Download Onkyo TXDS989 docs - Audio equipment,digital audio, home audio, professional audio systems service manuals and repair information
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|Onkyo-TXDS989 rec.pdf||Ref: DS989-DSP-2
TX-DS989 With THX-ULTRA-2
Addition or omission of parts.
When servicing the DSP of TX-DS989 with the optional THX ULTRA-2 upgrade, make sure to refer to this page as well.
R769 Removed R770 Removed
Do Not attempt to modify the hardware of a none THX-ULTRA-2 unit assuming THX-Ultra will work. The upgrade requires software also. Since the upgrade is sold separately as an option, this information must be treated as supplemental technical information for those units having such an upgrade already in place.
Parts location ID listings in Blue block at the top are for Q721 corresponding to PIN 1~6 and 40 ~ 44. The parts location listings within the yellow block correspond to the SM components associated to Q721 pin# 18 ~ 28. As the arrow indicates, a wire from a removed R768 solder landing that connects to IC Q761 pin #22 location (below) is connected to R745 which is also connected to pin#3 of IC Q721.
Note: All connections at Q761 are in direct rel|
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