Sharp CD-XP300H Servicehandleiding - Pagina 7

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TUNER SECTION

fL: Low-range frequency

fH: High-range frequency

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

Frequency Frequency

Test Stage

Display

AM IF

450 kHz

1,620 kHz

AM Band

—

522 kHz

Coverage

AM Tracking 990 kHz

990 kHz

*1. Input: Antenna

Output: TP302

*2. Input: Antenna

Output: TP301

T351

AM IF

TP302

L354

R357

AM BAND

COVERAGE fL

Figure 15-1 ADJUSTMENT POINTS

• FM IF

Notes:

1: Description of the "FM IF Adjustment" is not carried on this

Manual. It is because the IF coil in the FM front end section

has been best adjusted in the factory so that its further

adjustment is not needed at the field. When replacing the

FM front end assembly, no adjustment is needed either.

2: The parts in the FM front end section are prepared in a

complete unit, so you can't obtain each part individually.

All manuals and user guides at all-guides.com

Setting/

Instrument

Adjusting

Connection

Parts

T351

(fL): T306

1.1 ± 0.1 V

(fL): T303

MAIN PWB

R381

FE301

TP301

SO301

FM ANTENNA

TERMINAL

CNP301

AM LOOP

ANTENNA

T303

T306

AM TRACKING

CD SECTION

• Adjustment

Since this CD system incorporates the following automatic

adjustment functions, readjustment is not needed when

replacing the pickup. Therefore, different PWBs and pickups

can be combined freely.

Each time a disc is changed, these adjustments are

performed automatically. Therefore, playback of each disc

can be performed under optimum conditions.

Items adjusted automatically

(1) Offset adjustment (The offset voltage between the head

amplifier output and the VREF reference voltage is

compensated inside the IC.)

* Focus offset adjustment

* Tracking offset adjustment

(2) Tracking balance adjustment (waveform drawing

Fig.15-2 EFBL)

(3) Gain adjustment (The gain is compensated inside the IC

so that the loop gain at the gain crossover frequency will

be 0 dB.)

* Focus gain adjustment

* Tracking gain adjustment

CD ERROR CODE DESCRIPTION

Error

When Pickup set inner position, inner switch

cannot detect 'ON' level for 10 secs.

When tray moves to Open/Close, Open/Close switch

cannot detect 'ON' level for 7 secs.

10*

When disc table rotate to target position.

Clamp switch cannot detect 'ON' level for 7 secs.

When disc table set to Disc1 position for 1 st time,

11*

"CLAMP SW", "DISC NO SW" and "OPEN/CLOSE"

cannot detect 'ON' level for 14 secs.

When it changes to CD function, DSP cannot read

initial data.

* 'CHECKING'

If Error is detected, 'CHECKING' will be display instead of 'ER-

CD**' display. 'ER-CD**' display will only be display when

error had been detected for the 5 th times.

Stopped

CH1=500 mV

CH2=200 mV

DC 10:1

FDO

EFBL

=Filter=

=Offset=

Smoothing : ON

CH1 :

0.000 V

BW : FULL

CH2 :

0.000 V

CH3 :

0.00 V

CH4 :

0.00 V

– 15 –

CD-XP300H

Explanation

1999/04/05 20:26:47

CH3=1 V

500 ms/div

DC 10:1

(500 ms/div)

NORM:20 kS/s

=Record Length=

=Trigger=

Main :

100 K

Mode : SINGLE

Zoom :

2 k

Type : EDGE CH1

Delay :

Hold off :

Figure 15-2

CH2

v/DIV

200 mV

0.0 ns

0.2 µs