DENON Service Bulletin OST-620 free download

File name Service Bulletin OST-620.PDF

100 Corporate Drive Mahwah, NJ 07430 Service Bulletin No. : OST-620 Date: January 23, 2007 _____________________________________________________________ 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.