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HT-CN300
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• • • • • AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Test Stage
Frequency
AM IF
450 kHz
AM Band
—
Coverage
AM Tracking 990 kHz
*1. Input: Antenna
Output: TP302
*2. Input: Antenna
Output: TP301
• FM IF
Notes:
1: Description of the "FM IF Adjustment" is not carried on this
Manual. It is because the IF coil in the FM front end section
has been best adjusted in the factory so that its further
adjustment is not needed at the field. When replacing the
FM front end assembly, no adjustment is needed either.
2: The parts in the FM front end section are prepared in a
complete unit, so you can't obtain each part individually.
OSD SECTION
1: Connect all cables.
2: Power ON
3: Video input (DVD IN or VIDEO 1-IN or VIDEO 2-IN) :NTSC
Signal.
4: Adjust Vfc with rotated of TC432. Vfc range : 2.65 V - 2.75V
(Chick with DC voltmeter, connect (+) of DC voltmeter to pin
26 of IC401, connect (-) of DC voltmeter to pin 2 of
CNP431).
Frequency
Setting/
Instrument
Display
Adjusting
Connection
Parts
1,720 kHz
T351
*1
530 kHz
(fL): T306
*2
1.3 ± 0.1 V
990 kHz
(fL): T302
*1
ADJUSTMENT
TUNER PWB
Figure 8-1 TUNER ADJUSTMENT POINTS
VIDEO PWB
Figure 8-2 OSD. ADJUSTMENT POINTS
– 8 –
T302
T306
AM BAND
COVERAGE fL
AM TRACKING
fL
FE301
8
R381
TP301
FM MUTE LEVEL
TC432
26
Vcf
(2.65 V - 2.75 V)
R357
TP302
AM IF
VR351
T351
C453
GND
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