Playback Performance - Teac V-66C Service Manual

V-66C
TEAC test tapes:
ee MTT-150: For Dolby level calibration
Deck settings: MTT-356: For playback frequency response
TAPE SELECTOR sw: METAL ' check for METAL, Co (CrO, }
5-1
PLAYBACK PERFORMANCE
DOLBY NRIN/OUTsw:
OUT = MTT-501:
For S/N check with NORMAL
ADJUST MEASURING
ITEM
SETTING
INPUT SIGNAL
(or CHECK)
POINT: RESULT
REMARKS
OUTPUT: Refer to
MTT-150 Check Phase: within 45°
1. REC/PLAY
head Aca
hte giao
ee ieee Nae Sie eR ae pe
pine ee ee
aL Oe en ee ad
azimuth
Connection: Fig. 5-3
Azimuth screw| OUTPUT:
MTT-356 (12.5 kHz). | of R/P heads Max, output at L- &
(Fig. 5-4) R-ch's (on VTVM)
TP1/TP2
pizin22 387.5 mV (-6 dB)
2. Specified output
:
~-- ---
--- - - - - --e
----
level
ree
MENT
OUTPUT:
gare cadres
Check -3.5 dB +1 dB peas
(461 to 581 mV)
é PEAK LEVEL
3, PEAK LEVEL
oe
MTT-150 R14/R24
DISPLAY
DISPLAY
L
OdB
OUTPUT: iF
MTT-356 Adjust to obtain
(315 Hz & 10 kHz) R11/R21 equal output at
——
315 Hz and 10 kHz.
MTT-356 Check Cee |
4, Frequency
[| oo
ULL ae
tte we ket he ee De Be a tee ER So
cen Bl St
response OUTPUT:
At 10 kHz should
' MTT-356 be approx. 4 dB
TAPE sw: NORMAL
(10 kHz)
Check
higher than meas-
ured in METAL
position.
F '
Fully-erased MTT-501
f
Ratio of spec.
. fe a a
TAPE sw: NORMAL
tape (Use bulk tape
Check is
output of
aus
: —3.5 dB to noise)
Oscilloscope
DECK
under TEST
R
OUTPUT AC Voltmeter
Fig. 5-3 Test setup for azimuth check
O° (1N PHASE) 45° 90°
Fig. 5-5 Confirming phase relationship
eraser)
azimuth adjusting screw
(dB)
180°
REC/PLAY head
fixed
Fig. 5-4 Azimuth screw location
METAL
MTT-356
TAPE SELECTOR:
tape:
+2
L 1
40 «663
Fig. 5-6 Playback frequency response
1 L 4
125 315 10k (Hz)