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POWER MAP 0200
PAGE
1 OF
ENTRY POINTS
FROM
ENTER THIS MAP
MAP
ENTRY
PAGE
STEP
NUMBER
POINT
NUMBER
NUtlBER
0000
FF
065
0100
A
001
0400
CC
060
001
( ENTRY POINT AJ
DANGER
When the power ON/OFF'switch is ON
~,
the
following are connected directly to the
mainline power:-
-The front panel fuse
&
switch,
-The degauss coil,
-Parts of the power supply card and
-The twisted-pair connection from P3
pins
8
and 9 (on the power supply card)
to the analog card (P7).
-Be careful when measuring voltages in
these areas.
-Switch power OFF
~
and remove the power
cord from the mainline power socket
before such actions as:-
-disassembling,
-inspecting for failures1
-making resistance measurements, etc.
-Switch power OFF
~.
-Verify that the power cord is plugged in
to an active outlet.
eReseat the A2 and A3 logic gate cables
and verify that the problem
1S
still
present.
-Switch power OFF
~.
-Wait 10 seconds.
-Switch power ON
m
and look CAREFULLY at
lamp 1.
Does lamp
1
[POWER GOOD) flash at least
once and then go OFF?
Y N
002
-Connect a meter to +8.5 V on the logic
board.
(0 V
=
B2D08, +8.5 V
=
B2B11).
-Switch power OFF
~
and wait at least 30
seconds.
-Switch power ON
m.
Did the voltage pulse once or several
times [approximately once a second) and
then
fall
to zero? The voltage pulse may
be very small.
Switch the meter down a
range
if
necessary.
Y N
003
IS
the voltage constant between
7.6
and 9.4 Volts?
Y N
3 2 2
BCD
Copyright IBM Corp 1981
MAP
0200-1
E)(IT POINTS
EXIT THIS MAP
TO
PAGE
STEP
MAP
ENTRY
NUMBER
NUMBER
NUMBER
POINT
058
0100
BB
04FEB8l
MAP
0200-1
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