Sharp XL 1700 Service Manual - Page 39

XL-1700/1700C • HF error. Is output (tracking error signal) obtained at the pins 31 (TEI) and 32 (TEZI) of IC801 the CD TEST MODE "STEP 4" is changed to "STEP 5"? Yes test mode "step 4" test mode "step 5" TEI TEZI Is output obtained at the pins 3 and Optical pickup failure. No 8 of CNP801/CNW801. No Yes Check the periphery of IC802. Check the PWB pattern between No pin 11 (TEO) of IC802 and pins 31 and 32 of IC801. Is it normal ? IC802 is faulty. Yes Check the PWB pattern between pin 34 (TRO) of IC801 and pin 25 of IC803. Check the periphery of IC803 and CNP801/CNW801. If OK. Optical pickup failure. Is output (HF signal) obtained at the pin 24 (RFI) of IC801 Is output obtained at the pins 4 and Optical pickup failure. when the CD TEST MODE "STEP 4" is changed to "STEP 5"? No 5,6 of CNP801/CNW801. No Yes Yes test mode "step 4" test mode "step 5" Check the periphery of IC802. RFI Check the PWB pattern between pin 19 (RFGO) of IC802 and pins 24 (RFI) of IC801. If OK. IC802 is faulty Is output (HF signal) obtained at the pins 27 (RFZI) and 28 (RFRP) of IC801 when the CD TEST MODE "STEP 4" is changed to "STEP 5"? Yes test mode "step 4" test mode "step 5" RFZI RFRP Is the following wave output to the pin 41 (DMO) of IC801 when the CD TEST MODE "STEP 4" or "STEP 5"? Yes test mode "step 4" test mode "step 5" DMO Check the periphery of IC802. No Check the PWB pattern between pin17 (RFRP) of IC802 and pins 27 (RFZI) and 28 (RFRP) of IC801. If OK. IC802 is faulty. Check the periphery pins 15~19 of IC801. No If OK. IC801 failure. Normal. • No sound. No sound from both L and R-ch? Yes Is +3.3V applied to pin 51 (DVDD) of IC801? Yes Is signal of pins 50 and 53 of IC801 output? Yes The main PWB is faulty. Check the interval between the pins 50 or 53 of IC801 and the pins No 2 or 5 of IC101. Check the PWB pattern between pin 51 of IC801 and Q808. No Check the peripheral parts of IC801. If OK, IC801 is faulty. No - 39 -