Pioneer SX-82 User manual

I
SERVICE TVIANUAL
AM IFM MULTIPIEX RECEIVER
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pINNEER ELEGTRNNIG GNRFNRAjTINil
TOKYO JAPAN
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CONTENTS
I SCHEMATIC DIAGRAM
2 LAYOUT
3 BLOCK DIAGRAM
4, ALIGNMENT INSTRUCTIONS
5. DIAL CORD STRINGING
6 PARTS LIST
, 7, TROUBLE SHOOTING

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RATIO DISCRI
FM
ANTENNA
3000
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ANTENNA
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l15/23OV 50^60cps

ATIGNMENT INSTRUCTION
Please read these Instructions with extreme care before
attempting alignment.
+ Test Equipment
1) Stand-ard- Signal Generator 2) VTVI,{" DC, AC 1) Aud-io Oscillator
4) Oscilloscope 5) fl,[ Multiplex Generator
+ Attention on Alignment
1 ) Signal Generator Input: 1n every case , use the minimum
generator input that will- obtain a satisfactory output ind-ication.
2) \Mhen connectlng the test equipment to the input, use the shield-ed
wire as short as possible"
+ VTVI\/I and Oscilloscope should- be connected. in parallel at the output.
+ Alignrnent of 4lll Secti_on
+ Note: Posi-tion of Switch; SEIECTOR AIVI
MODE STEREO NOR]VTAL
Position of Volume Control; I\II1IIIMUM
p
-B)
I Signal Generat
cmutoc I
LJ rl:tr *.1 I ------ C oupl lng
Pin 1 of V-
L2
( 6ra6 )
a ',
,l;
\ -.
W
then ad-just to €
to BROAD, ad-just
SHARP position.
Pin 7
(5m6)
of Vrn
:1
;or fnpu
Freq.
455kc
rst set
;et a cu:
to fig
455 kc
L
tJ
;---'
Mod-u
l_
I
| 1kc
I tV"
the t
rve si
" 1-B"
lkc
1q"
Dial
setting
Point of
no inter-
ference as
near as
515 kc
*"d *idth =
milar to f1
From step 4
il
Connect
VTVM
-
Audr-o
output
12'
elector F
9,1-A , el
, (sl-e)
il
T,-, r-
a" tJ
top and-
bottom
Al ignment
-
Ad-just lRemarks
Ad-just to
ge t IIT"AX "
Ceflection
witch (sl-e) to SHARF,
ter that set the (Si,-A
should be set at
Tt-l
top and
bottom
lAntenna termina
, I through dummy
+ I (o.t uF)
,4
b,OU .[cc il 500 kc nL1l'L12
and T-
)
??
n
51400 kc
5 ,-r-
" I1400kc I "
rl
!l
:l
il
i1
L no further irnlrovement i
CT- , CT,
)+
iand CT-
t)
-s -possib Le

\
Noter 1) Posltion of Switchr SELECTOR FM
AFC OFF
2) Position of Volume Controlc IVIINI1vIUM
1) Connect VTVIVi and. Oscil-loscope in parallel at STEpS 9, 10"
I
I
STEPS SLgRal. Generator Input _
Coupl ing I Frequency ii\,lod_u. Dial
Setting Connect
VTVl\{ ". . Alignment
Adjum
IPin I
1/
'l'4
( 5ra6 )
of
:5':
10"7 mc
100 d.b None Point of
no inter-
ference as
near as
BB mc
DC VTV]!,T
to Pin 5
of TA
-T ',5'.
Top of
T
-4 Ad-just to get
zero volts
(between pos"
and- neg"
read.ing)
2il 10,{ mc
100 d.b il il il Bottom
of T.
/t
-f
Ad-just to get
Maximu:n
def lection
1
4
ll
*t""t t
I 11mc
I roo d-b
I
I
IEPS 1, 2
l"
I
r,nd- 1
il
everal tim
It
Uto get
Lil
I
a st_mt-Ia
Ad-just to get
Maximu-m
d.efl-ection
(Neg. read-ing) _
curve as Fig.2
5
Pin I
v__
L)
(eru5)
of
tri:
10" 7
100 mc
mc il il
DC VTVI\I
to Pin 2
of T-
tibl
Top and-
bottom
of T-
)
Ad.just to get
Maximum
d.ef lection
(N"g, read.ing)
6Pin 1 of
oLz
( 5ra5 ),1
10.7 mc
70 db il il il Top and
bottom
of T^
')
L-CL
t?
t-7
IFin 7
vtt
( 5nqe )
of
''.9
10"7 mc
60 d.b
il il lt Top and-
bottom
of T-
L-a
ll
BRepeat STIEPS 5, 5 and- 7 several time to get ?" simil ar crrr\ro 2s ficn 4
9FM antenna
terrninal 90 mc
20 db lkc
toTi 90 mc AC VTWI
to aud.io
output - .
/ nt
tl)
Lr' "j
&L,
o
Ad-just to get
Maximirm
d.ef lection
10 il 105 mc
20 d_b It f05 mc il
nm
ttr'
cr^ &
I
nm ll
11 Repeat STEPS 9 and_ 10 mtil no furth l-mprovemen
er provement 1s possible

Noter 1)
2)
1)
4)
5)
Position of Switchc SELECTCR FM IPX
il- AFC OFF
Position of Vohl_nre Controls IviINIl,[Uftl
(main volume control)
couple VTVM and- Osciltoscope in paratlel so as to observe
ripples simrrltaneously "
At Step 5, I megohm is ind"ispensable in coupling VTVTvI to
pin 4 of T.,Cj in series.
5) At steps 6 and- 7 , apply the composite signal to Flli antenna
terminal and- measurerrent must be mad-e on each right and- left
channel separately"
STEPS Clrcuit to
be ad-justed. _ Signal Generatol _lqpgj--_
Input
Signal
C oupling lilod-u" Connect
VT\|M _ . Aflgnment __
Ad-just i Remarks
11B 1- ^
-f! U
Separation
Coil
Aud-io
Oscillator
to Y-.
, "'1,
18 kc
2OO mv
( rros )None
to junc
tion
Ccno &
T_^^
L^( )')
Bottom
OI
't _ __
'ho I
Ad"just to get
l/lax" d-eflectio
Position of
VR-n-r:
)w!.
lVlinimuin
25l kc
Trap Coil il .^r- ..
,l\l ,
'.t'
6l kc
lOO mv
(rms)
ll n
" 5tl .ri.
tA-,
', )'
Bottom
of
" 'o,
Ad-just to get
Min. def lectio
Position of
VR-^. 3
)UI
n/iaximu-m
318 kc
Trap Coil il
-1\ /t
' ..+
1B kc
10v ?t '..rg
Bottom
of
L_^_
,ur
Ad-just to get
l.,{ininiu-rn
d-ef lection
Lil
il
.b,' il il c_ _
L-'-) I
)Lr
Bottom
OI
L-^
ta4
il
)Sub Carrier
Circuit
I\rlultiPlex
Generator
to Fli
Ant enna
terininal
bO db o1'
L9 kc
Pilot
signal ra"k
Pin 4
OI
rtt
'joj fT;r
fllot
- EO2
ry)"-
- 501
Ad.just to get
Max" d-eflectio
fron Tq.,< to 5
)w)
and 501 revers
repeating seve
times
6Pilot
phase It
50 d.b
Composite
Signal
each
channe I
19 kc
Pilot
lO"/" &
Sub &
iviain- ^.';
J-KC )O"/o
ar
" jzL
X-' or
r ".\;
:!
'{r '
' *t,
T
- 501
Ad-just to get
iWax. output an
l'fin, d-istortio
Confirm each
channel
7
B
9
Separation
Control
Repeat STI
"--
LJ UUJ- UU
ind-i-cator
light
t?
6 and 7
9l
Tre
it
several t
1A d.b
I O lrn
pilo t
il
MAO
L9 kc
I ( \u/^
il trp
"'5c1
un5ot
Ad-just -i;o get
I',{in. outpu-t of
reverse channe
Confirn each
channel
Ad-just to glow
1{t501 when 19
Filot signal i
n
a)I
ol rr
ral
d"
Yrt
t,
kc
S
signa,l :appliecl

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o
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trJ
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FREQ. DEVIATION
IN MEGACYCLES
Fis .2
FREQ. IN MEGACYCLES
CHARACTERISTC
Fig,3
A(SHRP)
-l"J I
' KC'FM sELEcrlvlrY
455
FREQ. DEVIATION
IN KILOCYCLES
Fig,l
DIAL CORD STRINGING
I START
9 END
CONNECT ONE END OF DIAL CORD
TO SPRING AS SHOWN
BELOW STRING AS INDICATED
BY ARROW KEEP A MODERATE
AMOUNT OF TENSION ON CORD
THROUGHOUT STRINGING PROCEDURE
TIE END TO SPRING
DR IVE SHAF T
4
3 TURNS
D-5
PO I NTER

PAETS LIST OF SX-82
CAPAC ]TORS
fn uF , IV" tolerance for all f ixed- capaci-tors,
unless otherwise noted." p = lluF
Synbol
cL e2
C1 ,4
C5 ,5
C7,B
C9,10
c1l,12
cl1,r4
c15,18
c15 r 77 ,79 ,2O ,
2I,22
c21 ,24
c25 ,26
c27 ,28
c29
c50
ClL
c52
c11 ,54
c15 ,16
C37 ,18
c19 ,40
C4I ,42
c41 ,44 ,45 ,45
c47
C4B
c49
c50
c51
c52
c51 ,54
c55
c55
c57
c5e,59
c50
c51
c52
c61 ,64
c65
c56
c57
C5B
c6g
c70
c7t
c72
c75 ,7 4,75
c76
c77
C7B
c7g
CBO
CBl
Description
Mica
Mica
0i1 paper
Mica
Electrolytic
Mylar
0i1 paper
Cerami-c
Vacant
0i1 paper
lVlica
0i1 paper
Mica
0i1 paper
Mlca
0i1 paper
0i1 paper
0i1 paper
Electrolytic
Electrolytic
Ceramic
lVlylar
Ceramic
Cerami-c
Ceramic
0i1 paper
Ceramio
Cerami-c
Ceramic
Cerami-c
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Mica
Ceramic
Ceramic
Ceramic
Ceramic
Ceramic
Mi-ca
Cerami-c
Vacant
0i1 paper
Ceramic
Ceramic
Ceramic
Cerami-c
0i1 paper
Ceramic
5oop
]OOp
0. 02
llOOp
20
0.1
0. 02
5op
0. 05
2OOp
0,05
lOOp
0"01
lOOp
0"01
o.o2
0"005
10
7
)
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ruup
1op
0"005
0. 05
0"0c5
0"001
0"005
lop
2p
1op
0. 002
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0.01
5op
1OOp
0"01_
5op
0. 01
0. 005
2OOp
ICOOp
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1op
45op
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0" 05
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Part No "
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2q"
2q"
2q,
2q'
2q,
:_q"
2q"
2q"
2q,
zd^
2q"
i
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\
CB2
CBl
C84
NQtr
cB5, 87
CBB
CB9,9O
c9I r92 rgl
cg4
c95
cg5,g7
C98,99
c100
c101
c102
Crc1
cl04
c105 ,to5
Lq" t olerance
k = kilohm,
Syrnbol
R1
R2 rJ
R4
R5 '5
R7, B
R9,10
Rl1
Rl2
R}'
CT4
R15 ,15
R17 e 18
R]-g,2C
T?'I CD
ILLL, LL
R23,24
R?_5 ,26 127 ' tO
pra )a
rLLvgL/
RlI,12
R11 ,14
R55,15
Rt7 ,38
R1g u 40
R4L ,42
R43
R44
R45
R46
R47 ,48
R49,50
Rrl-,52
R55,54,55 ,56
P,57 ,58 '59 ,50
R51
R52
Ceramic
Ceramic
C eramic
Ceramlc
Ceramic
Ceramic
Cerami-c
0i1 paper
Electrolytic
Electrolytic
Electrolytic
Electrolytic
Electrolytic
Electrolytic
Electrolytlc
Cerami-c
Mi-ca
Ceramic
RES ISTORS
L,
j watts, r-rnless
m = Megohm.
lescriptlon
Composition
Composi-tion
Composition
Composition
Composition
Carbon
Comp 'sition
Carbon
Composition
Carb on
Carb on
Composition
Carb on
Composition
Composltion
C-R network
Composition
Composition
Composition
Conposition
Composition
Composition
Composition
Conposition
Carbon
Composition
Carbon
Composition
Composition
Composition
Composi-tion
Composition
Carbon
Composition
0" c02
5op
lop
0,01
0,002
c.01
0. 002
0,002
40-20-20
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100
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2OOp
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2q"
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15ov
2JOv
25v
25v
lOOv
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{OOv
otherwise marked_ or not ed_,
Part No.
47 0k
220k
/'7 ^l1-
+/wr
100k
1Ock
4k
I tr/1]-
-L -, Vlr
100k
150k
100k
200k
ca^
a- o CIIL
100k
L7k
I I --
11ak
100k
2,2m
^ .)t-
aoLr,
100k
5tk
220k
1m
47 C ohm
100 ohm
47C ohm
100 ohm
1m
220k
47k
47k
100k
5k
o D1.
C- c Lts
5/"
2C4"

7R5t ,54
R65
R66
R57
R"6B ,59
R70
R7L,72
n-z
nl)
R74
ft()
RT5
F'l I
R7B
R7g
RBO
RBl
RB2
RB'
R84
RB5
RB5
RB7
RBE
pao
rtv )
R90
por
Lt ) L
R92
Rgl
Rg4
Rg5
I-? (JA
Rg7
R9B
R9g
R100
R101
R102
R10, ,IO4
R105
R]05
R]07, 108
R10g
m-10
R}11
Rl12
Rl1'
R114,II5
R116
R117
Rl1B
Rl1g
R120 el'zr
RIZ2
RL21
RI24,I25
Synb o 1
VR1
w2 r3
VR4,5
w5,7
VRB
Composition
Compos j_tion
Carbon
Composition
Composition
Composi_tion
Irilirewound
Compositlon
Composition
Compositi-on
Coniposition
Composition
Composltion
Composition
Composition
Composition
Composition
Composition
Composition
Composition
Composition
Composi_tion
Composition
Composition
Composi-tion
Composition
Composition
Composition
Composition
Composition
Conposition
Conposi_tion
Composition
Conposition
Composition
Composition
Composition
Vacant
Carb on
Carbcn
Carbon
Carbon
Carbon
Carbon
Carbon
lAIi-rewound
\[irervound
Inlirer,vound
V/irewound
Composition
Carb on
Vacant
Cornposition
Carbon
Carbon
27k
a a1 -
a"Lr\
5k
.) at-
a"aLt
.\ -7't -
a lrt
2.2k
20 ohrn
1m
/_7k
I I --
1m
5e ohn
4 ,7k
470 ohn
100 ohm
2 "2k
aal-
LLT\
2)V
15k
a a1-
a- o Lf\
5e ohm
2.2m
^ Al
1_ 6 a_I\
AAl
ztK
100k
47k
58 ohm
100k
^ n]
t"zK
{fO ohm
100 ohm
22Ak
2.2m
I "71-
tf . lA
a a]_
a, tK
100k
))m
L 6 CILL
220k
15k
l-5k
10k
/ ^ ^-
bUUK
47k
7 71-
) )t\
10k
15k
2,5k
1.5k
50 ohm
aa^
a_ a alIr
1k
27 Ok
1k
1k
2q"
2q"
2q" t/+
2q"
2q,
2q"
2q,
2q"
2q,
2q"
2q,
2vl Zw
2q"
2q"
2q"
2q,
2q,
2q"
2A/"
2V/"
2q,
2q"
2q,
2q"
2q,
2q"
2q"
1w
2w
2q"
Bw
4ow
2Ow
20w
2V/"
2q,
f
g
POTENf IOI,/IETERS
lescription
AUX, TEVEL 50Ok dual_ tandem
TREBTE & BASS 5 OOk d_ual tand_em
BAI,ANCE & 1\rTAIN VOLUVIE, QUADRUPTE
DC BALANCE CONTROI SOOK
BTAS ADJUSTMENT
Part No.
ARB541
ARB 708
ARBBOB
18.8541
ARB545

T
I
Symbol
t1
L2 r5
L4 rT
Ttr
LJ)
tb
LB 19
110
tl1
T1
T2
MZ
L)
r4
T'
T5 '7
TB
vl ,?
Y1
V4 15
Y6 r7 ,B ,9
v10
v}l e 17
vI2 ell ,L4
v}5
'{L5
VlB
Dr e2
D5
D4,5
D6
SELECTOR
MODE
st-1 ,2 ,1 ,4 rB
sL-5 ,5 17 ,g
PS-1
Part No.
Ar0415
ALO502
Ar0410
Ar0415
LL]5r2
AL)5O2
AL5r.05
A T430r
--- t/"
419105
ATg105
ATB105
ATB2OB
AT4101
AT6L23
ATJ22Bc
COIIS, TRANSFOR1VIERS AND CHOKES
Description
Flli ANTEJ\INA COIL
FI\,I RF CIIOKE COIL I uti
F1VI FIATE CHOKE COIL fuJl
Fl\[ RF COII
FM OSC COII
Fl\/I FIIAIffiNT CHOKE COIL I uH
FILTER CHOKE
IVilM OSC COII
am/rur rrr
AM DET, FM IFT
FlVi IFT
FIVI DET IFT
A1\{ RF TRANSFOR},/MR
OUTPUT TRANSFORMER
POVIER TRANSFOR]VMR
TUBES AND DIO}ES
12 AX7
L2AX7
5lme
71Bg-A
5cvrl4
6aQa
5w6
6yt5
5vn6
H!i-84
0470
OABl
sE*05b
t6c-4
s'--Lrli n "*p) 1rr,rr lr.,i-;-:-.1
aud io anp )
phase inv)
power amp)
FM RF amp) Nuvistor
F1VI RF gOSC 'AFC 'MIX)
\
1,U'amp'
AIvl RF amp)
AM OSC, MIX)
tuning ind.icator )
Fl\,i DET )
AM DET)
silicon rect)
selenium rect)
S\^/ITCHES
Input selector switch
lVlocle selector switch
Slid"e switch
Slid-e switch
Por,rrer swi tch ( push button )
Dial Pointer
Front panel
Dial scale
Dial pu11y
lial spring
Fuse hold-er
AC consent
Foot
Knob, input sel-ector
I0rob, mod-e
Ihob u double insid-e
Krob, double outsld_e
?ftrob, tuning
Terminal, speaker output 4p
Terminal FiVI/AlJl Ant 1p
AGr]01
AGlrlo
AS1615
AS1528
AS62U
AS6216
AS5105
AA1L47
/JlJttzL76
AL1241c
AM4102
AE4102
AKg5ol
AKB2Ol
aftr51ol
AA11t1
AA11r1
A41015
AA1016
AA101 1
AP1TL1
APJ111

7'-/
Symbol
Terminal input
Fuse 5 ampere
Pilot light
Screw, to fix metal cover
Screw, to fix bottom plate
6p
PARTS LIST OF MULTIPTEX SECTION
RES]STERS
tV" tolerance t/z% watt, unless otherwj,se marked-
k=kilohmr m=Megohm"
46
1;/
Part No.
AP2213
A81005
R501
R502
R501
R5 04
R505
R506
R507
R5OB
R50g
T)tr1r\
rL, rv
R511
R5]-2
R5T1
R514
R515 ,5L6
R5U ,5IB
R51g ,520
In uFr p=
c501
c502
C5OJ
c504
c505
c506
c507,5OB
c50g
c5 ]0
c511
c512
C5T1
C5T4
C515
C5M
C5L7
c51B
C5T9
c520
c52L
c522
Composition
Composition
Composition
Cornposition
ComposJ-tion
Cornposition
Composition
Composition
Composition
Composition
Composition
Composition
Composi-ti-on
Composition
Carbon
Carbon
47 0k
10k
1k
10k
4"7k
oat-
a ar\
10k
470 ohm
771-
) )r\
220 ohm
100k
47 0k
27Ok
1k
10k
40k
CAPAC IfORS
0. 05
0.5
2)OOp
41op
2Jo0p
20
0"01
0, 01
lOOp
41op
0.1
0"02
0.05
1000p
0, 05
0.007
15op
2J0Op
15op
2!OOp
-l tr*
J-) P
or noted_.
5%
5%
uuF lVlylar
lVlylar
Polyethylene
Polyethylene
Polyethylene
Electrolytic
Mica
Mylar
I\{ica
Po lyethylene
Mylar
Stirol
Mylar
Polyethylene
Mylar
Stirol
Mica
Polyethylene
Mica
Polyethylene
l\ilica
2q,
2q"
5%
5%
\/
2C4"
7q,
2q"
Lq"
5/,
2q"
qal
2q"
5/,
2q"
5/"
1q"
5%
rq"
5/,
rc/"
15Ov
1!0v
{OOv
{O0v
{OOv
JO0v
{OOv
JOOv
{OOv
{OOv
1)Ov
{O0v
J OOv
{OOv
1)Ov
{O0v
{OOv
{0Ov
{OOv
{OOv
{OO.r

I-
TRANSFORMERS
Symbol Description Part No.
T501 1!kc double tuned- AT9B0B
T502 1!kc single tuned. AT9BO9
T5Oj JBkc multiplier AT9B10
t501 ,5A2,
501 ,504 JBkc traP coil
COITS
TUBES
AL9B07
v501
v502
v501
Nrr0l
I rx rt,t
uuu I
5aQe
6w5
Neon light AV74C1
DIODES
D5 01 ,5O2 ,
iol,io4 ot\Blf rN14
POTENTIO]/MTERS
VR501 Separati-on control AR0011
VR502 Ind-icator light adjustment AR0012
TROUBLE SHOOTING
PO\\IER CIRCUIT
SII/IPTO}/IiS POSSIBI,E CAUSE TO BE CIIECTGD
Does not light 1) No power
up or function &o Se'rered- por\rer cabre Clreck where cable enters pJug.
bn Defective power switch Check contact point.
co Fuse blovtrn or no fuse Replace or i-nsert new fuse.
inserted
2) Fuse blows
E n Power transformer Short between transformer wind_1ngs
heat up layer.
bo Defective lnsulation
in OPT between primary
and- secondary.
co Short between electrocle Mainly in rectifier or j-n power
in tubes tubes.
d-o Defecti-ve electrolytic Mainly filter circuit.
capacitor
1) Emit s smoke
a,o short in heater wi-ring check wiring by removing tubes.
bo Defective tube socket Mainly poor insulation of wafer-
type socket.
tight uF r but
does not function
1) Insufficient plate
voltage
zo Rectifier tube or d_iod"e
burned_ out.
b. Resister in filter circuit burned. out
c" No rectifier.
2) No voltage at plate circuit"
a, Primary windings of output transformer
burned- out.

ATIIIO CIRCUIT
SY1VIPTOMS POSSIBLE CAUSE TO BE CIf;CIGI
Does not function
i) Power amplifier Eo Severed. output transformer(s)
section wind"ings (primary and- second-ary)
b . Power output tube s d-amaged or
heaters burned- out
co Plate load resisters between
each stages burned. out
d-. Bias resister in cathod-e circuit
burned- out
2) freamplifier &, Plate load- resisters between
section each stages burned out
b, Poor contact(s) in input selector
switch or mod-e switch,
c. Defective cathod-e resister
d-, Defective d-e-coupling resisters
between each stages
eo Defective tubes"
Iloises
1) Tubes e, Defective tubes
2) Resisters &n Defectj-ve plate resisters, negative feed- back
.' \ esLsters, or cathod-e resisters "
1) Capacitors &o Defecti-ve capacitor, coupling, phase compensation
circuit,
4) Potentio meters ao Noise emanati-ng from d-efective vol-ume control or
other variabl-e resi-sters"
Hum
1) Tubes &" Defective tubes, parti-culary short between
electrod-es.
2) Resi-sters D., Defective load- resister in phase inverter circult
on cathod-e end-
3) Capacitors ao Defective electrolytic capacitors in filter
circuit or in de-coupling circuit,
Distortion
1) Transformer &c Defective output transformer, output tubes or
rectif ier ( tube or d-iod e ) "
b " Short be twe en pr imary and- s e c ond-ary "
2) Capacitor &o Defective capacitor in output tube bias cj-rcuit"
1) Resister &o Defective grid leak resister
,\
4) Rectifier ae Defective rectifier in bias circuit when fixed,
bias circuit employed-.
AM TUNER CICUIT
SA,IPTOII/IS POSSIBTE CAUSE NOTE
Does not function 3.o Defective tr-r-bes
bo Foor contact or d-efective insul-a.,tion in
input selector or mod-e sv,iitch
I
I
I
I

co Burnt out resister 1n power supply
d. Severed- wind-ing(s) in IF transformer
e o Severed- oscillator coil wind.ing
f , Short of vari-able capacitor (tuning)
insid.e roechanism
g" Germanium d.iod_e in dector circuit is d_efective
Poor sensitivity a" severed. wind.ing in RF coil
b " Out of alignment in IF transformer
c o Out of tracking alignment
d-" Defective tubes
e o Poor irrsulation of trimning capacitors
Distortion ao Defective germanium d.iod-e
b. Defective tubes
co Defectlve tuning inCicator tube
d-. Defect in AVC clrcult
Noi-se o.n Noise emanating from defective tube
b, Occasional short between fixed_ plate and
rotor plate of varj_able capacitor.
c o Poor sold-ering or short between parts "
SY]VIPTO},TS
F'r,t T-LnsER qIRCUIT
POSSIBLE CAUSE NCTE
loes not functi-on D.o Defective tubes
b. Severed. wind-ing(s) ln IF Transformers
co Foor contact or defective insulation 1n
rotary switch
d-. Burnt out resi-ster(s) in power supply
€. Loose oscillation coil connectionr or
poor sold_ering
f" Poor contact between sockets and_ tube pins
g" lefective germanium diode(s)
Poor sensitivity ao rF transforners out of alignment
b, Tracking out of alignnient
c o lefective tubes
Distortlon &o Discrininator IF transforner ou-t of
alignment
b " Defective tubes
c o Defective germanium diod.e (s )
Noises includ-ing
lVlicrophonic o.o fn nost cases, d.ue to d-efective tubes in
RF amptifier or local oscillator tube(s)
b" Foor contact between sockets and tube pins.
c o Antenna input is not enough
d." Improper mounting variable capacitor
e o Poor sold-ering or short between parts,
f " Excessive long leads or resisters in RF or
IF circuits

v
-
il/iI'tTIPLEXE TROUBLE S}ICOTING AND HEPAIRS
SY]VTPTCIVIS ,i
i PIICBABLE CAUSE i 'TNPAIRS NECESSARY
t:
__i*_-_*-'_*r
i,
I I -D-ir^+ o-^"1 if-.+-- ^-;-.^,.i+ lr D^o,1 .
1 l-, Pilot arnptifying circui-t I t " lleaCjustnient (Af geOe:
Poor separation
Excessive d.istortion
in stereo reception
Distortion prevalent
at points of high
i
I
J
I
I
(Arlft in separation
control; d-rift tn 18 kc
coil1' oa' othet' faulty
I " Pilot amplifier circrrit
2, Composite circuit
(5csZ, etc. )
1. Drop in line pol4rer
voltage "
1. fnadequate pil-ot level- "
?- " Drop in line power
vol-tage.
A'IIBIC ) ;
replacenent of com-
separation control;
read.justnent of
conponents "
1- Re ad- j us tment or
replacement of
components "
2. Vicinity of 6Ce7
1. Provid-e supply of
proper voltage.
ileaCjustment ; replace*
ment of faulty
conponents "
Check power supply
section.
I " Replace 6CC7 or other
faul-ty components in
vicinity of 6CG7 "
(c.ritt in L9 kc t::ans-
forrner t cr other faulty
components) " I ponents.
I
----i-**
2. Composite c i-rcu j-t ! 2 " Read jus tment of
l"
Extreme d-rop in volume
in stereo recepti-on
l- " Composite amplifying
ci-rcuit
(Faulty 6cc7 or con-
ponents in its viainity" )
Faulty separation
control variable resis-
tor (burntout )
Severed- 18 kc coil"
6CCT " 25OOpf cathod-e
capacitor faulty.
Faulty )B kc fil-ter
( one channel only) ,
2. One of second-ary wind-
ings of 18 kc transformer
severed..
tr'arilty neon tube.
l.
Separati-on
completely
(n o change
separati-on
ad-justed-. )
control-
ineffective
even rrrhen
control
Replace
lleplace
Replace
c omponent "
component "
coriponents.
1" Replace component.
Replace component.
Poor separation on
one channel only
I
_--_i-_
Stereo ind-icator falls
to function L
a)
1o
Replace component.
ilead-just ind-icator
sensitivity control
2, Inproper worki-ng point "
+Other malfwr.ctions should be d.ealt with in the sane way as f or other arnplifies.

7/
7
r
As to the technicol inquiry, Pleose refer to:
PIIINEER ELEtrTRUNItr trORPORilTION
Audio Component Division, Ohmori Plont,
Engineering Deportment, Quolity Assuronce Section.
218, Ohmori 5-Chome, Ohtq-ku, Tokyo, Jopon.
(Kc'50 EotN) Prinled th Jcipoh