NAD 90 Manuel utilisateur
I
w
0
w
LU
I
2.
BIAS
ADJUSTMENT PROCEDURE
The
proper
bias
adjustment
is
most
important
to
assure
correct
performance
of
the
amplifier.
Bias
adjustment
is
necessary
if
any
of
the
transistors
are
replaced
in
the
power amplifier
circuitry
or
the
amplifier
exhibits
overheating
of
the
output
transistors
under
normal
operating
condisions.
INDICATOR
ADJUSTMENT
REMARKS
-----:--.—..-—-—------.
--
.-t----------
---
-
Adjust
for
0.006
—
0.015
V
across
DC
Voltmeter
VR6O1a,
b
(1
Kohm)
-
R624a,
b
(0.33
ohm)
with
NO
SIGNAL
REMARK:
Bias
can
also
be
adjusted
by
using
a
line
wattmeter.
Adjust
the
VR6O1a
and
VR6O1b to
the
point
at
which
the
line
wattmeter
shows
very
slight
increase.
3.
ADJUSTMENT
AND CHECK
POINTS
R624b
R624a
V
B
601
b
v
H
60
7.
0027
PRE-AMP
BOARD
(TOP
VIEW)
(D
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0;
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9.
0028
MAIN
AMP
BOARD
(TOP VIEW)
C
C
I,
-J
U,
I
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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_____
_______
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MAIN
AMPLIFIER
BOARD
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SCHEMATIC
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