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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-620
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. The noise
level increases at a high-speed rotation due to the metal-bearings on the Fan.
Also, the noise will increase when the Fan is driven at a high-speed.
Solution: The Metal bearing fan has been replaced with the Ball Bearing type
fan.
Parts:
Ref# Description Part Number
ZD901 MTZJ12A 2760644 966
FAN FAN (80*80) 24V (H) 421 0769 001
Serial Number:
The modification differs depending on the production date of the unit as outlined
below:
1) For units that were produced in April 2000 and the before. (Serial Number
004**** and before): Replace the Cooling Fan only.
2) The units that were produced in May 2000 and the after. (Serial
Number005**** and after):
Note: The JV23 Wire on the 1U-2301-1, Regulator Unit has been replaced
with a 82 resistor for reducing the rotation speed.