Tuner Board - Philips HTS3400 Service Manual

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TUNER BOARD

TABLE OF CONTENTS
Tuner adjustment table ................................................................... 6-1
Circuit Diagram ............................................................................... 6-2
PCB Layout View (Top) .................................................................. 6-3
PCB Layout View (Bottom) ............................................................ 6-4
6-1
3/2/2013
TUNER ADJUSTMENT TABLE
Waverange Input frequency
VARICAP ALIGNMENT
FM
87.5 - 108MHz
(50kHz grid)
AM
530-1710kHz
(10kHz grid)
( 21L / 21L / 37S )
FM - IF
10.7MHz, 50mV
FM
continuous wave
FM - RF
108MHz
FM
87.5MHz
AM IF
450kHz
AM
Connect pin 29 of
IC001 (AM Osc.)
with short wire to
AM AFC
ground (pin 6)
MW
3)
AM RF
1404kHz
576kHz
MW
1400kHz
610kHz
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!
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6-1
Input Tuned to Adjust Output
108MHz
check
87.5MHz check
1602KHz check
T005
531KHz
check
1700KHz
T005
530KHz
IC001
23
No need
short circuit
200P
to adjust
to block AFC
106MHz VC001
MAX
90.1MHz L001
mod=1kHz
∆f= ±22.5kHz
IC001 T001
24
100nF T002
MAX
∆f = ±15kHz
V = 3mV
RF
T003
V=mV
∆
1404kHz VC001
612kHz T006
MAX
∆f = ±30kHz
1400kHz VC002
V as low as
RF
possible
610kHz
T006
2)
RC network serves for damping the IF-filter while
adjusting the other one.
www.nostatatech.nl
Scope/Voltmeter
6.5V ±1.2V
1.0V ±0.5V
7.8V ± 0.2V
1.1V ± 0.5V
8.0V 1HV
±
1.1V ± 0.2V
fo
Symmetric
MAX
f
o
symmetric
f
o
symmetric