Nikko alpha ii Schematic

Page 1

Ul

MAIN AMP CIRCUIT BOARD (BOTTOM VIEW)

(23 Q
, . L-CHANNEL RCHANNEL
._ CD To mm TERMINAL L (D To mm TERMINAL R PROTECTOR CIRCUIT BOARD (BOTTOM VIEW) mETESMSaIEfiH CIRCUIT BOARD
(GROUND) (GROUND) <- «I . « . , , v , q r-2 ' I x
f 1 (9 To INPUT TERMINAL L (3) To INPUT TERMINAL R ' rt (9 <27 i' G G 3) ®
: (8) To REGURATOR C.B.@ (3 To REGURATOR C.BI® : 7 O,
4 To C1 (-3 (D To C: e T : mm... 51
8 To oauzseeom C (5) TO oaRlzsasoO) c (I) «a 7' f M\ 33
© To oalesssoo) s (6) TO oanlzsssoo) a ' .1 ' f {m I" '
® To OSlesBsoo) E @ L2 ,,,,,,,,,,,,, ,4, _ g «I it
To PROTECTOR c.s.@ (1) To PROTEC OR CB. 5 3" xix g .gr- é 0" 3
(9) To 01 L(25C1$27) E 0 To omlzscum) E 61 ;~ 53) a"! )1?
6}) TO OIlesC1627) c (D To 01R12SCI627) c an , ' ' ." ,
' ® TOO1L2SC1627) 8 C} To 01Rl2SC1627) a J .« . v 5 U ,V . ° l ,.
® To EARTH LUG {2) TO EARTH LUG © ' .. I v I r I: '3 , I, x, i
63) TO PROTECTOR c.a.(D ® To PROTECTOR OR (2) (73" a»? * n " ~ " ~
® To TEST POINT ® To TEST POINT A: " I 9 0
® (FOR IDLING CURRENT ® 1 (FOR IDLING CURRENT O l -------- . - _ ~. 3 O
ADJUSTMENT) ADJUSTMENT) " " ' 4L Wm , 1 ~ . - .
(9 TD O2LI250555) E ® To ozuzsosss) E 7 r1 I " ' ' '
® To 02Ll250555l 5 ® To olezsosss) n ® 7) -3 ®
® TO ozLIst-sss) C ® To 02Ll250555) c
@ 7° C39 ® T0 049 4; TO MAIN AMP on. (L) 1'; ® (I; TO THERMOSTAT
® To EARTH LUG ® To EARTH LUG (f; To MAIN AMP c.a. In) (13) «12 TO SPEAKER SWITCH
;32 T° (9 ('3 T° METEE SWITCH (D To PROTECTOR on 1;
U4, To MAIN AMP C.B. (L) O, c.a.@ ,,
[5; To MAIN Amp c.a. (may (I; To SPEAKER SWITCH @ 7° PROTECTOR OR 3
:5) To RECURATOR c.a. ® {I} To METER SWITCH % I: magiclg C's;
» To EARTH LUG L OS. 3
g 9, To THERMOSTASI', HE To MET(EDR SWITCH @ To METER "9
V , f f b c 3 ® (6) To METER IRI©
a as fit an 4: @- o o to n To 1 a) O as) m II» II) ' 6) To METER (RIG

RT channel measured voltage across R732 : .8 mv RT channel measured from R732 to term 5 on Protect CB: 0.375v
LT channel measured voltage across R732 : .2.6 mv RT channel measured from R732 to term 4 on Protect CB: 55v