Panasonic JU-253-T

(5) After performing adjustment on items 1to4, reconfirm the following:
CD Recalibrate to track 0
® Step in for 40 steps.
@ Check the alignment waveform.
9.1 O Asymmetry Verification
( 1) Insert a data diskette.
(2) Step to the track specified in the Asymmetry item of Table 8.1.
(3) Set the oscilloscope as follows:
CH1 Read Data (No. 30 Pin of CMOS/TTL Adaptor)
CH2 T1
Set time base to 1 µs/division and vertical deflection to 0.2 v/division.
(4) Write 1 F.
(5) A read wave form is displayed on the oscilloscope as shown in Fig. 9.9.
(6) Confirm if it satisfies the value as shown in Table 8.1.
Fig. 9.9 Asymmetry Waveform
(Asymmetry Wave form might be reversed up-and-down from model to model.)
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