Tech Note
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Issue Date:
22-Jun-06
Ref. No:
Tech Note: #181
Subject:
Audible tone on output.
Applicability: XTi, CDi, Dsi series amp. Date Code range: Prior August 2006 (0086)
Conditions: After power up an audible tone may be heard in the speakers.
Part Description: R809: C.P.N.: A11368-49910 4.99K 1% 0603 SMT Resistor
R810: C.P.N.: A11368-10020 10K 1% 0603 SMT Resistor
R814: C.P.N.: A11368-40220 40.2K 1% 0603 SMT Resistor
Procedure: 1) Place amplifier on bench and remove the top cover using a Torx 15 bit.
2) Locate and replace resistors R809, R810, and R814 with the values listed above.
See Figure 1 below showing the location of the resistors.
U801
R809
R810
R814
Figure 1
Summary: Performing the procedure outlined in this Tech Note assures the conditions listed will not be present.
Updates covered in this Tech Note have been incorporated into the Main PWA production modules
for this series of Crown amplifiers.
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