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DIGITAL THEATER SYSTEMS, INC.
Digital Sound For Movies
DTS-6 /-6D System Testing
And
Troubleshooting
August 1999 Digital Theater Systems, Inc.
5171 Clareton Drive
DTS SA, UK Agoura Hills, CA 91301 USA
Telephone: 44 (0) 118 934 9199 Telephone (818) 706-3525
Fax: 44 (0) 118 934 9198 Fax (818) 706-1868
Email cinematech@dtsonline.com
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TABLE OF CONTENTS Page DTS System Test ………………………………………………………………..… 3 – 5 70mm Failsafe Test ……………………………………………………………….. 6 DTS Test Discs (history) ………………………………………………………….. 7 Empirical Test Disc (menu) ……………………………………………………….. 8 DTS System Troubleshooting Guide ……………………………………………… 9 – 16 DTS-6/6D Player Troubleshooting Guide ………………………………………… 17 – 18 Replacing TEAC CD-ROM Drives …………………………………………………...19 – 25 TEAC Jumper (address) Drawing ……………………………………………………………….21 DTS-6 (2-drive) Top View Drawing
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DTS-6/6D System Test Tools Required ** RTA (real time analyzer) and pink noise card. Necessary to adjust EQ in “B” chain. ** SPL meter Projector Speed Disc (special order from DTS) DTS Technician’s Kit: • • • • 6-Track SETUP Disc, Rev. DS1 Used to adjust DTS-6D levels, check automatic default switching, and verify operation of drives & player. • • • • “Buzz and Bill Show” Disc (dated Feb. 1, 1999) • • • • DTS Demo Film, 35mm Used with the DTS Demo Film to test the DTS system. Used with
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DTS SYSTEM TEST 6. Index Switch. A small black momentary push button switch located below the TIMECODE HEAD OFFSET switches (behind the plate and under the LEDs). It is commonly called the “index switch”. This button can be used to increment to the next track being played. This feature works on the DTS 6-TRACK SET UP discs RevC and Rev.DS1 only. On shows of serial number 1009 and higher, the momentary button also bypasses the DTS processor to allow checking of the optical bypass fun
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DTS SYSTEM TEST 13. Unblock the timecode. Once the cinema processor automatically returns to a digital format, go into the theater and listen to the sound track. Verify good sound quality and lip sync. Also verify no extraneous noise during the quiet scenes. 14. DTS-6D Programmed Default. Use the SET-UP DS1 disc to test all the default functions on the player. Load the SET-UP DS1 disc in the DTS-6D and stand next to the unit when performing this test. To start, allow the right channel’s
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DTS 70mm Fail-safe Test NOTE: If using one DTS-6D unit, there is no fail-safe or fall-back available on this type of system. If using two DTS-6D units, verify connections to the fail-safe board. See installation manual. There are no magnetic sound tracks on DTS 70mm prints. Tools Required DTS 70mm offset measurement film DTS 70mm formatted film and two sets of discs that match the film. DTS Setup Disc, DS1 Test Procedure 1. Use the DS1 Setup Disc to verify that both players have the same
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DTS TEST DISCS Below is a list of all the test discs released by DTS. Some of these test discs are obsolete and should no longer be used. In most cases, the discs are obsolete due to software changes that made them incompatible with current DTS players. Normally, when a test disc is obsolete, DTS will send free upgraded discs to people who have purchased DTS Technician’s Kits. Sometimes, we miss a few people. Anyone who was missed is still entitled to a free upgraded disc. They should co
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DTS EMPIRICAL TEST DISC Tests #1 through #35 will play automatically. For a specific test, wait for the announcement, then select the desired test number on the TIMECODE HEAD OFFSET rotary switches (located behind the player's front panel access cover). Be sure to write down the current offset setting before your selection is made and restore the setting for proper DTS movie playback. NOTE: *Some of these test signals may cause serious damage to sound systems that are not properly designe
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DTS SYSTEM TROUBLESHOOTING 1. Movie not playing in DTS digital sound, CP (cinema processor) won’t switch to DTS format. Is the SYSTEM light blinking on the DTS player? NO System is not ready to play. Ensure movie disc(s) are in the DTS player. They should match the movie playing. Turn off DTS player power switch, wait 3 seconds, switch back on. If SYSTEM light doesn’t blink, repeat test using another set of movie discs or use a DTS test disc. If the SYSTEM light doesn’t blink, try
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SYSTEM TROUBLESHOOTING 1. (continued). Movie not playing in DTS digital sound, CP (cinema processor) won’t switch to DTS format. * Is CP in the correct sound format? In most cases, DTS will automatically pulse the CP. If re-starting after film break, some automation systems may switch the CP out of the digital format. If this occurs, it will be necessary to reselect the digital format manually. Is the BS22 cable (DTS-6) or automation cable (DTS-6D) connected to CP logic? Verify PIN 1
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SYSTEM TROUBLESHOOTING 2. (continued) DTS digital movie defaulting to optical (analog) and not staying in digital. If the reader’s green LED is solid and the DTS still defaults, look at the lights on CD-ROM drives themselves. They should blink sporadically when their disc is being read. If the drive light is on solid, this means the drive cannot read the disc. Try another disc. If the problem goes away, the original disc may be bad. Inspect disc and/or replace it. If disc needs clean
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SYSTEM TROUBLESHOOTING 6. Sound not in sync with picture. *Turn off the DTS player until the audience leaves. Get the DTS numbered leader. Thread it through DTS reader & projector. Put “00” at reader’s lens and find number at sound head. This is your OFFSET number. • If DTS leader is not available, do the frame count method: Count the number of frames from the DTS reader lens to the picture aperture. Multiply the result by 1.25 and subtract one. The outcome is the offset number. Exam
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SYSTEM TROUBLESHOOTING 12. Noise, distortion, and other sound anomalies. * Apparent in optical as well? Not a DTS player problem. Turn off all amps, one by one to localize the problem. If an amp hums or is noisy, replace it. If using Kintek KT-90 subwoofer amps, these are prone to hum because they are self-powered. Check ground wiring. Verify player has the latest TCR (U14 on D422 board) firmware version, as of this writing it is V1.42. Distortion Use DTS Setup Disc to verify DTS
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SYSTEM TROUBLESHOOTING 13. Channel output too low/high and won’t adjust. * Apparent in optical as well? Not a DTS player problem. Are all the amps on? * Apparent in DTS only, turn off the DTS player until there is time to troubleshoot. Use DTS Setup Disc to verify DTS SPL adjustments. Use multimeter to follow the signal path. Monitor signal and turn the DTS level pot. If no change is seen, the pot is bad. Replace player. Is the signal level the same with the DTS disconnected from C
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SYSTEM TROUBLESHOOTING 17. Volume too loud / soft. If the overall volume is too loud/soft: Adjust fader pot on CP. Do not adjust DTS player trim pots behind front panel. If sound level not balanced between analog and digital, verify B-chain alignment. 18. The CP switches out of NON-SYNC to optical at show end causing noise in theater. * Verify no cues are added to film with timecode. The DTS player cannot recognize them. * If the end of the feature has been cut off, add cue to pulse CP
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SYSTEM TROUBLESHOOTING 20. No Subwoofer. * Verify the subwoofer amp is powered on. * Use the DTS Setup disc to verify DTS subwoofer output. * On a CP65, verify the sub switch on the CAT441 is in AUTO. * DTS-6: If subwoofer works in optical and the stereo cable is being used for sub, verify “S1” on the D420 board (inside player) is switched OFF (towards board). * DTS-6: Interfaced with Dolby SR-D? Be sure pins 18 & 24 are jumpered on audio out to CP (use DTS D561 interface cable). * DTS-
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DTS-6 /-6D UNIT TROUBLESHOOTING When making any repairs to the DTS player, be sure to update the TCR firmware (U14 on the D422 board). 1. DRIVE PROBLEMS • Noisy operation • The drive motors on in-service older DTS-6D players are at the end of their useful life. Replace the drive. • Flashing LED • Rapid flashing is normal while playing the digital sound track (off the disc). Slow flashing at a rate of one second indicates the need for service. This may be able to be cleaned with a CD-ROM cl
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DTS-6/D TROUBLESHOOTING 7. WON’T BOOT / LOAD • Verify drive assignments and that each drive is spinning. • Verify that the ROM-DOS chip is programmed with the latest version firmware. NOTE: On DTS players with FUTURE DOMAIN SCSI board, the ROM-DOS RevE is located at U12 on the DTS D422 board. If the DTS player uses ADAPTEC SCSI board, U12 is not used. Instead, AQRM chip is installed in the ACQUTEK board (and not used on D422). • Check the Acqutek “AQRM” chip. If its called “ROMDOSB”, re
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Replacing CD-ROM Drives We have used only two manufacturers of CD-ROM drives, Toshiba and TEAC. Do not substitute with any other manufacturer. Only drives approved by DTS will work. Toshiba / Future Domain SCSI and the “ROM-DOS” chip When replacing drives with ones made by Toshiba, be sure to use the current “ROM-DOS” chip. Remember there are two types of “ROM-DOS” programmed chips available. One is for units with Future Domain SCSI drivers. In this case, the 1Meg “ROM-DOS” program
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REPLACING CD-ROM DRIVES Address the TEAC drives for their location. DTS-6D DTS-6 Termination programmed TEAC 16X Drive A: Jumper 2, 4, 6 Jumper 2, 4, 6 on Pin 4, that should be Drive B: Jumper 0, 2, 4, 6 Jumper 0, 2, 6 removed to activate. Drive C: Jumper 0, 1, 6 TEAC 32X Drive A: Jumper 2 Jumper 2 Termination programmed Drive B: Jumper 0, 2 Jumper 0, 2, 5 on Pin 5, that should be Drive C: Jumper 0, 1, 5 added to activate. 8. Verify the “AQRM” chip is installed in the Acqutec ROM board. The
