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VIDEO MAP
PAGE
4 OF
4
036
(ENTRY POINT BSl
-(Do not use Intensity Override.)
.You may have:
a) screen too
DIM
or
BRIGHT
b) brigl,tness not variable
c) limited brightness or brightness does
not change smoothly L.Jhen control turned
from minimum to maximum
d) screen BLANK
Were you sent here for any of the above
problems?
Y N
037
You may have a color balance or purity
problem.
-Go to the adjust instructions (MIM
Chapter
5).
-If
necessary
adjust the purity controls
(MIM section 5.3.2) to make the color
the same allover the screen.
oIf necessary adjust the color balance
contoIs (MIM section 5.3.6) to make
whit·!.
A,'e the purity and color balance
correct?
Y N
038
IS it II purity problem?
Y
I
i~9TO
PAGE 2. STEP 008.
ENTRY POINT CC.
040
.Switch power OFF
~
.
• See Figure 1-2 and Figure 6-15 to
verify the degauss coil and its plug
(P271.
The degauss coil should measure 15 -
20 ohms .
• Verify the continuity of the purity
coils from amplifier card P19 - see
Figure 3-2
and Figure
1-4.
Each coil should measure between 130
and 17 0 ohms.
Are all coils good?
Y N
041
-Exchange the failing coil assembly.
-If the problem remains, exchange
the CRT.
GO TO MAP 0000. ENTRY POINT BB.
042
-Check the amplifier card fuse and
exchange
if
necessary.
-If the problem remains, exchange the
amplifier card then the CRT.
GO TO MAP 0000. ENTRY POINT BB.
043
GO TO MAP 0000. ENTRY POINT BB.
MAP 0300-'1
I
044
.Meter -150V (±20V) supply. from the
analog card (P4-43).
Use the
potentiometer mounting plate as ground.
-If voltage is bad, switch power OFF
~
and
exchange the analog card.
-Switch power OFF
~.
-See Figure 6-7 for the connections to the
brightness potentiometer and the
Intensity Override switch.
-Check continuity of the wiring from these
controls to the analog and amplifier
cards.
Repair or exchange as necessary.
eReseat the analog card.
-Reseat P15 on video card - see Figure 1-4
-if
no problem found, exchange the analog
card (then the amplifier card, then the
video card),
GO TO MAP 0000. ENTRY POINT BB.
04FEB81
MAP 0300-'1
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