HARMONY (serv.man6) - JBL Audio Technical Bulletin (repair manual)

harmony (serv.man6) technical bulletin
Model
HARMONY (serv.man6)
Pages
1 Few pages! See other manuals at the bottom of the first or last page.
Size
53.12 KB
Type
PDF
Document
Technical Bulletin
Brand
Device
Audio
File
harmony-sm6.pdf
Date

Read JBL HARMONY (serv.man6) Technical Bulletin online

JBL Incorporated                     250 Crossways Park Dr.     Woodbury, New York 11797 (516) 496-3400
Service Bulletin
 Service Bulletin JBL9808 - September 1998
Warranty rate: MAJOR repair
 To:
All JBL Service Centers
 Model:  Harmony AM/FM, CD Compact Sound system
 Subject: Loss of all Control Functions or FM station Presets
In the event you receive a Harmony sound system for the complaint “all the controls stopped working”
or “the FM station presets disappear, even though I’ve never unplugged the unit”, perform the
following modification.  This should also be performed as an upgrade if a unit is serviced for any
reason in the serial number range listed below:
1)  To access & detach the CD assembly, obtain JBL Service Bulletin #JBL9804 (Harmony Disassembly
Procedure) and  follow steps 1 
 7.
2)  Locate R264 and change from a 4.7k
 to a 2.2k
 SMD resistor 
 JBL part #QAF0650-222.
3)  Locate R286 and change from a 82k
 to a 68k
 SMD resistor 
 JBL part #QCF0851-683.
4)  Continue with step 8 of the Harmony Disassembly Procedure to remove the CD assembly from the Main
     PCB.  It is not necessary to remove any cable connectors to perform the next step.
5)   Locate Lithium Battery BT201 located at the edge of the Main PCB; replace with JBL part
# FBE0030-001.  Battery with clips must be desoldered from Main PCB.
6)  Attach CD assembly back onto Main PCB, and replace assembly back into unit following all disassembly
     instructions in reverse order.
7)  Test unit by confirming all controls work and FM station presets hold their memory.
NOTE:  
The R286 silkscreen on the Main
PCB may be illegible or mismarked as
“R73S”.
Model
Serial number
120V
Serial number
230V
Status
Action
Harmony
AC0022-01001
to
AC0022-36021
AC0023-01001
to
AC0023-15720
Lithium battery
circuit failure
Change R264 from 4.7K to 2.2K
Change R286 from 82K to 68K
Replace battery BT201
Harmony
AC0022-36022
and above
AC0023-15721
and above
Modified by factory
NONE REQUIRED
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Here you can read online and download JBL HARMONY (serv.man6) Technical Bulletin in PDF. HARMONY (serv.man6) technical bulletin will guide through the process and help you recover, restore, fix, disassemble and repair JBL HARMONY (serv.man6) 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.