Marantz UD8004, Руководство по обслуживанию, Страница: 16 / 148

12
DIAGNOSTICS OF OPTICAL PICKUP
AND REPLACING FE MAIN P.W.B AND BD MECHANISM UNIT ASSY
s
Make failure diagnostics of the Optical Pickup as follows.
q
If the laser drive current (Iop) becomes more than ±12[mA] of the initial value, the Optical Pickup should be replaced.
The laser drive current initial value is checked by "Iop checked Method" of next page.
w
Loadfivetimesoffollowingdiscagainandplayingitforoneminute.ItbecomestheaimoftheOpticalPickup
exchange when it cannot play.
BD-RE ABD-RE540W(made by ALMEDIO)
In case of replacing the Pickup, change the whole part of the FE Main P.W.B and BD Mechanism Unit Assy.
No mechanical adjustment is necessary after the replacement.
Laser drive current initial value:
FL Display (The display part of 13 digits)
CD :
1 2 3 4 5 6 7 8 9 10 11 12 13
T 2 1 - m m m m - n n n n
FL Display (The display part of 13 digits)
DVD :
1 2 3 4 5 6 7 8 9 10 11 12 13
T 2 2 - m m m m - n n n n
FL Display (The display part of 13 digits)
BD(SL) :
1 2 3 4 5 6 7 8 9 10 11 12 13
T 2 3 - m m m m - n n n n
FL Display (The display part of 13 digits)
BD(DL) :
1 2 3 4 5 6 7 8 9 10 11 12 13
T 2 4 - m m m m - n n n n
Disc no read, unsteady playback, etc.
Laser drive current (Iop) check.
HF wave form check.
(Refer to WAVE FORMS)
FE Main P.W.B and BD Mechanism Unit
Assy replacing.
Current value of the BD, DVD or CD IOP
is ± 12[mA] or more the initial value.
q
Check the laser drive current value
Disc no read, unsteady playback, etc.
ABD-RE540W disc playability check.
(Loadfivetimesoffollowingdisc)
Disc cannot play.
FE Main P.W.B and BD Mechanism Unit
Assy replacing.
w
Check the playability disc