Philips AZ 2048 Service Manual page 10

TUNER ADJUSTMENT TABLE
Waverange Input frequency
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, 45mV
FM
continuous wave
FM RF
FM
87.5 - 108MHz
(65.81 - 74, 87.5 - 108MHz)
VCO
98MHz, 1mV
FM
continuous wave
AM IF
MW
connect pin 6 of
IC 7101 (AM Osc.)
with 2.2k‰ to Vcc
AM AFC
MW
3)
AM RF
LW
MW
FM/MW/LW- and FM/MW-version
( 9kHz grid)
531 - 1602kHz
MW
FM/AM-version, 10kHz grid
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)
LW has to be aligned before MW.
Repeat
( ECO6 FM/MW- and FM/MW/LW - versions with ferrite antenna)
Input
D
A
108MHz
mod=1kHz
87.5MHz
(65.81MHz)
∆f=–22.5kHz
A
C
450kHz
∆f=–10kHz
V = 0.5mV
RF
(as low as
possible)
C
continuous wave
V = 2mV
RF
198kHz
B
1494kHz
558kHz
1500kHz
∆f = –30kHz
V as low as
RF
560kHz
possible
3 - 6
Tuned to Adjust
108MHz 5130
87.5MHz
check
(65.81MHz)
1700kHz 5123
530kHz check
1602kHz 5123
531kHz check
279kHz 5122
153kHz check
1602kHz 5123
531kHz check
IC 7101
21
5119
shortcircuit
2141
to block AFC
108MHz 2155
87.5MHz
5131
(65.81MHz)
98MHz 3142
IC 7101
36
100nF
5111
IC 7101
40
100nF
5112
see
remark 2)
5114
5105
198kHz
LW ferrite coil
1494kHz 2106
5104
558kHz
MW ferrite coil
2106
1500kHz
5104
560kHz
MW ferrite coil
2)
RC network serves for damping the IF-filter while adjusting the other one.
Output Scope/Voltmeter
8V –0.2V
4.3V –0.5V
(1.2V –0.5V)
8V –0.2V
1.1V –0.4V
6.9V –0.2V
1
1.1V –0.4V
8V –0.2V
1.1V –0.4V
8V –0.2V
1.1V –0.4V
2
0 – 3 mV DC
4
MAX
3
152kHz –1kHz
5
f
o
symmetric
2
0 – 2 mV DC
5
f
o
symmetric
ECO6, general with ferrite antenna, 070799
1)