Sharp CD-BA1700H Service Manual download pdf (Page 39)

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CD-BP160W/180W/1500W/1700W

Is pin 35 (C2F) on IC2 "L"?

Yes

The HF waveform is normal and the time is displayed

normally, but no sound is produced. Or the sound has

dropouts.

(5) Others

There are too many error flags on a damaged disc which

makes error correction impossible.

Check again using a known good disc.

1. When playing at normal speed

Check the peripheral circuit at pin 37 (DOUT) on IC2 and

the waveform (Figure 39-2).

If OK, check the Unit.

When a disc is loaded, start play operation.

(4) PLL system check

The HF waveform is normal, but the TOC data cannot be

read.

Check the PDO waveform. (Figure 39-1)

Check around pins 1~6 on IC2.

Figure 39-1

Figure 39-2

FDO

PDO2

PDO1

Stopped

CH1=500mV

DC 10:1

CH3=1V

DC 10:1

CH4=1V

DC 10:1

500ms/div

(500ms/div)

NORM:20kS/s

=Record Length=

Smoothing : ON CH1 : 0.000V

CH2 : 0.0V

Main : 100K

Zoom : 2K

Mode : AUTO

Type : EDGE CH2

Delay : 0.0ns

Hold off : 0.2us

CH3 : 0.00V

CH4 : 0.00V

BW : FULL

=Trigger==Filter= =Offset=

CH1

v/DIV

500mV

1999/04/05 17:33:17

DOUT

Stopped

CH1=2V

DC 10:1

500ns/div

1999/04/07 09:25:28

(500ns/div)

NORM:200MS/s

=Record Length=

Smoothing : ON CH1 : 0.00V

CH2 : 0.00V

Main : 1K

Zoom : 100

Mode : NORMAL

Type : EDGE CH1

Delay : 2.887ms

Hold off : 0.2us

CH3 : 0.00V

CH4 : 0.00V

BW : FULL

=Trigger=

=Filter= =Offset=

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 59 60

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Sharp CD-BA1700H Service Manual Page 39

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