10-2
In case of symptom „skipping tracks“ perform
following actions:
1. VERIFY THE COMPLAINT
PLAYABILITY CHECK
Use CDDA SBC 444A: . . . . . . . . . . . . . .4822 397 30245
TR 14 (600µ black dot) maximum at 01:15
TR 19 (fingerprint)
TR 10 (1000µ wedge)
Use CD-RW Printed Audio Disk . . . . . . .7104 099 96611
TR 3 (Fingerprint)
TR 8 (600µ black dot) maximum at 01:00
• playback of all these tracks without audible disturbance
• jump forward/backward within a reasonable time
2. CLEAN THE LENS
CD DRIVE – LENS CLEANING
Because the material of the lens is synthetic and coated
with a special anti-reflectivity layer, cleaning must be
done with a non-aggressive cleaning fluid. It is advised to
use “KODAK LENS CLEANER CAT 176 71 36”, available
in normal photo shops.
The actuator is a very precise mechanical component
and may not be damaged in order to guarantee its full
function. It is advised to clean the lens gently (don’t press
too hard) with a soft and clean cotton bud moistened with
the special lens cleaner.
The direction of cleaning must be in the way as indicated
in the picture below.
3. MEASURE THE EYE-PATTERN SIGNAL
EYE-PATTERN SIGNAL – JITTER MEASUREMENT
Measure the signal direct on resistor 3898 using an
oscilloscope (see also chapter 10-9).
See below examples of the signal. Amplitude should read at
least 700mVpp using SBC444A.
good
bad
If the oscilloscope shows a signal like the ‘bad’ one, and/or
the amplitude decreases within 1minute - the CD drive has
to be replaced.
INTERFACE
VERSATILE
END
FRONT
HF-Amplifier
from 1801
to 7801
D
D
D
D
D
D
D
D
D
D
D
D
1%
7803
BC847C
3900
100R
3970
3971
10K
1K0
V1
61
V4
62
V5
5 VDDA1
4 VSSA1
63
3 ISLICE
64
LDON
2 HFIN
HFREF
1
6 IREF
22K
3836
3906
470R
470n
2884
3903
2K2
2K2
3904
BC847B
7877
BC847B
7881
2882
82p
2883
470n
470R
3905
2K2
3908
820R
3902
390R
3907
BC847B
7878
R
2813
6n8
3909
100K
220u
2876
2816
22n
150p
2815
3895
33K
3899
10K
2817
4u7
3898
180R
3n3
3897
33K
2814
100R
3896
+3.3V
InnerSW
STBY
V_HF
+3.3V
HFIN
EYE-PATTERN
TB = 0.5
µ
s/div
800mVpp
for CD_DA : 0V
for CD_RW: 3V
1,5V
1,5V
1,5V
1,7V
0,7V
1V
2,1V
2,1V
SIGNAL PROCESS
Before touching the lens it is advised to clean
the surface of the lens by blowing clean air over
it in order to avoid that little particles make
scratches on the lens.
Service Hints
Summary of Contents for EMOTIVE Micro MZ-1000
Page 34: ...8 10 TECHNICAL REMARKS ...