Philips AZ 2785 Service Manual - Page 18
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Also for Philips AZ 2785: User Manual (47 pages), Specifications (2 pages), Specifications (2 pages), (Spanish) Manual Del Usuario (19 pages)
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TUNER BOARD ECO5 - CIRCUIT DIAGRAM
1
2
3
4
A
Telescopic
antenna
Service Solution for
Local/DX - switching
B
remove
1105
T002
9100
6101
2105
100p
A
BA484
C
MW/LW-RF
P0
AM FRAME AERIAL
D
1103
T005
2
T006
1
5102
MW
6
E
2
w
5
3108
w
LW=high
7104
2k2
1
BC338-40
3
4
B
LW
F
P0
w
w
5103
7105
4
3
BC338-40
2
MW=high
6
1
G
H
I
J
K
L
M
N
1
2
3
4
PCS 104 456
8-1
5
6
7
8
9
2104
100p
C
T009
to 3103
REF
FM-RF
REF
2129
100u
2165
Q-MULTIPLIER
100n
7102
2SA838B
9101
5131
F
6105
2
1
7
3101
MW
HN1V02H
33k
s_5k6
Vcc1
FM-OSCILLATOR
3110
47R
VCO
3142
100k
1
5
r
7103
BC858C
r
3176
1k
AM-OSCILLATOR
T011
3132
4108
Vdd
Vdd
47R
w
7109
w
3125
10k
P0
w
BC858B
w
3128
7122
LW=high
2k2
BC848C
5
6
7
8
9
10
11
12
13
AM-IF1
5111
T046
4
3
450 kHz
E
6
1
z
5113
2
T013
FM-IF1
x
SFU450B
5109
4104
T014
t
3104
7119
180R
2SC1047
0.15V
0.7V
1.4V
1.4V
1V
1.4V
0.7V
1.4V
0.7V
44
43
42
41
40
39
38
37
36
AM Det.
RF-GND
V
A
STAB
T043
2.1V
1
Ripple
AM IF
AGC
FM
AM
AM
IF1
0V
2
AM-RF
Frontend
MIXER
AM
CONTROL
IF
AGC
0V
3
FM-RF
AGC
AM
FM
OSC
IF2
FM
4
Frontend
RF-GND
FM
MIXER
0V
5
FM-OSC.
FM
OSC
Pre-
Multi-
scaler
plexer
AGC
AM
6
0V
AM-OSC.
DET
V
A
V
B
STAB
STAB
Ripple
T040
7
FM
3.3V
Vcc1
V
STABILIZER
dd
DET
Vcc2
8
I-TUNE
Charge
Pump
3141
1.3V
9
TEA5757
VCO
7101
56k
z_TEA5759
1V
T012
10
0.7V
AF-Out
Mono/
STEREO
Stereo
2127
AFC
11
1.2V
MPX-IN
DECODER
220n
IF GND
12
0.8V
13
0.7V
14
0.7V
15
0.7V
16
1V
17
18
1V
19
1.2V
20
1.2V
0.1V
(2140)
2164
5119
4
3
470n
Vcc1
2
2
6
1
2140 exchanged by 2164
r
3144
(SMD type 0805)
3140 and 5120
1k
MPX
from layout stage 3317.9 onwards
DISCRIMINATOR
to 1121
provisional as
respectively 3103 303 3380.1
buffer amplifier
alternative
and 3103 308 3396.1
5123
MW
4
3
2
u
6
1
9117
w
w
5122
LW
7124
4
3
BC848C
w
3137
2
22k
P0
6
1
MW=high
10
11
12
13
8-1
14
15
16
17
18
VERSION PROGRAMMING COMPONENTS
AM-IF2
5112
3
4
450 kHz
/00 FM/MW/LW
1
6
/00 FM/MW/LW/SW-Eu
/01 FM/MW-Stereo
2
z
z
3175
3175
/01 FM/MW
AM-IF
AM-IF
to 1130,1131
to 1130,1131
2k7
2k7
AM Stereo module
AM Stereo module
/01 FM/MW/SW-Ov
/06 FM-Japan/MW-stereo
FM-IF2
5110
/13 FM/MW-Stereo
/14 FM-OIRT/MW/LW
T047
/14 FM-OIRT/MW
0.7V
1.4V
/17 FM/AM-Stereo
35
34
/17 FM/AM
V
B
STAB
5114
/.. FM/MW/2xSW
33
0.7V
3
FM-IF2
AM-AFC
/15 FM/MW/SW-Eu
450 kHz
T015
32
1.4V
1
AM-AFC
T037
P1
31
P1
x
2161
Programmable
Output Ports
T032
100n
P0
30
P0
x
2163
3161
T020
100n
29
Write
CONTROL
470R
Enable
3160
T021
DATA
28
470R
3159
T022
470R
27
CLOCK
T023
26
Dig.GND
7111
5121
2167
BC848C
3156
XTAL
25
P1
12p
75KHz
100k
1.3V
OSC.
3169
2166
version detection
150k
1n
24
stereo 0.3V
Mono/
mono 3.5V
Stereo
3167
Vcc1
23
4.8V
Vdd
Vdd
3.3V
120R
Vcc2
Vcc2
11.5V
21
2V
22
11.4V
3173
3155
3154
Vdd
T018
T045
330R
Vcc2
4.8V
22R
120R
z
7125
BC848C
z
3147
3M3
x
2137
220n
x
2135
220n
r....for RDS version only
s...for East European version (/14/34) only
t....for Japanese version (/06/26) only
6105
u...for 2-band (FM/AM) version only
Chip jumper
1
8
v...for SW-version 3.9-12.1MHz only
2
7
w...for LW only
41..
3
6
x....not for all versions
4
5
y....for USA version (/17/37) only
z....for AM-STEREO (/06/13/26/33) versions only
HN1V02H
14
15
16
17
18
19
20
21
1103 D 2
1105 B 2
1121 E20
1122 G20
1126 E20
1130 I20
6120
3156
3157
3170
remark
1131 I20
A
2101 C 6
2102 G 7
x
-
-
-
7111
2103 D 9
not mounted
2104 B 6
-
-
-
-
2106 F 5
2107 G 6
-
-
x
-
SW
2108 G 3
2109 G 3
-
x
-
x
2111 C13
2120 L11
-
x
-
-
2122 N11
B
2123 M11
-
-
-
x
2125 M11
2126 G 9
-
-
x
-
SW
2127 G10
2128 C11
2129 C 9
x
-
x
x
2130 H17
2131 I10
x
-
x
-
2132 I10
2133 H11
-
-
x
-
SW
C
2134 J17
2135 J18
x
-
-
x
2136 J17
2137 I18
-
-
x
x
2138 H12
2139 H13
-
x
x
x
2140 H14
2141 H14
x = component mounted
2142 H14
2143 I17
SW = Software initialisation
2144 I17
D
2145 G16
2146 F15
150kHz, 50mV pp
2147 F16
5V
2148 F16
2149 C15
2150 B13
r
1121
2152 F 7
1
0V
2153 E 8
GND
stereo
mono
stereo
2154 E 7
2155 D 8
2
MPX
MPX
2158 M11
E
from 3144
1126
2159 F 9
0.3V
3
1
2160 M12
enable
2161 D16
2163 E16
0.2V
4
2
2164 H14
data
2165 C 9
3
2166 G16
5
3
clock
2167 F16
2168 I 13
stereo 0.4V
6
4
3101 E 7
stereo
F
3102 E 7
mono 3.6V
3103 C 8
3104 B11
3105 D 6
3108 E 3
3109 F 2
1122
3110 F 6
T024
1
left
3113 C13
3119 B13
3123 M 7
T025
2
GND
4
3125 M 6
G
3128 M 8
T026
3132 L 9
3
right
3134 M12
3137 M13
T027
4
(5.4 - 13V)
Vcc
3140 I 13
5.4V
3141 G10
3142 G 9
11.5V
5
Vcc2
3143 I10
3144 I10
3145 H10
3146 I17
H
3147 I15
3152 H18
3153 H19
3154 H18
z
3155 H17
1130
z
3156 G17
1131
T030
1
3157 F17
V+
3158 F18
3159 F18
T031
2
3160 E18
stereo
I
3161 E18
3167 G18
3
3169 G15
STSIG
3170 F17
Low=AM mono
4
3173 H15
VCO-kill
P0
3175 B16
3176 J 9
T033
5
3177 I18
R-out
3178 I15
3179 I18
T034
6
3180 M7
L-out
J
3181 E8
T035
7
4101 G 5
L-FM
4102 F 5
4103 G 9
T036
8
4104 B13
R-FM
4105 B11
4106 K12
9
4108 L 9
P1
+FM
5102 E 4
T038
10
5103 F 4
GND
5109 B13
K
5110 B14
T039
11
5111 A13
AM-IF
AM-IF
5112 A15
5113 B12
5114 C16
5119 I 12
5120 H13
5121 F15
5122 M11
5123 L11
L
5130 E 8
5131 D 8
6103 C 2
Signal path
6104 C 3
6105 K12
6105 E 6
FM
6107 H17
6120 G16
AM
6130 E 7
6131 D 7
MPX (Audio Frequency)
7101 G11
M
7102 D 8
AF - left/right
7103 I 9
7104 E 3
7105 F 2
7109 M 7
.............
Vdc FM mode stereo
7111 F18
7119 B13
V
Vdc MW mode
7122 M 9
7124 M13
V
EVM
7125 I15
V
Vdc LW mode
9100 B 4
N
9101 D 6
9117 L10
Voltages measured while set is tuned to a strong transmitter
ECO5 PA, discr.coil, 030998
19
20
21