Bionaire UX-H35 Service Manual download pdf (Page 23)

(No.MB053)1-23

SECTION 5

TROUBLESHOOTING

5.1 Flow of functional operation until TOC read (CD)

Slider turns REST

SW ON.

Automatic tuning

of TE offset

Laser ON

Detection of disc

Automatic measurement of

Focus A-curve amplitude

Automatic tuning of

Foucus offset

Disc is rotated

Focus servo ON

(Tracking servo ON)

Automatic tuning of

Tracking error balance

Automatic measurement of

Tracking error amplitude

Automatic tuning of

Focus error balance

Disc to be

braked to stop

Tracking

servo

on statas

Tracking

servo

off statas

Disc statas

to rotate

TOC reading

finishes

Automatic measurement

of TE amplitude and

automatic tuning of

TE balance

500mv/div

2ms/div

Fig.1

Approx.3sec

pin 20 of

IC601(TE)

Approx

1.8V

VREF

Tracking error waveform at TOC reading

Power ON

Power Key

Confirm that the Focus error

S-cuve siganl at the pin23 of

IC601 is approx.2Vp-p

Confirm that the siganl from

pin22 IC603 is 0V as a

accelerated pulse during

approx.400ms.

Confirm the waveform of

the Tracking error signal

at the pin20 of IC601

(See fig-1)

Automatic tuning of

Focus error gain

Automatic tuning of

Tracking error gain

TOC reading

Play a disc

Confirm the eys-pattern

at the lead of TP1

Check that the voltage at the pin4

of CN601 is 0V (a moment)?

Check Point

Check that the voltage at the

pin2 of IC601 is 0V?

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 54 55

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Bionaire UX-H35 Service Manual Page 23

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