Sharp XL-HP515 Service Manual - Page 41
Check the TE waveform at pin 17 on IC1., Focus-HF system check., Spin system check.,
View all Sharp XL-HP515 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 41 highlights
(2) Focus-HF system check. Check the TE waveform at pin 17 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. XL-HP515 The tracking servo is not activated. Check the peripheral circuits at pins 16, 17 and 22 on IC1, and Yes FFC1. A normal jump operation cannot be completed or the beginning of the track cannot be found. Yes Check the around pin 22 on IC1. Data cannot be read. Check the VCO-PLL (Pin76~80 on IC1) system. Stopped CH1=10 V DC 10:1 T CH2=1 V DC 10:1 100 ms/div (100 ms/div) NORM:100 kS/s TE 2 T DRF 1 (3) Spin system check. Press the OPEN/CLOSE switch without inserting a disc, and then try starting the play operation. =Filter= Smoothing : ON BW : FULL =Offset= CH1 : 0.0 V CH2 : 0.00 V CH3 : 0.00 V CH4 : 0.00 V =Record Length= Main : 100 K Zoom : 2 K =Trigger= Mode : NORMAL Type : EDGE CH1 Delay : 2.924 ms Hold off : 0.2 µs Figure 4 1. The turntable rotates a little ? (Waveform drawing Figure 5) No 2. The turntable doesn't rotate. The spin driver circuit is OK. Yes Check around pin 24 on IC1, pins 3 and 4 on IC2, and CNW3. Stopped CH1=200 mV DC 10:1 T CH2=500 mV DC 10:1 T FDO 2 1999/04/07 09:51:15 500 ms/div (500 ms/div) NORM:20 kS/s 7 - 3 SPDO 1 =Filter= Smoothing : ON BW : FULL =Offset= CH1 : 0.000 V CH2 : 0.000 V CH3 : 0.00 V CH4 : 0.00 V =Record Length= Main : 100 K Zoom : 2 K =Trigger= Mode : NORMAL Type : EDGE CH2 Delay : 2.924 ms Hold off : 0.2 µs Figure 5