IBM 5110 Series Maintenance Analysis Procedures page 101

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o
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W
2
019
(Entry Point H)
BRING UP MAP
PAGE 3 OF 23
Does the machine have an APL-BASIC switch
(see MIM 205)?
V N
020
Go to Page 22, Step 222, Entry Point G.
021
- Remove E4 (APL ROS)
-Set the APL-BASIC switch to BASIC
No more than 25 seconds after RESTART is
pressed, the following events should occur:
1. ABCDEFGH ppears on the top line of the
5110 display.
2. ABCDEFGHJKLMNP appears on the top
line.
3. The top line is cleared and LOADO appears
once on one and only one line of the 5110
display.
-Press RESTART. Wait 25 seconds.
Do all three events shown above occur in
sequence after RESTART is pressed?
V N
022
-Install the E4 (APL ROS) card.
Go to Page 22, Step 222, Entry Point G.
023
Bad E4 (APL ROS) card.
u
V
2 2
MAP 0400-3
024
-Probe H2-B03.
Remove the following cards in order until the
DOWN light goes off. The last card removed
is defective:
F2, J2, K4.
If the DOWN light remains ON, then:
Bad L2 (exec ROS) card (see MAP 050 for
jumpering).
Bad G2 (display) card (see MAP 050 for
jumpering).
Bad H2 (base I/O) card.
Bad keyboard PC board (see MIM 251).
Check/ replace Z4 (keyboard) cable (see Map
0210 and MIM 206,255).
025
-Switch the RUN switch under the covers to
RUN.
- Probe the card select lines listed below. Record
conditions other than the DOWN light on and
the UP light off.
o
J2-S10
1 J2-U13
2 J2-U10
3 J2-S13.
Is the DOWN light on and the UP light off for
all four probe points?
V N
4
026
Are both lights on for any of the four probe
points?
V N
027
Bad J2 (processor) card (see MAP 050 for
jumpering).
028
-Switch the DISPLAY REGISTERS switch to
NORMAL.
Go to Step 019, Entry Point H.
01JAN79
EC 836600 PEC 835541
X
MAP 0400-3
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