Sharp HT-CN300BK Service Manual - Page 8

Adjustment

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HT-CN300 ADJUSTMENT TUNER SECTION fL: Low-range frequency fH: High-range frequency • AM IF/RF Signal generator: 400 Hz, 30%, AM modulated Test Stage AM IF Frequency Frequency Display 450 kHz 1,720 kHz Setting/ Instrument Adjusting Connection Parts T351 *1 AM Band - Coverage AM Tracking 990 kHz 530 kHz 990 kHz (fL): T306 *2 1.3 ± 0.1 V (fL): T302 *1 *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. CNP301 AM/FM ANTENNA TUNER PWB T302 AM TRACKING fL FE301 8 R381 TP301 T306 R357 AM BAND COVERAGE fL TP302 AM IF VR351 T351 FM MUTE LEVEL 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). Figure 8-1 TUNER ADJUSTMENT POINTS VIDEO PWB IC401 CNP431 R522 TC432 26 Vcf (2.65 V - 2.75 V) C453 GND Figure 8-2 OSD. ADJUSTMENT POINTS - 8 -

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HT-CN300
– 8 –
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Instrument
Connection
•
AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
*1. Input: Antenna
Output: TP302
*2. Input: Antenna
Output: TP301
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
AM IF
450 kHz
1,720 kHz
T351
*1
AM Band
—
530 kHz
(fL): T306
*2
Coverage
1.3
±
0.1 V
AM Tracking
990 kHz
990 kHz
(fL): T302
*1
Figure 8-1 TUNER ADJUSTMENT POINTS
ADJUSTMENT
•
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).
TP302
TP301
T306
VR351
FM MUTE LEVEL
T302
T351
R357
FE301
R381
CNP301
AM/FM
ANTENNA
AM BAND
COVERAGE fL
AM IF
AM TRACKING
fL
TUNER PWB
8
VIDEO PWB
IC401
26
Vcf
(2.65 V - 2.75 V)
TC432
C453
GND
R522
CNP431
Figure 8-2 OSD. ADJUSTMENT POINTS