Marantz CM6200/F1N, Service Manual

Page: 31 / 63

2-10
Rotating the loading motor forcibly
The loading motor can be rotated forcibly by rotating the
FF[
]/REW[ ] button while STOP or EJECT in the test
mode appears on the display.
Magnetic head mounting position check
• Check the mounting position whenever the magnetic head
and the optical pickup are replaced.
• Move the optical pickup to the center to adjust the position
easily.
1. Set the transparent disc for checking the head.
2. Press down the magnetic head up shift arm by hand to
raise the magnetic head.
3. View the set from above to check whether the magnetic
head aligns with the optical pickup objective lens.
4. Check that the magnetic head moves up and down
smoothly.
Figure 10-2
Figure 10-3 Optical Pickup Grating Deviation
Measuring Method
Mechanism Adjustment
1. Optical pickup grating adjustment
When the optical pickup is replaced, grating adjustment is
needed after auto adjustment. Then back to the auto pre-
adjustment and adjust again in numerical order
After auto adjustment (COMPLETE appears) in the test
mode (auto) using the high refl ection MD disc TGYS1, adjust
the Lissajou's waveform (x-y) of EOUT to FOUT.
1. Slightly loosen the 3 screws of the spindle motor, adjust
while observing the Lissajou's waveform.
2. After adjustment, tighten screws 1,2, and 3 in numerical
order. (See Fig. 10-4)
Figure 10-4
It is lowered
by hand.
(B1)x1
Ø
1.7x 5mm
Magnetic head up shift arm
Down
Magnetic head
Objective
lens
Radiai
Tangential
direction
Optical Pickup
OSILLOSCOPE
GND CH1 CH2
X Y
4 Pin of IC1201
GND (TP1202)
11 Pin of IC1201
EIN (TP1253)
12 Pin of IC1201
FIN (TP1254)
100K
470P
470P
a
b
LISSAJOUS'S WAVEFORM
Less than a:b = 4:1
100K
2
3
1
2
3
1
Adjusting
hple
Check the Lissajou's waveform
shifting the mounting position with
a screwdriver (to be fitted into the
disc motor adjusting hole).