DSTR-20
INSTRUCTION
MANUAL
Digital Penthouse Reader
181 Bonetti Dr
San Luis Obispo, CA
93401 USA
ph: 805-549-0161
fax: 805-549-0163
e-mail:usl@uslinc.com
1025 Pine Meadows Ct
Martinez, CA
94553 USA
ph: 925-372-7603
fax: 925-372-7658
e-mail: bacp2000@aol.com
DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
One Year Limited Warranty
USL, Inc. warrants that each product manufactured by it will be
free from defects in material and workmanship under normal usage
for a period of one (1) year after its purchase new from an authorized
dealer. Our obligation under this warranty is limited to repairing
or replacing any product or component which we are satisfied does
not conform with the foregoing warranty and which is returned to
our factory, freight paid, or serviced by one of our authorized
contractors. The forgoing warranty is exclusive and in lieu of all
other warranties, whether expressed or implied. Such warranty
shall not apply to any product or component (A) repaired or altered
by anyone other than USL, Inc. or an authorized service contractor;
(B) tampered with or altered in any way or subjected to misuse,
negligence or accident or (C) which has been improperly connected
installed or adjusted other than in accordance with USL, Inc.’s
instruction.
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
Table of Contents
Topic
Page
Installation Overview............................................3
Mechanical Installation........................................3
Delay Setting..................................................... .5
Installing the Video Cable and Flywheel................5
Reader Alignment................................................7
LED Adjustment..................................................8
Focus, Azimuth and CCD lateral adjustment..........8
Fig. 1: Reader, Back View.............4
Fig. 2: Reader, Front View.............6
Fig. 3: SR.D Video Display............7
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
Introduction and Installation Overview
The DSTR-20 is a lower cost penthouse-style SR.D soundtrack reader with a number
of new features. These include circuitry to enhance bit readability and a video status
light that signals adequate video level. A new, more efficient imaging lens design
allows the use of an internal LED current supply that derives it's power from the +/15 Volt rails of the Dolby Digital processor. Thus, there is no need for external
AC power. A user-replaceable LED module rounds out the feature list.
The DSTR-20 will attach directly to the Christie, Cinemeccanica, Century, Ballantyne,
and Simplex projectors using one of the bolt pattern sets provided on the bottom of
the reader case.
Adaptor plates are available for the following projectors
Norelco AA-11/DP70
Dolby Cat. No. 695
Kinoton DP75/FP20, FP30
Dolby Cat. No. 696
A number of standard bolt pattern sets are also provided to accommodate film
magazines, reel arms or film guidance hardware. Cinemeccanica projectors do
require an adaptor plate (Dolby Cat. No. 690) to attach its standard upper reel arm
to the DSTR-20.
Mechanical Installation
NOTE: While every effort has been made to assure the robustness and reliability
of the DSTR-20, it must be understood that it is primarily a precision opto-mechanical
device built to exacting tolerances and must never be handled without due concern.
Unpack reader and locate its packing kit, flywheel, and video cable. The reader is
shipped with a 30 Ft. (10 meter) cable. Longer video cables are available on request.
Remove the back cover
Attach reader to top of projector using the bolts provided. Since projectors tend to
have custom features, some improvisation may be required to accommodate the
douser, film cleaner brackets, etc.
Attach the reel arm/film guidance hardware to the top of the reader. Verify that
bolts clear the reader's internal components before tightening. Thread film though
film guidance hardware, reader, and upper part of the projector. Adjust the reader
and reel arm so film runs straight and true without rubbing or binding. Tighten
attaching bolts. Install flywheel as shown in Figure 1 by slipping on to shaft and
aligning the set screw with the notch on the drum shaft. The setscrew should tighten
into the notch,
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
FIGURE 1
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
Reader Delay Setting
This reader uses the same delay setting as the Dolby Cat 701 Reader +/- a
perforation. There are a number of methods to set the delay: a dedicated sync loop,
the SR.D Jiffy test film and setup menu in the CP500 and CP650.
Installing the Video Cable and Flywheel
Note: Turn off Dolby processor power before attaching
cable to reader or cinema processor. Do not hot-plug
this cable as you may destroy the reader CCD card,
Dolby video board, or both.
Run the video cable through the hole provided in the back of the reader and plug
it into the CCD board connector. A separate ground lug is provided to bond the
cable to the reader chassis. Tighten wire clamp around the cable. Plug the other
end of cable into the Dolby processor.
Please confirm the cable is plugged into reader
connector, pin for pin. Misaligned pins will cause
damage to sensor board or Dolby Processor.
Remove the protective boot from sound drum shaft and attach flywheel taking care
to line up the set screw with the slot in the Sound Drum Shaft. Be careful not to
lose the thrust spring.
Replace the back cover. Restore AC power to Dolby
processor.
Thread and run a film loop or reel with a Dolby Digital soundtrack. Check the
error rate displayed on the Dolby Digital processor. Today's feature films and
previews typically run at error rates 3 and below. The video status light should go
green with film is running. This indicates an adequate video level (2 Volts or more)
for correct operation. The light will turn red for a number of reasons including low
LED output or a dirty lens.
The alignment of the reader is set at the factory and should not require further
adjustment.
Reader video alignment can be checked if necessary using the instruction below.
Installation is now complete
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USL/B.A.C.P.
VIDEO
STATUS
MANUFACTURED BY
DIGITAL SOUNDTRACK READER
DSTR-20
DSTR-20 INSTRUCTION MANUAL
LED current trim pot
FIGURE 2
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
Reader Alignment
SR.D VIDEO DISPLAY
FIGURE 3
The reader is shipped pre-aligned for 4.5 volts Video output. The following procedure
requires a wide bandwidth oscilloscope (20 MHz or better) and may be used to
verify correct initial operation and also to troubleshoot the unit should service be
required in the future. Focus and video output level may be easily adjusted using
only this instrument. A laptop with Dolby DRAS software may also be used to
measure and display data about the reader and the film being run.
Connect the oscilloscope to Dolby Digital processor as follows: connect scope
channel 1 probe to Video test point and its ground test probe to the ground test point.
Connect scope channel 2 to the Clamp test point.
Set scope channels 1 and 2 to 1 Volt sensitivity, DC coupling, calibrated.
Set horizontal sweep rate to 2 us/division.
Run Cat. No. 69T film loop to generate a video signal.
Adjust scope trigger level to stabilize on the clamp signal.
Adjust horizontal position to inside edge of left clamp signal with the scope's left
screen graticule.
Adjust horizontal sweep vernier to line up inside edge of the right screen clamp
signal with right screen graticule as shown in Fig. 3.
Adjust the scope channel 1 vertical position so the bottom of the video display is
even with the lowest horizontal graticule. The video output level should be
comfortably above 2 Volts for proper operation.
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
LED Mechanical Adjustment
Verify correct LED position by loosening the two LED/heat sink screws and rotate
for maximum video output. Tighten screws.
LED Current Adjustment
As time passes, the LED output will diminish. Our initial LED current setting of about
140 mA should ensure years of service before the video output level drops below the
established minimum of 1.5 Volts video output. The video status light will turn from
green to red indicating it is time for a service call.
LED current can be adjusted by means of a trim pot located beneath the CCD/Lens
cover. Remove the cover and adjust the trim pot to yield 4.5 Volts video output on the
scope.
Focus, Azimuth and CCD lateral adjustment
Azimuth is adjusted by rotating the sensor PC board. When properly adjustd, the
DRAS software display should indicate an azimuth of ø degrees.
Focus is adjusted by loosening the lens clamp screw and turning the knurled lens nut
to adjust the lens in and out for best video resolution on the scope or DRAS.
CCD horizontal position is adjusted by loosening the PC board screws and sliding the
CCD board in and out until the DRAS perforation display is centered.
Note: In all casses, an oscilloscope is required for viewing the video output signal
during CCD focus, alignment and initial Red LED current adjustment. Re-adjust the
Red LED current if the Status Light LED displays red during an SRD film.
Sensor Board Status Light Circuit
After focus and alignment of the Sensor Board, running an SRD film, increase the
Red LED current until the Status Light displays yellow, and then back the current
down until the Status Light LED displays green. This is the maximum video voltage
of the normal video range.
LED color
(Status Light)
Video
Description
Video Range
Red
Low
0.0 -1.5V
Green
Normal
1.5 - 4.5V
Yellow
High
>4.5V
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DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
Molex 12 Pin Connector
Top
Pin 1
Front
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DSTR-20 INSTRUCTION MANUAL
Molex
Pin no.
1
2
3
Wire
color
Black
Shield
USL/B.A.C.P.
Cable Pair
sheild color
Red
Red
Blue
GND
Video 1
-15 V
GND
+15 V
TTC
FTC
4
Black
Green
5
Shield
Blue
Blue
6
7
8
Red
Blue
Red
Blue
Black
9
10
Shield
White
Shield
Blue
Blue
11
12
Black
Signal
name
Video 0
Green
Green
Green
NOTES
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TC GND
TSC
SC GND
FSC
DSTR-20 INSTRUCTION MANUAL
USL/B.A.C.P.
1025 Pine Meadows Ct
Martinez, CA
94553 USA
ph: 925-372-7603
fax: 925-372-7658
e-mail: bacp2000@aol.com
181 Bonetti Dr
San Luis Obispo, CA
93401 USA
ph: 805-549-0161
fax: 805-549-0163
e-mail:usl@uslinc.com
1/17/02