JBL HARMONY, Service Manual

Page: 9 / 57

HARMONY SERVICE BULLETIN JBL9809
Service Bulletin JBL9809 - September 1998 This is considered a Major repair
To: All JBL Service Centers
Model: Harmony AM/FM, CD Compact Sound system
Subject: Sleep Mode Display Brightness
In the event you receive a Harmony sound system with the complaint “the display is too dim in the Sleep mode”,
perform the following modification:
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
W
to a 27
W
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.
Model
Serial number
120V
Status Action
Harmony
AC0022-01001
to
AC0022-03195
Display too dim in Sleep Mode
Replace R281 with 27 W
resistor
Harmony AC0022-03196
and above
Modified by factory NONE REQUIRED
9
CD Player/Tuner Stereo System HARMONY