JVC TH-M55 Service Manual page 35

4.4 All-initialization method
Please perform all-initialization according to the following procedures in the following case:
• Just after you exchange the pick-up.
• Just after you exchange the spindle motor.
• Just after you exchange the traverse mechanism base.
NOTE:
Please perform all-initialization when you exchange the parts above and also when you remove the parts above.
• Just after the flap adjustment of the pick-up guide shaft.
(1) Set the main body at test mode.
(2) Press and hold "REVERSE SKIP" key of the main body for more than 1.5 seconds.
(3) When all-initialization is completed, "33" and "RDS" is displayed in the FL display.
(4) To release test mode, press "STANDBY/ON" key of the main body
NOTE:
After all-initialization, be sure to perform optimization adjustment of Front End parameter.
4.5 Optimization adjustment of Front End parameter
Adjustment to optimize Front End parameter must be performed in each mechanism assembly of this model for high-speed starting.
Please perform optimization according to the following procedures just after all-initialization is completed and when FL display shows
anything except "0" (For example when FL display shows "1", "2", and "3") at test mode
(1) Press "STANDBY/ON" key of the main body to turn the main body on (not to set the main body at test mode).
(2) Insert the test disc VT-501 or commercial dual-layer DVD software.
(3) Remove the disc when the FL display changes from "READING" to disc information.
(4) Perform the same procedures as in (2) and (3) above by using the test disc CTS-1000 or commercial CD-DA software.
(5) Set the main body at test mode, and check that the FL display shows "0".
NOTE:
Status of this adjustment can be judged by the number displayed at test mode as follows:
NOTE:
As for a disc used for adjustment,
• Disc should be mounted. ("Mounting" means to display "READING" after the disc is inserted and then display the disc infor-
mation.) Disc need not be played.
• If you do not have test disc either VT-501 (DVD) or CTS-1000 (CD-DA), use a commercial disc (for DVD, dual-layer soft-
ware) after seeing and checking that the disc is neither curved nor foreseen that it may shake at the time of playback. If you
use a disc with bad features, starting time may be slow or disc may not be read.
STANDBY/ON key
DVD adjustment CD adjustment
Adjusted Adjusted
Not adjusted Adjusted
Adjusted Not adjusted
Not adjusted Not adjusted
STOP key
(for test mode)
FL display
OPEN/CLOSE key
(for test mode)
FL display at test mode
0
1
2
3
REVERSE SKIP key
(for all initialize : It pushes 1.5 seconds or more.)
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