Dbx Adjustment Connection -30; Vca Symmetry Adjustment Waveform - Teac TASCAM 388 STUDIO 8 Operation & Maintenance Manual

1-6-2 DBX Adjustment Connection
Low dttrorrion
flF OSCILLATOR
ATTENUATOR
Oistortion factor 0.02% or lett
OuTpul level 3V or more
oex PCB
F6-I
FUNCTION GENERATOR
FUNCTION
CONTINue
®-
INPUT output
Apply L sigoal for
DBX NR IM mode. j
Apply L signal for
Decode or H signal I
for Encodemodc. ^ !—o Jin-2
J2H-1
J411-1
w
*0 J110-1
J110-2
J"2-2€
JII2-3C
JII2-4C
piia6 O-
pno-6 o-
♦ I2V
GND
OSCILLOSCOPE
AC VOLTMETER
\H /^OOT
° O "
Fig. 1-6-2 RMS Symmetry Adj. & Level Adj.
( RELEASE RATE CHECK )
LOW disrorlton
AF OSCILLATOR
OUIPUTO
Gmo'
ATTENUATOR
IOOO^lJ Í-P
Oisrorfion foctor 002 X or less
Output level 3V or more
DBX PCB
F6-I
FUNCTION GENERATOR
FUNCTION
ana
Apply L signal for I—
DBX NR IN mode. J
Apply L signal for I j-o ..
Decode or H signal I
for Encode mode. J'
J211-1
J411-1
IITDIIT
-O J110-1
-O J110-2
JII2-2
JII2-3
JM2-4
CMD
-12V
OSCILLOSCOPE
TP01 O-
GND o-
Fig. 1-6-3 Release Rate Check
I VCA SYM ADJUSTMENT )
Low distoriion
AF OSCILLATOR
ATTENUATOR
vw.
OO^lJ V
Apply Lsignal for
DBX NR IN mode.
F6 -1 Apply L signal for
FUNCTION GENERATOR Decode or H signal
for Encode mode.
INPUT
DBX PCB
J211-t
J111-2
Lavoi variation
5mV or Isss *
J110-I
J110-2
INPUT thorting
r/v\
o TP01
GNO
pno-6
P110-6 GNO GNO O
rOOGX NR
lOmtecU—«J
♦ iv
A A
-w-AA
Fig. 1-6-4 VCA Symmetry Adj.
1-6-3 VCA Symmetry Adjustment Waveform
: f
Fig. 1-6-5 RMS Symmetry Adjustment (Incorrect)
Fig. 1-6-6 RMS Symmetry Adjustment (Correct)
1 -30