Harmony Service Bulletin Jbl9904; Cover - JBL HARMONY Service Manual

CD Player/Tuner Stereo System
Service Bulletin JBL9904 – October 1999
To: All JBL Service Centers
Model: Harmony AM/FM, CD Compact Sound system
Subject: Weak FM Reception
In the event you receive a Harmony sound system with the complaint "poor FM stereo reception", and FM
reception does not improve by using the larger dipole-type FM antenna supplied with the unit, check the rear of
the unit and see if there is a "LO/DX" switch. If there is no "LO/DX" switch, then the main PCB should be
replaced as per the instructions below:
Note: It is very important that the various screws do not get mixed up and inserted in other locations upon
reassembly. Make note, or label each removed screw set, and keep them apart from other screw sets.
1)
Unplug all cables & connectors; place the unit on padded surface.
2)
Carefully pry the speaker grille out of its recess and remove.
3)
At the rear of the unit, remove the (4) screws holding the top cover on. Two are directly underneath the
handle and two are near the center of the unit.
4)
Slide the top cover straight back and off the unit, exposing the CD mechanism.
5)
At the front of the unit directly below the CD tray, remove the two CD mounting screws.
6)
Pull the CD mechanism out and away from the unit. Looking at the rear of the unit, the right side will
pull away first and "pivot" around a thick wire cluster on the left side of the cabinet.
7)
Unplug all connectors; make note of colors and locations - do not mix upon reassembly.
8)
To separate CD assembly from Main PCB:
a) Remove the two lower, outermost screws from the small heatsink.
b) Remove the (4) silver-colored screws from the bottom of the PCB.
c) Remove the single screw from the RCA jack bracket.
d) Lift the CD mechanism off the PCB and carefully unplug the (4) remaining connectors.
9)
Replace Main PCB with:
120v version - JBL part# APE0199-002, 230v version - JBL part# APE0199-001
Older version MAIN PCB
Board has "LVM0199-001 REV B" Printed on it
No external capacitors attached to PCB near IC201
Diode D231 is an axial part
10)
Reattach main PCB to CD assembly and follow all disassembly instructions in reverse order until unit is
fully assembled.
11)
Reattach either external FM antenna supplied with the unit. Plug in the power cord.
12)
Test unit by pushing "AM/FM" button on Harmony or its remote control, then push the
one second and release for Harmony to begin tuner search for various stations.
13)
Mark the bottom of the unit, under the base, with a bold black marker – "JBL9904".
Model
Harmony
Harmony
* Versions of the Harmony
modification.

HARMONY SERVICE BULLETIN JBL9904

Serial Number 120V Serial Number 230V
AC0022-01001
to
AC0022-13000*
AC0022-13001*
Sound system with the "LO/DX" switch at the rear of the unit are the latest version, and need no
Warranty labor rate: MAJOR repair
Board has "LVM0199-001 REV D" Printed on it
2 external capacitors attached to PCB near IC201
AC0023-01001
to Weak FM reception
AC0023-135000*
AC0023-135001*
New revision Main PCB
and above
Newer version MAIN PCB
Diode D231 is a SMD part
button for
Status
Replace Main PCB with
APE0199-02 (120V)
APE0199-001 (230V)
NONE REQUIRED
HARMONY
Action
JBL part#
1 0