N0. ITEMS
TAPE
REQUI RED
SEI-ECTOT
EQ $'/
|
POSITION
BIAS
SW INPUI
SIG.IAI ALI G{\4ENT
PROGnJRE
LII'{ITED SPEC REMARK
c) Never forget to check the
output level of
400H2
standard recordi-ng/playback
signal I,JtIen the
trir-
ner
pot
for BIAS adj ustnent is tumed
for aligDnent
of frequency response.
d)
Extrene
tum
of these
pealing
coil and BI/'s adj ust
\8.'s
nay ca,rse
deterioration of
distortion dlarc-
teristic or d)'nanic
range
of record/playback
outputs.
Therefore,
when these
positions
are found
extrenE,
electronic
circuit
nay be suspected.
(Check
the
operation
of the circ1lit,)
23. Adj ustment of
LINE-OUr
Bias
Trap
EX
CroZ
Connect
ml'M
to LINE
OJT and set
the node to
"mCoRD'
and
check output
of
BIAS leakage.
T\jm the trap coil
so that
the output of BI.aS leakage
nay @me to
the ninim.m.
Oreck the
output
of BIAS leakage
j.s
less than
-
40dBn
for
all
"CrO2",
"EX'
modes. In
case
it
is norc than
-25d8, re-adjust it.
"EX'
node
----- Lch
L-101a
Rch
L-101b
rrCrOZ'r
node
---
Lch L-I07a
Rdr
L- 107b
Below
-
4odBrn
after znd
lot
rlRXCr
node
Iblby off
Aligunent
of
Dolby
l4PX filter
(rgkHz)
NORMAL NOFI''AL
lgldlz standard
input level.
Apply lgkHz signal to LINE
IN.
Comect
VTt4vl to LINE
oUT te]:llf.nal and adjust
the coil for lgkHz filter to
obtain the
nfnfur.un reading on the Wi{{. Thj.s align-
nent should be done in the
"REC'
mode.
The
coil
for
Lgldlz filter:
Lch L-102a RED COm
Rch L-102b mD CoRE
19kHz output
at LINE oUT
should be
the
ninimrn
(no
nore than
-32.5d8n.
)
Input: Line
1n
Dolby MPX
Filter 0l'1.
25. Aligrunent of
Dolby MPX
filter
(approx.
105kHz)
croz
10 Sktlz
standard
input
level
Comect
VTVM to REC.oUI
telminal.
Set the deck in the
"CrOr"
Dosition
ard
"REC
PAIEE" node. Tum the coil
of
Bias Tr4 to obtain
the
njnijl['m reading on the
VTVM.
Bias Adjustnent coil-----
k$ i_133f,
Bstr sffi
This
step
No.25 nay
be onitted since this
alignnent is
done as low-pass
filter
at the coil slpplier.
When
it
is
qnj.tted,
however,
dreck that the bias
leakage at
LINE OUI
is
less
than
-45dBn
at each
"NOR!,,iAL",
"CrOz"
or
',E)C'
node wilh
tl)lbv CFI.
Bias Leakage
output
at LINE
OUT should
be
rninirun.
(no
nore than
-45dBm)
Input: Line
In
Dolby
MPX
Filter 0l'l
26.
Dolby Frequency
Response
Greck
AC-22r NORMAL NOR''AL 30
-lsldlz
-20dB
against
stsrdard input
1eve1
Apply 30-15ldlz
signal
to
LINE IN
and
dreck
the output
level at
LINE 0JT.
Thg
record/playback
output of the signal
should be
0
:
5dh,
riren
400H2
standard input signal
1eve1 is
regarded
as 0dB.
odB
1
sd3
Line
In
Dorby
chl
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