Adjustment - Sharp HT-DP2500W Service Manual

HT-DP2500W
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Test Stage Frequency Frequency
Display
Band — 87.50 kHz
Coverage
RF 98 MHz 98.00 MHz
(10 - 30 dB)
*1. Input: Antenna, Output: TP302
*2. Input: Anetnna, Output: Speaker Terminal
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency Frequency
Test Stage
Display
IF 450 kHz 1,602 kHz
Band — 531 kHz
Tracking 990 kHz 990 kHz
*1. Input: Antenna, Output: TP301
*2. Input: Input is not connected,
AM TRACKING
SOC201
ANTENNA
TERMINAL
T201
R216
TP302
FM RF
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ADJUSTMENT

Setting/
Instrument
Adjusting
Connection
Parts
(fL): L202 *1
3.4 ± 0.1 V
L201 *2
Setting/
Instrument
Adjusting
Connection
Parts
T204 *1
(fL): T203 *2
(AM Band
Coverage
0.8V±0.1v
T201 *1
Output: TP302
T203
AM BAND
COVERAGE
FM IF
T202
L202
L201
FM BAND
IC201
1
COVERAGE
TUNER PWB
Figure 8 ADJUSTMENT POINTS
• FM Detection
Signal generator: 10.7 MHz, FM sweep
Frequency Frequency
Test Stage
IF 10.7 MHz
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Frequency
Display
98.0 MHz 98.00 MHz
(25 dBµV)
*1. Adjust so that an output signal appears.
• Setting the Test Mode
Keeping the ENTER button and MEMORY button pressed,
turn on POWER (of Main Set). Then, the frequency is initially
set in the memory as shown in Table. Call it with the JOG to
use it for adjustment and check of tuner circuit.
Preset No. FM
1 87.50 MHz
2 108.00 MHz
3 98.00 MHz
4 90.00 MHz
5 106.00 MHz
11~40
24
IC203
1
FM MUTE
AM IF
LEVEL
VR201
T204
– 8 –
Setting/
Instrument
Display Adjusting
Connection
Parts
98.00 MHz T202 Input: Pin 1
(Turn the of IC201
core of T202 Output:
fully counter- Pin 1of
clockwise) IC203
Adjusting Instrument
Parts Connection
VR201 *1 Input: SOC201
Output: Speaker
Preset No.
6 531 kHz
7 1,602 kHz
8 990 kHz
9 603 kHz
10 1,404 kHz
TP301
R223
13
12
Terminal
AM