Layout Diagram; Tuner Adjustment Table - Philips MC-120 Service Manual

LAYOUT DIAGRAM - ECO6 SYSTEM CENELEC BOARD
1101 B5 1110 B4 1131 C5 2107 B3 2133 C1 2162 A4 5102 C4
1102 B5 1120 A4 1132 A4 2128 A3 2138 B1 2191 B4 5103 C4
1103 C5 1130 A5 2106 B4 2129 B3 2144 B1 3142 C2 5109 B3
TUNER BOARD ECO6 Systems - Cenelec /
Birdy Filter
2102 B1 2120 C3 2130 B3 2137 A3 2146 B5 2161 A4 2169 A3
2105 B1 2122 C3 2131 C4 2139 B4 2147 A5 2163 A4 2190 B2
2108 C1 2123 C3 2132 C4 2140 B4 2148 B4 2164 B4 3105 B3
2109 C1 2124 C3 2134 C4 2141 B5 2149 C4 2165 B3 3108 C2
2118 C3 2125 C3 2135 C5 2143 B5 2150 B3 2166 B5 3109 C1
2119 C3 2127 C4 2136 A3 2145 B5 2159 B3 2167 B4 3123 A5
TUNER BOARD ECO6 Systems - Cenelec /
4 3
1 7
2 8
A
1
+FM
D
C
8
1
These assembly drawings show a summary of all possible versions.
For components used in a specific version see schematic diagram respectively partslist.
7 - 2
5110 A2 5114 A2 5121 B2 7104 C4 9101 A2 9104 B1 9107 B4 9110 A4
5111 A3 5115 C2 5122 C3 7105 C5 9102 B2 9105 B1 9108 B3 9111 A3
5112 A2 5119 B2 5123 C3 7112 B1 9103 A1 9106 B1 9109 C2
componentside view
FM 75Ω
AM FRAME AERIAL
ECO6 Sys-Cenelec, layout stage .5, 080900
3125 A5 3143 C5 3152 A3 3158 A3 3169 B4 3190 B2 4101 C2 6105 B2
3128 C2 3144 A5 3153 A3 3159 A3 3170 A4 3191 A3 4102 C2 6106 B2
3132 B3 3145 C4 3154 B5 3160 A3 3171 B5 3192 A2 4104 C3 6107 B5
3134 C3 3146 B5 3155 B5 3161 A4 3172 B5 3193 B2 4105 B2 6120 A4
3137 C4 3150 B3 3156 A4 3167 A5 3176 C4 3194 B2 4106 B3 7101 B4
3141 B3 3151 A2 3157 A4 3168 C5 3180 A5 3195 B2 4107 C4 7103 C5
copperside view
A
V dd
B
SMD jumper
41..
(not all items shown
in schematic diagram)
Vcc2
Vcc1
ECO6 Sys-Cenelec, layout stage .5, 080900
5 2

TUNER ADJUSTMENT TABLE

Waverange Input frequency
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(50kHz grid)
MW
A
531 - 1602kHz
(9kHz grid)
LW
153 - 279kHz
(3kHz grid)
FM - IF
FM
FM - VCO
B
FM
FM RF (channel separation)
90% Left + 9% pilot
FM
7109 A5
7110 B2
7111 A4
7122 C3
7124 C3
AM IF
MW
IC 7101 (AM Osc.)
K AM AFC
MW
C 3)
AM RF
E
MW
LW
Use Service Testprogram. 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)
2)
RC network serves for damping the IF-filter while adjusting the other one.
3)
For AM RF adjustments the original frame antenna has to be used!
MW has to be aligned before LW.
Repeat
7 - 2
( ECO6 Cenelec FM/MW - and FM/MW/LW - versions with AM-frame aerial )
Input Tuned to
108MHz
87.5MHz
1602kHz
531kHz
279kHz
153kHz
IC 7101
21
10.7MHz, 45mV
D
continuous wave
shortcircuit
2141
to block AFC
98MHz, 1mV
A 98MHz
continuous wave
Note: The FM-frontend unit has already been adjusted by the factory
and needs therefore no further adjustments for service purposes.
98MHz, 1mV
A 98MHz
FM frontend
mod=1kHz
IC 7101
36
C
100nF
∆f = ±10kHz
450kHz
V = 0.5mV
IC 7101
RF
40
(as low as
100nF
connect pin 6 of
possible)
see
remark 2)
with 3.3kΩ to Vcc
C
continuous wave
V = 2mV
RF
1494kHz 1494kHz
B
558kHz 558kHz
∆f = ±30kHz
V as low as
198kHz 198kHz
RF
possible
Adjust Output Scope/Voltmeter
check 8V ±1.2V
check 1.6V ±0.5V
8V ±0.2V
3-band
5123
6.9V ±0.2V
2-band
1
check 1.1V ±0.4V
5122 8V ±0.2V
check 1.1V ±0.4V
5119 2 0mV ±3mV
1)
3142 3 152kHz ±1kHz
IF coil
inside
4 right channel min.
1110
5111
5
5112
f
o
symmetric
5114 0mV ±2mV
2
2106
5102
5
f
o
5103
symmetric
ECO6 Sys Cenelec, 190599