Tascam DA-30 - Page 31

¢ 2)
3)
4)
Adjustment of the A/D OFFSET
Connect
CH-1
of
the
oscilloscope
to
TP-3
(ADDT)
and
CH-2
to
TP-1
(LRCK).
Short the LINE IN terminals of the set.
Set the UNBAL-BAL switch to the UNBAL position,
then set all controls on the front panel to the mini-
mum position.
Load the blank tape TY-30B or equivalent, then set
the
unit
to
the
REC/PAUSE
mode.
At
this
time,
adjust semi-fixed resistors R120 (L-channel) and R220
(R-channel) for adjusting A/D OFFSET so that the
waveform
at
TP-3
(ADDT)
is
as
shown
in
Photo
4-6
(Fig. 4-11 @).
Note: Since offset will deviate with a single adjust-
ment, stop the unit, then set it to the REC/
PAUSE mode and repeat adjustment two: or
three times. ;
®
CH-1{ADDT) | HTT] THT
CH-2(LRCK)
|
|
|
@®
PRERLG RAR GO PEN SARTRE
TERRE EEE ER EE SRI EEE
CH-1(ADOT) LH] HTT]
CH-2(LRCK)
|
|
|
1. A“D OFFSET#E
1). t¥axRI-—SOCH-1ETP-3(ADDT) ic, CH-2=TP-1(L
RCK) KENVHIELT S.
2). ty RO LINE INFEY a - FSS,
3). UNBAL-BAL 24 yF EUNBAL (Cty tL, Zarb.
MANMEDS TONY s-ALH Pte TS.
4). TY-30BH OFS 47> F-SERBAL, REC/PAUSE
KGtCLEKERO TP-3(ADDT) OMA. Bea-6 (
Bl4-11@) DRT SLK DU A/D OFFSET WMH OE
EMM Ri20(L-CH) , R220(R-Ch) METS.
Photo 4-6
In the photo, only the lower 2 bits are high.
HE. —BOMMTIL OFFSET UFNHSZOTC, STOPL
THU REC/PAUSEIRHEIA LOMB TS SZEWS ILS
2~3ERBORLTFAU,
®
CH~2(LRCK)
| |
|
CH-1 (ADOT) | | | | |
CH-2(LRCK) oe cee
Fig. 4-11
31
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