Greetings all,

Trying to hunt down the following to fix a 727. The unit seems to function perfectly except for outputting sound, and a local Roland repair rep diagnosed its issues to the following:

Parts Info:
Part 1 Description: IC31 (40H174, latch)
Part 1 Qty: 2

Part 2 Description: IC5 (HD6303XO, timing circuit)
Part 2 Qty: 1

Part 3 Description: IC37 (PC624C, DA converter)
Part 3 Qty: 1

Would anyone have any ideas or parts available  I've contacted Roland Corporation and they're well past discontinued. 

Thank you,

Jeffrey