NAD 90 Manuel utilisateur

BIAS

ADJUSTMENT PROCEDURE

The

proper

bias

adjustment

most

important

assure

correct

performance

the

amplifier.

Bias

adjustment

necessary

any

the

transistors

are

replaced

the

power amplifier

circuitry

the

amplifier

exhibits

overheating

the

output

transistors

under

normal

operating

condisions.

INDICATOR

ADJUSTMENT

REMARKS

-----:--.—..-—-—------.

.-t----------

---

Adjust

for

0.006

—

0.015

across

Voltmeter

VR6O1a,

Kohm)

R624a,

(0.33

ohm)

with

SIGNAL

REMARK:

Bias

can

also

adjusted

using

line

wattmeter.

Adjust

the

VR6O1a

and

VR6O1b to

the

point

which

the

line

wattmeter

shows

very

slight

increase.

ADJUSTMENT

AND CHECK

POINTS

R624b

R624a

601

0027

PRE-AMP

BOARD

(TOP

VIEW)

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MAIN

AMP

BOARD

(TOP VIEW)

-J

Transistors.

Powerboard :

TR601a A640 BC560

TR601b A640 BC560

TR 602b BC560 hfe 498

TR 602a BC560 hfe 498

TR 604b 2SC3328 (y) hfe 144

TR 604a 2SC3328 hfe 144

TR 605b C945 hfe 242

TR 605a C945 hfe 246

TR 606b A733 hfe 338 new

TR 606a A733 hfe 338 new

TR 607b BD 139 hfe 110

TR 607a BD 139 hfe 110

TR 608b BD140 hfe 117

TR 608a BD 140 hfe 117

TR 901b BC550 hfe 580 new

TR 901a BC550 hfe 580 new

TR 902b BC550 hfe 594 new

TR 902a BC550 hfe 594 new

Tone control board

TR 501a BC 560 Hfe 542 new.

TR 501b BC 560 Hfe 546 new

TR 502a C1570 (G) Hfe 339

TR 502b C1570 (G ) Hfe 339

TR 503a BC550 Hfe 651 new

TR 503b BC550 Hfe 651 new

TR 504 BC560 Hfe 547 new

TR 505 BC550 Hfe 607 new

TR 506 BC550 Hfe 607 new

TR 801 2SA684 hfe 200

TR 802 2SC1384 hfe 200

C1570 =BC 550

A640 = BC 560

A841 = BC 560

A733 = BC 557

C945 = BC 182

Ceramic caps.

Tone board.

C514 = 154k =150000 pf = 150nF = 0,15 uF = MKT 0,15

C503b = 562k = 5600pf = 5,6nF

C503a = 562k = 5600pf = 5,6nF newtone

C519 = 47pf

C506b = 47pf

C506a = 47pf

C502a = 182k = 1800 pf =1,8nf

C503b = 182k = 1800pf = 1,8nf

C505a = ,001k = 0,001uf = 1 nf newtone

C505b = ,001k = 0,001uF = 1nf

c518 = .001k =0,001uf = 1nf

C516 = 220pf newtone

c 512a= 560 = 560pf

c512b = 560 = 560pf

c513a = 563k = 56000 pf = 56nf ebay 2,50

c513b = 56nf0= 56000pf = 56nf

C526a = .0068 = 0.0068uf = 68nf

C526b = .0068 = 0.0068uf = 68nf

powerboard :

C608b = 100pf

c 608a = 100pf

c904a = 333k 33000pf = 33nf

c 904b = 333k 33000pf = 33nf

c909b = 47 pf

c909a = 47 pf

c 905 a= 333k 33000pf = 33nf

c905 b = 3335 33000pf = 33nf

c 903a =,0027k 0,0027 uf = 2,7 nf

c903b = ,0027k 0.0027uf = 2,7nf

c601a = 220pf

c 601b = 220pf

c607a = 22pf-*+

c607b = 22pf

c611a = 220pf

c611b = 220pf

c808-811 = ,01uF 4x = 10nF

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