IBM 3274 51C Maintenance Information page 30

Map A 10 BUS TEST.
PAGE 2 OF 5
(Step 001 continued)
Did any indicator fail to light when the IMlswitch was
pressed and held? See
-A-
Y N
002
You are in the wrong MAP. Go back to Subsystem Problem
Isolation start. (Chapter 2)
003
• Unseat all the cards from the A 1 board as a group, except card
numbers 9. 12 (Ref. FO-3 and FO-5) and then run Bus test.
Note: unseating/removing card No. 21 (Encrypt/Decrypt)
destroys the master key. See para. 6.1.3.
Did Bus test fail?
Y N
004
Does the 3274 contain device adapter type B Feature? -B-
y N
005
• Reinstall the cards that were unseated in step 003 one at a
time (install top card to card connectors) and run Bus test
after you install each card. Bus test should fail again when
you install one of these cards. Replace the failing card.
Run Bus test to verify the repair.
Go To Map A100, Entry Point A.
006
• Reinstall the type B adapter cards as a group: C2, 02. E2, F2.
and run bus test.
Did bus test fail?
Y N
007
• Reinstall the remaining cards that were unseated in step
003 one at a time (install top card to card connectors) and
run Bus test after you install each card. Bus test should
fail again when you install one of these cards. Replace the
failing card. Run Bus test to verify the repair.
Go To Map A100, Entry Point A.
MAPA10-2
*B*
To determine type B feature see back of machine for type B coax
panel.
Chapter 3. Maintenance Analysis Procedures 3·3