JBL PowerBass PB10, Руководство по обслуживанию

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TECH TIPS
Troubleshooting tips and solutions to common service problems
For models: PB10, PB12 (Revision 2) * TIP# JBLTT2003-04
Subject: Replacing MOSFETS Q18, Q22
In the event you need to replace MOSFET transistors Q18 or Q22 as part of a repair, it is important to use
ONLY the JBL part# FE106401110 or only the brands: International Rectifier, or Fairchild.
Replace both Q18 and Q22 MOSFET’s in the circuit, even if only one seems to be damaged.
Do NOT mix & match these components from different manufacturers, or batches. They should be
identical.
* Late version PB10 or PB12 subwoofers (Revision 2 in the service manual) can be identified by:
•
Amplifier serial number starts with “HA”
•
Output transistors in the open, on a large black heatsink
•
Large plastic cup enclosing the rear of the amp assembly
•
Main PCB, bottom, solder-side contains all SMD devices