IBM 5110 Series Maintenance Analysis Procedures page 160

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DISPLAY MAP
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103
-Switch the L32-64-R32 switch to all three
positions and observe the display.
Does the video change correctly as the
switch is operated?
Y N
104
Bad G2 (display) card (see MAP 050 for
jumpering).
Bad display L32-64-R32 switch.
Check/ replace Z3 (display and control panel)
cable (see MAP 0210 and MIM 248,249).
105
-Switch the RUN switch under the covers to
RUN.
-Switch the DISPLAY REGISTERS switch to
DISPLAY REGISTERS.
Does the failure appear as long vertical lines
(exceeding several characters in length), on
the display?
Y N
1
6
106
-Switch the RUN switch under the covers to
NOT RUN.
Is the video on the display stable 1
Y N
107
-Switch the RUN switch under the covers
to RUN.
-Probe K6-A02 (-external vertical sync).
(See M I M 248 display Z3 socket
locations).
Are both lights on and steady?
Y N
A A A A
Q
R S T
A A A
R S T
MAP 0500-12
108
- Disconnect the cable from Z3.
-Probe K6-A02.
Are both lights on and steady 1
Y N
109
-Connect the Z3 (display and control
panel~
cable.
Bad G2 (display) card (see MAP 050 for
jumpering).
110
Bad display assembly (see MIM 204).
Check/ replace Z3 (display and control
panel) cable (see MAP 0210 and MIM
248,249).
111
Bad display assembly (see MIM 204).
Check/ replace Z3 (display and control panel)
cable (see MAP 0210 and MIM 248,249).
112
-Switch the RUN switch under the covers to
RUN.
-Switch the DISPLAY REGISTERS switch to
NORMAL.
No more than 25 seconds after RESTART is
pressed, the following events should occur:
1. ABCDEFGH appears on the top line of the
5110 display.
2. ABCDEFGHJKLMNP appears on the top line.
3. The top line is cleared and either LOADO or
CLEAR WS appears once on one and only
one line of the 5110 display.
-Press RESTART.
Do all three events shown above occur in
sequence after RESTART is pressed?
Y N
II
1 1
4 3
A A
U V
01JAN79
EC 836600 PEC 835541
MAP 0500-12
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