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4.4
-12 VOLT SUPPLY
This circuit consists of U4,
(see Appendix G),
a three-terminal
voLtage reguLator IC.
It suppLies - 12 VoLt DC (at pin 4, J4) to
the Logic board assembLy.
A horizontaL drive signaL is suppLied by the Logic board assembLy
to
pin
9 of J4.
This signaL drives Q3 and T1
which
in
turn
suppLy the driving signaL for the horizontaL ouput transistor QS.
QS, with its associated components, provide horizontaL defLection
and other operating voLtages for the CRT.
For the defLection functions,
L1 provides width adjustments,
L2
is
the Linearity correction coiL and C20 is the S-shaping
capa-
citor.
T2
is the fLyback transformer and is
voLtage
(+12 KV) for the CRT anode,
focusing voLtages for the tube.
The
ampLifier is aLso generated by T2.
6.0
VERTICAL DEFLECTION CIRCUIT
--------
----------
-------
used to generate
the
high
as weLL as the biasing
and
suppLy voLtage of the video
us
is an integrated vertical defLection circuit (see Appendix G).
A verticaL drive signaL is provided by the Logic board
assembLy
at pin 7,
J4.
This signal provides the vertical synchronization
signaL
required
by US.
The vertical defLection yoke is
driven
directLy by US and its associated circuitry. VRS provides adjust-
ment for raster height.
VR4 is used to adjust the hoLding
range
of the circuit.
VR3 is used to adjust verticaL Linearity.
The
video
signaLs generated by the Logic board
ass~mbLy
at
pin
10, J4 is ampLified by Q4 to the LeveLs required by the CRT.
VR6
is used to adjust the video contrast of the dispLay.
7.1
PROCEDURE FOR DISCONNECTING THE MONITOR/POWER SUPPLY PCB
(See
Figure
6:
System Wiring Diagram and Figure
0-1:
Loading
Diagram.)
1.
Disconnect
the
AC power cord from the AC
power
connector
Located at the rear of the terminaL.
2.
Disconnect
the
Logic board from the
monitor/power
board
by
separating
the 10-wire harness from
J3
monitor/power suppLy.
suppLy
of
the
monitor/power supply board 3-3
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