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4-3-4. Record Level Setting
For CrO2 Tape:
:
For Regular Tape:
13.
Installa TEAC MTT-505 test tape on the deck.
20.
Repeat the above procedure, with the following exceptions,
14.
Place the BIAS/EQ switches to the '1' positions.
for regular tape.
,
15.
Apply a 400 Hz test signal at —12 dB (194 mV) to the LINE
IN jacks.
Test tape:
MTT-501
16.
Place the deck in the record mode.
BIAS/EQ switches:
"2" position
17.
Rewind and play this recorded section on the tape.
Adjustments:
VR104/VR204
18.
Adjust VR105/VR205
to obtain 0 dB (0.775 V) on the
19.
VTVM. (Measured at OUTPUT jacks)
Continue
__the
process
of
the __ recording-rewinding-
playing-adjusting until this 0 dB (0.775 V) is obtained.
4-3-5.
Distortion Checks
DISTORTION ANALYZER
For CrO2 Tape:
i
- OSCILLATOR
The distortion factor should be: 3.0% or less.
DECK
under TEST
ATTENUATOR
'NG
Connect a distortion analyzer to the
OUTPUT jacks.
2.
Connect an AF oscillator to the LINE IN jacks, through an
.
:
:
Tra94
aitannatar:
Fig. 40 Distortion Check Setup
3. Load a TEAC MTT-505 test tape on the deck.
.
4. Place the BIAS/EQ switches to the ''1" positions.
For Regular Tape:
;
5.
Apply a 400 Hz test tone at —12 dB (194 mV).
10.
Repeat the above procedure, with the following exceptions,
6. Place the deck in the record mode.
for regular tape.
7.
Rewind and play this recorded section of the tape.
- 8. Read the indicated value on the distortion analyzer.
Test tape:
To
9.
The distortion factor should be 3.0% or less.
:
BIAS/EQ switches:
2" positions
Distortion factor:
2.5% or less
x
OSCILLOSCOPE
4-3-6. Overall Frequency Response
For CrO2 Tape:
1.
SVP
~ @
OSCILLATOR
Connect an AF oscillator to the LINE IN jacks, through an
attenuator, and a VTVM to the OUTPUT jacks.
Load a TEAC MTT-505 test tape on the deck.
Place the BIAS/EQ switches to the "1" positions.
Place the deck in the record mode.
;
Apply a test signal from 40 Hz to 12.5 kHz at 42 dB (6.15
DECK
under
TEST
ATTENUATOR
°"@ @
@°
SO Oe:
Make certain that the reading obtained on the VTVM are
I |
TEST TAPE:MTT-5O5(BIAS/EQ 1)
ae
ma
ae
m2
{~
—— DOLBY NR OUT
within the response limits.
;
il fe ee
ery
In case of any deviation in the high frequency range of the
\ HI
ee
aes
.
.
2
had
t
+
response limits, clean the heads and if this cleaning is
ant
mone
g 4
tH
+
ineffective adjust L105/L205.
2
aa
w -2
1
a
u
a
es
#
1
-6
or
ute
a
P
N-,
:
il
.
a
[htt
SO
63
100 125
250
400 500
1K
ak
SK
63x
10K
125K
FREQUENCY
IN Hz
Fig. 42 Overall Frequency Response Limits (for BIAS/EQ 1)
en
OP
a
A
SS
SR
A
EP
A
POF
AO
TI,
18
' NOTE:
For actual adjustment/test point locations, see page 21.
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