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100 Corporate Drive Mahwah, NJ 07430
Service Bulletin
No. : OST-638
Date: April 26, 2007
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Model: AVR-5800
Subject: Countermeasure for Pop Noise on the PRE Output.
Symptom: The unit produces the Pop Noise when switching functions.
Solution: Please apply the following modification (upon claim only).
On the EXT IN VOL Unit (1U-3295):
1) Replace "2SC3326" muting transistors, TR805, 806, 809, 810,813, 814, 817
and 818 with new KTC2875 Transistors. (Eight transistors)
2) Replace 10-ohm resistors R827, 828, 843, 844, 859, 860, 875 and 876 with
new 220-ohm resistors. (Eight resistors)
Parts:
Ref # FORMER NEW
Description Part Number Description Part Number
TR805, 806, 2SC3326 273 0414 906 KTC2875 273 0460 905
809,
810,813,
814, 817,
818
R827, 828, RM73B--100J 247 2002 964 RM73B--211J 247 2005 987
843, 844,
859, 860,
875, 876
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