IBM 5280 Manual page 102

DATA ENTRY MAP MAP 1020-2
A-AI KEYBOARD
PAGE 2 OF 11
(Step 001 continued)
KEYBOARD
SYMPTOMS COMMENTS REPAIR ACTION
-------------+--------------------+-------------------------------
SINGLE KEY
FAILURE
A SINGLE KEY FAILS
TO OPERATE
CORRECTLY OR A
CHARACTER REPEATS
ON THE SCREEN.
1. CLEAN OR REPLACE THE
KEYBOARD PAD PC BOARD.
2. CLEAN OR REPLACE FAILING
KEY MODULE (MIM 121).
-------------+--------------------+-------------------------------
MULTIPLE
KEY
FAILURES
SUSPECTED BIT
FAILURES CHANGING
ALL CHARACTERS OR
INVALID SCAN CODES.
LOOK FOR FAILURES
GROUPED BY ROWS
OR COLUMNS.
THE POWER ON
CHECKOUT FUNCTION
(MIM 931) MAY BE
USED TO COMPARE
SCAN CODES TO
THOSE IN MIM 113.
1. RESEAT CABLES TO AND FROM
THE KEYBOARD LOGIC CARD
(MIM 101).
2.
CLEAN TOP AND BOTTOM
CONNECTOR CONTACTS ON THE
KEYBOARD PAD PC BOARD (MIM
127).
3. REPLACE THE KEYBOARD LOGIC
CARD (MIM 101).
4. REPLACE THE KEYBOARD PAD
PC BOARD (MIM 127).
-------------+--------------------+-------------------------------
NO KEYBOARD
RESPONSE
NO RESPONSE TO
ANY KEY.
1. CHECK POWER TO THE KEYBOARD
(MIM 219).
2. IF ANY VOLTAGE IS MISSING,
GO TO POWER MAP SOOO, ENTRY
POINT A.
3. MAP 1020, STEP 003, ENTRY
POINT B.
-------------+--------------------+-------------------------------
SPEAKER
I
SPEAKER FAILS TO
I
MAP 1020, STEP 048, ENTRY
FAILURE CLICK OR BUZZ. POINT C.
Did you find the indication in
the symptom index?
Y N
1
1 3
A B
ECS40874 PEC839787
MAP 1020-2