Philips LX600 Service Manual page 21

7A-1
TUNER BOARD (/01)
TABLE OF CONTENTS
TUNER ADJUSTMENT TABLE ...................................................... 7A-1
Circuit Diagram ............................................................................... 7A-2
PCB Layout Top View ..................................................................... 7A-3
PCB Layout Bottom View ............................................................... 7A-4
Electrical Parts List & Voltage List ................................................. 7A-5
TUNER ADJUSTMENT TABLE
Waverange Input frequency Input
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(50kHz grid)
MW
531-1602kHz
(10kHz grid)
( 21L / 21L / 37S )
FM - RF
108MHz
FM
87.5MHz mod=1kHz
∆f= ±22.5kHz
AM IF
450kHz
AM
∆f = ±15kHz
V = 3mV
Connect pin 6 of
RF
IC001 (AM Osc.)
with short wire to
AM AFC
ground (pin 4)
∆ V=mV
MW
3)
AM RF
1404kHz
612kHz
MW
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!
7A-1
Tuned to Adjust Output Scope/Voltmeter
108MHz 7.5V ± 1V
check
87.5MHz check 1.4V ± 0.2V
1602KHz check 7.2V ± 1V
1.1V ± 0.2V
531KHz T005
106MHz VC001
MAX MAX
90.1MHz L001
IC001 T001
24
100nF T002
MAX
f
o
symmetric
T003
1404kHz VC001
612kHz T006
MAX
f
o
symmetric
2)
RC network serves for damping the IF-filter while
adjusting the other one.