Velleman projects K8028 Assembly instructions - Manual (Page 10)

10
After doing the self-test the LED’s flash for 5 seconds according to the function currently selected.
The function can be changed during this time by keeping SW1 (pushbutton on the PCB) pressed down until
the flashing stops. By pressing on SW1 successively the LED combination changes each time and thus also
the function.
Once the correct function has been selected, just let SW1 go, after 5 seconds the LED’s start to flash again
for 5 seconds after which the selected function is stored in the memory.Consequently LED 4 will light up
permanently to indicate that the selected function has been memorised.The chosen selection then starts from
its starting position.

Selection 14 & 15 are not saved in memory.
Number of
flashes
Possible cause: Possible solution:
2
Input pushbutton/switch pressed during start up When using a switch this is normal, this fault is not fatal.
Some functions are started up with a closed contact.
3
Error in the voltage zero-cross circuit Check the zero-cross circuit, this consists of the following
components: R17, R18, R19, C11, D3,T3. The mains
frequency must be 50 or 60Hz.
4 EEPROM read and/or write instruction failed. Check the position of the EEPROM (IC2).
Connection and test
H8028IP'2-rev3.pub
page 10 Monday, August 27, 2012 10:04