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C-3RX
C-3RX
Deck settings:
5-5 ADJUSTMENT AND TEST POINT LOCATIONS (1)
MONITOR sw.:
TAPE .
OUTPUT cont.:
Specified position (item 3)
MTT-501:
For record test with NORMAL
NOTE:
MTT-5072:
For record test with METAL
Test this performance only after you are sure that the. "5-6 DBX PCB ADJUSTMENT"
is correct.
:
5-4 DBX PERFORMANCE
ITEM
SETTING
. Encoder fevel
setting
. Encoder operation
check (level)
. Encoder operation
check (frequency)
. Encoder operation
check (S/N ratio)
. Decoder level
setting
. Channel
separation
. Distortion
. Signal-to-noise
ratio
RECORD-
PLAY mode
BIAS, EQ:
Co(CrO,)
+
Tape:
NR SYSTEM:
MTT-5061
OUT
NR SYSTEM:
INPUT SIGNAL
LINE IN:
1 kHz/—9 dB
(275 mV)
LINE IN:
1 kH2/—14.5 dB
(146 mV)
LINE IN:
1 kHz/—74.5 dB
(146 pV)
LINE IN:
1 kH2/+5.5 dB
(1.46V)
LINE IN:
100 Hz/—14.5 dB
(146 mV)
LINE IN:
10 kH2z/—14.5 dB
LINE IN:
No signal
LINE IN:
1 kHz/—14,5 dB
(146 mV)
LINE IN:
1 kHz/—14.5 dB
ADJUST
(or CHECK)
RECORD cont.
R76/R86
R73/R83
MEASURING
POINT:
RESULT
A/C term. on dbx PCB:
—2.5 dB (580 mV)
TP1/TP3 on dbx PCB:
—8 dB (308 mV)
(Ref.1)
TP1/TP3 on dbx PCB:
—30 dB +0.5dB
variation from Ref. 1
TP1/TP3 on dbx PCB:
+10 dB +0.5 dB
variation from Ref. 1
TP1/TP3 on dbx PCB:
+0.5 dB +1 dB
deviation from Ref. 1
TP1/TP3 on dbx PCB:
—2.8 dB +1 dB
deviation from Ref. 1
TP1/TP3 on dbx PCB:
_ Noise level: —40 dB
or less
OUTPUT:
:
—10.5 dB (231 mV)
(Ref.2)
OUTPUT:
+0.5 dB from Ref, 2
© Connection: Fig. 5-1, but do not connect LINE IN (R), and engage 1-kHz filter.
e Set the deck to record mode. Find the difference between the 1-kHz recorded
portion (L-ch) and the 'no signal'' portion (R-ch).
NR SYSTEM sw.: dbx
BIAS, EQ: Co(CrO,)
Tape: MTT-5061
RECORD-PLAY mode
BIAS, EQ: METAL
Tape: MTT-5072
BIAS, EQ: Co(CrO,)
Tape: MTT-5061
BIAS, EQ: NORMAL
Tape: MTT-501
Same as above
LINE IN:
L-ch: 1 kHz/—9 dB
(275 mV)
R-ch: No signal
LINE IN:
400 Hz/—12 dB
(195 mV)
LINE IN:
1 kHz/—9 dB
(275 mV)
No signal
OUTPUT:
50 dB min. ratio
OUTPUT:
1.5% or less
(using 3 different
types of test tapes)
OUTPUT:
65 dB min. ratio
(using 3 different
types of test tapes)
IMPORTANT:
Do not change
the setting of
the RECORD or
OUTPUT
cont-
|
rols after estab-
lishing this step.
Ratio of 1 kHz
output (—5 dB)
to noise
R10/R20
R11/R21
R12/R22
R13/R23
R14/R24
R15/R25
R16/R26
R17/R27
R18/R28
R30/R40
R35/R45
L104/L204
Playback EQ
Playback level
PEAK LEVEL meter
Record bias (NORMAL)
Record bias [Co(Cr0,)]
Record bias (METAL)
Record level (METAL)
Record level [Co(Cr0,)]
Record level (NORMAL)
Record level {coarse-adjusted
for general setting)
Record bias (coarse-adjusted
for general setting)
Bias trap
14
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