Adjustment - Sharp XL 1700 - Executive Microsystem Service Manual

XL-1700/1700C
TUNER SECTION
fL: Low-range frequency
fH: High-range frequency
• AM IF/RF
Signal generator: 400 Hz, 30%, AM modulated
Frequency Frequency Display
AM IF 450 kHz 1,620 kHz
AM Band — 522 kHz
Coverage
AM 990 kHz 990 kHz
Tracking
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected,
• Setting the Test Mode
Keeping the FF/FWD button and MEMORY/SET button
pressed, turn on POWER. Then, the frequency is initially set
in the memory as shown in Table. Call it with the VOLUME UP/
DOWN button 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
TP301

ADJUSTMENT

Setting/
Instrument
Adjusting Connection
Parts
T351 *1
(fL): T306 *2
1.1 0.1 V
(fL): T302 *1
Output: TP301
Preset No. AM
6 522 kHz
7 1,620 kHz
8 990 kHz
9 603 kHz
10 1,404 kHz
FM
TUNER PWB-B1
75
SO301
OHMS GND
ANTENNA
TERMINAL
FE301
20
IC302
VR351
FM Mute
Level
T351
AM IF
Figure 10 ADJUSTMENT POINTS
• FM Mute Level
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
98.00 MHz 98.00 MHz
(30 dB V)
*1. Adjust so that an output signal appears.
• Check FM VT
Signal generator: 1 kHz, 40 kHz dev., FM modulated
Frequency Display
87.5 MHz 87.5 MHz
108 MHz 108 MHz
AM
IC303
– 10 –
Adjusting
Instrument
Parts
Connection
VR351*1 Input: SO301
Output: Speaker
Terminal
Check Point Instrument
Connection
2.2 V 0.7 V TP301
7.3 V 1.0 V TP301
T302
AM
Tracking fL
T306
AM Band
Coverage fL