Diagnostics Of Optical Pickup - Denon DBT-1713UD Service Manual

DIAGNOSTICS OF OPTICAL PICKUP

Make failure diagnostics of the Optical Pickup as follows.
q If the laser drive current (Iop) becomes more than BD : ± 6 [mA], DVD or CD : ±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 Load five times of following disc again and playing it for one minute. It becomes the aim of the Optical Pickup
exchange when it cannot play.
In case of replacing the Pickup, change the whole part of the MAIN PCB & BD MECHA or BD MECHA.
No mechanical adjustment is necessary after the replacement. (HOW TO REPACE THE MAIN PCB & BD MECHA OR
THE BD MECHA (page 17))
CD :
DVD :
BD(SL) :
q Check the laser drive current value
Disc no read, unsteady playback, etc.
Laser drive current (Iop) check.
The MAIN PCB & BD MECHA
or the BD MECHA replacing.
BD-RE ABD-RE540W(made by ALMEDIO)
Laser drive current initial value:
FL Display (The display part of 13 digits)
1 2 3 4
T 2 1 : m m m m : n n n n
FL Display (The display part of 13 digits)
1 2 3 4
T 2 2 : m m m m : n n n n
FL Display (The display part of 13 digits)
1 2 3 4
T 2 3 : m m m m : n n n n
Current value of the BD Iop is ±6[mA],
DVD or CD Iop is ±12[mA] or more the
initial value.
5 6 7 8 9 10 11
5 6 7 8 9 10 11
5 6 7 8 9 10 11
w Check the playability disc
Disc no read, unsteady playback, etc.
ABD-RE540W disc playability check
(Load five times of following disc)
The MAIN PCB & BD MECHA
or the BD MECHA replacing.
15
12 13
12 13
12 13
Disc cannot play.