Tascam DA-30 - Page 19

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Load the tape travel adjustment tape (TY-7251 manu-
factured by SONY), then let it run in the PLAY mode.
From the position where the heads of the P1 and P2
posts are coarse-adjusted using the hexagonal wrench
described in 3-1 (back tension torque adjustment),
rotate these by one turn clockwise to disengage lower
adjustment.
Connect CH1 of the oscilloscope to TP412 (ENV) on
the digital PCB and CH2 to TP407 (SWH) (Fig. 4-1),
then adjust the height of the guide roller while observ-
ing the envelope of the RF signal.
Adjustment methods
{. Turn the screw on top of the supply-side guide
roller clockwise using the wrench and adjust so
that the envelope of the supply side has a parallel
section (Fig. 3-7).
Fig. 3-7
tl. Try turning the screw on top of the take-up side
guide roller clockwise and counterclockwise
to eliminate narrowing of the.envelope (Fig. 3-8).
Fig. 3-8
Hil. Gently turn both guide rollers alternately clock-
wise so that the envelope has the shape shown in
Fig. 3-9. At this time, the lower edge of the tape
should be fully on the drum lead.
Fig. 3-9
. EAS — 7 (Sony H Ty-1251) GS
L. PLAY
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