Bang & Olufsen DVD 1 MKII, Service Center Repair Manual

1.6

1.7

Repair tips

Picture

Poor picture

Dirt on lens

The laser lens must never be touched !

Refer to “Optical Disc Reference Book” for full description.
The “Optical Disc Reference Book” is available in the following languages:
English 

(Part no. 3540685)

, German 

(Part no. 3540686)

, French 

(Part no. 

3540687)

, Danish 

(Part no. 3540688)

, Italian 

(Part no. 3540689)

, Spanish 

(Part no. 

3540690)

, Nederland 

(Part no. 3540691)

Dirt/defect disc
Refer to user guide for cleaning the disc.

Pixel error or frozen picture is typically due to DVD mechanism failure.

Repair Tips, English

Summary from Optical Disc Reference Book

Optical unit

The optical unit, also called the OPU - 

O

ptical 

P

ick-

U

p Unit - with actuator, laser 

optics and belonging electronics is the single most expensive and delicate part of 
the DVD mechanism. It is especially the OPU which must be protected against 
unintentional contact, dust or other pollution during storage, transport, 
production and service.
Furthermore, special care must be taken to prevent 

E

lectro

S

tatic 

D

ischarge (ESD).

The laser lens must never be touched!

The actuator (the motion mechanism for the lens/mirror system) has together 
with the complete OPU been adjusted by the supplier. The adjustment is fixed 
and is not supposed to be readjusted. Please also take note that the actuator 
includes magnets which may attract iron particles from screw-cuttings etc. and 
this may detriment the function of the actuator. Furthermore, please avoid that 
other magnets, in for instance loudspeakers or magnetic screw drivers get into 
close contact with the OPU. The OPU which has been adjusted individually 
together with the mechanism itself cannot be readjusted, repaired or replaced.

Cleaning and test of the OPU

Because of the design of the lens it can be very difficult to determine whether 
the lens is dirty, therefore always clean the lens when servicing. A finger print on 
the lens will, like dust and other contaminants affect the performance of the  
lens negatively. If a contamination has taken place the lens can be cleaned with 
care. Loose particles usually can be removed with air (use e.g. a blower brush for 
camera lenses). Finger prints etc. can be removed with a special cleaning fluid - 
“Kodak Lens Cleaner CAT 176 71 36” - on a cotton bud (e.g. of the ESD safe 
wooden type). 
Clean the lens by dipping the cotton bud “Kodak Lens Cleaner CAT 176 71 36” 
and carefully wipe it with circular movements. Remove the moisture on the lens 
with the dry end of the cotton bud.