Teac CD-3 - Page 8

CD-3
4-1-1 Checking the pickup actuator operation
Before loading the disc, turn the power ON and check
that the pickup actuator moves up and down three times.
(if the pickup is not at inside on the disc, perform the
above operation after moving the pickup to the inside.)
4-1-2 Adjusting the PLL frequency
1. With the tray open, connect the frequency counter
between TP3 and TPG, and short circuit between TP4
and TPG.
2. Adjust V405(VCO) so that the PLL frequency is
4.3218MHz + 0.05MHz at the stop mode.
For this, use a X10 sync probe with the frequency
counter.
4-1-3 Tracking balance adjustment
1. Connect the oscilloscope between P405-1(TE) and
P405-6(GND), and press the SEARCH (<dor>>)
button.
2, Adjust V401(1T.B) so that the upper and lower
amplitudes of the tracking error signal waveform
become equal above and below OV.
4-1-4 Focus offset adjustment
1. Connect the oscilloscope between P405-5(RF) and
P405-6(GND).
2. In the play mode, adjust V402(F.B) so that the
waveform on the oscilloscope becomes maximum.
3. After adjusting the focus offset, stop the player. Check
for an offset voltage of 50mV or less at V403 center
lead. If reading values are out of spec, adjust V402
again.
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Fig. 4-7