Tech Note
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Issue Date: 16-Aug-07
Ref. No: Tech Note# 190
Subject: XTi/CDi/DSi Display boards
Information Only Apply to Service Units Only Update Stock & Service Units
Applicability: XTi Amplifiers: below serial number 8001377031
CDi / DSi Amplifiers: below serial number 8001377296
Conditions: Erratic volume, no audio or intermittent audio on the output. The Signal LED may stay lit even
without audio output.
Part Description: 138911-4; XTi Display board “New”
138912-4; CDi/DSi Display board “New”
Procedure: When an XTI, CDI, or DSi amplifier is returned with a complaint of changing volume level or
intermittent output audio, replace the display board with a 13891X-4 or greater revision.
Figure 1
Root Cause: Damage to the solder-in end of the ribbon cable during manufacture. The new connector, (see
Figure 1 above, picture shown is of the CDi/DSi display board), is more robust and not easily
damaged. In some instances topside solder on R73/R74 potentiometers can cause the erratic
volume. In either case the display board with 13891X-4 or greater revision will resolve the
issue.
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