Marantz UD9004/U1B - Diagnostics of Optical Pickup and Replacing Fe Main P.w.b and Bd Mechanism Unit Assy

17
UD9004
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)
12345678910111213
T21-mmmm-nnnn
FL Display (The display part of 13 digits)
12345678910111213
T22-mmmm-nnnn
FL Display (The display part of 13 digits)
12345678910111213
T23-mmmm-nnnn
FL Display (The display part of 13 digits)
12345678910111213
T24-mmmm-nnnn
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):