Tuner Board - Philips HTS3400 Service Manual

6-1

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
TUNER ADJUSTMENT TABLE
Waverange Input frequency Input
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 mod=1kHz
∆f= ±22.5kHz
AM IF
450kHz
AM
∆f = ±15kHz
V = 3mV
Connect pin 29 of
RF
IC001 (AM Osc.)
with short wire to
AM AFC
ground (pin 6)
∆ V=mV
MW
3)
AM RF
1404kHz
576kHz
MW
∆f = ±30kHz
1400kHz
V as low as
RF
possible
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!
6-1
Tuned to Adjust Output Scope/Voltmeter
108MHz 6.5V ±1.2V
check
87.5MHz check 1.0V ±0.5V
1602KHz check 7.8V ± 0.2V
1.1V ± 0.5V
531KHz T005
check
1700KHz
8.0V ±
T005
1.1V ± 0.2V
530KHz
IC001
23
No need
fo
short circuit
200P
to adjust
to block AFC
Symmetric
106MHz VC001
MAX MAX
90.1MHz L001
IC001 T001
24
100nF
T002
MAX
f
o
symmetric
T003
1404kHz VC001
612kHz T006
MAX
1400kHz VC002
f
o
symmetric
610kHz
T006
2) RC network serves for damping the IF-filter while
adjusting the other one.
1HV