Service Bulletin - JBL Northridge E-Series E150P Service Manual

E150P subwoofer

Service Bulletin

Service bulletin # JBL2005-01 December 2005 Warranty labor rate: MINOR repair
To: All JBL Service Centers
Model: E150P, E250P Subwoofers
Subject: "Chirp" Noise on Power-Up
In the event you receive an E150P or E250P with the complaint: "the subwoofer make a slight "chirp"
noise when it becomes active from the stand-by mode", perform the following modification.
Synopsis: Change C65 PE capacitor from 470µf to 47µf.
1) Remove the amplifer from the enclosure.
2) Remove the cover.
3) Change C65 Electrolytic capacitor from 470µf,16V to 47µf,16V, JBL part# 034-470515-200. Observe
polarity.
4) Replace cover, replace amplifier in enclosure, test subwoofer.
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