Pioneer LD-V4300D Service Manual page 82

8 . TI LT SENSOR INCLINATION ADJUSTMENT
• Purpose: To set the electrical offset of the tilt servo to 0 V by adjusting the inclination of the tilt sensor.
• Symptoms when incorrectly adjusted : Crosstalk
Measurement equipment
& jigs
• Oscilloscope
• Test disc: GGV1003
• Philips (±) screwdriver
• Monitor TV
Adjusting procedure
Measurement equipment
connecting points
• Oscilloscope: In
FTSB
assembly
CHI : Between TPl-8
(TIL T ERROR) and GN
Note: This adjustment should be performed with the
unit placed horizontally.
This adjustment should be performed in the
range of F
#
(frame numbers) 2000 - 10000 so
the sensor output is not influenced by the mir-
ror surface at the inside of the disc and exter-
nal light at the edges of the disc.
I. Play the test disc and search for a position around
frame
#
5000 .
2.
Connect the oscilloscope to TPl-8 in the
FTSB
assem-
bly, and observe the DC voltage of the tilt error signal.
3. Insert the small Philips (±) screwdriver with a long shaft
Adjustment diagram
Player condition
#
Normal mode:
• Play mode
• Tilt servo OFF
Adjusting points
• Tilt sensor inclination
adjustment screw in the
pick-up assembly
from the rear panel of the player, and adjust the tilt
sensor inclination adjustment screw so that the DC
voltage of the tilt error signal becomes 0V ±20mV.
(Fig. 8-1)
At this time, the above adjustment will be easy to per-
form when the pickup is locked by pressing the Multi
Reverse key on the remote control.
4. Set "TIL T SERVO ON"" by remote controller.
5. Search for frame
#
I I 5 and check that crosstalk at the
left and right sides of the TV screen is minimum and
symmetrical.
NOTE:
Displaying "1
o·
for tilt error is not a fatal error. "TfL T
ERROR 10" will be displayed on the monitor when
TP1 -8 is 0V.
Oscilloscope
FTSB assembly
, ........ . ID
~
TP1
Q
@
0
•
Iii
DO
O
0
0
- - - - - . 0
raa
Fig . 8-1 Tilt stay inclination adjustment
113