Sony Tc Kb820s Manual
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MICROFILM SERVICE MANUAL STEREO CASSETTE DECK AEP Model UK Model Australian Model Model Name Using Similar Mechanism TC-KE400S Tape Transport Mechanism Type TCM-190VB12CSS SPECIFICATIONS TC-KB820S Dolby noise reduction and HX Pro headroom ex- tension manufactured under license from Dolby Laboratories Licensing Corporation. HX Pro origi- nated by Bang & Olufsen. ÒDOLBYÓ, the double-D symbol a, and ÒHX PROÓ are trademarks of Dolby Laboratories Licensing Cor- poration. Ð Continued on next page Ð
Ð 2 Ð Flexible Circuit Board Repairing ¥ Keep the temperature of the soldering iron around 270 ûC dur- ing repairing. ¥ Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). ¥ Be careful not to apply force on the conductor when soldering or unsoldering. Notes on chip component replacement ¥ Never reuse a disconnected chip component. ¥ Notice that the minus side of a tantalum capacitor may be dam- aged by heat. SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. MODEL IDENTIFICATIONÐ BACK PANEL Ð 3-020-983- AEP Model : 0 ¹ UK Model : 1 ¹Australian Model : 2 ¹
Ð 3 Ð TABLE OF CONTENTS 1. GENERAL ................................................................... 4 2. DISASSEMBLY......................................................... 5 3. MECHANICAL ADJUSTMENTS....................... 9 4. ELECTRICAL ADJUSTMENTS......................... 10 5. DIAGRAMS 5-1. Note for Printed Wiring Boards and Schematic Diagrams ....................................................... 14 5-2. Printed Wiring Boards Ð MD Section Ð ......................... 15 5-3. Schematic Diagram Ð MD Section Ð .............................. 17 5-4. Printed Wiring Board Ð MAIN Section Ð ...................... 19 5-5. Schematic Diagram Ð MAIN Section Ð (1/3) ................. 21 5-6. Schematic Diagram Ð MAIN Section Ð (2/3) ................. 23 5-7. Schematic Diagram Ð MAIN Section Ð (3/3) ................. 25 5-8. Printed Wiring Board Ð DOLBY-S Section Ð ................ 29 5-9. Schematic Diagram Ð DOLBY-S Section Ð .................. 29 5-10. Printed Wiring Boards Ð PANEL Section Ð .................. 31 5-11. Schematic Diagram Ð PANEL Section Ð ........................ 33 5-12. IC Pin Function Description ........................................... 35 6. EXPLODED VIEWS................................................ 37 7. ELECTRICAL PARTS LIST............................... 42
Ð 4 Ð SECTION 1 GENERAL LOCATION OF CONTROLS 1I/O (Power) button 2Remote control sensor 3PHONES jack 4Display panel 5Tape operation buttons AMS* 0 button á button AMS* ) button p button P PAUSE button R REC MUTING button r REC button 6Tape counter 7Counter buttons RESET button MEMORY button8Cassette holder 9¤ EJECT button !¼AUTO CAL button !ÁDOLBY NR switch !ªBALANCE control !£REC LEVEL control * AMS is an abbreviation for Automatic Music Sensor.
Ð 5 Ð FRONT PANEL SECTION MD ASSÕY SECTION Note: Follow the disassembly procedure in the numerical order given. SECTION 2 DISASSEMBLY CASE Unscrew the four case attachment seven tapping screws and remove the case. 1flat cable (CN801) 3screw (BVTP3 ´ 8) 5four screws (BVTP3 ´ 8) 7two connectors (CNP31, 33) 5screw (BVTP3 ´ 8) 6claw 6claw 1flat cable(CN504) 4two earth lugs 2connector (CN704) 1flat cable (CN81) 2connector (CN506) 8front panel section 4two screws (BVTT2.6 ´ 8) 6Remove the MD ass’y section to direction of arrow A . 5two screws (BVTP2.6 ´ 8)2two claws 1push the eject button.2two claws3cassette lid ass’y A
Ð 6 Ð MAIN BOARD CASSETTE HOLDER (R) ASSÕY 4two screws (BVTP3 ´ 8) 2screw (BV/ring) 5MAIN board 1connector (CN701) 4screw (BV/ring) 3bracket (TR) 2boss 3shaft 1torsion spring 4cassette holder (R) ass’y
Ð 7 Ð FITTING BASE BLOCK HEAD 2two screws (PTPWH2 ´ 23) 2screw (PTPWH2 ´ 23) Note: When installing, pull the FR belt and put around the claws as shown below. 1connector (CNP32) 3fitting base block Note: When installing, pull the capstan belt and put around the claws as shown below. 2screw (B2 ´ 10) 1connector(CNP32) 4azimuth screw 5record/playback head6compression spring 3erase head
Ð 8 Ð MOTOR 5two screws (B2.6 ´ 3) 7two screws (P2.6 ´ 2.8) 2flexible board (CNP72) 1connector (CNP71) 3claw 3claw 3two claws 6capstan motor !¼ground plate 4audio board 8reel motor 9FR belt
Ð 9 Ð SECTION 3 MECHANICAL ADJUSTMENTS PRECAUTION 1. Clean the following parts with a denatured alcohol-moistened swab: record/playback/erase head pinch roller rubber belts capstan idler 2. Demagnetize the record/playback head with a head demagne- tizer. (Head demagnetizer do not approach for the erase head.) 3. Do not use a magnetized screwdriver for the adjustment. 4. After the adjustments, apply suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the rated power supply voltage unless otherwise noted. ¥ Torque Measurement Mode Torque Meter Meter Reading Forward CQ-102C30 to 60 g¥cm (0.42 to 0.83 oz¥inch) Forward back CQ-102C2 to 7 g¥cm tension(0.03 to 0.09 oz¥inch) FF/REW CQ-201B70 to 110 g¥cm (0.98 to 1.52 oz¥inch)
Ð 10 Ð SECTION 4 ELECTRICAL ADJUSTMENTS Note:The adjustment should be performed in the order given in the ser- vice manual. As a rule, adjustments about playback should be per- formed before those about recording. The adjustments should be performed before for both L-CH and R- CH. ¥ Switches and controls should be set as follows unless otherwise specified. DOLBY NR, MPX FILTER switch : OFF ¥ Standard Record: Deliver the standard input signal level to the input jack and set the REC LEVEL control to obtain the standard output signal level. Ð Record Mode Ð 0 dB = 0.775 V Standard Input Level input terminal LINE IN source impedance 10 kW input signal level 0.5 V (Ð3.8 dB) Standard Output Level output terminal LINE OUT load impedance 47 kW output signal level 0.5 V (Ð3.8 dB) Test Tape Type Signal Used for P-4-A100 10 kHz, Ð10 dB Azimuth Adjustment P-4-L300 315 Hz, 0 dB Playback Level Adjustment WS-48B 3 kHz, 0 dB Tape Speed Adjustment Test Mode 1. Insert a short-circuit plug into TP801 (2P) and turn ON the power switch. (Earth pin &» of IC801 and turn ON the power switch.) At first, all the fluorescent tubes light up, then the system re- turns to normal display. (However, Ò00 00Ó is not displayed on the counter.) 2. To release the test mode, remove the short plug and turn off the power switch. 3. Remove the short plug after completion of adjustment. +–set47 k W LINE OUT LINE IN 600 W 10 k Wattenuator AF OSC level meter Record/Playback Head Azimuth Adjustment Procedure: 1. Mode : FWD playback 2. Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw until both of output levels match together within 1 dB. 3. Phase Check Mode : playback 4. After the adjustment, lock the screw with locking compound. Adjustment Location: Record/Playback head +–set47 k W LINE OUTlevel mete r Test tape P-4-A100 (10 kHz, –10 dB) Screw position L-CH peakwithin 1dB output level L-CH peak R-CH peakwithin 1dB angle R-CH peak +– VH+ – Screen pattern Good Wrong in phase 45 ¡90 ¡135 ¡180 ¡ LINE OUT set R-CH L-CH 47 k W 47 k W oscilloscope test tape P-4-A100 (10 kHz, –10 dB) Adjustment screw