N0.
ITEI'4S
TAPE
REQUI
RED
SELECIOR POSITION
EQ SW
I
BIAS SW INPTN
SIG"IAI,
AIIG'IMENT
PROCETIJRL
LI]itrTED
SPEC REMRKS
27
Record/
Playback
output
l€ve1
Greck
at
Drlby-
oN ard
-oFF
AC-22r
NOR]iTAL NORI"AL
400H2
standard
input
signal
level
(odB
1eve1
on tlte
Bar
Graph)
Apply 400H2 standard input
signal
to LINE IN and
record/p1ay-back
lt.
The^output
1evel at
LINE oUT
terninal should
be 580nV
.l
1dB
both for Dolb/
0N
and oFF
5 Solv:1dB
Dolby
Dolby
ON
OFF
AligrurEnt
of SA
at record/play-
back
AC-22r
AC- 511
netal
par-tic1e
(AC-
7011
NORI{AL
CtOZ
EX
NOFMAL
cfl2
EX
no signal tlnload the LINE
IN tendnals,
and
nake rccord/playback
of the
tape. The noise
1eve1 at
this the should
be
less than -47dBn(RISI
.
Check the noise
level
at CIOZ and EX
position
in
the
sane
nalmer.
Both at the
"Dolby
0N" and
"Dolby
MPX
Filte'I
0,1", the
noise
level should be less than -49dBn.
Reco
rd,/P 1ay -
back noise
1eve1 should
be
less than
-47dBn'(RI'S).
Re co rdl P 1ay
-
back noise
1eve1 should
be less
thar
-49dBn(RI4S).
?t)
Check
of Erasure
AC-221
AC- 511
netal
padicle
(AC-
701)
NORI,IAL
CtOZ
EX
NORI'{AL
CrOZ
EX
lkHz
+10dB
against
stan-
dard input
leve1
Apply lkHz
- SdBrn
signal to
LINE IN
ternfnal, ald
record it.
Next, rnake note of the output level.
'Ihen,
discorurect the input signal and erase the
recorded
signal. Check the output
1eve1
at the erased
portion
thrcugh lkHz band-pass
filter,
and
rnake note
of the di.fference cqpared
with that before erasi-ng.
Output Level before erasing
----- al
(den)
Output
l€ve1 after erasirtg
----- a2
(den)
Erasing
Capability
-------------- A
=
al-az(dBrn)
Take the same
procedure iI the
"Cro2"
and
"EX'
nndes,
Erasing
Capability
A
should
be
better
thar
70dBn
Use
lkHz
bard-pas
s
filter
30. 0rannel
Sparation
Greck
AC-227
AC-
511
metal
partide
tape
({c-
701)
NORT'A.L
CrOZ
EX
NORX\'IALlkHz'standard
input 1eve1
(0dB
1evel
at
the Bar Graph]
Record
lkHz about
- l8dBrn signal thrcugh
Lch LINE
IN,
and
play-back
it,
Then
neasure the rccod./playbac-k
output 1eve1
of Rch via
tkHz band-pass filter. At
the sane
tifle neasure
the record/playback output of
Lch.
Record/Playback Output
Level
(Lch)
---
af
(dBm)
Record/Playback
Output
Level
(Rdr).---
az
(den)
Crcsstalk
frorn Lch io Rch: A
=
a1
-
a2
ldB)
Likewi.se apply signal to
Rch to neasurc the crosstalk
fron RclI to Lc.h.
Take the sane
procedure
at eadl
ncde with Dolby
0,,I.
better than
3 sdB
Use
lkllz
band-pass
filter.
Dolby OFF
Dolby
ON
1t
Crosstalk
0reck
MTT- 12I
Play-back
test
tape MTI-121, and
neasure the leakage
as
per
the following
mode,
Ldr to Rdr
(lst
track to 2nd track)
Rc}l to Lch
(2nd
track
to
lst track)
better than
50dB
Use
IWlz
band-pass
filter.
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