CD converter (box of much dish CD) circuit breakdown can appear all sorts of evidence, according to the expression of these breakdown, can judge the place of breakdown well and truly, reduce wrong judgement, raise maintenance rate.
With the breakdown sign that all sorts of blemish projects concern:
1, radio frequency n (the size that RF eye pursues) - -- RF by arrive greatly small, read dish by arrive normally cannot broadcast
-- sound reproduction is normal, but apt after sensitive to nick, sound shakes, can return to normal very quickly- - normal phenomenon;
-- after sound shakes, restore incline to Yu Yanchi- - it is not quite normal to begin some;
-- TOC numerates what need time to certain CD defer;
-- numerate in TOC during the search, CD rotates, but search course to be not stabilized;
-- during TOC is searched, the begin of the first optical track begins easily to broadcast, bareheaded moves along what slide makes a round trip. Return sometimes
From which begin to undertake;
-- CD shakes, search mark to cannot undertake;
Appear when these abnormal conditions, it is good to should check CD laser above all, possible word, adjust focusing gain. Next the focusing circuit related reexamination.
2, the deflection that seek path (the size of TE weaveform) -- TE by small arrive big, the ability that seek path by arrive normally cannot undertake
-- normal circumstance but normal sound reproduction, but when high temperature (the above when 60 ° C) cannot sound reproduction- - normal phenomenon;
-- the CD that has nick dish sound reproduction ability was reduced;
-- even dinky dirt also can cause sound high speed to give off;
-- during be being searched, operation of the end that seek path slowed;
-- during be being searched, seek path and did not end well;
-- prejudicial CD can work far from;
-- during TOC is searched, the servo that seek path will not be activationed, cannot sound reproduction.
Appear when these abnormal conditions, it is good to should check CD laser above all likewise, possible word, adjust the gain that seek path. Next the circuit of the servo that seek path related reexamination.
3, laser electric current (the electric current of laser is worth) -- should with nominal value close, ability is normal.
-- laser diode gives off light far from, and sometimes the sound that audibility laser head touchs those who attack CD CD- - laser diode already was attacked
Wear, stimulate bareheaded to already damaged;
-- laser diode gives out very faint light only;
-- the change that is less than function in the observation below most circumstance, those who stimulate photocurrent and laser head is nominal value close -- normal affection
Besides;
-- those who stimulate photocurrent and laser head is nominal the value has deflection, but still but normal sound reproduction- - laser head guarantee against long-term reliable.
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