Denon DVM-4800 Service Manual page 6

2.2 Cautions to Be Used Before Replacing the Optical Pickup Unit
and Spindle Motor Assembly
Before replacing the optical pickup unit and spindle motor assembly, check the total using hours for each of them.
The checking method is as follow:
Using hours of CD laser
Using hours of DVD laser Press "PAUSE, FWD-SKIP" and "5" on the
Using hours of SP motor
Resetting using hours
of CD and DVD lasers
(Simultaneous resetting)
Resetting using hours
of the motor
Cautions to be taken when replacing the optical pickup
The optical pickup may break down due to the static electricity of human body. Take proper protection measures against static
electricity before repairing the parts around the optical pickup. (See the page describing the PREVENTION OF STATIC
ELECTRICITY DISCHARGE.)
1. Do not touch the areas around the laser diode and actuator.
2. Do not judge the laser diode with a tester. (The tester will be damaged easily.)
3. It is recommended to use a destaticized soldering iron for short-circuiting or removing the laser diode.
(Recommended soldering iron) HAKKO ESD Product.
4. Solder the land of the flexible cable in the optical pickup.
Note:
• When using a soldering iron which is not destaticized, short-circuit the terminal face of the flexible case with a clip.
After that, short-circuit the land.
• After the repairing work is completed, remove the solder according to the correct procedure shown in this Technical
Guide.
Optical pickup unit
Operating state & Key operation
Press "PAUSE, FWD-SKIP" and "5" on the
remote control in this order while the unit
is stopped
remote control in this order while the unit
is stopped
Press "PAUSE, FWD-SKIP" and "6" on the
remote control in this order while the unit
is stopped
While displaying Timer 1 data, press STOP
and FWD-SKIP buttons on the player, and
"5" button on the remote control unit
While displaying Timer 2 data, press STOP
and FWD-SKIP buttons on the player, and
"6" button on the remote control unit
Flexible cable
Display
T1_xxxx_yyyy: total hours are
displayed by 4-digit figures (unit: 10 hours).
yyyy: CD laser Time
T1_xxxx_yyyy: total hours are
displayed by 4-digit figures (unit: 10 hours).
xxxx: DVD laser Time
T2_xxxx: total hours are
displayed by 4-digit figures
(unit: 10 hours).
T1_0000_0000
T2_0000
Ground with a clip.
DVM-4800
6