Calibration error & communication failure

Newbie here.
EDU09 assembled; EDU software loaded with success
Calibration failure

Calibration results:

CH1 offset at 5V/div : 161 OK
CH1 offset at 1V/div : 201 FAIL
CH1 Y-position low 0
CH1 Y-position mid 0
CH1 Y-position high 0

after this the message “Communication failure” is shown

T1,T2,T3 are placed correctly
5V on input
IC2 placed with dot towards notch picture on board, No notch on IC!

can you give names to the different sections of the diagram of the circuit

Thx in advance Pieter Z

Most probably the charge pump is not working.
Please check the -5V is present on pin 7 of IC1.
For more details please see:

You can return the EDU09 for inspection/repair to your local Velleman dealer or direct to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere

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