Teac CX-270 - Adjustment and Test Point Locations

6. Signal to noise
ratio
Fig. 5-3
Test tone, 1kHz/
—9 dB (275 mv)
then
No signal recording
Check
aa
45 dB (min.) ratio. . .
44 dB (min.) ratio. . .
e Ratio of 1kHz portion
and no signal portion
... Co (CrO2)
(X-270/€X-210 |
. Erase efficiency
Fig. 5-3, switch on
1kHz filter
Test tone, 1kHz/
+1 dB (0.869 V)
then
No signal recording
65 dB (min.) ratio
® Co (CrO2) only
®@ Record 1kHz. Rewind tape
to mid point of recorded
portion. Do no signal re-
cording. Get difference be-
tween 1kHz portion and
its erased portion.
. Channel
separation
Fig. 5-3, connect
OSC>ATT to LINE
IN (L) only, switch
on 1kHz filter
Test tone, 1kHz/
—9 dB (275 mv)
for L-ch and
Check
;
30 dB (min.) ratio
® Co (CrO2) only
© Set deck in record mode.
Find differences between
1kHz recorded portion
(L-ch) and no signal
portion (R-ch).
. Adjacent track
cross talk
Fig. 5-3, connect
OSC>ATT to LINE
IN (R) only, and
AC voltmeter to
OUTPUT (R) only
No signal for |
Test tone, 125Hz
—9 dB (275 mV)
40 dB (min.) ratio
® Co (CrO.) only
® Record 125Hz on R-ch.
Note output level of its
recorded portion. Invert
tape and play R-ch track.
Check leakage tevel against
the output ref. of previ-
ously recorded portion.
10.Doiby NR
effect
T TT
Test tone: 1kHz/
—32 dB (19.5 mV),
10kHz/—42 dB
(6.15 mV)
5-7
ADJUSTMENT
AND
TEST
POINT
LOCATIONS
=
~ am
Ps
7
q
ee 2%
|
Variation from ref.
At 1kHz:
3 dB to8dB
At 10kHz:
8 dB to 12 dB
TA-1021
® Co (CrO,) only
@ Record 1kHz w/DOLBY
NR sw. to OUT. Play its
portion w/DOLBY NR,
OUT and IN. Get the out-
put level difference be-
tween OUT and IN.
© Repeat the above process
for 10kHz.