Sony FD-42A - Horizontal Amplitude (H-SIZE) Adjustment; Vertical Amplitude (V-SIZE) Adjustment; Keystone Correction (KEYST) Adjustment; Horizontal Frequency (H-FREQ) Adjustment

Horizontal Amplitude (H-SIZE) Adjustment
1. Tune in an off-the-air signal.
2. Adjust RV852 for the best horizontal ampli-
RV852
Vertical Amplitude (V-SIZE) Adjustment
1. Tune in an off-the-air signal.
2. Adjust RV851 for the best vertical ampli-
RvV851
Keystone Correction (KEYST) Adjustment
FD-42A
4.7V Adjustment
1. Connect digital voltmeter to Q601 collector.
2. Adjust RV601 for 4.7V reading on digital
voltmeter.
digital
voltmeter
iat
=a
Q601 collector
RV601
— D BOARD —
RV502
1. Tune in an off-the-air signal.
2. Adjust RV502 for the optimum picture.
x Oo x
RV853 | _
as #
Rv4o1 | ~
Horizontal Frequency (H-F REQ) Adjustment
1. Short-circuit between ICSO1 pin a3) and
ground with jumper wire.
2. Connect the frequency counter to ICSO1 pin
6).
RV501
3.
Adjust
RV501
for
a
15,734
kHz
reading
on
fre-
quency counter.
4. After the adjustment, remove the jumper
wire in step 1.
frequency counter
ae
RV802
Focus Adjustment
. Set the regulated dc power supply voltage to
4.8V.
. Tune in an off-the-air signal.
. Adjust RV802 for the best focus at the center
of the picture.
FD-42A
Luminance (BRT) Adjustment
1. Bridge the pattern according to the mark on
the neck of the picture tube.
mark
pattern connection
(R871)
2.
Turn
BRT
knob
(RV853)
fully
counterclock-
wise
and
then
turn
CONTR
knob
(RV401)
fully
clockwise.
3. Connect the digital voltmeter across R860.
4. Adjust the RV802 for 9.0V dc reading on the
digital voltmeter. If not, disconnect pattern
connection @ and connect ® and adjust
again.
digital voltmeter
%
ia PUSH ON é