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Home โ€บ Forums โ€บ Product Discussion & Questions โ€บ BeoGram โ€บ Question About Beogram 8002 Recapping โ€บ Reply To: Question About Beogram 8002 Recapping

#64491
marcham
BRONZE Member

Evening, all.

I was able to track down the issue for my last problem and now have my +15V, -15V, and +5V rails. ๐Ÿ‘

However, I still have problems with the unit and suspect the CPU. Current problems include a constantly spinning turntable, no response to keyboard input, and a display that goes between showing one dot and multiple dots. Iโ€™ve confirmed the keyboard presses do take the appropriate pins low.

Here are my readings; does all look okay from the CPU side of things?

  • PIN # 1, 5V, DATA LINK
  • PIN # 2, 5V, KB: PLAY
  • PIN # 3, 5V, KB: STOP
  • PIN # 4, 5V, KB: DOWN
  • PIN # 5, 5V, KB: UP
  • PIN # 6, 5V, KB: 45
  • PIN # 7, 5V, KB: 33
  • PIN # 8, 5V, KB: PAUSE
  • PIN # 9, 4V, DATA LINK
  • PIN # 10, 2V, CRYSTAL
  • PIN # 11, 2.3V, CRYSTAL
  • PIN # 12, 0V, GROUND
  • PIN # 13, 5V, DIGIT SELECT OUT
  • PIN # 14, 5V, DIGIT SELECT OUT
  • PIN # 15, 0V, DIGIT SELECT OUT
  • PIN # 16, 5V, DIGIT SELECT OUT
  • PIN # 17, 5V, BCD OUT
  • PIN # 18, 5V, BCD OUT
  • PIN # 19, 5V, BCD OUT
  • PIN # 20, 5V, BCD OUT
  • PIN # 21, 5V, ?
  • PIN # 22, 3.5V, INDICATOR
  • PIN # 23, 5V, KB: TURN
  • PIN # 24, 2.5V, LIFT
  • PIN # 25, 5V, <<
  • PIN # 26, 5V, >>
  • PIN # 27, 5V, SLOW <<
  • PIN # 28, 3V, SLIDE TACHO
  • PIN # 29, 3V, SLIDE TACHO
  • PIN # 30, 5V, 5V
  • PIN # 31, 0V, LIFT MANUAL
  • PIN # 32, 0V, SO
  • PIN # 33, 5V, DISC DETECTOR
  • PIN # 34, 5V, SLOW DOWN
  • PIN # 35, 5V, FAST UP
  • PIN # 36, 0V, SLOW UP
  • PIN # 37, 5V, FAST DOWN
  • PIN # 38, 2.5V, POWER ON/OFF
  • PIN # 39, 4.5V, RESET
  • PIN # 40, 0V, SPEED SENSOR

Note that PIN 38 is sitting at 2.5V (is that correct?); I thought it should be either 0V or 5V.

The same comment goes for a few other pins. I thought it would be either low (0V) or high (5V).

Thanks.

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