MA- 970S Service Manual
Contents
1. DIK1004 Service Manual Cautions High voltage inside player is very dangerous please make sure that power cord is cut off from power supply before opening the cover when servicing There are many high voltage components inside player pay attention to all the warning and instruction marked on the player when serving to prevent electric shock Replace only with the same or equivalent type of components according to the specifications Do not attempt to change the parameter of the components without permission in case of causing dangers 1 DK1004 Schematic Diagram Introduction of the Function Achievement IC PT2322 for 5 1CH volume and level adjustment and perform the standby and mute function well CPU utilizes IC AT89C2051 IC RC4558 or F4558 to magnify small signals and active LPF Power IC AFT9843J for L and R Channel power amplification Power IC TDA8947J for SR SL C channel power amplification SW channel power amplification uses AFT9843J to constitute BTL form Display state uses LED digital tube which range from 0 16 All functions are remote controlled Build in Cyber Logic function Round transformer bridge style and full wave rectifier circuit Satellite speaker body and subwoofer speaker body are all MDF wood structure with PVC rubber attached to the surface Subwoofer speaker adopts 6 5 inch special bass unit for double magnet and aluminum coil Adopt unified flat heat radiator with uniformly punched rectangle radiating roles a2. bove and fit on rear board directly to well radiate 2 Detailed Circuit Diagram Specifications 1 Power amplifier board mm mr Tomi ne sam as zr na Eaz ns na SLA TaN SI MO4 S006 YO S056 VIX T 6056 VIXT S058 VIA XS10 C156 C155 RI38 E 2 495052 0 2005 02 04 Caution As serving power amplifier board make sure IC is stuck to the big heat radiation board and not crooked when assembling power IC N101 N102 N106 Add splitting with silicon between the screw and power IC When fixing power IC N101 N102 N106 screws you must add an insulating washer for insulation between screw and power IC Use a multimeter to exa
3. mine the insulation Otherwise the IC will be damaged by short circuit 2 Input Board 2 3 4 mioon y u a a y 1 J as sa EE T isy TAYA DNISSIDONA TVNDIS SO96 FALSO VIVE SOV 9 9 90 3 Output Board Part zeman i mw A 91090 l 4 seca 04090 i avarnarno res VIN E mw 4 K Wa S AE 20 DE 4 H E 4 oreo eo 4 Sr oo gt o ooe evr e e eee gt o HEILER RN L Sh U U 4 Panel Board
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