Philips MCW770 Service Manual page 38

1101 A6 1120 A4 1132 A5 2128 C4 2138 C2 3142 D2 5110 B3 5114 A2
1102 B6 1130 B5 2106 C5 2129 B4 2144 B2 5102 D6 5111 B4 5119 C2
1103 D6 1131 D5 2107 B5 2133 D2 2155 C4 5109 A3 5112 A3 5121 B2
TUNER BOARD ECO6 Systems non Cenelec /
2101 B4 2119 D3 2130 D5 2137 A4 2146 B7 2153 C5 2165 C4
2102 B1 2120 D3 2131 C5 2139 C6 2147 A5 2154 C4 2166 B6
2103 D4 2124 D3 2132 D6 2140 C6 2148 B6 2159 C5 2167 B6
2104 B4 2125 D3 2134 D7 2141 C6 2149 D6 2161 A6 2169 A4
2105 C1 2126 D6 2135 D7 2143 C7 2150 B5 2163 B6 3101 D5
2112 B5 2127 C5 2136 A4 2145 A5 2152 C5 2164 C6 3102 C3
TUNER BOARD ECO6 Systems - non Cenelec /
4 3
1 7
2 8
A
C
1
D
These assembly drawings show a summary of all possible versions.
For components used in a specific version see schematic diagram respectively partslist.
9-4
5123 D5 7112 C1 9104 B5 9107 D4
5130 D3 9101 A2 9105 B1 9108 C4
5131 D4 9103 B2 9106 B3 9109 D2
componentside view
FM 75Ω
AM FRAME AERIAL
ECO6 System non Cenelec stage .3, 120900
3103 C4 3134 D3 3152 A4 3158 A4 3169 B6 4106 C4 6107 C7
3104 B4 3141 C5 3153 A4 3159 A5 3170 A6 4107 C5 6120 A6
3105 C4 3143 D6 3154 C7 3160 A5 3172 C7 4108 C5 6130 D4
3113 B5 3144 B7 3155 C7 3161 A5 3176 D6 6103 B3 6131 C4
3119 B5 3145 C5 3156 A6 3167 B7 3181 D4 6105 C3 7101 C5
3132 D5 3146 C7 3157 A6 3168 C7 4103 B5 6106 C3 7102 D4
copperside view
K
A
C
V dd
B E
SMD jumper
41..
(not all items shown
in schematic diagram)
2
Vcc2
Vcc1
5
ECO6 Systems non CENELEC stage .3, 120900
TUNER ADJUSTMENT TABLE
Waverange Input frequency
VARICAP ALIGNMENT
FM
87.5 - 108MHz
A
(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, 45mV
B
FM
continuous wave
FM RF
FM
108MHz
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
87.5MHz
7103 D7
(65.81MHz)
7111 A5
7119 B5
VCO
98MHz, 1mV
FM
continuous wave
AM IF
450kHz
MW
connect pin 6 of
IC 7101 (AM Osc.)
with 3.3kΩ to Vcc
AM AFC
MW
3)
AM RF
4)
MW
1494kHz
FM/MW/LW- and FM/MW-version
( 9kHz grid)
558kHz
531 - 1602kHz
LW 198kHz
MW
1500kHz
FM/AM-version, 10kHz grid
560kHz
530 - 1700kHz
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)
3)
For AM RF adjustments the original frame antenna has to be used !
Repeat
9-4
( ECO6 FM/MW- and FM/MW/LW - versions with AM-frame aerial )
Input Tuned to Adjust Output
108MHz 5130
87.5MHz
check
(65.81MHz)
1700kHz 5123
530kHz check
1602kHz 5123
1
531kHz check
279kHz 5122
153kHz check
1602kHz 5123
531kHz check
IC 7101
21
D 2
5119
shortcircuit
2141
to block AFC
A
108MHz 2155
4
mod=1kHz
87.5MHz
5131
∆f=±22.5kHz
(65.81MHz)
A 3
98MHz 3142
IC 7101
36
100nF
C
5111
5
∆f=±10kHz
IC 7101
40
V = 0.5mV
RF 100nF 5112
(as low as
see
remark 2)
possible)
C
5114
2
continuous wave
V = 2mV
RF
1494kHz 2106
B
558kHz 5102
5
198kHz 5103
2106
∆f = ±30kHz 1500kHz
V as low as
RF
560kHz 5102
possible
2)
RC network serves for damping the IF-filter while adjusting the other one.
4)
MW has to be aligned before LW.
5) 1.7V ±0.5V when alternative varicap. BB804 is used
on pos 6130 6131
Scope/Voltmeter
8V ±0.2V
4.3V ±0.5V
5)
(1.2V ±0.5V)
8V ±0.2V
1.1V ±0.4V
6.9V ±0.2V
1.1V ±0.4V
8V ±0.2V
1.1V ±0.4V
8V ±0.2V
1.1V ±0.4V
0 ± 3 mV DC
MAX
152kHz ±1kHz 1)
f
o
symmetric
0 ± 2 mV DC
f
o
symmetric
ECO6, Sys + PA with frame aerial, 170501