HARMONY (serv.man4) - JBL Audio Technical Bulletin (repair manual)

harmony (serv.man4) technical bulletin
Model
HARMONY (serv.man4)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
21.72 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
Audio
File
harmony-sm4.pdf
Date

Read JBL HARMONY (serv.man4) Technical Bulletin online

JBL Incorporated                     250 Crossways Park Dr.     Woodbury, New York 11797 (516) 496-3400
Service Bulletin
 Service Bulletin JBL9904 – October 1999
Warranty labor rate: MAJOR repair
 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
Newer version  MAIN PCB
Board has “LVM0199-001 REV B” Printed on it
Board has “LVM0199-001 REV D” Printed on it
No external  capacitors attached to PCB near IC201
2 external capacitors attached to  PCB near IC201
Diode D231 is an axial part
Diode D231 is a SMD 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          button for 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
Serial number
120V
Serial number
230V
Status
Action
Harmony
AC0022-01001
to
AC0022-13000*
AC0023-01001
To
AC0023-135000*
Weak  FM reception
Replace main PCB
with JBL part#
APE0199-02 (120v)
APE0199-001 (230v)
Harmony
AC0022-13001*
And above
AC0023-135001*
and above
New revision
Main PCB
NONE REQUIRED
* Versions of the Harmony Sound system with the “LO/DX” switch at the rear of the unit are the latest version, and need no
modification.
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Here you can read online and download JBL HARMONY (serv.man4) Technical Bulletin in PDF. HARMONY (serv.man4) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair JBL HARMONY (serv.man4) Audio. Information contained in service manuals typically includes schematics / circuit diagrams, wiring diagrams, block diagrams, printed wiring boards, exploded views, parts list, disassembly / assembly, pcb.