Daewoo TVZ 1321 Service Manual page 38

3-2) COLOR NOISE REDUCTION
Mode Adjustment parts
EE RY 91
Location of Adjustment Parts
Y/C PCB
PY05
RY91
IY02 IY01
PAY02
Y/C PCB SOLDER SIDE
• Adjustment Procedure
1. Preparation
1) Supply the Color bar signal to the VIDEO LINE IN JACK.
2) Supply 5V to PY05.
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(RY09) and CH2 to the YNR TP (PY05) and trigger the scope with the signal from CH1.
3) Adjust RY91 until Color signal becomes minimum.
Check point
PY09
PY09
IY03
PAY01
Test equipment
Signal gen.
Oscilloscope
Observation Waveform
Horizontal Axis : 10µS/DIV
Vertical Axis : 50 mV/DIV
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Test tape Input signal
Color Bar
CH-2(PY09(NR)
Horizontal:10µs/DIV
Vertical:50mv/DIV