Teac CX-350 - Recording Performance; Bias Trap Adjustment; Record Bias Setting; Record Level Setting

Deck settings:
5-3. RECOROING PERFORMANCE
INSTRUCTION
DOL8Y NR sw.-OUT
INPUT sw.—LINE
OUTPUT cont.—Spec. position (item 2)
RECORD cont.—Spec. position (item 8)
INPUT SIGNAL
ADJUST
(or CHECK)
TEAC test tapes:
CX-350/CX-35
MTT-506: For record test with Co (Cr0.)
MTT-561: For record test with NORMAL
METAL:
MEASURING
POINT
RESULT
For record tost with METAL
REMARKS
10. Bias trap
Record-pause mode
LINE IN
No signal
U106/U206
BIAS TRAP TP
Min. reading
11. Record bias
@) METAL/METAL tape
(3) NORMAL/MTT-501
LINE JN
400 Hz & 6.3 kHz
alternately/—42 dB
(6.15 mV)
R14/R24
OUTPUT
Nearly equa! level
at both freq.
Adjust in the
order of
-Q@>
12. Record level
BIAS/EO — METAL
METAL tape
Co (CrO>)/MTT-506 tape
NORMAL/MTT-501
LINE IN
400 Hz/—12 dB
(195 mv)
LINE IN
400 Hz/-12 dB
(195 mv)
OUTPUT
—8 dB (308 mV)
OUTPUT
—-8 dB +1.5dB
(259 mV ~ 367 mV)
13. Total harmonic
distortion
METAL/METAL tape
Co (CrO>)/MTT-506
NORMAL/MTT-501
LINE IN
400 Hz/—12 dB
(195 mV)
OUTPUT
2.0% or less distortion
14, Frequency
response
METAL/METAL tape
Co (CrO2)/MTT-506
NORMAL/MTT-501
LINE IN
Required signal /
—42 dB (6.15 mV)
If frequency response is w
OUTPUT
40 Hz +4,—4dB
63 Hz +4,—4dB
125 Hz +4,—-2dB
250 Hz +2,—-2dB
400 Hz OdB (Ref.)
6.3 kHz +2,—-2 dB
8kHz +3,—2.5dB
12.5 kHz +3,—-4 dB
8kHz +3,—-3dB
10 kHz +3,—4dB
rong, recheck steps 11 and 13.
Meat
Co (CrO3)
NORMAL
15. Signat-to-noise
ratio
METAL/METAL tape)
Co (CrO)/MTT-506
NORMAL/MTT-501...
LINE IN
1 kHz/—-9 dB
(275 mv)
v
No signal
OUTPUT
} ...45 dB min. ratio
...44dB min. ratio
Ratio of spec.
output —5 dB
to noise
16. Erase efficiency
@ Connection — Fig. 5-1. But switch ON 1 kHz filter.
@
Record
1
kHz.
Rewind
tape
to
mid
point
of
recorded
portion.
Do
“‘no
signal
recording. Get difference between 1 kHz portion and its erased portion.
METAL/METAL tape
LINE IN
1 kHz/+1 dB
oa
no signal
OUTPUT
65dB min. ratio
Ref. output
level:
+5 dB
(1.38V)
17. REC MUTE
function
© Connection — Fig. 5-1. But switch ON 1 kHz filter.
@ Record 1 kHz. Then push REC MUTE button for several sec. Rewind end
play tape. Get difference between 1 kHz portion and the “no signal” portion.
Co (CrO2)/MTT-506
LINE IN
1 kHz/+1 dB
bane
no signal
OUTPUT
65 dB min. ratio
Ref. output
level:
+5 dB
(1.38V)
1S. Channel soparation
@
Connection
—
Fig.
5-1.
But
do
not
connect
LINE
JN
(R),
switch
ON
1
kHz
filter.
@
Set
deck
in
record
mode.
Find
differences
between
1
kHz
recorded
portion
(L-ch)
and “‘no signal"
Portion (R-ch).
Co (CrO2)/MTT-506
LINE IN
Lh 1 kHz/—9 dB
(275 mv)
R-ch No signal
OUTPUT
30 dB min, ratio