Service manual
Table Of Contents
NOTE:
1702
locations in (
).
8
1
VOLTAGE - Inject a video signal
1701
(110V)
Regulate VR, R109, for
B1
adjustment so
that
Dc voltage between TP-91 and earth is
110
volts.
1702
(125V.)
Confirm
that
the voltage at TP-94 and IC901 pin 4 is
125
volts.
NOTE:
Meter should
be
periodically calibrated at
20K
ohms/volt.
FOCUS
Adjust
the FOCUS control for best overall definition and picture detail at normal brightness and contrast.
VERTICAL POSITION
Adjust
the V. center
VR
R428 (R429)
to
the optimum vertical picture position.
VERTICAL HEIGHT
AND
LINEARITY
1. Display a pattern which allows easy confirmation
of
symmetry
(such
as
a circle or crosshatch).
2. Reduce the vertical size
with
the
V.
HEIGHT VR.
3. Adjust the vertical linearity
with
the V. LIN. VR.
4. Readjust the vertical height, so
that
the picture extends
to
normal size.
HORIZONTAL WIDTH
Adjust
H.
WIDTH control coil
L503
(L522) by turning it
with
a hexagonal adjusting bar only
if
RIGHT
and
LEFT
sides
of
picture
can't
be
seen.
HORIZONTAL OSCILLATOR
1. Set the
H.
FREQ.
VR
to
the mechanical center position.
2. Connect a jumper clip between TP-33A and TP-33B.
3. While rotating the
H.
FREQ.
VR, R504, keep the picture stationary or
slowly
moving.
4. Remove the jumper wire.
5. Make sure
that
the set maintains horizontal sync, when signals are switched.
6