Teac X-1000 - 3-4 DBX Performance Checks; 3-5 DBX PCB Adjustment

X%1000M/X1000
: NOTE:
3-4
DBX
PERFORMANCE
Test
this
performance
only
after
you
are
sure
that
the
“’3-5
DBX
PCB
ADJUSTMENT
is
correct.
MODE/ SIGNAL ADJUST
CONNECTION INSTRUCTION SOURCE _ | (or CHECK)
RESULT ‘REMARKS
. 27, Encoder OSC — ATT to DBX sw—OUT 1kHz/—12dB —8dB (308mvV)
level LINE IN (both MON!ITOR— (195mvV)
L- & R-ch’s) SOURCE
OUTPUT cont.—CAL
AC voltmeter to LINE cont.—Spec.
REC AND PLAY | position (item 1-2)
AMPL. PCB term. | MIC cont.—MIN
#46 :
Same as above, i R737/R738 | —8dB +0.5dB
but (291mV ~
DBX sw—IN 327mV)}
Repeat 27-1 ~ 27-2 by changing to REC AND PLAY AMPL. PCB term. #47.
IMPORTANT: Do not disturb all MIC, LINE and OUTPUT controls during later checks.
28. Decorder Tape—YTT-8013 1kHz/—12dB Note the measur-
level DBX sw—OUT (195mV) ed output as
SPEED—19cm/s reference.
REC MODE—-ON
TAPE sw—LH-I
MONITOR—TAPE
Same as above R637/R638 | +0.5dB deviation
but from ref.
DBX sw—iN
29. Frequency Same as 22-1 ~ Required signal, 38cm/s, 19cm/s:
response 22-6, but —32dB 40Hz ~ 20kHz
- | DBX sw—IN (19.5mV) +5, —4dB
EE al (Ref.: 400Hz)
YTT-8053f OT'V 9.5cm/s:
40Hz ~ 16kHz
+5, —4dB
(Ref,: 400Hz)
| 30. Signal to DBX sw—IN 1kHz/—12dB 65dB min. ratio | Ratio of spec. —5dB to
noise ratio REC MODE sw—ON_ | (195mV) (w/LH-, EE at | noise
MONITOR—TAPE then all tape speeds)
LH-I No signal
YTT-8013 recording
EE
YTT-8053
31. Distortion Same as 30-1 1kHz/—12dB 0.8%-or less OVU input level
: but {195mvV) (w/LH-I, EE)
SPEED—38cm/s
[X-1000M] or
19cm/s [X-1000]
1kHz/+8dB 3% or fess 20V U input level
(1.95V) (w/LH-II, EE)
3-5 DBX PCB ADJUSTMENT
NOTES:
1. This section adjustment is not usually needed unless a trimmer(s)
AVS AUTAPSIUBLUN,
has been changed or a component(s) on the DBX PCB has sus- HAH
tained damage, since the PCB has been precisely adjusted in the a Hl im |
factory.
2. Disconnect all connectors on the DBX PCB, except for J501/ Fig. 3-9 RMS symmetry adjustment (incorrect)
P501. Turn the deck OFF to prevent accidental damage when
disconnecting or reconnecting.
Fig. 3-10 RMS symmetry adjustment (correct)
14