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JBL Incorporated                     250 Crossways Park Dr.     Woodbury, New York 11797 (516) 496-3400

 Service Bulletin JBL9809 - September 1998

Warranty rate: MAJOR repair

 To:

All JBL Service Centers

 Model:  Harmony AM/FM, CD Compact Sound system

 Subject: Sleep Mode Display Brightness

1)  To access & detach the CD assembly, obtain JBL Service Bulletin #JBL9804 (Harmony Disassembly

Procedure) and  follow steps 1 

−

 7.

2)  Remove the volume control knob by pulling it straight off; remove the 7/16” mounting nut and washer.
3)  To expose the Control PCB follow steps 1 

−

 5 only in the second section of the disassembly procedure.

4)  Unplug the upper connector near the “Snooze” button to be able to separate the two chassis halves;

removing more connectors is not necessary.

5)  Lay the unit’s front half face down on a padded surface.
6)  Pry any beads of hot glue off and away from the 6 connecting tabs holding the Control board in place.
7)  Remove the (3) silver-colored screws holding the control board to the unit.
8)  Carefully pull the connecting tabs back one at a time; remove the Control board from the unit.
9)  Turn board display-side up. Locate R281 and change from a 100

Ω

 to a 27

Ω

 resistor - JBL part# A091270.

10)  Return Control board to unit and reconnect all tabs; follow all disassembly instructions in reverse order.
11)  Observe brightness of the unit’s display in Sleep mode, and test all other functions.

Harmony

AC0022-01001

to

AC0022-03195

Display too dim in Sleep

Mode

Replace R281 with 27

Ω

resistor

Harmony

AC0022-03196

and above

Modified by factory

NONE REQUIRED