Sharp XL-DK255 Service Manual - Page 56
Check the TE waveform at pin 16 on IC1., Focus-RF system check., Spin system check.
UPC - 074000368675
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XL-DK225 (2) Focus-RF system check. Check the TE waveform at pin 16 on IC1. If the waveform shown in Figure 4 appears and soon after NO DISC appears? No "Initialization" is possible, but play is not possible? No "Initialization" is not possible. Yes The tracking servo is not activated. Check the peripheral circuits at pins 15, 16 and 23 on IC1, and FFC1. Yes A normal jump operation cannot be completed or the beginning of the track cannot be found. Check the around pin 23 on IC1. Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1) system. 3 TE 16 IC1 4 IC1 2 RFOUT (3) Spin system check. Press the OPEN/CLOSE switch without inserting a disc, and then try starting the play operation. Figure 4 1. The turntable rotates a little? (Waveform drawing Figure 5) No 2. The turntable doesn't rotate. Yes The spin driver circuit is OK. Check around pin 25 on IC1, pins 1 and 2 on CNP2. 1 FDO 22 IC1 5 SPDO 25 IC1 7 - 3 Figure 5