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Apply 1-hour aging to the unit and m ake sure ag ain that the IP is still in the specified
range.
Note : IP in creases as the tem perature goe s up because the resistance goes down.
After aging, the increase in value should be within 5% of the Standard Value.
Exam ple: before aging value Æ 37-38m A., suitable value after aging Æ 40m A.
If the IP rapidly increases, the Photo Diode has a problem . In this case, the Optical
Pickup needs replacing.
2.) Visual C heck
Check to see the Lens has not dropped.
If so, Focus Zero Cross is not correctly posit ioned and, in m ost cases, the outerm ost track
(TR 15) of the Test Disc cannot be play ed. Replace the Pickup with a new one.
3.) Test Disc Check: ABEX TCD-731RA
Check to see if the outermost track (TR 15) can be played.
Check whether there is only a sm all difference in Jitter values between the innerm ost (TR
1) and the outerm ost track (TR 15).
Ref erence Jitte r Value: S tandard jitte r value varies depending on the m easuring
instrum ent. It is preferable to set the value in advance by checking a known good unit.
Note : If the ABEX Test Disc has a lot of scratc hes, fingerprints, dirt, etc., the Jitter value
tends to be slightly higher.
If either of the above tw o checks (Visual a nd Test Disc) is not good, replace the Pickup
with a new one.
Serial Nu mber Ran ge: All
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