Sharp CD-PC3500 Service Manual download pdf (Page 14)

CD-PC3500

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CD SECTION

• AM IF/RF

Signal generator: 400 Hz, 30%, AM modulated

*1. Input: Antenna, Output: TP302

*2. Input: Antenna, Output: TP301

TUNER SECTION

fL: Low-range frequency

fH: High-renge frequency

AM IF 450 kHz 1,720 kHz T351 *1

AM Band — 530 kHz (fL): T306 *2

Coverage 1.1 ± 0.1 V

AM Tracking 990 kHz 990 kHz (fL): T303 *1

*1. Input: Antenna, Output: TP301

*2. Input: Antenna, Output: Speaker terminal

• FM RF

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

FM Band — 87.50 MHz T301(fL): *1

Coverage 1.3 V ± 50 mV

FM RF 98.00 MHz 98.00 MHz L312 *2

(10-30 dB)

Test Stage

Instrument

Connection

Frequency

Display

Serring/

Adjusting

Point

Figure 14-1 ADJUSTMENT POINT

Test Stage Frequency

Frequency

Display

Setting/

Adjusting

Parts

Instrument

Connection

IC301

R381

TP302

TP301

R357

AM IF

FM IF

FM RF

T303

T306

T302

L312

TRACKING fL

AM BAND

COVERAGE fL

T301

T351

FM BAND

COVERAGE fL

TUNER PWB

CNP301

AM LOOP

ANTENNA

Figure 14-2

CD ERROR CODE DESCRIPTION

Error State Code

[Servo System Error]

0001 Cannot detect Pickup-in SW

0002 DSP access error

[Error during close operation]

0101 Open/Close SW not functioning (Low → High)

0103 Open/Close SW not functioning (High → Low)

[Error during open operation]

0201 Open/Close SW not functioning (Low → High)

0203 Open/Close SW not functioning (High → Low)

[Error during skip operation]

0302 Pickup-in SW is not detected

0306 During Disc 1 search, Open/Close SW or Clamp SW

or Disc SW do not change to low.

0307 Clamp SW not function (Low → High)

0308 Clamp SW not function (High → Low)

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 14-2

EFBL)

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

so that the loop gain at the gain crossover frequency will

be 0dB.)

* Focus gain adjustment

* Tracking gain adjustment

• Adjustment

EFBL

FDO

Stopped

CH1=500mV

DC 10:1

CH2=200mV

DC 10:1

CH3=1V

DC 10:1

500ms/div

(500ms/div)

NORM:20kS/s

=Record Length=

Smoothing : ON CH1 : 0.000V

CH2 : 0.000V

Main : 100K

Zoom : 2k

Mode : SINGLE

Type : EDGE CH1

Delay : 0.0ns

Hold off : 0.2us

CH3 : 0.00V

CH4 : 0.00V

BW : FULL

=Trigger==Filter= =Offset=

CH2

v/DIV

200mV

1999/04/05 20:26:47

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Sharp CD-PC3500 Service Manual Page 14

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