JVC UXP5
Service Manual

UX-P5

Flow of functional operation until TOC read (CD)
Check Point

Power ON

Power Key

Slider turns REST SW ON.

Check that the voltage at the pin4 of CN601 is 0V (a moment)?

Automatic tuning of TE offset

Laser ON

Check that the voltage at the pin2 of IC601 is 0V?

Detection of disc

Automatic tuning of Foucus offset 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.

Automatic measurement of Focus A-curve amplitude

Disc is rotated
Tracking error waveform at TOC reading pin 20 of IC601(TE) Approx.3sec

Focus servo ON (Tracking servo ON) Automatic measurement of Tracking error amplitude Confirm the waveform of the Tracking error signal at the pin20 of IC601 (See fig-1)

Approx 1.8V VREF

Tracking Disc to be servo braked to stop on statas Disc statas TOC reading to rotate finishes Automatic measurement of TE amplitude and automatic tuning of TE balance 500mv/div 2ms/div Fig.1

Tracking servo off statas

Automatic tuning of Tracking error balance

Automatic tuning of Focus error balance

Automatic tuning of Focus error gain

Automatic tuning of Tracking error gain

TOC reading

Confirm the eys-pattern at the lead of TP1

Play a disc

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