PIC Frisbee
www.kitronik.co.uk
No
Which LED is dim?
LED1 – R4 is the wrong value
LED2 – R5 is the wrong value
LED3 – R6 is the wrong value
R4 – R6 should be 330
Ω
(orange, orange, red)
Check
• BAT1 & BAT2 are in the
right way (the ‘+’ is visible)
• The batteries are good
• IC1 pin 1 for a dry joint
• C1 for a short
No
Yes, but looking carefully
it is just very dim
Did any
LEDs light?
Is just one
LED missing from
the pattern?
Yes
Which LED is missing?
LED1
(check the following)
• LED1 for a short, dry joint and that its in
the right way around
• IC1 pin 7 for a dry joint or short with pin 8
• R4 for a dry joint
LED2
(check the following)
• LED2 for a short, dry joint and that its in
the right way around
• IC1 pin 6 for a dry joint or short with pin 5
• R5 for a dry joint
LED3
(check the following)
• LED3 for a short, dry joint and that its in
the right way around
• IC1 pin 3 for a dry joint
• R6 for a dry joint
Yes
From page 1
Which
bold
text best describes the LED?
Only LED3 lights
• There is a short on IC1 between pins 6 & 7
LED1 flashes on & off
• There is a dry joint on either R2 or R3
The LEDs flash LED3, gap, LED1
• The test chip (IC1) is in the wrong way
around
As LED3 turns on LED1 briefly goes on
and then the pattern repeats
• There is a short on IC1 between pins 2 & 3
Fault finding flowchart
page 2
