Pioneer SX-3800 o.J ?oir, h.,r,z, nryl, r.r#, +t*r.-U, nLi,.g, aFosc,lt ,-d, i+ u t, aA.f, l t l

H

sx-3Cloo

H

8 , 3 P O W E RA M P L I F I E R

^

\' -

t

"*.u

'I'urn

(R) fulty

,*o,-,{'

{

VR3, VRb (L) and VR4, VR6

around in the counter-clockwise

,fJaJtuL6

H

direction,but set

or

^aA.f

VR1(L) and VR2 (R) to the centerpositionsWith. -

ku

/o.n 4. ?,^.

out any load or input signal, turn the POWER

switchON.

h.,r,z--"{*(

(_nry'l)

n

T

DC Balance

be-

aFosc,lt ,-d

P

**

i+> u t

r-

tween terminal no.23 and ground.

1. Adjust VR1(L) for 0V (to within t30mV)

{,-L

H

tween terminal no.22 and ground.

/.o.'J ?oir, **

Q(s,)

2. Adjust VR2 (R) for 0V (to within t30mV) be-

ldle Current

o,--"

*

r.r#

+t*<r'.-'U

T

1. ;\djusl VRB (L) for 120mV betweenterminals

J

Pos

{-n"Li,^.g^.

no,28(+)andno . 25( - ) .

2. Adjust VR4(R) for 120mV between terminals

\ ,v\

ut

*

j,

t,te ;,t; . - 1 . * . 1 .

T

no . 17(+)andno . 20(*) .

3. Adjust VR5(L) for 150nrV between terminals

no . 28andno . 25 .

T

4 . Adjust VR6(R) for 150mV between terminals

no . 1?andno . 20 .

T

R

t-r(2t

t\

VR6II

H

l t l

FI

I @ U N o . 17

R

I

:

u*oll

No . 20

I

U

I {I){a))}

t

I

I V R 2llL

No . 22

t

i

Itt-

I

l[

No . 23

I*.

V R 1

I

bt

f

No . 25

vR3ll

t*

t

I@ n No . 28

-_LvR5ll

l

t

>')6f

t!

I

I

Poweramplifier assembly

r r

Fis.8-4

e3