Philips MC-77/22 Service Manual page 49

1800 C1 2813 A5 2822 B5
2834 E4 2848
1801 I1 2814 B4 2828 C4 2836 D6 2851
2810 A5 2815 A4 2829 C5 2839 E8 2852
2811 A4 2816 B5 2830 C2 2843 E5 2855
2812 A4 2821 B4 2832 D5 2846 F4 2856
1 2 3
3DTC-mainboard
part 1
A
B
4u7
CD Drive
2830
C
VAM2201
1800
GND
1
D5
D3
2
D3
D5 3
D4
D2 VCC
4
VREF
5
D1
VrefCD10
D
LD 5V
6
MON 7 1.6V
D4 8 1.9V
D1 9
D2
10
GND
11
T+
12
E F-
13
F+
14
15
T-
FMZ-ST
Servo Driver
4.7V 16
+
FOCUS 14,15
F
_ 13
5V
4.7V
12
_
10,11
TRACK
+
5V 9
G
Motor Driver
5.1V + 16
H
DISC 14,15
1801
_
13
4.6V
1
Innersw
to 7800/pin63
INNERSW. 2
4.9V
3 12
+ _
DISC
4
_
SLIDE 10,11
5
_
SLIDE
+ 9
6 4.8V
+
I
PH-S
7803
1 2 3
10-7
F5 2859 H5 2864 I4 3810 A4 3821
F4 2860 B9 2865 I5 3813 A4 3829
B8 2861 H4 3807 A3 3817 B4 3830
G4 2862 H5 3808 A4 3818 B4 3831
G5 2863 H4 3809 A3 3820 B4 3833
4 5
3807 3808
D1 R2 (CD10)
22K 10K
3809 3810
R1 (CD10)
D5
22K 10K
3813
D4 (CD10)
10K
3817 3818
D4 D3 (CD10)
18K 10K
3820 3821
D3 D2 (CD10)
56K 10K
D2 3833
3831 D1 (CD10)
56K 10K
3851
D4
2K7
HF-Amplifier & Laser power control
3836
D3 7801
7
2.9V
4K7 LDON
PWRON
from part2 7800/pin64
6
3835
Σ (D2-D4) = Audio signal 2832
5 DIN
D2 0.8V
4K7 220n
3861
0.2V
4 MON
ESD sensitive line!
15K
2836 1V 3 CFIL
U >400mV
->Laser damaged !
4n7
3862
Focus search 2 VCCL
4.7V
+5V
Service step 2
4R7 1 LD
2.1V
+
2V
-
1s
3859
ESD sensitive line!
4R7
3812
BC847B
7806
10K
3869 3870
1 1.6V
+
33K
47K
FOCUS
2 1.6V 3V
-
Vref
3873 3899
10V
5
+10V
VDD 0V
2R2 2R2
3877 3878
6
+
1.6V
33K 47K
TRACK
7 1.6V
-
Vref
3,4,8
7802 TDA7073A
3V
0V
0V
100K
1 0.3V
+
3882
DISC
100K
- 2 0.3V
3885
3888
10V 3887
5
VDD +10V
2R2
2R2
6
Vref
+ 1.6V
SLIDE
3892 100K
7 1.6V
-
82K 3891
3,4,8
TDA7073A
3V
0V
4 5
B4 3835 D4 3856 D8 3869 F5 3876 B9
C2 3836 C4 3859 E4 3870 F6 3877 G5
C2 3846 F8 3861 D4 3871 F5 3878 G6
B4 3851 C4 3862 E5
3872 B9 3879 G5
B4 3855 D8 3864 E8 3873 F4 3882 H5
6 7 8
10V
+10V
5V
+5V
3,3V
+3,3V
3,2V
+3servo
1,6V
Vref
1.6V
VrefCD10
EYE-PATTERN
TB = 0.5µs/div
VrefCD10
TZA1024/TZA1025
3855 1K
CMFB
8
2x
1.6V
3856
RFFB
9
GND HF
0.9V
to 7800 on part 2
10K
4x RFEQO
10
1.7V
CDRW 11
1x
EQSEL 12 0V
VCC2 13 3.0V
RGADJ 14
V/I
V/I
+3.3V
FO
RA
A
B
M2
M1
SL
6 7 8
10-7
3884 H5 3890 I5 7801 D6
3885 H6 3891 I6 7802 G3
3886 A10 3892 I5 7803 I3
3887 H4 3899 F5
3888 H5 6812 F8
9 10
10V
+10V
5V
+5V
3,3V A
+3,3V
3886
33R
3872
1K
1.6V
VrefCD10
B
800mVpp
C
D
E
F
G
H
. . . V DC voltages measured in
PLAY MODE
I
with following conditions:
V EVM
"+10V" = 10V
"+5V" = 5V
3DTC Mainboard Sheet1 2001-02-01 (non CDR Version)
9 10