Denon DVD-A1UDCI, Service Manual

Page: 15 / 175

15
DVD-A1UDCI
DIAGNOSTICS OF OPTICAL PICKUP
AND REPLACING FE MAIN P.W.B AND BD MECHANISM UNIT ASSY
Make failure diagnostics of the Optical Pickup as follows.
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.
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)
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)
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)
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)
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.
CD:
DVD:
BD(SL):
BD(DL):