Teac A-450 Service Manual page 26
Stereo cassette deck with dolby system
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Also See for A-450:
- Service manual (32 pages) ,
- Instruction manual (16 pages) ,
- Owner's manual (16 pages)
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7-3-8. CHANNEL SEPARATION
CrO, TAPE
To
check
channel
separation (cross
talk between channels), a 1 kHz nar-
row bandpass filter should be used.
The test signal delivered from an AF
oscillator should be tuned to the filter
used.
1.
2.
Fe-Cr & Hi-Fi TAPES
The
channel
separation
checks
for
these
tapes usually may be omitted
NOTE
ATTENUTOR
Load a TEAC
MTT-5OSTB
test
tape.
Apply a 1 kHz test tone at -5 dB
(435 mV) into the left channel.
Place the deck in the record mode
for about 30 seconds....... (1)
Rewind the tape to the starting
a
poe
*—_—ws
"
cy
point of recording.
...... (2)
'
Q
@
@
Play the tape and measure
the
output level differences between
the left and right channels... . (3)
()
unless
the technician
wishes
to con-
firm that they also are within speci-
rewind
fications.
(2)
Specification: 30 dB (minimum)
7-3-9. ADJACENT
TRACK
CROSSTALK
MEASUREMENT
CrO, TAPE
NOTE
The tape must be completely erased or demagnetized prior
to this procedure.
—
=
Load a TEAC MTT-SO5TB test tape.
Apply a 125 Hz test signal at —5 dB (435 mV).
Place
the deck in the record mode
for about 30
SCCondSs:
sultaliow el diet
Rates se
aa hiked (1)
Play the tape and measure
the output level of the
recorded
portion.
Note
this reading for temporary
reference level for the following measurements. . . . (3)
Remove the test tape, turn it over and replace it in the
deck"
dues
te ee fea aae ea tartd (4)
Play the tape back and read the output level' .... (5)
Get the differences
between
this teading and the
reading previously measured of the 125 Hz signal.
Specification:
40 dB (minimum)
26
CONNECTION
OSCILLOSCOPE
DECK
under TEST
IkHz FILTER
OUTPUT
Fig. 7-20
Connection
T-392-1
SWITCH & CONTROL SETTING:
aN
COPY J SOURCE
Controls are same as
preceding section.
play and compare
mui
CJ
Blank
Signal
T-467
eee
Fig. 7-21 Channel Separation Check Procedure
CONNECTION
OSCILLOSCOPE
OSCILLATOR
LINE
IN
(Rd
Fig. 7-22 Connection
SWITCH & CONTROL SETTING:
gener
:
Fun. DOLBY aad
NR.
Fm/copy
~ SOURCE
"
rane
a
rM
4
@
on
oH
"
e
2
2
OUTPUT Control:
Specified Control Setting (See 7-1-2)
Specified Control Setting (See 7-2-2) _
* LINE Control:
: MIC Control:
Minimum Setting
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