Philips FR975 Service Manual page 42

7B-2
1101 A 1 2106 C2 2137 C5 3149 C5 3173 A 5 5114 C4
1102 A 1 2107 C2 2138 A 5 3152 A 5 5102 C2 5115 A 4
1103 C1 2110 C2 2144 B 5 3154 C5 5103 C2 5116 A 4
1104 B 1 2115 C1 2148 B 4 3157 B 5 5104 C2 5119 B 5
1105 A 1 2123 A 2 2155 A 3 3158 A 5 5105 B 2 5120 B 4
1119 C5 2125 A 2 2162 A 2 3159 A 5 5106 B 2 5121 B 4
1120 A 5 2128 C3 3105 B 3 3160 A 5 5109 B 4 5122 B 3
1130 B 5 2129 C4 3110 A 2 3161 A 5 5110 B 4 5123 B 2
1131 B 5 2130 A 4 3132 B 3 3170 C5 5111 C3 5124 B 2
2104 A 2 2133 A 4 3142 A 4 3171 C5 5112 C4 5126 B 3
2105 A 1 2135 B 5 3147 B 5 3172 C5 5113 B 3 5127 B4
1 2 3
ECO 5 TUNER BOARD /
component side view
1 F C
A
3110
5130
5131
7102
A
2162 FM-OSC
9100 9121
FM-RF
2104
6101 A
9128 A
FM 75 OHM
2155 C
C
2123
FM-RF
1105
F M
E
2125
5122
9129
LW-OSC
1102
5123
FM 300 OHM
C
MW-OSC
C 9134
B
A
B
3132
5124 C
1101 6106
SW-OSC
S W 5126
5106 5105
D SW 9101
1104 9105 5104
7107
5
5111
2115 4 SW-ANT
SW-RF
B
2107
SW-RF 1 AM-IF1
2106
6109
B
MW-RF 9122
7104
B
5102
2128
2110
MW-RF
C 5103
2129
1103
LW-RF
AM FRAME AERIAL
LW-RF
7105
9133
9111
1 4 5 - - 0 9 8 2 9 6 3 3 3 3 0 0 3 3 1
This assembly drawing shows a summary
of all possible versions.
For components used in a specific version marked components to be assembled
see schematic diagram respectively partslist. as service solution for Local/DX - switching
1 2 3
PCS 102 351
5130 A 3 7104 C2 9117 B 2 9129 B 3 2101 C4 2118 B 4 2139 B 2
5131 A 3 7105 C3 9118 B 4 9130 C3 2102 C4 2119 B 4 2141 B 1
6101 A 2 7107 B 3 9119 C4 9131 A 5 2103 C3 2120 B 4 2142 B 1
6102 A 1 7119 C4 9120 B 4 9133 C3 2108 A 4 2122 B 3 2143 A 1
6103 A 1 9100 A 2 9121 A 2 9134 B 3 2109 A 4 2124 A 5 2145 C1
2111 A 2
6104 A 2 9101 B 3 9122 C3 9136 A 5 2126 C2 2146 C1
2112 B 5 2127 C2
6106 B 3 9105 B 2 9123 B 1 9137 A 5 2147 C1
2113 A 4 2131 C2 2149 B 2
6107 C5 9111 C2 9124 C4
6109 C2 9113 B 2 9125 A 3 2114 A 4 2132 C1 2150 B 2
6120 C4 9114 B 2 9126 B 5 2116 B 3 2134 C1 2151 C2
7102 A 3 9115 B 3 9128 A 2 2117 A 3 2136 B 1 2152 C3
4 5 5
ECO 5 TUNER BOARD /
4
3
A A
E 3142
VCO
2130
2133 2138
9126
5119 D
3157
DISCRIMI-
5120
NATOR
AM-IF
2144 GND
B
B
+FM
R-FM
L-FM
2135
L out
R out
5110
VCOkill
STSIG
5114
A
2137 STEREO
AM-AFC
V+
1131 1130
5112 3149
1119
AM-IF2
VCC2
SEARCH C C
GND SENS.
VCC
9124
6107
2SA... BC...
C C
B E 41..
C B
E C A B E
ECO5 3396 stage .2, 250698
4 5 5
7B-2
2153 C3 2166 B 2 3112 A 3 3123 A 3 3143 C2 3175 A 2 4105 B 3 4153 B 4 6105 A 4 7120 B 4
2154 C3 2167 B 2 3113 A 2 3125 A 3 3144 C2 3176 C2 4106 B 4 4154 C3 6110 A 4 7121 B 3
2156 C4 2168 B 1 3114 A 3 3126 B 3 3145 C2 3177 A 1 4107 C4 4155 A 4 6111 B 4 7122 B 4
2157 B 4 3101 C3 3115 A 3 3127 B 3 3146 A 1 3178 A 1 4108 B 4 4156 A 2 6130 C2 7123 B 4
2158 B 4 3102 C3 3116 A 3 3128 B 3 3148 A 1 3179 A 1 4109 A 3 4157 B 3 6131 C3 7124 C4
2159 C2 3103 C3 3117 B 4 3133 B 4 3153 C2 3180 A 4 4110 A 3 4158 C2 7101 B 2 7125 A 1
2160 C4 3104 B 3 3118 B 3 3134 B 4 3155 A 2 3181 C3 4111 C1 4159 A 2 7103 C2
2161 A 3 3106 C4 3119 A 3 3136 B 4 3156 A 1 4101 A 4 4120 C2 4160 A 1 7106 A 3
2163 A 2 3108 A 4 3120 B 4 3137 B 4 3167 C2 4102 A 4 4150 B 2 4161 A1 7108 A 3
2164 B 1 3109 A 4 3121 A 3 3140 B 2 3168 B 3 4103 C2 4151 B 3 4162 C1 7109 A 3
2165 B 3 3111 A 3 3122 B 3 3141 C2 3169 B 2 4104 A 2 4152 B 3 4163 C1 7111 A 1
4 3 2 1
copper side view
E
4156 3146
3179
2108
2163
2161
3175
4104 7125
7106 7109 3155 7111
4109 4159 3178
3111
7108 2111
2124
1
1 8
4 4 5 3121
5
3133
3120 2116
3122
SW
2157 7120
2119 3118 2142
C 3128 3169
6111
A 7122 7121
B
7101
C
C
7123 2139 3140 2168
3137 3136
4157
2136
2160
7124 2156
E 3181
FM
2127
2153
6130
3102 4111
4107 C 2126
2101
C
3106 A
4103
A 6131
2151
7103
6101 3141
4163
3143
E
2102
3167
4154
1 F C 5 4 This assembly drawing shows a summary
Chip jumper
of all possible versions.
(not all items shown
For components used in a specific version
in schematic diagram)
marked components to be assembled
see schematic diagram respectively partslist.
as service solution for Local/DX - switching
ECO5 3396 stage .2, 250698
4 3 2 1
TUNER ADJUSTMENT TABLE
( ECO5 FM/MW- and FM/MW/LW - versions with AM-frame aerial )
Waverange Input frequency Input
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
FM/MW-version, 9kHz grid
531 - 1602kHz
LW
153 - 279kHz
MW
FM/MW/LW- version, 9kHz grid
531 - 1602kHz
FM IF
10.7MHz, 50mV
FM
continuous wave
FM RF
A FM
108MHz
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz) mod=1kHz
87.5MHz
∆f=±22.5kHz
(65.81MHz)
VCO
98MHz, 1mV
FM
continuous wave
B
2
AM IF
450kHz
MW
∆f=±15kHz
C
V
connect pin 6 of
RF
3
IC 7101 (AM Osc.)
with short wire to
AM AFC
ground (pin 4)
MW
continuous wave
V
RF
3)
AM RF
4)
MW
1494kHz
FM/MW/LW- and FM/MW-version
( 9kHz grid)
558kHz
531 - 1602kHz
LW 198kHz
MW
1500kHz ∆f = ±30kHz
FM/AM-version, 10kHz grid
V as low as
RF
560kHz
530 - 1700kHz possible
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 !
Repeat
7B-2
Tuned to Adjust Output Scope/Voltmeter
8V ±0.2V
108MHz 5130
4.3V ±0.5V
87.5MHz
check
(1.2V ±0.5V)
(65.81MHz)
8V ±0.2V
1700kHz 5123
1.1V ±0.4V
530kHz check
6.9V ±0.2V
1602kHz 5123
1 1.1V ±0.4V
531kHz check
8V ±0.2V
279kHz 5122
1.1V ±0.4V
153kHz check
8V ±0.2V
1602kHz 5123
1.1V ±0.4V
531kHz check
IC 7101
21
0 ± 3 mV DC
F 5119 2
shortcircuit
2141
to block AFC
A 108MHz 2155
4
MAX
87.5MHz
5131
(65.81MHz)
152kHz ±1kHz 1)
A 3
98MHz 3142
IC 7101
36
100nF
C 5111
4
IC 7101
40
100nF 5112
= 3mV
f
see o
remark 2) symmetric
C
0 ± 2 mV DC
5114 2
= 10mV
1494kHz 2106
B
558kHz 5102
4
198kHz 5103
1500kHz 2106
f
o
symmetric
560kHz 5102
ECO5, discr. coil, 090797
2)
RC network serves for damping the IF-filter while adjusting the other one.
4)
MW has to be aligned before LW.