Service manual

HT-DP2500W
– 8 –
Figure 8 ADJUSTMENT POINTS
TUNER SECTION
fL: Low-range frequency
fH: High-renge frequency
Instrument
Connection
• FM RF
Signal generator: 1 kHz, 75 kHz dev., FM modulated
Test Stage
Frequency
Frequency
Display
Setting/
Adjusting
Parts
Band — 87.50 kHz (fL): L202 *1
Coverage 3.4 ± 0.1 V
RF 98 MHz 98.00 MHz L201 *2
(10 - 30 dB)
*1. Input: Antenna, Output: TP302
*2. Input: Anetnna, Output: Speaker Terminal
• FM Detection
Signal generator: 10.7 MHz, FM sweep
Test Stage
Instrument
Connection
Frequency
Frequency
Display
Setting/
Adjusting
Parts
IF 10.7 MHz 98.00 MHz T202 Input: Pin 1
(Turn the of IC201
core of T202 Output:
fully counter- Pin 1of
clockwise) IC203
ADJUSTMENT
IF 450 kHz 1,602 kHz T204 *1
Band — 531 kHz (fL): T203 *2
(AM Band
Coverage
0.8V±0.1v
Tracking 990 kHz 990 kHz T201 *1
Test Stage
Instrument
Connection
Frequency
Frequency
Display
Setting/
Adjusting
Parts
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
• 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 87.50 MHz 6 531 kHz
2 108.00 MHz 7 1,602 kHz
3 98.00 MHz 8 990 kHz
4 90.00 MHz 9 603 kHz
5 106.00 MHz 10 1,404 kHz
11~40
FM Preset No.
AM
*1. Input: Antenna, Output: TP301
*2. Input: Input is not connected, Output: TP302
*1. Adjust so that an output signal appears.
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Adjusting
Parts
Instrument
Connection
Frequency
Display
98.0 MHz 98.00 MHz VR201 *1 Input: SOC201
(25 dBµV) Output: Speaker
Terminal
T201
AM TRACKING
AM BAND
COVERAGE
T203
R216
TP302
L201
FM RF
IC201
T202
L202
FM IF
VR201
FM MUTE
LEVEL
T204
IC203
TP301
R223
TUNER PWB
FM BAND
COVERAGE
SOC201
ANTENNA
TERMINAL
1
AM IF
1
12
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