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_V-2RX/V-GRX |
PRECAUTIONS
:
1. Before performing adjustments and checks, clean and demag-
netize the entire tape path.
2. Make sure the deck is properly set for the voltage in your local-
ity.
3. In general, adjustments and checks are made in the order of
L-ch then R-ch. Double REF. Nos. and test point designations
indicate L-ch/R-ch. (Example: R11/R21)
Oscillator
Distortion Analyzer
Attenuator
. 0 dB is referenced to 0.775 V. If an AC voltmeter thi references
0 dB to 1 V is used, appropriate compensation should be made.
. The AC voltmeter used in the procedures must hav@ an input
impedance of 1Mo or more.
. Note the "deck settings" at the top of each chart. The settings
apply to all checks for a specific chart unless explicitly stated
otherwise.
Oscilloscope
AC Voltmeter
1kHz
Filter
LINE
IN
OUTPUT
Fig. 5-1
Basic test setup
Deck settings:
LEVEL cont.:
OFF (depressed)
.
MONITOR sw
TEAC test tapes:
{V-2RX only): TAPE
MTT-150:
For Dolby level calibration
NR SYSTEM sw:
OUT
MTT-356:
'For playback Lh
barten 4 response
TAPE sw:
METAL
check for METAL, Co (CrO2)
5-1
PLAYBACK PERFORMANCE
OUTPUT cont.:
MAX
MTT-501:
For S/N check with NORMAL
ADJUST
MEASURING
ITEM
SETTING
INPUT SIGNAL
(or CHECK)
POINT:
RESULT
REMARKS
:
OUTPUT:
Refer to Fig.
. REC-PLAY
MEDIC
eneee
Phase:
within 45°
5-5.
head
Connection:
Fig. 5-2
Azimuth screw | OUTPUT:
azimuth
MTT-356 (12.5 kHz)
of R-P head
(Figs. 5-3, 5-4)
Max. output at L-&
R-ch's (on VTVM)
. Specified
output
——
level
MTT-150
OUTPUT:
Spec. output
. PEAK PRO-
PEAK PROGRAM
GRAM LEVEL
—
MTT-150
R15/R25
LEVEL METER:
METER
0dB
TAPE sw:
METAL
If 10 kHz output is lower
then spec, connect C107
MTT-356
Check
OUTPUT: Fig. 5-6
(C202) in parallel with C101
(C201) on REC/PLAY AMPL
. Frequency
PCB.
response
TAPE sw:
NORMAL
MTT-356
OUTPUT:
At 10 kHz
should be approx.
Check
4 dB higher than
measured in above
step.
F
i
Fully-erased
Ratio of spec.
. Signal-to-noise
:
.
OUTPUT:
ratio
TAPE sw:
NORMAL
MTT-501 tape:
Check
47 dB min.
outp ut of
(Use bulk tape eraser)
-3.5 dB to noise
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