PIC Frisbee
www.kitronik.co.uk
Fault Finding Flowchart
Start
Do LEDs
1, 2, 3 light in turn
(and at the right
brightness)?
No
(if fitted) does
the buzzer sound
after the LEDs?
Yes
Are all the
LEDs now off?
Check
• IC1 pin 2 for a dry joint
• The sounder connections for
dry joints
There is a dry
joint on R1
Do the LEDs
turn on when spun
a 2
nd
time?
Yes
No, they all stay off
Check
• IC1 pin 4 for a dry joint
• SW1 & SW2 for dry joints
No
Stop
Yes
Go to page 2
Yes
No, all the LEDs are on
Do all the
LEDs light when the
board is spun?
No, the pattern restarts
Yes
There is a dry joint on
IC1 pin 8
No, the pattern restarts
There is a dry short on
IC1 between pins 3 & 4
Are there
any other issue?
No
Yes, it wont program
Yes, the pattern restarts
when knocked
Check
• IC1 pin 2 for a dry joint or
short to pin 1
• All pins on the programming
connector for dry joints
• R2 is 10K and R3 is 22K
There is a dry
joint on C1
