Electrical Adjustments; Servo - Daewoo DVN-14F6N 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
Adjustment Procedure
1. Preparation
1) Set the AUTO TRACKING to OFF using REMOCON.
2) Play back the Test tape (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. Adjustment
1) Adjust CORN SCREW to position to maximize the width of the ENVELOPE pluse.
2) Adjust P2 to position which the edge of ENVELOPE signal has equal degree to the body of ENVELOPE signal.
Adjusting P3 is same to P2's.
3. Remark
1) After adjusting, press stop button to eject the tape.
2) Insert the tape into deck to confirm Autotracking.
3) If Normal screen is showed up as soon as it is start to play, adjustment becomes good.
If not, Adjust repeatedly to operate autotracking.
4) To know P , P , and CORN SCREW, refer from 'The schematic diagram of tape transporting system' on page 23
2 3
Adjustment parts
CORN SCREW
P2, P3
Y/C
BOARD
PY05
DECK A'S
MAIN PCB
Check point Test equipments
PY09 Oscilloscope
Horizontal Axis : S/DIV
Vertical Axis : CH1 : H/SW, CH2 : ENVELOPE
29
Test tape
DN-1
Observation Waveform
Input signal