Sharp XL-3000V Adjustment, FM Detection, FM Mute Level, Check FM VT, Setting the Test Mode

XL-3000V

ADJUSTMENT

TUNER SECTION

fL: Low-range frequency

fH: High-range frequency

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Frequency	Frequency	Display		Setting/	Instrument
				Adjusting	Connection
				Parts
AM IF	450 kHz	1,602 kHz		T351	*1
AM Band	—	531 kHz		(fL): T306	*2
Coverage				1.1 ± 0.1 V
AM	990 kHz	990 kHz		(fL): T302	*1
Tracking
*1. Input: Antenna, Output: Speaker Terminal
*2. Input: Input is not connected,			Output: TP301

• FM Detection

Signal generator: 10.7 MHz, FM sweep generator

Test	Frequency	Frequency	Setting/	Instrument
Stage		Display	Adjusting	Connection
			Parts
FM IF	10.7 MHz	98.0 MHz	T304(Turn	Input: Pin 1 of
			the core of	IC301
			T304 fully
			counter-
			clockwise.)

• FM RF

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

	Frequency	Frequency	Setting/	Instrument
		Display	Adjusting	Connection
			Parts
FM Band	—	87.50 MHz	(fL): L303	*1
Coverage			3.4 ± 0.1 V
FM RF	98.00 MHz	98.00 MHz	L302	*2
	(10~30 db)

• FM Mute Level

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

Frequency	Display	Adjusting	Instrument
		Parts	Connection
98.00 MHz	98.00 MHz	VR351*1	Input: SO301
(25±1 dBμV)			Output: Speaker
			Terminal

*1. Adjust so that an output signal appears.

• Check FM VT

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

Frequency	Display	Check Point	Instrument
			Connection
87.5 MHz	87.5 MHz	3.4 V ± 0.1 V	TP301
108 MHz	108 MHz	7.8 V ± 1.0 V	TP301

• Setting the Test Mode

Keeping the FF/PRESET UP button and MEMORY/SET button pressed, turn on ON/STAND-BY. 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.	AM
1	87.50	MHz	6	531 kHz
2	108.00	MHz	7	1,602 kHz
3	98.00	MHz	8	990 kHz
4	90.20	MHz	9	612 kHz
5	106.00	MHz	10	1,404 kHz

FM TUNER PWB-A2 75

ANTENNASO301 OHMS GND AM

TERMINAL

*1. Input: Antenna, Output: TP301

*2. Input: Antenna, Output: Speaker Terminal

TP301	IC301	FM ANT.
		FM RF
20	1
IC302	L302
FM OSC. L303		T302
		AM
FM Band	T304
		Tracking fL
Coverage fL
	FM IF
VR351
FM Mute
Level
T351		T306
		AM Band
AM IF	IC303
		Coverage fL

Figure 13-1 ADJUSTMENT POINTS

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