Pioneer ER-420 Service manual
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FM
CHARACTERISTIC
I O.7
SELECTIVITY
I O.9
ER-
42O
DIAL
CORD
STRINGING
VARIABLE
CAPACITOR
ATIGN}/ENT
INSTRUCTION
Flease
+
Test
1)
Standard-
2)
Oscilloscope
+
Attention
1)
Signal Generator
that
Z)
When
short
+ VTVjr,l
+
Note
STEPS
read.
Equipment
these
on
will
connecting
as
and. Oscilloscope
Position
s
Fosition
Signal
Coupling
Instructions
Signal
Alignment
Generator
obtain
the test
possible.
Switch;
of
of Volume
Generator
with
Input:
satlsfactory
a
shculd be
ln every
equipment
+
Aligrnent
SEIECTOR
}1IODE
Control;
Input
"
IVIod.u.
Freq
extreme
2)
case,
output
to
connected.
AM
of
AM
STEREO
MINIMUM
Dial
se
tting
before
care
use
DC
the
VTUllt.
ind.ication"
input,
the
paralle
in
Section
NOR]\4AL
Connect
VT\IM
attenpting
AC
,
minimum
use
I at
alignment"
generator input
shj-eld ed.
the
output.
the
Alignrnent
just
Ad"
wi-re
Remarks
as
Connect
Point
1kc
I
)
I
)
uF)
of
that
of
V-.'-.'
"
1
at
3,
set t
positio
V14
-.
,i,
3'
terminal-
dummy
iA
\
s-l'.
%f"
ST'liPS
4
fi
&
Pin
I
I
(5116
Step
0n
after
SHARP
at
Pin
1
4
(0rn6
Antenna
through.
(o.t
5
6
Repeat
kc
455
1q"
set
rst
re
3..
455
5oo
|*i"".--'
tt
tl
5
the
(srr)tol
lkc
kc
3w
tcc
until no further
rnd. wid.th
bt
IROAD
il
I
no
ference
as near
as
1400
of
inter-
kc
515
s
.
Fro
il il
kc
600
kc
improvement
.VT\IM
AC
Aud.io
to
output
elector
m step
il
il
ta
i
top
I
lottot
I
I I
switch
(
Sff
{,
T2
top
bottorn
Ll, Lz
CT392
crio4
possi-b1e.
is
Ad.just
i
and
get
i
aerlection
I
(
Sff
)
should be
)
and.
r
Maximum
SHARP'
to
il
il
to
set
._\
1\ote:
I)
Posltion
2)
Position
Connect
t)
Alignment
of
Switch
n
of
Volume
vfvM
and
€.FM
c SELECTOR
AFC
Section
OFF
Control; MINIMUM
oscilloscope
in
FM
parallel
at
srEps
io,
r-r.
i *r* i-
i l-
i-----r---_
llirl
-,
I
-
I
i
i i
t_-- I
| , i
-
I
-
'roJ
c""eti"s
j
ri-n I
l(eave
'
i
of
iol
_
,,
I
iltii
i-_
I
|
---
I
,
=
I ltood.b I
,, 111^':.
ili
li,il
Repeat STEPS
;;;";t;"
;;;
-[-
F"-"q.
-+---
-f-
v13
-r.
,:.
--
ro.T
i
jrood.b
mc
I
I i r
|
iro.4mci
lrocdb I I
-f------t----T
1,
2
and
LO.7
nc
100 d.b
-l
M"d;i
mor,"
I
i
I
_i
,,
1,,
several
t
-l
-i
I
'
I
___l
i
I
Dial
Setting
Poi-nt
no i-nter-
ference
as
as
neal
8B
times
of
nc
Connect
VTVM
IC
to Pin
of
get
to
ti
DC
I
to
i
of
VTVI\,[
t6
a
vTVM
Pin
T1,,..
i8,l
Alignment
just
Ad-
Top
5
sj-rnllar
I
2i
.,1
of
T5
Bottom
of
T5
rop
and.
bottom
of
Tj
Ad.just
zero
(between
and
read-
just
Ad
IVlaxinium
d.ef lection
Adjust
Maximum
d-eflection
(N"g"
culrre
Remarks
to
volts,
neg.
ing
)
to
to
read.ing)
as
fig"
get
pos.
get
get
1"
P;; i
(6ce)
Repeat STEPS
FM
antenna
terminal
5,
105
10,7
db
70
10"7
db
50
6,
T
)omc
zoar
mc
20
d.b
mc
mc
and.
r
jrr<c
iM, ]
B
several
-f-
I
90
105
times
mc
mc
get
to
AC
VflTM
to aud.i.o
ou-tput
Top
bottom
of
Top and.
bottom
of
Top
bottom
of
a
si_mj-lar
TIOLt
Tloz
L1o2
&
CT501,
crJoS
crp5
&
and.
\1
Tl
and-
Trcj
curve
Adjust
IVIaximum
d-eflection
as
to
ftg"Z
get
Repeat
STEPS
10
and. 11
until
no
further
improvement
possi-ble.
is
+Note
s
Position
1)
o\
1)
Position
1)
(main
Alignnent
of
II
of
volume
Switch:
VoJume
control)
Control
MPX
of
SEIECTOR
AFC OFF
lVfNIn[UlVI
e
S-ectiqn
,
l/FX
FM
.r,*..l i
ljr'bj-Hr
l-
I
I
circuit
ad-iusted-
l"
I
kc
18
|
Sup."ation
i
coir
I
i
.
i
to
-v:E'Y-:
i
I
-l-_.T-
Audig-
I
Oscillator
I
lto
1
+--
-
2
I
i
q
kc
il";
--F--
I
coil
I
i i
l-'----tl_l
5er."
1
i
r"tpcoil
|
i llekci
I
I I
rt i
+l
',51
I
i
ll
Caruier
Sub
Circuit
Multiplex
Generator
to
Antenna
ii
_]--
il,
iZ isupu."ationl
i i
Control
i
Sierlal Generator
coupling
)'"'"f*-p".rtt-i-i---r-:::
lSi-st""tluoa'
]---
k"
I Zl
mv
200
I
l(rms),
r:xl)i
;--r--
o"1
G7
,,
I
l?n=Ti
i-xr:l
"
. .l
lov
"r)i
lt
FM
terminal
"
il
d.b
i60
ior
kc
i19
lirot
I
signal
I
i
l-----
l.^
db
lbu
I com-
I nosite
li:-rtru.r
I""il.
l channel
l-*
I
1"
I
I
I
Input
I
--
None
I
I
I
I
I
Lo%
L9
Pilot
Lq"
Sub
I\llain
lkc
,,
"
il
kc
1q"
Connect
VTVM
junc-
to
tion
cjog
Lsoz,
C
511
Crtg
c5zt,..
Pin
of
rjoj
&
&
Ali
jus
Ad
Bottom
&
'-
,
\
I
LD,
L/
\
\*
-'
I
;; I _ :f lui-t
.i?
ir'o1
I
,.
I
of
t5o1
Bottom
of
LSoz
Bottom
Bottom
of
t
Ad-just
IViaximum
Positlon
Ad-just
Minimum
Position
iAd-
tr
I
I
grll-i--
{
iXn
" I
15or
i
l,r5oz
rlol
I
,t
jt
\v
Tnnt
I
I
vRqot
I
i
nt
Remarks
to
d-e
of
VR5
01
M|nimum
to
deflection
VR5
l\{aximum
just
to
t' def
it
-=-
"
Adjust
Max,
from
and-
repeating
Ad-just
Max.
Min"
Confirm
Ad"just
lVli-n.
reverse
Confirm
to
d-eflection
T,O5
qot
reverselyt
)vL
times
to
output
distortion,
each
channe
to
output
channel,
channc
get
lec
f
:
get
of
:
or
get
lection
get
to
several
get
and
I
get
of
each
f
_l
tion
1,O?
I
I
I
I
I
I
i
I
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