Tangential Adjustment - Pioneer CJ-V55 Service Manual

CJ-V55
Step
No.
Oscilloscope Setting
Test Points
Adjusting
Points
Check items/
Adjustment Adjustment procedure
V
H
specifications
7 , TANGENTIAL ADJUSTMENT |
• Set the TEST disc.
• Set to Service mode.
• Shift the pickup close to the center of the disc by
pressing 1- MULTI-SPEED+1 kev + [31.
• Press l-MU. _,TI-SPEED+1 kev + 111. 1-MULTI-SPEED+1
kev+121 and 1 - MULTI-SPEED+1 kev +131 seouentiallv.
200nsec
/div
TP1
Pin 1'
(RF
output)
Tangential
adjustment
screw
Best eye pattern
and close all the servos. (Pause indicator lights up.)
• Observe pin 1 RF (RF output) of TP1 with an
oscilloscope and adjust with the tangential screw so
that the eye pattern becomes clear. (Fig. 7-9 and 7
-10)
• The adjusting point is the middle point between the
point where the eye pattern becomes deteriorate by
turning the tangential screw clockwise and the point
where the eye pattern becomes deteriorate by
turning the tangential screw counterclockwise. As a
criterion, observe that the overall waveform is clear
and one of the diamond shapes within the eye pattern
(Photo. 7-7). and adjust at as an optimum point
where the diamond shape is seen relatively fine line.
[___ |
Pin 1 (RF) t>j-
Pin 4 CGND)
Fig. 7-9
Note : During the adjustment, hold hexagonal wrench to
upward so as to keep the pickup body not goes
down.
Tangential adjustment
Pickup Base plate
Fig. 7-10 Tangential adjustment
97