Circuit Adjustments; A Board Adjustments; B Board Adjustments - Sony KV-27TS35 Service Manual

5-1. A BOARD ADJUSTMENTS

IF 201
[RF ACC ADJUSTMENT1
1 . Receive an off-air signal.
2 . Adjust AGC VR (AGC VR of IF 201) so that
snow noise and cross-modulation just disappear
from the picture.
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 f
17.7 mVrms.
[H. FREQ ADJUSTMENT ( RV 250 1
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 kHz -L60 Hz on the
frequency counter.
5. Disconnect a jumper wire from TP (Y SYNC)
and TP (12 V).
SECTION 5

CIRCUIT ADJUSTMENTS

5-2. B BOARD ADJUSTMENTS

A board g
1 . Receive a color-bar signal.
2 .
3 . Adjust RV 301 (SUB CONT) so that voltage is
3.4 to.2 vp-p.
247.5 +17.7mVrms
1 .
2. Adjust RV 1400 (SUB-BALANCE) so that the
CONTRAST ADJUSTMENT ( RV 3011
P I C T U R E . MAX
. . .._ __ Mm
_____
SHARP----- NORMAL
Connect an oscilloscope to the TP 47 R(R OUT).
white
Input 400 Hz 200 mVrms signal.
output level of @ pin B-4 connector and 0 pin B
-2 connector to be the same level.
B board