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P
3
ANALOG HAP
PAGE
4 OF
5
t8
The horizontal deflection coil is
connected to the RED and BLUE wires.
Tile vertical deflection coil is connected
to the YELLOW and GREEN (or BLACK) wires.
The resistance of each coil should be less
than 2 ohms.
-Measure the resistance of the 2
deflection coils.
-Inspect the short wire jumper on the plug
and verify its continuity.
Do both coils and the jumper seem
good~
Y N
039
-Repair
Wlrlng
or connector if possible
(then exchange the CRT).
GO TO MAP 0000, ENTRY POINT BB.
0'10
-Assemble any disconnected FRU's.
-Switch power ON
~.
-See Figure 6-9. video card test points.
-Measure the voltage at these
point5~
VIDEO CARD
VOLTAGES AND
TEST POINTS
TOLERANCES
400
280 - 450 Vdc
5
5.0 Vdc
±0.5V
Are both Voltages correct?
V N
041
-Switch power OFF
~.
-See Figure 6-7 to find open or short
circuits.
-Exchange/repair video card. analog
card~
wiring or
CRT.
GO TO MAP 0000, ENTRY POINT BB.
042
-See Figure 6-8 to verify the connections
to the brightness potentiometer.
liaS the problem found?
Y N
0'13
-Switch power
OFF
~.
-R~movQ
the
analog card completely.
CAUTION
-Touch the EHT conductor to ground.
-Disconnect the EHT cable from the CRT.
You may need to remove the bleed
assembly to
do
this - See MIM section
4.8.4.
-Inspect the EHT cable and bleed
assembly.
-Measurg the resistance of the EHT cable
from end to end (less than 25k ohm) and
resistance to ground (either end) (240M
ohm) .
Is all correct?
Y N
Q
R
044
-Exchange the bleed assembly.
GO TO MAP 0000, ENTRY POINT BB.
L M N
Q
R
333
L
-Exchange the analog
card~
Has the problem gone?
Y
I
;~~Change
the CRT.
GO TO MAP 0000, ENTRY POINT BB.
047
GO TO MAP 0000, ENTRY POINT BB.
048
GO TO MAP 0000, ENTRY POINT BB.
049
GO TO MAP 0000, ENTRY POINT BB.
050
-See MIM Chapter 5 to make necessary
adjustments.
GO TO MAP 0000, ENTRY POINT DB.
051
(Intensity Override
still
engaged).
-Check
the shape of
the
image.
TherQ
should be ..•
a) ... raster(s) of lines so closely
spaced that they nearly merge.
(Look
carefully
at
left and right hand
edges) .
b) ... the imagQ filling most of the
screen.
c) ... a blank edge at one side. at least.
Is the SHAPE correct?
Y N
052
-Release Intensity Override.
-Check adjustments of HEIGHT, WIDTH,
H.CENT, FOCUSl and FOC2 controls.
-See MIM section 5.3.4 and MIM section
5.3.5 and Figure
1-4.
IS the problem corrected?
r
i~3TO
MAP 0200, ENTRY POINT CC.
054
GO TO MAP 0000, ENTRY POINT BB.
55
GO TO MAP 0300, ENTRY POINT A.
04FEB81
HAP 0400-4
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