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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-615
Date: January 23, 2007
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Model: AVR-3300
Subject: The cooling fan is noisy.
Symptom: The customer complains the cooling fan is too noisy.
Solution: Lower the voltage to the Cooling Fan.
Apply the following modification to the Regulator Unit (1U-3201-1):
1) Remove the Jumper-wire JV23 from the P.W.B. and replace it with an 82,
1W resistor.
2) Replace diode ZD901 (MTZ12A) with an MTZJ9.1CT77 style diode.
Parts:
Ref# Description Part Number
JV23 RS14B3A820JNBST(S) 244 2055 983
ZD901 MTZJ9.1CT77 276 0635 917
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