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C-3RX
Deck settings:
TEAC test tapes:
MONITOR sw.:
TAPE
MTT-150:
For Dolby level calibration
NR SYSTEM sw.: OUT
MTT-316:
For playback frequency response
EQ sw.:
METAL
check for METAL, Co(Cr0,)
5-2 PLAYBACK PREFORMANCE
;
MTT-216:
For playback response check for NORMAL
MEASURING
ADJUST
POINT:
ITEM
SETTING
INPUT SIGNAL
(or CHECK)
RESULT
OUTPUT:
Phase: about 0°
on 'scope (Fig. 5-4)
® Max. output on
VTVM
OUTPUT:
Phase:
45° min.
(315 Hz)
90°
min.
(12.5 kHz)
Conn.:
Fig. 5-2
Azimuth nut of
R-P heads
{Fig. 5-3)
1. REC/PLAY
head
azimuth
OUTPUT cont.:
convenient
output level position
pan
neon
"
MTT-150
MTT-316 (12.5 kHz) ;
TP1/TP2:
—2.5 dB (581 mV)
®@ Spec. setting of
OUTPUT cont.
@ Spec. output
level
OUTPUT:
—5 dB (436 mV)
3. Specified output
level
EQ:
METAL, Co(CrO,)
Adjust for 10 kHz signal at
same level as ref. signal
(315 Hz)
5. Frequency response
| - - - ~~ --- ---~-~-4------------}-~-----—--|--
---------
OUTPUT: At 10 kHz,
should be 3 dB to 6dB
higher than measured
in above step.
OUTPUT:
R10/R20
Fig 55
EQ:
NORMAL
MTT-316
Fully-erased tape:
OUTPUT:
:
{Use bulk tape eraser)
}
:
Ratio of spec.
6. Signal-to-noise ratio
}EQ: METAL
..... etree ys
. METAL
......
52 dB min.
output of
Co{CrO.)
.. 2.2.2...
. MTT-5061.....
—5 dB to noise
NORMAL
.........
. MTT-501
.....
..48dB min.
EQ:
NORMAL
Tape:
MTT-216
EQ: METAL, Co{CrO2)
(
Tape:
MTT-316
+ N
0° (IN PHASE)
45°
90°
180°
RESPONSE
IN dB
n
FREQUENCY IN Hz
Fig. 5-4 Confirming phase relationship
Fig. 5-5 Playback frequency response
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