Philips FW-C255 Service Manual page 15

CIRCUIT DIAGRAM - KARAOKE PART
1800 A1 2428 A9 2803 B3 2806 B5 2809 E2
1801 B9 2801 B2 2804 A4 2807 A5 2810 E3
1802 B8 2802 B3 2805 B4 2808 A6 2811 E4
1 2
+12V_A
A
MIC GND_A
1800
TC38
4
2
5800
7
22u
1
6
3
B
5
MIC
MIC
C
D
+12V_A
7803
E
BC847B
7802
BC847B
GND_A
1 2
6-4
2812 E5 2815 E7 2818 E7 3801 A1 3804 A3 3807 B4
2813 E5 2816 E7 3423 A9 3802 B2 3805 A3 3808 B5
2814 E6 2817 D7 3800 A1 3803 B3 3806 B3 3809 A5
3 4
SIMPLE KARAOKE
+12V_A
3805 2804
1M
470n
5.8V
3803 2802
7800
BC847B
10K
100n
0.7V
0V
2803
RK09D
1n
GND_A
MIC
# VCD
6800
3815 3816
150K 1K
1N4148
GND_A GND_A
3 4
3810 A5 3813 B7 3816 E4 3819 E5 3822 E7
3811 B5 3814 E3 3817 E5 3820 E6 3823 D7
3812 B6 3815 E3 3818 E5 3821 E6 3824 E7
5 6
+12V_A
3810 2808
MIC GND_A
1M
1u
8.9V
2805 3808
7801
BC847B
470R
470n
1.4V
0V
3807 GND_A
20K
GND_A
+12V_A
2811 3818
1M
100n
2812 3820 3821
7804
BC847B
10K 10K
1u
GND_A
5 6
6-4
5800 B2 7411 A9 7802 E2 7805 E7
6800 E4 7800 B4 7803 E2
6801 E4 7801 B5 7804 E5
7 8
1
3813
2
11.9V
+12V_A
470R
3
4
FE-ST-VK-N
GND_A
+12V_A
2817
680p
3822 2818
1M
100n
2815
7805
BC847B
1u
#
GND_A
7 8
9
MIC DETECT
MicDet
0V
3423
(TO SH 130-1)
7411
BC847B
10K
0.7V
A
D
TO COMBI
1802 # 1801 B
1
MIC_DET
2
+12V_A
3
MIC_SK
4
GND A
5
MIC_VCD
FE-ST-VK-N
C
D
E
SEE VARIANTS TABLE IN SH130-4
FOR PROVISION ONLY
9