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
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
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
TP302
FM RF

ADJUSTMENT

Setting/
Instrument
Display
Adjusting
Connection
Parts
(fL): L202 *1
3.4 0.1 V
L201 *2
Setting/
Instrument
Adjusting
Display
Connection
Parts
T204 *1
(fL): T203 *2
(AM Band
Coverage
0.8V 0.1v
T201 *1
Output: TP302
AM BAND
COVERAGE
R216
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
Test Stage
IF
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency
98.0 MHz
(25 dB V)
*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.
1
2
3
4
5
11~40
T203
24
1
FM MUTE
AM IF
LEVEL
VR201
T204
– 8 –
Frequency Frequency
Display Adjusting
10.7 MHz 98.00 MHz T202
(Turn the
core of T202 Output:
fully counter- Pin 1of
clockwise)
Adjusting
Frequency
Display Parts
98.00 MHz VR201 *1
FM Preset No.
87.50 MHz 6
108.00 MHz 7
98.00 MHz 8
90.00 MHz 9
106.00 MHz 10
TP301
R223
13
IC203
12
Setting/
Instrument
Connection
Parts
Input: Pin 1
of IC201
IC203
Instrument
Connection
Input: SOC201
Output: Speaker
Terminal
AM
531 kHz
1,602 kHz
990 kHz
603 kHz
1,404 kHz