Any ideas on what is up here?

 |  IP: Logged

On the failure-to-switch problem, it is hard to say where the fault is at this point. We need to do some simple tests first. I am assuming you can manually switch the MOD IIC to any format you want.

Remove the db25 connector from the MOD IIC. Manually switch the MOD IIC to DIGITAL format. Then take a jumper wire and momentarily ground pin 13 (upper row, left end pin)on the MOD IIC db25 connector. Verify the the MOD IIC has gone into either STEREO SR or A format. (Whether it goes into SR or A will depend on a jumper setting on the format card.) If this test works, then the MOD IIC is probably OK. PLEASE NOTE: it may be difficult to get a good connection on the db25 connector. You need a small enough piece of wire to go into the pin 13 hole and actually make contact with the pin.

If the first test fails, then do the same thing except you will momentarily ground the STEREO SR or STEREO A format terminal on the back of the MOD IIC. If this works, then the problem could be a defective MOD IIC motherboard trace or solder connection between the db25 connector and the format terminals.

Also, disassemble the DB25 connectors on both ends of the DTS interface cable and inspect the solder connections. Look for broken wires. Repair as needed, or order a new cable if the cable has problems.

Regarding the problem on right surround, my best guess is that the surround eq card is at fault. Pull the card and look at the back of the card (solder side). See if there are 2 diodes soldered on the solder side of the card. If they are not there, then this board needs to be modified. Or, we will be happy to send a replacement board. Contact me for details. Without the modification, the board will SOMETIMES be prone to latch up the voltage regulators on power up. This will result in a noise on one or both surround channels.

Hope this info helps.

------------------
Oscar Neundorfer
Chief Engineer
SMART Devices, Inc.

One more thing to check. Remove power from the MOD IIC. Now, pull the format card. Look for a jumper near the upper edge of the card, a couple of inches in front of the gold edge connector fingers. The jumper pins are labeled OPT DEF which stands for Optical Default. The jumper should be on 2 of the pins, either A or SR. This jumper determines whether the MOD IIC goes back to A or SR if digital fails.

------------------
Oscar Neundorfer
Chief Engineer
SMART Devices, Inc.

Movies discs each are programmed to default to whatever analog format the film was mixed in. If it is in "SR", that is the format the DTS will pulse to (in the event of a DTS drop-out).

The "hitch" comes in when the CP you have does not have "SR". In that case you will have to make a modification to the DTS logic card so that the "analog" pulse will always to sent to "A" Type. Depending on the model of DTS logic card, it will mean either moving a programming jumper to "A" -or- doing a trace cut & adding a jumper. Please send me an email and let me know the model of DTS player (2-drive or 3-drive) and model of DTS logic card you have = it should be D???