Advertisement
t
POWER MAP
PAGE
4 OF
-Switch power OFF
~.
-Reconnect the logic gate A3 cable.
-Disconnect the logic gate A2 cable.
-Connect a meter to power supply connector
P3-l (+12V).
See Figure 1-2.
-Use the potentiometer mounting plate as
ground.
-Switch power ON
m.
DoeS the +12 v supply pulse once or
several times and then fall to zero?
Y N
031
Is the +12 V supply constant between +10
and
+15
Volts?
Y N
032
-Switch power OFF
~
and remove the
power cord from the mainline power
socket.
-Exchange the power supply card.
GO TO MAP 0000, ENTRY POINT BB.
033
There may be a short circuit in a logic
card.
-Switch power OFF
~.
-Reconnect the A2 logic gate connector.
-Remove the logic cards one at a time in
the following order, each time testing
the +12V;
Feature cards 04, G2, F2, E2
Base cards
e2,
D2
Convergence logic card B2
-If the problem di sappears, exchange the
last card removed.
Has the problem gone?
Y
I
~~4TO
PAGE 6, STEP 060,
ENTRY POINT CC.
035
GO TO MAP 0000, ENTRY POINT BB.
03b
-Switch power OFF
~.
-Reconnect the logic gate A2 connector.
-Unseat the analog card from its edge
connector (P4).
-Switch power ON
m.
Does the +12 V supply [at P3-l1 still
pulse once or several times and then fall
to zero?
Y N
037
-Switch power OFF
~.
-Disconnect P5 from the analog card.
Figure 4-7)
eReseat the analog card.
-Switch power ON
~.
Does the +12 V supply at P3-1 now pulse
once or several times and then fall to
zero?
11
P
Q
R
M P
Q
R
3
MAP 0200-4
L
-Switch power OFF
~.
-Exchange the video card.
GO TO MAP 0000, ENTRY POINT BB.
039
-See Figure 1-2.
-Meter the +103v supply to the analog
card at test points P3-39
atld
40.
Does it pulse when power is switched
ON?
Y N
040
.Switch power OFF
~.
-See Figure 3-1.
-Meter the l03V wiring for short
circuits.
-Repair or exchange any failing FRU.
-If
no
problem found, exchange the
power supply card.
041
-Switch power OFF
~.
-Exchange
the analog card.
GO TO MAP 0000, ENTRY POINT BB.
042
-Switch power OFF
~
and remove the power
cord from tl,e mainline power socket.
-Exchange the power supply card.
GO TO MAP 0000, ENTRY POINT BB.
043
[ENTRY POINT EEl
-Switch power OFF
~.
.Reconnect the logic gate
A3
cable.
.Unseat the analog card from
its edge
connector P4.
-Switch power ON
m.
.See Figure 1-2 and Figure 3-2 and use a
logic probe to trace these signals:
HORIZ RETRACE, D2J13-B2G13
HORIZ SYNC, B2J13-A3D13-Analog card P4-1
to Analog card P4-2 (TP).
VERT RETRACE, D2G08-C2G07-B2G08
VERT SYNC, C2G12-A3D12-Analog card P4-28
to Analog card P4-3 (TP).
Do BOTH probe lamps light at
ALL
the above
paints?
Y N
044
.Switch power
OFF
~.
-Check cables and connectors for
continuity or short circuits to ground.
-Repair or exchange any failing FRU.
GO TO MAP 0000, ENTRY POINT BB.
04 FEB8l
MAP
0200-4
Advertisement
