Daewoo TVZ 1321 Service Manual page 37

3. VIDEO
3-1) Y NOISE REDUCTION
Mode Adjustment parts
EE RY 34
Location of Adjustment Parts
Y/C PCB
PY05
RY34
IY02 IY01
PAY02
Y/C PCB SOLDER SIDE
• Adjustment Procedure
1. Preparation
1) Supply the MULTI BURST signal to the VIDEO IN JACK.
2. Adjustment
1) Set the VCR to the STOP(EE) MODE.
2) Set the Oscilloscope to the chop mode.
Connect CH1 to the V-OUT(PY09) and CH2 to the CNR TP(PY05) and trigger the scope with the signal from CH1.
3) Adjust RY34 to minimize the 3.58MHz Y component of the MULTI BURST signal becomes less than [20]mVp-p.
Check point
PY05, PY09
PY09
IY03
PAY01
Test equipment
Oscilloscope
Signal gen.
Observation Waveform
Horizontal Axis : 10µS/DIV
Vertical Axis : 20 mV/DIV
35
Test tape Input signal
Multi Burst
with 3.58 MHz
CH-2 (PY05YNR)
Horizontal:10µs/DIV
Vertical:20mv/DIV