Technics SLC 700 E Service Manual
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Extracted text from Technics SLC 700 E Service Manual (Ocr-read)
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2 TABLE OF CONTENTS PA G E PA G E 1 Safety Precautions-----------------------------------------------3 1.1. General guidelines ----------------------------------------- 3 2Warning--------------------------------------------------------------4 2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatic Sensitive (ES) Devices --------------- 4 2.2. Service caution based on legal restrictions----------5 2.3. Precaution of Laser Diode ------------------------------- 6 2.4. Handling Precaution for CD DRIVE UINT(Optical Pickup) -------------------------------------- 7 3 Specifications------------------------------------------------------8 4 Location of Controls and Components--------------------9 5 Troubleshooting Guide----------------------------------------11 5.1. Check the problem is reproduced-------------------- 11 5.2. No power --------------------------------------------------- 12 5.3. LED does not illuminate -------------------------------- 17 5.4. No buzzer -------------------------------------------------- 17 5.5. Remote control does not operate -------------------- 17 5.6. No Display ------------------------------------------------- 18 5.7. No CD operation------------------------------------------ 19 5.8. Connector pin configuration --------------------------- 20 5.9. Blocks related to each function ----------------------- 21 6 Disassembly and Assembly Instructions---------------22 6.1. PCB layout drawing-------------------------------------- 23 6.2. Removing the disc when the disc cannot be removed using the opening-closing button -------- 25 6.3. Disassembly flow chart --------------------------------- 26 6.4. SET LEG UNIT ------------------------------------------- 27 6.5. TOP AL PANEL ------------------------------------------- 27 6.6. TOP CABINET BLOCK --------------------------------- 27 6.7. SIDE PANEL (R), SIDE PANEL (L), TOP PANEL ------------------------------------------------------ 27 6.8. FRONT PANEL UNIT ----------------------------------- 28 6.9. TOUCH SENSOR PCB, PICT LIGHTING WINDOW --------------------------------------------------- 28 6.10. DISPLAY PCB, OLED ASSY -------------------------- 28 6.11. IR PCB, MAIN SWITCH PCB ------------------------- 29 6.12. FRONT PANEL ASSY ---------------------------------- 29 6.13. BELT LOADING ------------------------------------------ 29 6.14. CD MECHA BLOCK, DOOR -------------------------- 29 6.15. SPRING, CD LOADING UNIT ------------------------ 30 6.16. INSULATOR, CD DRIVE UNIT ----------------------- 30 6.17. REAR PANEL --------------------------------------------- 30 6.18. MAIN PCB ------------------------------------------------- 31 6.19. SOFTWARE IN 1 PCB, SOFTWARE IN 2 PCB ---------------------------------------------------------- 31 6.20. CD MECHA DRIVE PCB ------------------------------- 31 6.21. PS PCB ----------------------------------------------------- 32 6.22. AC INLET PCB ------------------------------------------- 32 7 Dimensions-------------------------------------------------------33 8 Block Diagram---------------------------------------------------34 9 Wiring Connection Diagram---------------------------------35
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3 1 Safety Precautions 1.1. General guidelines 1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. 2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed. 3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards. 1.1.1. Leakage current cold check 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic part has a return path to the chassis, the reading should be between 1M and 5.2M. When the exposed metal does not have a return path to the chassis, the reading must be . 1.1.2. Leakage current hot check (See Figure 1.) 1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check. 2. Connect a 1.5k, 10 watts resistor, in parallel with a 0.15F capacitors, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1. 3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potential across the resistor. 4. Check each exposed metallic part, and measure the voltage at each point. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current must not exceed 1/2 milliampere. In case a measurement is outside of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer. Figure 1