Teac C-3RX - Playback Performance Verification

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