JBL PSW 1000 (serv.man3) Service Manual / Technical Bulletin ▷ View online
Service Bulletin
Service bulletin JBL9702 - May 1997
Warranty labor rate: MINOR repair
To:
All JBL Service Centers
Models: PSW1000, PSW1200
Subject: Cycling ON & OFF every five seconds
In the event you receive a PSW1000 or PSW1200 with the complaint that the unit is cycling off & on
approximately every five seconds:
approximately every five seconds:
Procedure:
Remove the amplifier from the subwoofer enclosure and check the main PCB for the presence of R135,
(100 ohms). If R135 is present at the location shown on the drawing below, remove it by cutting both
leads. After removing R135, reassemble the product and verify proper operation by applying a 70 Hz,
25mV signal (with the volume control halfway to full CW) to the low level input jacks. When the signal is
applied the 70 Hz tone should be audible from the woofer, and the unit should no longer cycle on & off
every five seconds.
(100 ohms). If R135 is present at the location shown on the drawing below, remove it by cutting both
leads. After removing R135, reassemble the product and verify proper operation by applying a 70 Hz,
25mV signal (with the volume control halfway to full CW) to the low level input jacks. When the signal is
applied the 70 Hz tone should be audible from the woofer, and the unit should no longer cycle on & off
every five seconds.
JBL Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400
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