Thank you for your shop manual! Your help was very useful - the device is repaired! Once again - Thank you! I wish you a successful business! Edward (Russia).
Text excerpt from page 16 (click to view)
Does pulse of L = 1.65V and H = 3.3V develop at pin 131 and L = 0V and H = 1.65V develop at pin 132 of IC502? Y Y Check signal process system following to IC503. Does RF output higher than 1.5 V(p-p) develop at pin 45 (TP515) of IC501 ? Y N
Disc playback is NG (DVD).
Is PLL locked? (Refer to waveforms.)
Check peripheral circuits of IC502 and IC601.
Check IC501. Lens cleaning.
Pin 57 of IC501 = 2.4V Pin 58 of IC501 = 3.0V
Pickup mechanism replacement
Y Check peripheral circuits of IC502 and IC601. Check peripheral circuits of IC501and IC502.
PLL works as a servo loop to generate a clock signal for reading RF signal binary data. With the PLL locked, the eye pattern is identified clearly when triggered with the read clock PLCK.
DVD RF signal DVD playback waveform
DVD RF signal Pin 45 (TP515) of IC501 DVD RF signal Pin 45 (TP515) of IC501