IBM 3274 51C Maintenance Information page 70

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B
1
MAP A130 I.M. 2400,4800,
9600 Failure
PAGE 2 OF 5
002
• Perform and repeat the self test by depressing and holding the
AL T switch in position 2.
• Wait about 10 seconds. the correct operator panel indicators
are:
1. Test indicator on.
2. Good indicator flashes once (every 4 seconds) for each self
test.
3. Poor indicator off .
• Release the AL T switch.
Are indicators correct7 See *A·
Y N
003
(Entry Point
B)
• Replace the front end card G2 (Set Card Switches. para.
5.4.6.1 ).
• Replace the TAC card C2 (set card switches para. 5.4.8).
• Replace the processor card. See ·B*
• Inspect for loose operator panel cable in board socket Z2.
• Inspect for loose cable plug P3. on operator panel indicator
card. See Figure 4-13.
• If you have a failing led indicator. verify cable continuity from
operator panel plug P3 to board socket Z2. See FO-9.
• Replace operator panel card.
Go To Map A100, Entry Point A.
004
Is the operate indicator on and the test indicator off7
Y N
005
Go to Step 003, Entry Point
B.
006
When connected to the T.P. Network are the data quality
indicators as expected (good led on, poor led off)7 See
·C·
Y N
MAP A130-2
*A*
Releasing the AL T 2 switch stops the self test from running.
·B*
When integrated modem is 2400. 4800 BPS. processor card
location is D2 or E2 when 9600 BPS. See FO-5.
*C·
When the 3274 phone line is connected to the master modem and
the carrier detect signal is being received the good indicator goes
on.
Chapter 3. Maintenance Analysis Procedures
3-43

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