JVC UX-P400 Service Manual

(No.MB262)1-31
SECTION 5
TROUBLE SHOOTING
5.1 Flow of functional operation untill TOC read (CD)
Slider turns REST
SW ON.
Laser ON
Detection of disc
Automatic measurement of
Focus S-curve amplitude
Automatic tuning of FO offset and TE offset
Disc is rotated
Focus servo ON
(Tracking servo ON)
Automatic tuning of
Tracking error balance
Automatic measurement of
Tracking error amplitude
Disc to be
braked to stop
Tracking
servo
on status
Tracking
servo
off status
Disc status
to rotate
TOC reading
finishes
Automatic measurement
of TE amplitude and
automatic tuning of TE
balance
500mv/div
2ms/div
Fig.1
Approx. 3sec
IC601
20pin(TEOUT)
Approx.
1.4V
VREF
Power ON
Disc play Key
Confirm that the Focus error
S-curve signal at the pin32 of
IC651 is approx. 1.4Vp-p.
Confirm that the signal from
pin22 of IC651 is 0V as a accelerated
pulse during approx. 640ms.
Confirm the waveform of the
Tracking error signal at the
pin20 of IC601(one side of
R604) (See Fig.1.)
TOC reading
Check Point
Confirm that the voltage at
the pin68 of IC251 is 0V.
(ON: 0V)
Automatic tuning of
Focus error balance
Automatic tuning of
Focus error gain
Play a disc
Confirm the eye-pattern
at the pin5 of IC601
Automatic tuning of
Tracking error gain
Tracking error waveform at TOC reading

JVC UX-P400 Specifications

General

Brand	JVC
Model	UX-P400
Category	Stereo System
Language	English