How to do GM Tech 2 scanner KEYPAD Test ?

Following are the steps to do keypad test for GM Tech 2 diagnostic scan tool:

Step 1:Select F4 Tool Options

Step 2:Select F3 Self Test

Step 3:Connect the CANdi Interface and ALDL loopback. 

Step 4:Select Selectable Main PCB

Step 5:Select F3 Keypad

Step 6:Press F0 Key

Step 7: Press F1 Key

Picture No.7 is to test F0 key, key Pressed status: pass mean F0 key is working. You have to test one-by-one: F0-F1-F2-F3-F4-F5-F6-F7-F8-F9-EXIT-ENTER-?
Do not skip any of the key.