Philips AZ 2785 Instrukcja serwisowa - Strona 19

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Philips AZ 2785 Instrukcja serwisowa
TUNER BOARD ECO5 - LAYOUT DIAGRAM
1
2
ECO 5 TUNER BOARD /
component side view
A
3110
A
2162
9100
9121
2104
6101
9128
FM 75 OHM
2123
1105
F M
E
2125
5122
LW-OSC
1102
5123
FM 300 OHM
C
MW-OSC
C
B
B
A
5124
C
1101
SW-OSC
S W
5106
5105
D
SW
1104
9105
5104
5
2115
4
SW-ANT
SW-RF
B
2107
SW-RF
1
2106
6109
MW-RF
7104
5102
2110
MW-RF
C
5103
1103
LW-RF
AM FRAME AERIAL
LW-RF
9111
1 4
5 -
- 0
9 8
2
9 6
3 3
This assembly drawing shows a summary
of all possible versions.
For components used in a specific version
see schematic diagram respectively partslist.
1
2
5
4
ECO 5 TUNER BOARD /
copper side view
2108
A
7106 7109
2124
1
1
8
4
5
4
5
D
3133
3120
SW
2157
7120
2119
C
B
6111
A
7122
B
C
C
3137
7123
3136
2160
2156
7124
E
FM
A
4107
2101
3106
6101
C
2102
C
C
1
41..
Chip jumper
(not all items shown
in schematic diagram)
marked components to be assembled
A
B
E
as service solution for Local/DX - switching
5
4
8-2
3
4
5
1
F
C
4
5130
5131
7102
FM-OSC
E
3142
FM-RF
VCO
A
A
2155
C
C
2130
2133
2138
FM-RF
9126
9129
5119
3157
DISCRIMI-
5120
NATOR
AM-IF
9134
2144
GND
3132
+FM
R-FM
6106
L-FM
5126
2135
L out
9101
R out
7107
5110
VCOkill
5111
STSIG
5114
AM-IF1
STEREO
2137
AM-AFC
V+
B
9122
1131
1130
5112
B
3149
2128
1119
AM-IF2
VCC2
SEARCH
2129
GND
SENS.
7105
VCC
9133
9124
6107
3
3 0
0 3
3 1
2SA...
BC...
B
marked components to be assembled
C
as service solution for Local/DX - switching
E
ECO5 3396 stage .2, 250698
3
4
5
3
2
1
E
3146
4156
3179
2163
2161
3175
4104
7125
3155
7111
4109
3178
4159
3111
7108
2111
3121
2116
3122
2142
3118
3128
3169
7121
7101
3140
2139
2168
4157
2136
3181
2127
2153
6130
3102
4111
C
2126
C
A
4103
A
6131
2151
7103
3141
4163
3143
E
3167
4154
F
C
5
4
This assembly drawing shows a summary
of all possible versions.
For components used in a specific version
see schematic diagram respectively partslist.
ECO5 3396 stage .2, 250698
3
2
1

TUNER ADJUSTMENT TABLE

Waverange
Input frequency
VARICAP ALIGNMENT
FM
87.5 - 108MHz
3
A
FM Japan
76 - 90MHz plus
Ch1 95.75MHz, Ch2 101,75MHz,
Ch3 107.75MHz
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
MW
B
FM/MW-version, 9kHz grid
531 - 1602kHz
FM IF
10.7MHz, 50mV
FM
continuous wave
C
FM RF
FM
87.5 - 108MHz
E
B
FM Japan
C
76 - 90MHz plus
Ch1 95.75MHz, Ch2 101,75MHz,
Ch3 107.75MHz
VCO
98MHz, 1mV
FM
(83MHz for Japan)
continuous wave
AM IF
MW
A
connect pin 6 of
AM AFC
IC 7101 (AM Osc.)
with short wire to
MW
ground (pin 4)
B
2
IF stereo module
MW
3)
AM RF
MW
C
FM/MW-version, 9kHz grid
3
531 - 1602kHz
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
Use service test program. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
1)
If sensitivity of frequency counter is too low adjust to max. channel separation
(input signal: stereo left 90% + 9%, adjust output on right channel to minimum)
3)
For AM RF adjustments the original frame antenna has to be used !
8-2
( ECO5 FM/MW- stereo versions with AM-frame aerial )
Input
Tuned to
Adjust
108MHz
5130
87.5MHz
check
107,75MHz
5130
76MHz
check
1700kHz
5123
530kHz
check
1602kHz
5123
531kHz
check
IC 7101
21
F
5119
shortcircuit
2141
to block AFC
108MHz
108MHz
2155
A
87.5MHz
87.5MHz
5131
107.75MHz
mod=1kHz
107.75MHz
2155
D f=±22.5kHz
76MHz
76MHz
5131
A
98MHz
3142
(83MHz for Japan)
IC 7101
36
100nF
C
5111
D f=±15kHz
IC 7101
40
100nF
5112
V
= 3mV
450kHz
RF
see
remark 2)
C
5114
continuous wave
V
= 10mV
RF
100nF
E
50R
5240
D f=±15kHz
V
= 1mV
RF
1494kHz
1494kHz
2106
B
558kHz
558kHz
5102
1500kHz
2106
D f = ±30kHz
1500kHz
V
as low as
RF
560kHz
5102
560kHz
possible
2)
RC network serves for damping the IF-filter while adjusting the other one.
Repeat
Output
Scope/Voltmeter
8V ±0.2V
4.3V ±0.5V
8V ±0.2V
2.4V ±0.5V
1
8V ±0.2V
1.1V ±0.4V
6.9V ±0.2V
1.1V ±0.4V
2
0 ± 3 mV DC
5
MAX
1)
3
152kHz ±1kHz
5
f
o
symmetric
2
0 ± 2 mV DC
4
4
f
o
symmetric
ECO5 AM stereo, discr.coil 090797
PCS 104 457