Nikko ALPHA 220 Service Manual Download Page 1 | Manualshive

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Summary of Contents for ALPHA 220

Page 1: ...ISASSEMBLY CIRCUIT DESCRIPTION 4 6 PARTS LOCATION SCHEMATIC DIAGRAM 8 C BOARD ALIGNMENT POWER TRANSISTORS MOUNTING ASSEMBLY PARTS LIST SEMICONDUCTOR DATA TRANSISTORS FIELD EFFECT TRANSISTOR DIODES LED...

Page 2: ...than 60 GENERAL Power Requirement TYPE AC120V 60Hz TYPE AC220V 50Hz TYPE AC240V 50Hz Power Consumption 480 W 620 VA Ambient Temperature during Operation 1 0 30 Specifications are su bject to change wi...

Page 3: ...IVE AMP RIGHT CH TRANSISTORS 0702 704 706 7 10 712 0714 7 I 6 718 720 722 C4 726 r POWER REGULATR 125V LEVEL THERMAL INDICATOR COMPo LED DRIVE ASS 0727 729 0808 809 LED DRIVER OVERLOAD DETECT DCDETECT...

Page 4: ...e away from the unit Photo Photo 2 FRONT PANEL REMOVAL Remove three tapping screws 1 3 from the left side of the unit as shown in Photo 2 Similarly remove three tapping screws from the right side of t...

Page 5: ...RE2 Figure 2 SEEP CIRCUIT eidle eidle I ALPHA 220 be a poor efficiency system In class AB or B operation the 01 plays the role of amplification of the plus part of the signal and O2 that of the minus...

Page 6: ...between each element has been los due to temperature rise Figure 3 2 CLASS AB OPERATION inside the amplifier The DC servo circuit is to sup press such a drift and realize a more stabilized ampli fier...

Page 7: ...ction the emitter inside the transistor is divided into many units and emitter resistors with small resistance are inserted to each unit resulting in a parallel connection Figure 3 4 OPERATION OF BARI...

Page 8: ...1 61 10 v 63 Bg I R I 8 1 2tt 85 v R710 R76 pc DRIVER PCB SCHEMATIC SYMBOLS POLYESTER FILM CAPACITOR BIPOLAR CAPACITOR 8 NONFLAMMABLE RESISTOR WARNING INDICATES SAFETY CRITICAL COMPONENTS FOR CONTINUE...

Page 9: ...ALPHA 220 ALPHA 220 P C BOARD BOTTOM VIEW Figure 7 DRIVER PC B POWER TRANSISTORS PCB INPUT PCB oeme NO ASS Y PRom 0 AD PH HEAD PHONES PC REGULATOR PC B D VER pee PDWER NO...

Page 10: ...my load resistor in a well ventilated box Further as more than 5 A current might flow in the wire connecting the dummy load resistor and the amplifier at least larger than AWG 18 thick wire should be...

Page 11: ...the printed circuit board Replacements for output and driver transistors if necessary must be made from the same hfe group as the original type Be sure to include this infor mation when ordering repla...

Page 12: ...ange without notice 5 Parts ordering procedure AND SYMBOL NUMBER A DO NOT USE THE KEY NUMBER these are control for the factory only B Include in any order a Part number b Part description c Model numb...

Page 13: ...R717 718 222 RES 5600hm W 328561J R807 111 RES 56kohm W 328563J R719 720 222 RES 15kohm W 328153J R808 111 RES 18kohm W 328183J R721 R809 111 RES 100kohm W 328104J R724 444 RES 4 7kohm W 328472J R810...

Page 14: ...10 2SA 44 TOSHIBA 2SDBB2 NPN 150 100 200 100 Complomo y o NEC Pow mp Slo mox 320 mox 2SB772 FIELD EFFECT TRANSISTOR MAXIMUM AATINGS Ab ol Moxlm m Vol ELECTAICAL CHAAACTEAIS ICSTypl Vol ITA 25 C oI0 o...

Page 15: ...o 75 ELECTRICAL CHARACTERISTICS Vcc t15V TA 25 C unless otherwise noted PARAMETER CONDITIONS MIN TYP MAX UNITS I nput Offset Voltage Rs 10kSl mV I nput Offset Current 200 I nput Bias Current 500 Large...

Page 16: ...Tokyo 158 Japan SALES OFFICE Mitsubishi Bank Bldg 3 2 Oogenzaka 1 choma Shibuya ku Tokyo 1 50 Japan NIKKO ELECTRIC CORP OF AMERICA HEAD OFFICE 320 Oser Ave Hauppauge N Y 11787 U A OFFICE 16270 Raymer...

Page 17: ...al No C6534701 and up Q701 Q702 2SK150A R701 R702 2 7K 1 K IN PUT GND C703 C704 lOOP 820P PARTS LIST DELETE SYMBOL No DESCRIPTION PART No 003 704 Ceramic capacitor 232101K 100pf 10 50V R701 702 Carbon...

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