Model81R or 91R (EIA/V.35 Interface)?
Yes No
§J
Go to Step 020 on page 2-29.
If you previously did the V.35 wrap test in test mode 1, repeat the wrap test again in test mode 2. See Table 2-6 on page 2-48 and to Step 007 in this MAP. If you previously did the V.35 wrap test with the one switch, reconnect the interface cable to the short modem cable and continue.
Set the communication cable TestlOper switch back to Oper.
To run the modem status test, key in 1104 and press Enter.
Is the status code 4513?
Yes No
§J
- Match the failing status code to one of the following and take the appropriate action.
(Step 012 continues)
2-28
3174 Models 81R through 92R Maintenance Information012 (continued)
4510 (missing 'data set ready' and 'carrier detect')
The status code shows the modem or its connections are causing the problem.
- Verify the communication cable for proper continuity, when the switch(s) is in the operate position. See Figure 2-5 on page 2-49, Figure 2-6 on page 2-50, and Figure 2-7 on page 2-51.
4511 (missing 'carrier detect' and 'data set ready' is active)
- Verify whether your link should be providing the 'carrier detect' signal.
- Go to (ENTRY POINT B) in Step 13 of this MAP.
4512 (missing 'data set ready' and active 'carrier detect')
The status test shows that the modem is causing the problem. Go to (ENTRY POINT B) in Step 13 of this MAP.
The planar board assembly is receiving 'data set ready' and your link is providing the 'carrier detect' signal.
(ENTRY POINT B)
Is the connection to an IBM modem?
Yes No
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The modem or the communication link is causing the problem.Is the modem wrappable?
Yes No
~
The modem or the communication link is causing the problem.- The Test/Oper switch is still set to Oper.
- Run the modem wrap test with the modem clock. Key in 1102 and press ENTER.
Is 2011 displayed?
Yes No
~
Check the modem for proper operating mode and that it is wrappable.Note: Do not run the test with the modem set to External Speed Control.
The 3174 modem wrap test shows a defective modem.
The modem is functioning correctly.
Note: Some IBM modems allow you to run further checks. See the modem documentation.
- Verify the operational status of the communication network.
1020
I
(From step 010) (Step 020 continues)
Chapter 2. Diagnostic Information
2-29
MAP 0300 (continued)
020 (continued)
The Test/Oper switch is still set to Test.
Perform an Alt 1 IML to display the 40 prompt message. See "Load the Diagnostic Test Monitor (Terminal Control)" on page 2-40.
Press Enter. Use the terminal connected to port O.
Key in 4 and press ENTER. The diagnostic test menu is displayed.
To run the cable wrap test with the modem clock, key in 1105 and press ENTER.
If a terminal is not available to perform offline tests, run the test from the operator panel. See "How to Run Communication Adapter Optional Tests (HG 11)" on page 2-75.
Is 2011 displayed?
Yes No
§J
The modem or its connections are causing the problem.
The wrap testing indicates that the 3174 is functioning correctly and was able to run using the modem clock signal.
Verify the operational status of the communication network and the other modem signals.
Verify the communication cable for proper continuity when the switch is in the operate position.
Insert the Control diskette into the diskette drive.