Service Manuals, User Guides, Schematic Diagrams or docs for : KEF Audio KIT 200 hfe_kef_kit_relay_buzz_rework_procedure

<< Back | Home

Most service manuals and schematics are PDF files, so You will need Adobre Acrobat Reader to view : Acrobat Download Some of the files are DjVu format. Readers and resources available here : DjVu Resources
For the compressed files, most common are zip and rar. Please, extract files with Your favorite compression software ( WinZip, WinRAR ... ) before viewing. If a document has multiple parts, You should download all, before extracting.
Good luck. Repair on Your own risk. Make sure You know what You are doing.



Image preview - the first page of the document



>> Download hfe_kef_kit_relay_buzz_rework_procedure documenatation <<

Text preview - extract from the document

KIT200 / KFDVKT202-05CP31 Rework Procedure
Purpose : Rework on the C383 overheated by R371 and replace with new 85C relay PCB.
Safety Precaution : Please disconnect the AC power cord before rework.

  1)   Remove panel screws (12pcs)




                                       Pull out the Amp Module carefully from cabinet


  2)   Disconnect the wire harnessings attached to the amplifier as shown in below photos.


                                                              CN8
                              CN305




                                                                       SPK2
                        Gnd 2




                       CN 306
                                  Spkout



                                                                    CN 201    CN 202
3)     Remove 2x screws from relay board and pull up the relay board.
                                                                     After Removal of the Relay Board


                     Screw                 Screw




4)     Replace C383 / R370 / R371
a)     Cut off the leads of the original C383 / R371 & R370 on component side of Amp board
b)     Replace capacitor C383 from 50V 47uF 20% to 50V 10U 20% SHOEI 105
  i    Add Oil sleeve to the pins of new C383. Specification (ID=1MM L=10mm*2pcs)
 ii    Lap solder the new C383 (50V 10uF 105C) with same polarity as original shown on the PCB printing.
iii    Add yellow glue to bond new C383 onto neigboring Big E-Cap or PCB Surface.
c)     Replace resistor R371 from 300ohms/1W to 2W 1.5K 5% METAL OXIDE
  i    Add Oil sleeve to the pins of R371. Specification: ID=1MM L1=10mmL2=5mm
 ii    Lap solder the new R371 (2W 1k5ohm 5%)
d)     Replace resistor R370 to a bare jumper wire or 0R0 link.
  i    Lap solder a jumper wire on R370


      Before Change        R370
                                                         After Change                       R371


                                    R371


                                     C383


                                                                                              R370
                                                                     C383



                                                          Bond new C383 onto side of neighboring Big E-Cap
5)   After completing step4, replace the New Relay board with +85C Relays and tighten up the screws.




                                                                  New Relay board
                    Old Relay board




6)   After replacing the New relay board, insert back all the connectors.




                  CN202           SPK2                                       Spkout(Red wire)

        CN201


                                                    GND2(Red/black wire)      GN306




                                GN305                                  GN8
  7)    Assemble back the amplifier and the rear panel.



                                                          w




  8)    General Operation Check for KIT-200

  9)    Packaging

Prepared by CK Wong
Date : Jan 07, 2006
Revision 01 : Item 4c / 4d are revised.

◦ Jabse Service Manual Search 2024 ◦ Jabse Pravopis ◦ onTap.bg ◦ Other service manual resources online : Fixya ◦ eServiceinfo