Luxman K-12 Service Manual

IK-l2
Electronic
Section
Alignment
procedure]
lo.
ITEI'S
TAPE
REQUI RED
SEIECTOR
POSITION
EQ SW
I
BIAS SW INPUI SIG'IAL
ALI G\IMENT
PROCEruRE
LIMITED SPEC REMRKS
P/B Output Level MTT- 150
TIORMAI N0FX'/IAL Playback ]EAC MTT-150(Dolby
1eve1;
400H2 200nwb/tn)
and adj ust
trjrnEr
potentiorneter
to
obtain output
level of 580nV(-2.sdBn).
Ldr P/B
Gah trR:
\T.-107a
Rcl
P/B Gain
lR:
VR-107b
-2.sdBn
-0.
SdBn
Dolby
off
Output VR:
MAX.
-t
a-L ,r
'ia,{\.r,
f_
IFY'
n^<i fi^n
MTT- 150 cfiz
EX
NOFMAL
NORMAL
Mter the step
(1),
check
the
P/B output level
at the
"CIOZ"
node,
Also check that at
"EXr
node.
-2.sdBn
io.
sas'
If
rated
Ievel can't
be obtained,
arnp circuit
nay
be
sr.E-
Dolby Output
Level Check
MTI- 150 NORT',IAI
NORMAL Set
the Dolby
Sw to
ON and adjust tritrner
pot
for
Dolby level adjust to
obtain output
level of 580nV
(-2.Sdhn)
at LINE
otn
jack.
Lch
Dolbv
Gain
\R: \Rl03a
RcI Dolbv
Gain \R:
VR103b
Dolby on.
Dolby Output
Level Check
wi"th
MPX filter 0'l
MTT- 150
NOM,'AL NOFMAL
Set the Dolby
Sw to
"lrPX
filter"
position
and cleck
the Dolby
output level at
LINE OJI
jack.
Dolby
Sw
'rPx
filte/'
position. If
out
of spec,
anp circuit
nay be
sus-
Bar-Graph
l€vel
Adj ustnent
MTT- 150 NORMAL
NORMAL
Adj ust
trimer
pot
for
bar-graph
leve1 adj
ust to
obtain
0w indication at 580rnv output level
of LINE
oln.
Ldr
Bar-GraDh
Level
Adi
ust \R: \RI04a
Rah
Bar-Graph
Level
Adl
ust \R: \RI04b
odB
I
0.
sd3
(odB
level
should light
up.
)
Playback Head
Azinuth
Aligunent
MTT-
216
NOFI'|AL
NORN{AL
Playback MIf-216
{3180uS
+120uS)
to reproduce
the
azimrth
aligrunent
signals (6.3kH2,
10kHz),
and
adj ust the
aziruti
adjust
screw
to obtain
the
na"tim,un
playback output
level,
Also
dreck,
nonitodng
{l oscilloscope,
if there is no
phase-shifting between
L and
R
charmels,
Playback
EQ
Adj
ustrnent
MTT- 216
IIORMAL NORI'(AL
Plaltack MTT-216
to ciec-l( that
the
first stardard
siq-
na1'(3t5Hzl should
be at
-5.Sdln
I
0.sdBm.
Then
reprcdrce ioldlz
signal, and a+j
ust
P/B EQ trirmer
to
obtain outDut
level
of
-25.5 -0.5d&n.
Lch
P/B
EQ
trirrEr
pot
:
VR-108a
Rch
P/B
EQ
trirner pot
:
\R:108b
10Klz
output
,
teve-L: -15.5 -
0.
sdBm
Dclby off

Luxman K-12 Specifications

General

Brand	Luxman
Model	K-12
Category	Cassette Player
Language	English