Teac A-450 Service Manual page 24
Stereo cassette deck with dolby system
Hide thumbs
Also See for A-450:
- Service manual (32 pages) ,
- Instruction manual (16 pages) ,
- Owner's manual (16 pages)
Table of Contents
Advertisement
7-3-5.
FREQUNCY
RESPONSE —OVERALL—
CrO, TAPE
1.
Load a TEAC MTT-SOSTB test tape.
2.
Apply and record a test signal from 31.5 Hz to 14 kHz
at -38 dB (9.75 mV).
3.
Rewind and play this recorded section.
4.
Make sure the readings on the VIVM are within the
response limits.
5.
In case of any deviation in the High frequency range of |
the response limits, clean the heads and if this cleaning
is ineffective adjust L103/203.
Fe-Cr TAPE
6.
Repeat the above procedure, with the following ex-
ceptions.
BIAS/EQ switches:
"2" position
Test tape:
MTT-S04T
Adjustments:
L105/205
Hi-Fi TAPE
7.
Repeat the above "CrO, Tape" procedure, with the
following exceptions.
BIAS/EQ switches:
"3" position
DOLBY NR switch: IN
Test tape:
MTT-501
Applied frequencies: 40 Hz ~ 12.5 kHz
Adjustments:
L104/204
|_| TEST TAPE:
MTT-505TB (BIAS/EQ 1)
DOLBY NR:
OUT
ll
+ n
°
RESPONSE
IN dS
35
963
100
FREQUENCY IN Hz
Fig. 7-15 Overall Frequency Response Limits (for BIAS/EQ 1)
7-3-6.
SIGNAL TO NOISE
RATIO—OVERALL—
Specification:
CrO, tape: 47 dB (minimum)
FeCr tape: 45 dB (minimum)
Hi-Fi tape: 45 dB (minimum)
CrO, TAPE
1.
Load a TEAC MTT-SOSTB test tape.
2.
Place the deck in the record mode for a few seconds
©
with no signal applied.
3.
Rewind and play this recorded section.
Read the indication on the VTVM.
>
mV maximum).
6.
This —52 dB corresponds to the specified signal-to-
noise
ratio
of 47 dB (minimum):
the difference
between the residual noise of -52 dB and the specified
output level -5 dB (435 mV).
24
5. The VTVM should indicate -52 dB minimum (1.94
CONNECTION: See Fig. 7-10
SWITCH & CONTROL SETTING:
BAS
'too
Cnr
Do
"
Ma rcory
SOURCE
: q
ar
@
A
3
OUTPUT Control:
Specified Setting (See 7-1-2)
LINE Control:
Specified Setting (See 7-2-2)
MIC Control:
Minimum Setting
Trt
"Tt TT
TEST TAPE:
MTT-504T (BIAS/EQ 2)
meni NR:
OUT
a
a
a
a
CT
A
500
m
FREQUENCY
IN Hr
Fig. 7-16 Overall Frequency Response Limits (for BIAS/EQ 2)
4050
63
100
FREQUENCY IN Hz
Fig. 7-17 Overall Frequency Response Limits (for BIAS/EQ. 3)
CONNECTION: See Fig. 7-4 (B)
SWITCH & CONTROL SETTING:
Ea
PMY COPY
J SOURCE
Bias
ie
wh
,
:
2
2
Z|
e
@
Specified Control Setting (See 7-1-2)
OUTPUT Control:
| LINE Control:
Specified Control Setting (See 7-2-2) .
_ MIC Control:
Minimum Setting
'
Advertisement
Table of Contents
