Cenelec Tuner Portion - Component & Chip Layouts - Philips FW-M355 Service Manual

CENELEC TUNER PORTION - COMPONENT & CHIP LAYOUTS
This assembly drawing shows a summary of all possible versions. For components
used in a specific version see schematic and respective parts list.
Combi pt 1, pt 2 & pt 3 board are same
5
2
This assembly drawing shows a summary of all possible versions.
For components used in a specific version see schematic and
respective parts list.
11-12
A
AM FRAME
AERIAL
B
3139 118 3462pt1 / 3463pt1 ...90280 dd wk149
Combi pt 1, pt 2 & pt 3 board are same
1
D
A
3
C
4
3139 118 3462pt1 / 3463pt1 ...90280 dd wk149
TUNER ADJUSTMENT TABLE
( ECO6 Cenelec FM/MW - and FM/MW/LW - versions with AM-frame aerial )
Waverange Input frequency Input
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(50kHz grid)
MW
531 - 1602kHz
(9kHz grid)
LW
153 - 279kHz
(3kHz grid)
FM - IF
10.7MHz, 45mV
D
FM
continuous wave
FM - VCO
98MHz, 1mV
A
FM
continuous wave
Note: The FM-frontend unit has already been adjusted by the factory
FM RF (channel separation)
and needs therefore no further adjustments for service purposes.
98MHz, 1mV
FM 90% Left + 9% pilot A
mod=1kHz
AM IF
C
∆f = ±10kHz
MW 450kHz
V = 0.5mV
RF
(as low as
connect pin 6 of
possible)
IC 7101 (AM Osc.)
with 3.3kΩ to Vcc
AM AFC C
MW
continuous wave
V = 2mV
RF
3)
AM RF
1494kHz
B
MW
558kHz
∆f = ±30kHz
V as low as
LW 198kHz
RF
possible
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
11-12
Tuned to Adjust Output Scope/Voltmeter
8V ±1.2V
108MHz check
1.6V ±0.5V
87.5MHz check
8V ±0.2V
1602kHz 5123
6.9V ±0.2V
1
1.1V ±0.4V
531kHz check
8V ±0.2V
279kHz 5122
1.1V ±0.4V
153kHz check
IC 7101
21
0mV ±3mV
2
5119
shortcircuit
2141
to block AFC
152kHz ±1kHz
3
98MHz 3142
IF coil
inside
98MHz 4 right channel min.
FM frontend
1110
IC 7101
36
100nF
5111
5
IC 7101
40
100nF
5112
f
o
see symmetric
remark 2)
0mV ±2mV
5114 2
1494kHz 2106
558kHz 5102
5
f
o
198kHz 5103
symmetric
ECO6 Sys Cenelec, 190599
3-band
2-band
1)