Pioneer DV-470-S Service Manual page 49

5
DVD Error Rate Adjustment
2
Notes:
• Use disc: GGV1025
• BER:Block Error Rate
START
• Play the DVD test disc
at inner track
• Display BER on the monitor
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
the Screw tight.
OK
Screw tight: GYL1001
Disc playback normally.
• The measurement of
block error rate
ESC
5
6
Mechanism Assy
Adjust the radial adjustment
screw so that
BER becomes under "5E-5".
BER : under "5E-5"
BER : - - - -
Player
CHECK
Confirm that the error rate is
under "5E-5".
CHP/TIM
Service mode end
DV-470-S
6
7
• Play the DVD test disc
at inner track
(around #30000)
• Unfasten the radial adjustment screw
by 90 degrees step till BER becomes
over "1E-3" again .
• Record the number of rotation (N1).
• Fasten the radial adjustment screw
till the number of rotation becomes
harf of N1.
ESC
Service mode end
• Play the DVD test disc
Monitor
at outer track
(around #200000)
• Unfasten the tangential screw
by 90 degrees step till BER becomes
over "1E-3" again .
• Record the number of rotation (N1).
ESC
• Fasten the tangential adjustment screw
till the number of rotation becomes
harf of N1.
7
8
Mechanism Assy
Fasten the radial
adjustment screw so that
BER becomes over "1E-3".
BER : over "1E-3"
\ Service mode
ESC CHP/TIM
Mechanism Assy
Fasten the tangential
adjustment screw so that
BER becomes over "1E-3".
BER : over "1E-3"
8
A
B
C
D
E
F
49