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 Suchen bei A-Z-E:
05.12.2024 04:09

Modifying a DBox I from SAT to Cable

deutsche Version hier

Unnessesary to mention, but: Your warranty will be voided by doing this modification!!

This modification is significantly easier than the other way round, from cable to SAT.

In the placement drawings the colors mean:

Add parts/connections, rsp. remove crossed parts marked BLUE. And, of course, the present SAT tunerboard of your receiver has to be changed to a cable tuner board.
And you have to drill two holes in the backcover as the aerial connectors of the cable tuner are at a different place than the one of the sat tuner.

So:

  • short IS05 pins 3 and 4 (pin3 to ground)→ a drop of tin will do...
    (this disables the 22k switching tone generator)
  • short TS09 base-emitter path → a drop of tin again...
    (this disables the 13/18V switching)
  • short TS10 base-emitter path → and again...
    (this disables the 13/18V adjustment)
  • short DS22 → put a wire across it
  • change RS24 to 2.1k → put a 4.7k across the present 3.83k
  • change the tunerboard
  • NOTE: if using a NDT tuner (not DF1CSxxxx), move RC28 to position RC29 (located on the solder side beneath the connector to the tunerboard)
  • adjust the software!
After doing the modifications, check that the voltage at the wire now replacing DS22 is about +12V (±0.15V) measured against i.e. the tuner shield.

Diagram
Placement drawing (top side)
Placement drawing (bottom side)

ATTENTION! Workability of the modification has not yet been confirmed!

Good luck! I Hope, I didn't forget anything...

01.11.2024
E-Rechnungspflicht ab 1.1.2025
Wir sind bereit für den Empfang und unsere Firmenkunden erhalten von uns ab sofort eine Rechnung im ZUGFeRD Format (PDF mit eingebetteter XML).
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