Nad 312 Schematic 3

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Nad 312 Schematic 3

Extracted text from Nad 312 Schematic 3 (Ocr-read)

Page 1

OFFSET I
VOLTAGE SPEAKER
Kc 4 L 4 J A o :>+38v P401
011 R411 I" 1 .
1N414a 22° 425 0405 4v t H (>433v I 0445 {0) §
390 865588 LEFT
r"- I R415 "437 0437 J2 T 10n +8OI-20% 2
68 F J 4 . _
_ 330 111 10% ___[__ Q)
1" -- C411 0403 0407 l START 33 3
R405 1 0403 - 1n 805558 80139 ' LK39 GROUND * _I_ <9
390 1014148 R435 LINK ?' Faisal-20 mam
I 23:9 9349109 02225 390 I? T 4 _ @ +
0--V\, a JV 4 4x, I] 0 I {F r 4 1 4 04:45; -L 0:048
R417 . I -- 1
m cm W 13* "m < A 9435 m;- 2
22" R421 R423 _L. 82° F
MN" m 1M 1K5 m 0401 --- $24923
0410 L401
__ C429
8401 0405 c407 47m§1m "IT 1000 R453 < -- BREAKER HEADPHONE
22 ms 320p 180 F #9401 4455
2.514 9 r
7 =- 9 Rig/1 . i 1 A A #57 W401
' ' HEADPHONE
_ R463
R461 2%) '-' "(81m {A33 FP 1W4 220913331:
220K I, O 3% :F 5 I! L 0433 V
V . 0421 R460
33v i 0301 0803 33v 7 47p '=: 6427 IM& 2:31F 04? "' law-20% 22° 1/2W 1 :w A
- '7 + -
A was 1mg A 2:27 R447 47/25 cunnem 23 R457 __ 0403: M56 0 ,
0306 '
i $11.2 m mm W 3807 film x "(2 112w Wk 4* fig 821; I 10 FP 1W4 «101-2091. P402 @455
4v 41:» :3 11(3 415* V 22° 50 4> 33v < 0450
P rf f .
8809 3-- 0439 1 C449 0451
13K 0901 _ . Fm: . I 1.110% T 0441 _L 18289 I :02991 22009
I 22/10 1' 0°03 -- C417 '2 015 M i >-28v I 41171093 : 353 ° ° 10%
T 22/10 I 7-100" 2200/83 8449 7 .1452
.7. 3 2 1 7. .0. __ 1K2 1/2w - ? .
LE: ill F F 5" T
SW801A MI)- GROUND
T0 RIGHT soncup TO RIGHT CHASSIS
POWERAMP POWER AMP
LEFT POWER AMP
OFFSET
VOLTAGE
a: T 1, . I : >+38v
0412 F302 I R420 0405 A l I
1N4148 $ 390 mm f 4w I 9 1 1>+33v
R416 R438 cm
330 63 F 1n 10% I c444
0412 4711
2;: 0404 I 0408 l ?
0404 I" 805568 80139 55 < | U
"44148 I am 1 LINK
0420 390
33?? P v
A + w r If k 6 I 6 4 9:35:69
R418 0414
27K 4 11440 0415
R422 2 "p 04!) 0424 820 F < A 2803519 RESISTORS:
33091096
4: 23 1 $2302; A 4- 22" 0409 A 002 F - FUSIBLE
c430 30 54°? N" FP FLAME PR F
C408 0403 Y j =10011 R454 < 0432 BREAKER " 00
ms T 820p 47°FP1W' 130 F 100 I. I UNLESS SPECIFIED ARE CARBON FILM.
I T L W T I J A I »
_ "(8 112111 R484
'- 4 A33 FP 1w: 3
.0 R434 04'22 T A 1 * R455
7' 47,, ' . R442 I 1 0413 _L
rt:
43 .4.- C428 IDLE 270 F 23.41388 0434
247128 9448 47/25 CURRENT 0414 1423/"2095 -
1K21/2w I at? "" R448V * 2S8s49 C436
m 4 W m. .
I 0440 C442 #:8014096 E c B 8 c E c 8 E
. 1n 10% 258549 u
:: c413 0416 V T >48" I 709 r3281: 1mA 280669 2841386 acsso
1008 2.200183 K2945/gw -...- 80139 2503519 80555
NOTE: 1 . RESISTORS, UNLESS OTHERWISE SPECIFIED ARE 1/4W.
. 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED ARE 50V, 5%.
3. BLOCKED TRANSISTORS ARE MOUNTED ON MAIN HEATSINK.
RIGHT POWER AMP

4. COMPONENTS MARKED WITH "A" ARE SAFETY CRITICAL PART
5. COMPONENTS MARKED WITH " # " ARE ELEVATED FROM PCB.

HEHI'IdINV HSMOd

Page 2

SCHEMATIC DIAGRAM
PREAMP

F >+28
I; 11131 __ 0127
0123 1 470 -- 0.1.11:
220/33 __ 1301-2031.
"' 129
2521815 31/50 313:?
41 1
11 3127 365 T V '
as; 150 100
.1201 4 * 107 ("2'1131 --
11123
mono 180 MP 1193923 --
1 0121 = '=
5-: 47/25 0103
912 1114148
0107
v v K
EXTERNAL E .1103? 2541015
11110110 T3,?
GROUND
TERMINAL 1 l 41 >23
I 0125
0.1uF
-.:- +30/-20%
.1203
00
1205
VIDEO
11313 =1, 0321
10323171 4 P 0327
I 10011 swaomA
R315 "-'.-'-" +80/-20% TONE DEFEAT
6K8
.1209 0305 3
AUX P-K 2301315v 2 ° 1323.25 1' @8331"
R3" =5 0313 11361
15" .11- 47/25 2K7MF
.1211 ' T < 2319 - "" 03
V $2114 VOLUME -.- -.-
TAPE1 MON 11353 J- 0339 TAPE1 1133911 l 0307 0301 2333 2193933 ME OUT
1K 100p 20M 1000 1 1114143 . V . .
_ k R3390; T p 0 HI 0 I 9- 1*
* 0301 0315 ._
.1213 V 1 I'r v 1 { 305300 1 °303 100/25 = 0317 "329 *
TAPE2 11355 f 0341 RI 3 1 x 0301 "148 232 8" 0323 3191111
" ° 1:11;; "9" 1119 m 1.323 I" 1135
._ :: p
.1215 7 ' 52 $32 $383 .___| 11141411 0307 < 1x "I
V l 6 5 4 10% 2511101511
1411152 1150 113s: 0343 . msaLe BASS
1 10° 0303 113414 )t +11 RI R340A
___ 230131511 10.: 501(0
.1217 G ,V. ' 1 0311 =.__
1111151 REC 11359 .L 0345 7" v . ml 1*? 11325
I °°" 11°: cm < ilk-5
1 32
...; R317 ¢ .1- 00" 70" fighF
10K ?
TO 1110111 =..-. 0319
11112111111 mm
W .L
840111101
LEF I PREAMP 1111304
TO PSU 10I :MUTE > 11 1%
o >+28
- 0124
0.1uF
_____ «aw-20%
L102 C126
3.7mH 611;?
114 0110
1:132 2411I 5% «also/1.
11110233 V ' II
104
833% 2588111 13311521: 11FI<1
11114 4v v
47K
22 1III 0112
22013.3 2341015
T l L >-2e
11110110 0130 ~-
0.1I1F
4 +30/-20% "-5
.1204 320413
JV
CD R348 1 0332 CD
1" 100p
:- 4 $2068
J2 V F:
VIDEO 11343 I 0334 _. VIDEO
1" 100p --o "£2; 12 0322
"7'. 52030 V ,r «>123v "" 47/25
J2 Q N TUNER T0 LEFT
TUNE 11330 I 9336 PREAMP P := $323 swam-1B
________:[ 1000 COMPENSATION >- ggga 337.20% Tom; Daren ,
.1210 V T {a 52303 0306 =3"
J" 11352 I. 0333 AU F-K 230131511 2332" 2:133:11 R606
K 1000 32 =1, 0314 11332 < 22M
:1 15" up 47/25 2K7MF
.1212 .4. 4 .____._._... " < @320 _____ __ .1303
v 1 0 VOLUME ' ' E 5 om
14115114011 354 J- 0340 $31331 113390 __ 3 1 0302 '23; Tit
1K map 20101 $339 1114143 1 . .. ,L A
_ 12%? + I ' P a 0310
- 0302 0313 251(303 .-
1214 a JV 3 5500 0304 11322 -- 0313 ¢ F1330 1
TAP 3330 I. 0342 t 9 7 0132 K 130 * 1114143 68 025 T- 180 0324 3K9MF
'K 00 6 32140 470" ' 0310 1 32 82"
__ AP =_-_ 150 0300 H
.1210 E 2 515:1: 5336 H 1114143 0303 < 1K '-II-
141152 REC 11333 I 1 1 1 10 25410151/
' 111 $333 2 ' 1* 7111501.: 0433
0304 t 0 vn3408
1? 230131511 T323 3 , 4< 15ch
TAPE1I12E18 _f_ .3
9360 (:345 V I L ->-28V
1" 100p $3.290 ' <: $336 '_II"-
-=.- . 4°33: 4 11332
330111
= 0320
RIGHT PREAMP _°°" I:
MF - METAL FILM W W
NQTE: 1 . RESISTORS, UNLESS OTHERWISE SPECIFIED ARE 1/4W. 0 UNLESS SPECIFIED 22:10:35 0 a s c B E
.
_ 2. ALL CERAMIC CAPACITORS, UNLESS OTHERWISE SPECIFIED ARE 50V, 5 /o. ARE CARBON FILM, 2301315 2311333 30530

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