Sharp XL-3700 Service Manual - Page 39
Check as stated in item SLED MOTOR OPERATION FAILURE.
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Page 39 highlights
• Track search failure XL-3600 XL-3700/C Does the sled motor run in FF/REW state when the SERVO Check as stated in item "SLED MOTOR OPERATION FAILURE". TEST MODE "STEP1" is set? No Yes Is the following wave output to the pin 34 (TRO) of IC801 during track search in normal playback? IC801 failure. No Yes TRO Is the following wave output to the pins 11 (TEO) of IC802 during track search in normal playback? Yes TEO TEI TEZI Check the PWB pattern between pin 34 (TRO) of IC801 and pin No 25 of IC803. Check the PWB pattern between pins 26 and 27 of IC803 and Optical pickup. If OK. Optical pickup failure. Is the above wave output to the pins 31 (TEI) and 32 (TEZI) of IC801 during track search in normal playback? No Check the PWB pattern between pin 11 (TEO) of IC802 and pins 31 and 32 of IC801. If OK. IC802 failure. Yes Is the following wave output to the pin 27 (RFZI) and 28 (RFRP) of IC801 during track search in normal playback? Yes RFRP Check the PWB pattern between pins 22 (RFO),17 (RFRP), 19 No (RFGO) and 20 (RFGC) of IC802 and pins 24,27,28 and 36 of IC801. If OK. IC802 failure. RFZI Normal. • Sled motor operation failure. Is following sled feed signal output the pin 40 (FMO) of IC801 when FF /REW key is pressed after the CD TEST No MODE "STEP 1" is set? Yes FF REW FMO C801 is faulty. Is following sled feed signal output the pins 3 and 4 of IC803 when FF /REW key is pressed after the CD TEST MODE "STEP 1" is set? Yes FF REW SL ± Check the PWB pattern between pin 40 of IC801 and pins 3 and 4 No of IC803. Is sled feed signal output the pins 1 and 2 of IC803? Yes Is sled feed voltage applied between both terminals of sled motor? Yes Check the CD mechanism (periphery of sled motor). If the sled motor does not run when DC2.0V is applied to both terminals of sled motor, the sled motor is faulty. Check the peripheral parts of IC803. If OK, IC803 is faulty. No Check the CNW802. No • Sled servo failure. Is following sled signal output the pin 40 (FMO) of IC801 during playback? Yes FMO IC801 is faulty. No Normal. - 39 -
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