IBM 3274 51C Maintenance Information page 42

020
Map A40 Diskette Failure
Code 0010
PAGE 5 OF 6
• Measure -5 volts DC at power supply No.1, plug 1 pin 11
with reference to ground (008).
Is the voltage within the limits of -4.6V to -S.6V7
Y N
021
• If voltage is missing verify for -5V at power supply No.1,
socket 2 pin 11 and repair pin 11 connection if needed .
• Replace TSR power supply No.1.
Go To Map Al00, Entry Point
A.
022
Go to Page 4, Step 014, Entry Point B.
023
• Obtain the backup customized system diskette.
• Run IML tests.
Does IML test code (0010) still fail7
Y N
024
Go To Map A100, Entry Point A.
025
• This would normally be experienced after a board replacement
and your machine 'does not have' type B adapter features (card
Nos. 24, 25, 26, 27) then verify that board has a wire from
E2-Boa to E2-G02.
• Verify cable continuity from disk drive cable, board socket Y5 to
cable plug at drive file card. See cable chart Figure C-14.
• Replace the Disk Drive unit.
• Run IML tests.
Does IMl test code (0010) still fail7
Y N
6
J
026
Go To Map A100, Entry Point A.
MAPA40 -5
Chapter 3. Maintenance Analysis Procedures 3-15