JBL P 7520 (serv.man13) Service Manual / Technical Bulletin ▷ View online
JBL Incorporated 250 Crossways Park Dr. Woodbury, New York 11797 (516) 496-3400
Service Bulletin
Service Bulletin JBL9803 - August 1998
Warranty labor rate: MINOR repair
To:
All JBL Service Centers
Model: Power Series P-7520
Subject: Defective Wiring Harnesses
Early versions of the High Level Input Wiring Harness supplied with the Power
Series P-7520 automotive amplifier had the colored-coded wires connected to
the wrong points in the male connector. If wire colors are observed during
installation, this will result in one speaker being out of phase, musically, with the
opposite channel. This will not affect amplifier performance or safety in any
way, but may affect overall sound quality.
Series P-7520 automotive amplifier had the colored-coded wires connected to
the wrong points in the male connector. If wire colors are observed during
installation, this will result in one speaker being out of phase, musically, with the
opposite channel. This will not affect amplifier performance or safety in any
way, but may affect overall sound quality.
What to do if you do not have the correct harness:
If installer does not want to order and wait for new harness, they can use the old harness using the
following connections:
If installer does not want to order and wait for new harness, they can use the old harness using the
following connections:
Harness:
Gray/Blk wire to +L out from Source
White wire to
White wire to
−
L out from Source
Gray wire to +R out from Source
White/Blk to
White/Blk to
−
R out from Source
It is only when the wire colors on the incorrect harness are followed according to the owner’s manual and
connected to the customer’s source wires where it will result in an out-of-phase connection.
connected to the customer’s source wires where it will result in an out-of-phase connection.
Or, the correct harness may be ordered from JBL, part # HA1217.
Display
