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Technical information for

HYUNDAI & BMB VCD-800 / 1000

These models where discontinued late 1997



SOFTWARE VERSIONS

There are four software versions for these models, the only one without any known faults is version 4. The only error caused by the software which is not immediately obvious is with version 3, which will play some CDG discs as audio only discs (ie. without graphics), some discs made by 'Standing Ovation' are known to be effected.

The software version can be checked by removing the player top (unplug the power connector first), to the right of the player are the main boards one on top of the other, on the top board the chip with a sticker nearest the front of the player has the software version number written on it.

Software version upgrades are unfortunately no longer available.



MICROPHONE INPUT MODIFICATION

Faults  |  Parts required  |  Corrections  

Customers using the microphone inputs may find it difficult to obtain enough level to project the voice over the music, this is due to design errors made in this section. These are also the cause of the buzzing noise on microphone inputs.
 

FAULT DESCRIPTIONS:

  • The individual microphone amplifiers for inputs 1 & 2 are combined without the use of a mixer section and as such present an amplified load to each other.
  • The input impedance of the microphone amplifiers is too high for most microphones and electronic effects etc. in use today, and will only act as a source of noise.
  • The ADC filter section should be feed from a low impedance source (currently 47k ohms).
  • The insertion of the level control leads has removed C554 from the filter circuit, reducing its gradient and its operating frequency (to app. 14kHz @ -6dB/octave).
  • The level control (as above) has been inserted the wrong way round.
  • The power supply for the analogue circuit has not been HF decoupled to the digital side.
     

CORRECTIONS:

The following steps will correct the above faults, but must only be carried out by a competent electronics engineer, ANY damage caused whilst carrying out these modifications will not be covered under warranty.

Parts required:  

2 of 35mm lengths of linking wire,
2 of 0.47uF NP capacitors
1 of 68k ohm resistor
2 of 4k7 ohm resistor

Method:

  1. Unfasten 'Mic board' from chassis (single screw)
  2. Remove the black and white wires which run to the front panel (Volume control link).
  3. Remove 10k resistor R556 (back of PCB)
  4. Link U2 pin 5 to J501/CON5 pin 6 (signal earth)
  5. Link R555/556/563 junction (Empty pad at rear PCB edge) to U2 pin 6.
  6. Link U2 pin 6 to pin 7 with a 68k resistor.
  7. Link R556/C554/R557 junction (other empty pad) to U2 pin 7 with the
    removed 10k resistor.
  8. Replace the 100k resistors R552 and R560 with 4k7 resistors
  9. Desolder the negative lead of TC553 and remove lead from PCB, lying cap flat.
  10. Reconnect the black volume control wire to U2 pin 1 via the empty component hole from
    above and in doing so bridging the gap cut in the track, between the pad and U2 pin 1.
  11. Reconnect the white volume control wire to TC553's now flying negative lead.
  12. Connect the 0.47uF caps from CON5 pin 6 to pin 1 and pin 6 to pin 2
    (0V to +12V, 0V to -12V)
  13. Reconnect 'Mic board' and test.


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