Sony Trinitron KV-27TS35, Service Manual

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5-1. A BOARD ADJUSTMENTS
SECTION 5
CIRCUIT ADJUSTMENTS
IF 201
[RF ACC ADJUSTMENT1
5-2. B BOARD ADJUSTMENTS
B board
A board
CONTRAST ADJUSTMENT ( RV
1 . Receive a color-bar signal.
PICTURE. MAX
. . __
. . . . _____
SHARP----- NORMAL
2. Connect an oscilloscope to the TP 47 R(R OUT).
3 . Adjust RV 301 (SUB CONT) so that voltage is
3.4 to.2 vp-p.
1. Receive an off-air signal.
2. Adjust AGC VR (AGC VR of 201) so that
snow noise and cross-modulation just disappear
from the picture.
LEVEL ADJUSTMENT RV 205
1. Receive 400 Hz (100% modulation) sound signal.
2. Connect an RMS meter to pin
of MM 201.
3 . Adjust RV 201 so that the MPX level is 247.5
17.7
247.5
[H. FREQ ADJUSTMENT RV 250
1. Receive an off air signal.
2 . Short circuit between TP (Y SYNC) and TP (12
V) with a jumper wire.
3 . Connect the frequency counter to pin@ of
connector A-3.
4. Adjust RV 250 for 15.734 Hz on the
frequency counter.
5. Disconnect a jumper wire from TP (Y SYNC)
and TP (12 V).
white
BALANCE ADJUSTMENT (RV
1. Input 400 Hz 200 signal.
2. Adjust RV 1400 (SUB-BALANCE) so that the
output level of pin B-4 connector and pin B
-2 connector to be the same level.