Philips MC-500 Service Manual page 28

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 3123 A5
2105 B1 2122 C3 2131 C4 2139 B4 2147 A5 2163 A4 2180 B2 3125 A5
2108 C1 2123 C3 2132 C4 2140 B4 2148 B4 2164 B4 2190 B2 3128 C2
2109 C1 2124 C3 2134 C5 2141 B5 2149 C4 2165 B3 3105 B3 3130 C4
2118 C3 2125 C3 2135 C5 2143 B5 2150 B3 2166 B5 3108 C2 3131 C4
2119 C3 2127 C4 2136 A3 2145 B5 2159 B3 2167 B4 3109 C1 3132 B3
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.
7B-3
5110 A2 5114 A2 5121 B2 7104 C4 9101 A2 9104 B1 9107 B4
5111 A3 5115 C2 5122 C3 7105 C5 9102 B2 9105 B1 9108 B3
5112 A2 5119 B2 5123 C3 7112 B1 9103 A1 9106 B1 9109 C2
componentside view
FM 75
AM FRAME AERIAL
ECO6 Sys-Cenelec, layout stage .6, 160501
3134 C3 3145 C4 3154 B5 3160 A3 3171 B5 3192 A2 4104 C3
3135 C4 3146 B5 3155 B5 3161 A4 3172 B5 3193 B2 4105 B2
3137 C4 3150 B3 3156 A4 3167 A5 3176 C4 3194 B2 4106 B3
3141 B3 3151 A2 3157 A4 3168 C5 3180 A5 3195 B2 4107 C4
3143 C5 3152 A3 3158 A3 3169 B4 3190 B2 4101 C2 5118 C4
3144 A5 3153 A3 3159 A3 3170 A4 3191 A3 4102 C2 6105 B2
copperside view
V dd
(not all items shown
in schematic diagram)
Vcc2
Vcc1
ECO6 Sys-Cenelec, layout stage .6, 160501
5 2
9110 A4
TUNER ADJUSTMENT TABLE
9111 A3
Waverange Input frequency
VARICAP ALIGNMENT
FM
87.5 - 108MHz
A
(50kHz grid)
MW
531 - 1602kHz
(9kHz grid)
LW
153 - 279kHz
(3kHz grid)
FM - IF
10.7MHz, 45mV
FM
continuous wave
FM - VCO
B
FM
continuous wave
FM RF (channel separation)
6106 B2 7110 B2
6107 B5 7111 A4
6120 A4 7122 C3
7101 B4 7124 C3
FM 90% Left + 9% pilot
7103 C5
7109 A5
AM IF
MW
connect pin 6 of
K
IC 7101 (AM Osc.)
with 3.3k to Vcc
AM AFC
A
MW
C
3)
AM RF
B E
SMD jumper
MW
41..
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
7B-3
( ECO6 Cenelec FM/MW - and FM/MW/LW - versions with AM-frame aerial )
Input Tuned to Adjust
108MHz check
87.5MHz check
1602kHz 5123
531kHz check
279kHz 5122
153kHz check
IC 7101
21
D
5119
shortcircuit
2141
to block AFC
98MHz, 1mV
A 98MHz 3142
Note: The FM-frontend unit has already been adjusted by the factory
and needs therefore no further adjustments for service purposes.
IF coil
98MHz, 1mV
inside
A
98MHz
FM frontend
mod=1kHz
1110
IC 7101
36
C
100nF
5111
f = 10kHz
450kHz
V = 0.5mV
IC 7101
RF 40
(as low as
100nF
5112
possible)
see
remark 2)
C
5114
continuous wave
V = 2mV
RF
1494kHz 1494kHz 2106
B
558kHz 558kHz 5102
f = 30kHz
V as low as
198kHz 198kHz 5103
RF
possible
Output Scope/Voltmeter
8V 1.2V
1.6V 0.5V
8V 0.2V
3-band
6.9V 0.2V
2-band
1
1.1V 0.4V
8V 0.2V
1.1V 0.4V
2
0mV 3mV
1)
3 152kHz 1kHz
4
right channel min.
5
f
o
symmetric
2 0mV 2mV
5
f
o
symmetric
ECO6 Sys Cenelec, 190599