Sharp XL-3000 Service Manual download pdf (Page 10)

XL-3000/3000C

– 10 –

ADJUSTMENT

TUNER SECTION

GND

OHMS

ANTENNA

TERMINAL

SO301

T302

IC301

T306

T304

IC303

T351

L303

L302

VR351

TP301

FM Mute

Level

AM Band

Coverage fL

FM Band

Coverage fL

Tracking fL

AM IF

FM IF

FM OSC.

FM ANT.

FM RF

IC302

TUNER PWB-A2

Adjusting

Parts

Display

Frequency

• 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

Preset No.

1 87.5 MHz 6 530 kHz

2 108.0 MHz 7 1,720 kHz

3 98.0 MHz 8 990 kHz

4 90.0 MHz 9 600 kHz

5 106.0 MHz 10 1,400 kHz

• FM Mute Level

Signal generator: 1 kHz, 40 kHz dev., FM modulated

*1. Adjust so that an output signal appears.

• FM Detection

Signal generator: 10.7 MHz, FM sweep generator

98.00 MHz 98.00 MHz VR351*1 Input: SO301

(30 dBµV) Output: Speaker

Terminal

Instrument

Connection

*1. Input: Antenna, Output: Speaker Terminal

*2. Input: Input is not connected, Output: TP301

Frequency

Frequency Display

Setting/

Adjusting

Parts

Instrument

Connection

AM IF 450 kHz 1,620 kHz T351 *1

AM Band — 522 kHz (fL): T306 *2

Coverage 1.1 ± 0.1 V

AM 990 kHz 990 kHz (fL): T302 *1

Tracking

fL: Low-range frequency

fH: High-range frequency

Signal generator: 400 Hz, 30%, AM modulated

• AM IF/RF

Figure 10-1 ADJUSTMENT POINTS

*1. Input: Antenna, Output: TP301

*2. Input: Antenna, Output: Speaker Terminal

Test Stage

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

FM Band — 87.5 MHz (fL): L303 *1

Coverage 3.4 ± 0.1 V

FM RF 98.00 MHz 98.0 MHz L302 *2

(10~30 db)

Signal generator: 1 kHz, 75 kHz dev., FM modulated

• FM RF

Frequency

FM IF 10.7 MHz 98.0 MHz T304(Turn Input: Pin 1 of

the core of IC301

T304 fully

counter-

clockwise.)

Test

Stage

Frequency Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

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Sharp XL-3000 Service Manual Page 10

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