Fostex CR200 Service Manual page 19

4.2.3 Coarse Skew Adjustment
• Objective
• Symptom when out of adjustment
• Measurement instrument connections Oscilloscope to CN204, Pin-1 (RF)
• Disc
• Player state
• Adjustment location
CAUTION:
Before executing this adjustment, you must cut a few wire binders, disconnect cable and loosen 4 screws so that the
HEAD BOARD assy can be tilted up and fixed into the slits.
[ Procedures ]
(1) Move the pickup to the position where the radial/tangential adjustment screws will be seen with the MANUAL / TRACK
SEARCH FWD or REV keys so that the radial/tangential adjustment screws can be adjusted.
(2) Press the FINALIZE key and the PLAY key in the order to close the focus servo and then the spindle servo.
(3)
Adjust the RAD (radial direction) and TAN (tangential
direction) adjustment screws alternately with hexagonal
screwdriver (1.27 mm diagonal) to maximize the RF output at
CN204 (TP201), Pin-1.
NOTE:
Radial direction and tangential direction
mean the direction relative to the disc
shown in Fig. 11.
Radial direction
Disc
Fig. 2
To coarse adjust the angle of pickup to the disc for performing the grating and
DPP (tracking offset) adjustments correctly.
Sound is cracking, some discs can be played but not others.
GND probe can be connected to CN204, Pin-4 (AGND).
[ Settings ]: 20 mV/div., 200 nS/div., AC mode
TCD-785
Test mode, focus and spindle servos: closed, tracking servo: open
Radial adjustment screw and tangential adjustment screw
Tangential direction
(SERVO UCOM BOARD assy)
Radial
adjustment
screw
Tangential
adjustment
screw
Fig. 11
Hexagonal
screwdriver
CR200
19