Daewoo TVZ 1321, Service Manual

Page: 33 / 151

Location of Adjustment Parts Observation Waveform
MAIN PCB Horizontal Axis : S/DIV
Vertical Axis : CH1 : H/SW, CH2 : ENVELOPE
1. SERVO
1-1) X-path and P
2
, P
3
Adjustment
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.
ELECTRICAL ADJUSTMENTS
31
Item Mode Adjustment parts Check point Test equipment Test tape Input signal
X-path PLAY CONE SCREW PY09 Oscilloscope COLOR BAR
P
2
, P
3
P2, P3 PY05
DECK AS
CH2
CH1
MAIN PCB
PY09
PY05
Y/C
BOARD
RN90