Component Engineering STRD-30S Manual Download Page 8 | Manualshive

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Component Engineering STRD-30S Manual Download Page 8

7

Screen snapshot of DRAS 10 software reading a loop of Dolby Digital test film

(note the recurring splice Error History).

Digital:

Connect your ’scope to Dolby’s digital processor (DA-10, DA-20, or CP500) according to their instructions, and start
running some digital film. The following are optional but highly recommended: A 486 class or better computer having a
high-speed (115kbs.) serial port and DRAS-10 software from Dolby. A nine conductor male to female cable with standard
9 pin “D” connectors that are wired pin to pin. It is possible to perform a good alignment using test film and an
oscilloscope, or it is possible to use test film and a computer running Dolby's DRAS-10 software.

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Summary of Contents for STRD-30S

Page 1: ...Copyright Component Engineering All Rights Reserved STRD 30S Digital Analog Sound Reader for Simplex Projectors ...

Page 2: ...it lens with its mounting bracket and the entire photocell assembly The sound drum rotary stabilizer and its ball bearings must also be removed temporarily NOTE The analog and digital sound pre amps and their optics are shipped already installed in the dual lens mount This assembly has been pre aligned in a standard Simplex 5 Star sound head You are strongly urged to leave it as a unit so that whe...

Page 3: ...g so you may have to proceed slowly The four mounting holes in the adapter block will now be over the tapped holes originally used to mount the slit lens holder in the casting Install the four 8 32 X 1 2 screws but do not tighten The reason for all this loose mounting is so that we can get all of the optical pieces properly aligned exactly on radius with reference to the center line of the sound d...

Page 4: ... already plugged onto the digital pre amp circuit board before you mount this assembly Wiring Connect both of the LED s to the outputs of the LS 30 power supply chassis The small terminal strips at the rear of the LED assembly can be unplugged by pushing away from you Note that no polarity is indicated This is because the LED s may come with either polarity and you will have to determine the corre...

Page 5: ... All of the terminal strips on the analog pre amp can be unplugged at the pre amp The video output cable from the digital pre amp in the sound head to the Dolby DA 10 or DA 20 is harder to deal with because it is so stiff and heavy The cables are shipped with both ends terminated in their respective connectors The smaller connector the sound head end can be gotten through 3 4 conduit but care must...

Page 6: ...ill be close enough to get you started Loosen the clamp screw of both of the copper LED mounts until they can be moved easily but will stay where you put them when you let go It is easier to grab both of the mounts when doing the analog LED which is the inner one and so it is best to do it first Analog Adjust the analog LED by eye until it looks as though it is opposite the lower lens In the cinem...

Page 7: ...ld the adjustment The other reason for this large contact area is that there is very good heat transfer from the LED itself right on down to the base casting of the sound head This means extra long life for the LED Now is the time to do the rest of the analog focus and azimuth alignment procedures Before you do your final Dolby Tone level adjustment it is a good idea to run Dolby Cat No 566 scanni...

Page 8: ...t running some digital film The following are optional but highly recommended A 486 class or better computer having a high speed 115kbs serial port and DRAS 10 software from Dolby A nine conductor male to female cable with standard 9 pin D connectors that are wired pin to pin It is possible to perform a good alignment using test film and an oscilloscope or it is possible to use test film and a com...

Page 9: ...n The digital reader optics should be close enough for you to find a scope picture similar to this illustration The first thing is to adjust the digital LED You want the brightest and most even light you can get This will be indicated on the scope screen by the flattest trace with the greatest amplitude Now that you have adjusted the analog LED you know the routine except that this time you will b...

Page 10: ...to walk the board in the reader We are ready to adjust the focus and azimuth of the digital optics Because the optics have been preset there is always the chance that focus may be OK Adjusting focus and azimuth are similar for digital and analog The reader clamp is loosened and the reader is moved forward or back to adjust focus When using the scope a correct digital burst the Grass will be in goo...

Page 11: ...mized Final As a final check run Dolby Cat 69T and observe both digital and analog levels and the digital error rate Analog You can go back and double check the analog setup Start as you did before by checking lateral position It should not have changed but if it has it is OK to refine it If you did refine it make sure the Dolby Tone equalization scanning beam illumination and lateral guide are st...

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