Mono Carrier: Audio Amplifier (A8) - Philips L01.2A AB Service Manual

Circuit Diagrams and PWB Layouts
Mono Carrier: Audio Amplifier
1 2
A8 AUDIO_AMPLIFIER + MONO_SOUND_PROCESSING
AUDIO AMPLIFIER
A
MainAux
VlotAux+5V
Main_OutL
4901
A8-45
B
A9-45 FOR ITV ONLY
0271
A11-45
1
2
3
4
Main_OutR 4903
A9-46
C A11-46
3921
Treble_Buzzer_Hosp-app
A7-6
330K
A8-6
D
Volume|Mute
A7-15
E
MONO SOUND PROCESSING
2941
MONO|AM_MONO_SOUND
A5-43
10u
F
Bass_panorama
7941
A7-7 BC847B
G
Treble_Buzzer_Hosp-app
7942
A8-6 BC847B
1 2
L01.2A AB 7.
3 4 5
* 3901
9921 *
56K
*
4902
FOR ITV ONLY
* 3903 0275
15K
2911 2904
2n2 1u
*
4904
*
2906
3905
15K
1u
3922
330K
3923
330K
*
4941
+8V
2942 3941
470R
6n8
3942
6K8
3945 2946
7943
BC847B
1K8 1u
2945 3947
4n7 220R
(Mono sets only)
3 4 5
EN 25
6 7 8
6901
BAS216
*
7901
AN7522N 5 1
A1
2
5V2
1V4 6 CH1-IN
CH1+
4 5V2
CH1-
1V4 8 CH2-IN
CH2- 10 5V2
0V3 9 VOL
CH2+ 12 5V2
A4
3 7 11
*
7902
AN7523N 5 1
STB VCC
2
6 CH1-IN
CH1+
9 VOL 4
CH1-
GNDINP NC GNDCH1
7 8 3
WITH WITHOUT SNDPROC-
ITEM
STEREO STEREO SMART-MN-
15RF-AP
2941 1uF 10uF 1uF
2942 33nF --- 33nF
2943 100nF --- 100nF
2944 47nF --- 39nF
2945 10nF --- 4n7
2946 1uF --- 1uF
3941 100R --- 100R
3942 3K9 --- 4K7
3943 2K7 --- 2K7
3944 2K7 --- 2K7
3945 1K --- 1K
3946 18K --- 8K2
Main_OutL
3947 330R --- 10K
A8-45
3948 47K --- 47K
3949 15K --- 15K
3950 560R --- 560R
3951 390R --- 390R
4903 JUMPER --- ---
4941 --- JUMPER ---
7941 BC847B --- BC847B
7942 BC847B --- BC847B
7943 BC847B --- BC847B
---
9913 JUMPER ---
---
9914 JUMPER ---
A1 A2 A3
2V / div DC 2V / div DC
5us / div 500us / div
6 7 8
9 10
A2
0246
*
AmpOutL_Neg
5
*
9901
AmpOutL_Pos
4
*
9902
3
AmpOutR_Pos
A3
2
AmpOutR_Neg
1
SPEAKER
2 X 5W 16 ohm
2 X 3W 8 ohm
8 ohm
2 X 1W
* 0246
Of 0254
With Side AV + HP To
Without Side AV + HP
To Speaker
* 7901 7902
STEREO AN7522N
-
MONO AN7523N
-
SNDAMP- SNDAMP- 1X1 OR 1X1W-MN OTHERS
ITEM
ITEM
1X4W-MN- 2X3W-ST- 2X1W-NA
15RF-AP AP
2902 220uF/50V470uF/25V 1000uF/16V
2904 1uF 33nF
2906 --- 33nF
3903 10K 3K3
ITEM IC-AN7522N IC-AN7523N
3905 --- 3K3
2907 1nF ---
3906 --- 10K
7901 YES YES
7902 --- ---
SNDAMP-
ITEM
1X4W-MN- OTHERS
15RF-AP
2911 2n2 ---
SNDAMP- SNDAMP- SNDAMP- SNDAMP- SNDAMP- SNDAMP-
ITEM 1X1W-MN- 1X4W-MN- 1X4W-MN- 2x5W-ST- 1X4W-MN- 2X3W-ST-
NA CH IN L01MKII IN MKII NA/LA/AP
2908 10uF 10uF --- --- --- 10uF
SNDAMP- SNDAMP- SNDAMP- SNDAMP- SNDAMP- SNDAMP-
ITEM 2X1W-ST- INTF-ST- 1X4W-MN- 1X3W-MN- 1X4W-MN- 2X3W-ST-
NA IN LA/AP GL 15RF-AP NA
2908 10uF 10uF --- 10uF --- 10uF
A4
2V / div DC 2V / div DC
500us / div 500us / div
9 10
11 0246 B10
0271 B2
0275 B4
2901 A7
2902 A7
2903 A5
2904 B5
2905 B5
2906 C5
2907 C5
AmpOutR+
2908 D5
A12-70
2911 B3
AmpOutL+ A
2941 F3
A12-71
2942 E3
AmpOutL_Pos
2943 G4
A12-73
2944 G4
AmpOutR_Neg
2945 G4
A12-72
2946 F4
2947 C9
2948 C9
2949 C9
2950 C10
3901 A5
3902 A5
B
3903 B3
3904 B4
3905 C3
3906 C4
3907 D5
3921 C2
3922 C3
3923 D3
3941 E4
3942 F3
3943 F3
C
3944 F4
3945 F3
3946 G3
3947 G5
3948 F5
3949 G5
3950 F5
3951 G6
4901 B3
4902 A3
4903 C3
4904 C3
D
4921 A4
4941 E3
6901 A6
7901 A6
7902 C6
7941 G2
7942 G2
7943 F5
9901 B9
9902 B9
9921 A3
E
F
G
CL 265320082_008.eps
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