Service Manuals, User Guides, Schematic Diagrams or docs for : . Rare and Ancient Equipment LUXOR TV Stereo Plus 2 chassis SP2-01-01

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                                                                                                   Ref: 01M742, -812

Stereo Plus 2                       Service Bulletin: 01-01
                                                                                                   May -01


Chassis:      Stereo Plus 2              SN- and SW-chassis with PFC circuit (Power Factor Correction)

Module:       Main board            B****B*
                                    C****B*
              PFC version can be identified from a chassis code, the 6th character B means PFC version
              In addition the power supply controller in PFC version is a version of TDA16846

Finding:      Interference over the whole screen with a poor signal level on VHF1 band

Spares:         Item          Old part                     New part                        Part number               Note
1a)             CO24          2n2 400V Y                   1n0 400V Y                      3261 0922
1b)             CO75          --                           1n0 400V Y                      3261 0922

2a)             RO12          15R 0805                     33R 0805                        3142 5808
2b)             W53           Jumper 11.25mm               Coil AX 4.7uH 620mA             4562 0008
2c)             CO76          --                           330p 2k0V                       3279 0042

Note:         First please try to eliminate the interference by a ferrite antenna cable
              If it will not help, make the modification / modifications below

Modification 1
This is the most important modification, which has been implemented in production as a running
change starting from 23.01.2001. If not installed do the following.

1a)           Change capacitor CO24 to a value of 1n0 400V Y. See picture 1.

1b)           Install new capacitor CO75 (1n0 400V Y) as follows:
              - Drill a new hole according to picture 2 (can be seen also in pictures 3 and 4).
              - The right hole place is exactly in the corner of the printed isolation border marking.
              - Install capacitor as shown in picture 3. Other leg to the new hole and the other one to the
              hole of "not-installed CO74".
              - Blend the leg coming from the new hole so that you can solder it to the ground pad of
              the cooling plate. See picture 4.
              Note! Capacitors are safety components, so please pay attention to the Electricity Safety.
              The isolation gap between primary and secondary must be always at least 6mm.

c)            Check the picture quality, if interference has been disappeared, everything is now ok.



Notice !   The Publisher of this Service Bulletin assumes no responsibility for any financial claims resulting from the
           information of this document.
Note!         Bigger picture and more detailed instruction by clicking the picture.




                         Picture 1                                                     Picture 2




                          Picture 3                                                     Picture 4

Modification 2
If still interference visible although the Modification 1 has been implemented, please make another
modification.

2a)           Change resistor RO12 to a value of 33R 0805 (locates on the foil side between switching
              transistor VO15 gate and power controller NO01 pin 13).
2b)           Change jumper W53 to the coil 4.7uH 620mA (W53 locates near by connector XK05).
2c)           Add new capacitor CO76 (330p 2k0V).
              - Capacitor will be connected to the holes of "not-installed CO74 and RO107".
              - The other leg comes to the same hole than the CO75 and the other one to the near
              RO107 hole.
              - Now CO76 should be located between TO02 pin 19 (VO30 anode) and ground.

Notice !   The Publisher of this Service Bulletin assumes no responsibility for any financial claims resulting from the
           information of this document.

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