Luxman K-12 Service Manual

NO. rlIl'ts
TAPE
MQUIRED
SELECTOR
POSITIOI.I
EQ Sw
I
BrAS sl'l
INPI'T
SIG.]AL
ALIG\OIENI
PROCEUJRE
LI}'IITED REMARKS
8.
P/B
Frequency
Response
Adj
ust.
(nonnal
)
t{IT-
216
NORMAL
NORIIIAL
no sigral
Plaltack
MTT-216
standard frcquency
response signal
(315H2),
and
nake note of the output
1eve1.
Then
playback
the
frequency adjr.Etnent signal
frcrn
31.5H2
to inkHz.
At
this
time, the
playbagl
output levet
at eaci
frequency
should
be within
:2d&n
when the
standard
output
level is regarded
as
zero
(0).
Should
be
within:2d&n,
referencing
3l5Hz
signal
as
0.
Dolby
off
9.
P/ iJ frequency
Response
Adj
ust.
(CrO2,
Ex)
MTT.316 CrOz
EX
NOR]iiAL
Set EQ Selector
to
"CrO2"
(or
"EX'J
position.
Play
back standard
frequency
signal 315H2
of
MTT-316
(5180uS+70uS), and
rnake note of
the output level.
Then
playback frequency
aligunent
signat from 31.sFlz
to l4ktlz.
At this
tine, the
playba$k
output level
at each
frequency
should be
withir
:2d&n
r'hen
the
standard
output
level is regarded as
zero
(0).
Should
be
within:2dBn,
referencilg
315H2 signal
as 0
[zero).
Dolby
off
10.
P/B Signal- to-
Noise Adjust.
NORMAL NORMA-L Put the deck
node
without
loading
cassette
hub, and check
noi.se 1eve1 at
LINE
oUT Jacks.
Noise l€ve1
-----
no
nore
than
-50dln(R[4s)
Likewise,
check that at the
respective mode:
"CrOZ",
"E)c',
"Do1by
ol'1",
"I.|PX.
FILTER
Should be
no
lDre than
-
50d&r at each
node
11. Frequency
Adj r.lst.
of
BIAS OSC.
cfz
CrOZ Comect counter
to the current output tenrinals
of
erasing
head
lterninal
No. 19
(+),
No. 18
(-)].
set the BI.as sw. to
"cro2"
node. Ilm the BLq.s osc
coi.1 to obtajn
los}dlz oscillation
frequency.
BIA.5 6C Coil
--- L-201
Al-so check
if oscillation frgquency
at
each
I'NORMAL"
and
"Exr
Dosi.tion
is 10skHz -skHz.
Bias oSC
frequency:
105ktlz
at
CrO?
105ldz:sKtz-
At
NORMAL
&
EX
"REC'node
12.
Bias Trap Adj ust.
at
REC EQ AMP.
EX EX
Cormect Wl4vl before trap
coil at mC
EQ Al'lP
for
both
L and R ciarmels,
ard adjust trap coil
to obtain
ninim.un reading
of
vTlU.
Trap Coil
--- L-ch L-105a
--- R-ch
L- 103b
At
this
tine,
the VTW
indlcatic'n should
be no
nore
than
+20dBrn.
VTVM readi-ng
should be no
more
than
+
20dBn,
13. Bias Cunent
Adj. NOFX''IAL NORMAI
CrOz
Cormect VTW across
the
10-ohn resistor of the record
head.
L-ch
Tenri-nal No. 42
-----
(+)
Terninal
No. G.lD
----
(-)
R-ch Teminal
No. 48
-----
(+)
Terninal No.
G.lD
--- -
(-)
(l)
set
the
Blas
sw to
'lioRMAI",
and
pre-set
t}le
c1rrrent
- flow
through the
10-ohn resistor to 300!A.
Trirmer
Pot
for NoRMAL
BIAS
ADJ.
--
Lch
\4202a
Rdr
I/T202b
NOFMAL
500!A
(=3nV,
at
10
ohns)

Luxman K-12 Specifications

General

Brand	Luxman
Model	K-12
Category	Cassette Player
Language	English