Philips AZ1138, Руководство по обслуживанию

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7 - 2 7 - 2
VARICAP ALIGNMENT
FM RF
FM IF
VCO
AM IF
AM RF
3)
108MHz
87.5MHz
(65.81MHz)
87.5MHz
(65.81MHz)
87.5MHz
(65.81MHz)
279kHz
153kHz
1602kHz
531kHz
5130
check
5122
check
5123
check
8V ±0.2V
4.3V ±0.5V
(1.2V ±0.5V)
8V ±0.2V
1.1V ±0.4V
8V ±0.2V
1.1V ±0.4V
1494kHz
558kHz
560kHz
1500kHz
5105
LW ferrite coil
198kHz
1494kHz
558kHz
560kHz
1500kHz
198kHz
2106
5104
MW ferrite coil
5104
MW ferrite coil
2106
3142152 kHz ±1kHz
1)
98MHz
5112
MAX
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
LW
153 - 279kHz
MW
FM/MW/LW- version, 9kHz grid
531 - 1602kHz
1700kHz
530kHz
5123
check
8V ±0.2V
1.1V ±0.4V
1602kHz
531kHz
5123
check
6.9V ±0.2V
1.1V ±0.4V
108MHz 108MHz 2155
5131
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
FM
MW
LW
98MHz, 1mV
continuous wave
450kHz
connect pin 6 of
IC 7101 (AM Osc.)
with 2.2kΩ to Vcc
Use Service Testprogram. By selecting the TUNER TEST test frequencies will be stored as preset frequencies automatically.
4
1
3
5
5
A
A
5119 FM
10.7MHz, 45mV
continuous wave
2 D
mod=1kHz
∆
f=±22.5kHz
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)
Repeat
ECO6, general with ferrite antenna, 070799
TUNER ADJUSTMENT TABLE
( ECO6 FM/MW- and FM/MW/LW - versions with ferrite antenna)
∆
f=±10kHz
V
RF
= 0.5mV
C
see
remark 2)
220R
100nF
36
IC 7101
220R
100nF
40
IC 7101
2141
shortcircuit
to block AFC
21
IC 7101
max.
symmetric
fo
AM AFC
MW
C
continuous wave
V
RF
= 2mV
5111
5114
2
0 ± 2 mV DC
0 ± 3 mV DC
MW
FM/MW/LW- and FM/MW-version
( 9kHz grid)
531 - 1602kHz
B
∆
f = ±30kHz
V
RF
as low as
possible
max.
symmetric
fo
MW
FM/AM-version, 10kHz grid
530 - 1700kHz
2) RC network serves for damping the IF-filter while adjusting the other one.
3) LW has to be aligned before MW.
Waverange Input frequency Input Tuned to Adjust Output Scope/Voltmeter
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
FM/MW-version, 9kHz grid
531 - 1602kHz
(as low as
possible)
2101 B1 2123 B1 2137 A2 2152 D2 2188 B4 3105 C2 3134 B1 3158 A2 3186 A4 4101 D1 6106 D1 7111 A3
2103 D2 2124 B1 2139 C3 2153 C3 2189 D4 3106 D1 3137 B1 3159 A2 3187 B4 4102 C1 6120 A3 7119 B3
2104 B1 2125 C1 2140 C4 2159 C2 2192 B4 3107 C1 3141 C3 3160 A2 3188 A4 4104 B1 6130 D3 7122 B1
2108 C1 2126 D3 2141 C4 2161 B4 2193 A4 3108 C1 3143 D4 3161 A3 3189 B4 4105 B2 6131 C1 7124 C1
2109 C1 2127 C3 2144 C4 2163 B4 2194 B4 3109 C1 3144 A1 3166 A4 3190 B4 4106 B2 6181 A4 7180 B4
2110 C1 2130 C3 2145 A3 2164 C4 2196 A4 3113 B3 3145 D3 3167 D4 3191 C4 4107 C2 6182 B4 7181 C4
2111 C1 2131 C3 2146 C4 2165 C2 2197 C4 3119 B2 3152 A2 3169 C4 3192 B4 4108 C2 6183 C4 7182 D4
2112 B2 2132 C3 2147 A3 2166 B4 3101 D3 3123 D3 3153 A2 3170 A3 3193 C4 4109 C1 7101 C3 7183 B4
2119 C1 2134 D4 2148 A4 2167 B4 3102 C1 3125 D4 3155 D4 3176 D3 3194 C4 4110 D1 7102 C2
2120 C1 2135 D4 2149 D4 2169 A1 3103 C2 3128 B1 3156 B3 3180 B1 3195 D4 6103 B1 7103 D4
2122 B1 2136 A2 2150 B2 2187 B4 3104 B2 3132 D3 3157 A3 3181 D2 3196 C4 6105 C1 7109 D3
J1 A4 J7 A4 1105 B5 2133 D2 2191 A1 5109 A3 5119 C2 5131 D4 9103 B1 9108 C4 9113 C5
J2 A4 J8 A4 2106 C5 2138 D2 2195 C1 5110 B2 5121 B2 7104 C5 9104 A5 9109 D2 9114 D4
J3 A4 J9 A4 2107 C4 2155 C4 3142 D1 5111 B4 5122 B5 7105 C5 9105 C1 9110 D2 9115 D5
J4 A4 J10 A4 2128 C3 2186 C1 5102 C5 5112 A3 5123 B5 9101 A2 9106 C3 9111 B2
J6 A4 0000 A5 2129 B4 2190 B1 5103 D5 5114 B2 5130 D3 9102 C1 9107 C4 9112 C5
TUNER BOARD - LAYOUT DIAGRAM