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V-66C
TEAC test tapes:
5-1
PLAYBACK PERFORMANCE
Deck settings:
TAPE SELECTOR sw:
METAL
DOLBY NR IN/OUT sw:
OUT
MTT-150:
For Dolby level calibration
MTT-356:
For playback frequency response
check for METAL, Co (Cr02)
MTT-501:
For S/N check with NORMAL
ITEM
SETTING
INPUT SIGNAL
ADJUST
(or CHECK)
MEASURING
POINT: RESULT
REMARKS
1. REC/PLAY head
azimuth
Connection: Fig. 5-3
MTT-150
MTT-356 (12.5 kHz)
Check
Azimuth screw
of R/P heads
(Fig. 54)
OUTPUT:
Phase: within 45°
OUTPUT:
Max. output at L- &
R-ch's (on VTVM)
Refer to
Fig. 5-5
2. Specified output
level
MTT-150
R12/R22
Check
TP 1 /TP 2
387.5 mV (-6 dB)
OUTPUT:
-3.5 dB ±1 dB
(461 to 581 mV)
Spec, output
level
3. PEAK LEVEL
DISPLAY
MTT-150
R14/R24
PEAK LEVEL
DISPLAY
0 dB
4. Frequency
response
TAPE sw: NORMAL
MTT-356
(315 Hz & 10 kHz)
MTT-356
MTT-356
(10 kHz)
R11/R21
Check
Check
OUTPUT:
Adjust to obtain
equal output at
315 Hz and 10 kHz.
OUTPUT:
Fig. 5-6
OUTPUT:
At 10 kHz should
be approx. 4 dB
higher than meas¬
ured in METAL
position.
5. Signal-to-noise
ratio
TAPE sw: NORMAL
Fully-erased MTT-501
tape (Use bulk tape
eraser)
Check
OUTPUT:
46 dB min.
Ratio of spec,
output of
-3.5 dB to noise)
Oscilloscope
OUTPUT
AC Voltmeter
Fig. 5-3
Test setup for azimuth check
Fig. 5-5
Confirming phase relationship
REC/PLAY head
(dB)
+ 4 |
+ 2
!
0 i
"2
-4 I
-6 I
Fig. 5-4
Azimuth screw location
TAPE SELECTOR:
METAL
tape:
MTT-356
40
63
125
315
Fig. 5-6
Playback frequency response
9
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