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A
2 DVD Error Rate Adjustment
Notes: · Use disc: GGV1025
· Play the DVD test disc at inner track (around #30000)
START
· Play the DVD test disc at inner track · Display ERROR RATE on the monitor
B
ESC CHP/TIM
G N
Traverse Mechanism Assy-S Adjust the radial adjustment screw so that ERROR RATE becomes around "5E-4". A ERROR RATE : "5E-4"
Traverse Mechanism Assy-S Fasten the radial adjustment screw so that ERROR RATE becomes around "1E-3". B ERROR RATE : "1E-3"
1E-3
ERROR RATE
C A A
B
5E-4
· Unfasten the radial adjustment screw by 90 degrees step till ERROR RATE becomes around "1E-3" again . C · Record the number of rotation (N1).
(memorizing how much the screw was rotated.)
Best point
C
Anticlock wise Clock wise Rotation of Radial screw and Tangential screw
· Fasten the radial adjustment screw till the number of rotation becomes harf of N1. Best Radial point
ERROR RATE: - - - -
ESC
Player Monitor
D
Service mode end
· Play the DVD test disc at outer track (around #200000) Service mode
ESC CHP/TIM
Turn the POWER OFF in case of NG once, and perform the adjustment once again.
If error rate is OK, locks a root of tangential and radial adjustment screws with
E
CHECK
OK
In this check, the error rate that is less than "5E-5"is better.
the Screw tight. Screw tight: GYL1001
Traverse Mechanism Assy-S Fasten the tangential adjustment screw so that ERROR RATE becomes around "1E-3". B ERROR RATE : "1E-3"
Disc playback normally. · The measurement of block error rate
ESC CHP/TIM
F
ESC
· Unfasten the tangential screw by 90 degrees step till ERROR RATE becomes around "1E-3" again . C · Record the number of rotation (N1).
Service mode end
· Fasten the tangential adjustment screw till the number of rotation becomes half of N1. Best tangential point
