IBM 5110 Series Maintenance Analysis Procedures page 240

MACHINE CHECKOUT
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(Step 001 continued)
Did either LOADO or CLEAR WS (spelled
correctly) appear only once on one and only
one line of the 5110 display?
V N
002
Is the PROCESS CHECK light on?
V N
003
Is the 5110 display dark for all positions
of the BRIGHTNESS control?
V N
004
Go To Map 0200, Entry Point A.
005
Go To Map 0500, Entry Point A.
006
Go To Map 0420, Entry Point A.
007
The 5110 display raster is grossly distorted if it
has a black rather than a white background, or is
greatly reduced in size.
Is the 5110 display raster grossly distorted?
VN
008
Is the 5110 display raster rolling?
V N
009
Does the 5110 display raster contain
wide horizontal bars similar to a TV set
with the horizontal hold out of
adjustment?
V N
555
ABC 0
D
MAP 0900-2
010
Is the IN PROCESS light on?
V N
011
Are the top 13 lines of the display entirely
blank (there are 16 lines total for the
display)?
V N
012
Go To Map 0400, Entry Point A.
013
-Press and hold the RESTART switch.
Are both the PROCESS CHECK and IN
PROCESS lights on?
V N
014
Bad L2 (exec ROS) card (see MAP 050 for
jumpering).
Bad PROCESS CHECK light.
Bad IN PROCESS light.
Bad RESTART switch.
Check/ replace Z3 (display and control
panel) cable (see MAP 0210 and MIM
248,249).
015
-Release the RESTART switch. Wait 25
seconds.
Is the PROCESS CH ECK light on?
V N
553
E F G
01JAN79 '{.
EC 836600 PEC 835541
MAP 0900-2