Electrical Adjustments; Adjustment Procedure - Daewoo TVZ 1321 Service Manual

ELECTRICAL ADJUSTMENTS

1. SERVO
1-1) X-path and P , P Adjustment
2 3
Item Mode
X-path PLAY
P , P
2 3
Location of Adjustment Parts
MAIN PCB
PY09
RN90
DECK AS
MAIN PCB

Adjustment Procedure

1. Preparation
1) Set the AUTO TRACKING to OFF using the Service REMOCON.
2) Play back the Test tape (DN-1:Color Bar)
3) Set the oscilloscope to the CHOP mode. Connect CHI to the H/W (PY09) and CH2 to the ENVELOPE (PY09) and
trigger the scope with the signal from CH1.
2. Adjustments
1) Adjust CONE SCREW to position to maximize the height of the ENVELOPE waveform.
2) Adjust P2 to position where the edge of ENVELOPE waveform are equal and symmetrical. Adjusting P3 is same to
P2's.
3. Remarks
1) After adjusting, Press this button twice. (so leds are off.)
2) Insert the tape into deck to confirm Autotracking.
3) If the picture appears soon after the tape has been threaded around the drum, adjustments are probably correct.
However if autotracking is repeatedly, operating, the adjustments are incorrect.
4) Refer to the illustration on page 23 for the location of p2, p3 and the cone screw.
Adjustment parts Check point
CONE SCREW
P2, P3
Y/C
BOARD
PY05
Test equipment
PY09 Oscilloscope
PY05
Observation Waveform
Horizontal Axis : S/DIV
Vertical Axis : CH1 : H/SW, CH2 : ENVELOPE
CH1
CH2
31
Test tape Input signal
COLOR BAR