IBM 5280 Manual page 74

DATA ENTRY MAP MAP 1010-2
A-AI DISPLAY
PAGE 2 OF 1S
001
(ENTRY POINT A)
- Data station cover removal
procedu~e
is in HIM 031.
The display controlled by the Keyboard/Display MPU card is
attached to partition 0 in main storage.
- - - NOTES - - - -
1.
If there is no video, IPL the Diagnostic Diskette to attempt
to display the sign-on screen (HIM 941).
2. The Display is checked first so that it may be used as an
indicator in the MAP's.
3. The probe must be correctly grounded to ensure correct
operation (MIM 905).
DISPLAY
SYMPTOM
COMf'IENTS
I
REPAIR ACTION
----------------+-------------------+----------------------------
DARK DISPLAY NO DISPLAY 1. ENSURE 'THAT THE DISPLAY
FUSE IS GOOD (MIM 141).
2. ENSURE THAT THE +5 VDC,
-5 VDC AND +S.5 VDC ARE
PRESENT AT THE A-AI CARD
LOCATION (MIM 531).
3. SEE MIM 461 AND 463 FOR
LEVEL AND RIPPLE CHECKS.
4. IF ANY VOLTAGE IS
MISSING OR OUT OF
TOLERANCE, GO TO POWER
MAP 8000, ENTRY POINT A.
5. IF ALL DISPLAYS FAIL
AND THE KEYLOCK FEATURE
IS INSTALLED, GO TO
MAP 1026, ENTRY POINT A.
6. IF THE REPAIR ACTIONS
ABOVE DO NOT CORRECT THE
FAILURE, GO TO MAP 1010,
STEP 002.
1----------------+-------------------+----------------------------1
(Step 001 continues)
EC840S74
PECS397S7
MAP 1010-2