Doepfer MTC64 Relay Board - Manual (Page 7)

Check list
If the MTC relay board does not work at the first go please check these points:
• Does the MTC64 main board alone work correctly ? Check especially the correct
Midi channel, note/program change range, mode and polarity. Please refer to the
user's manual of the MTC64 main board for details and do the basic tests with a
LED described on page 13.
• Is the MTC64 main board equipped with 74HC4094 (instead of CD4094) ? This
could happen only if an old MTC64 main board is used. For orders of MTC relay
boards together with MTC64 main boards this cannot happen.
• If the outputs of the MTC relay board behave the other way round the polarity of
the MTC64 outputs has to be changed (Jumper 5 / JP7 on main board).
• Are all ribbon cable connections between main board and relay board carried out
in the right way and is the polarity of the 10 pin ribbon cable correct ?
• Are the relay terminals (X1...X16) connected in the right way ?