Datasheet

Record Playback Essentials
www.kitronik.co.uk/2149
Continued
from page 1
Yes - but it was distorted,
crackled or hard to hear
over the noise
Check
 For dry joints on R3 or R4.
 M1 for a short or dry joint.
 IC1 for a short on pin 4.
 IC1 for a dry joint on pin 12.
 C5 for a short.
Check
 R5 for a dry joint.
 SW2 for dry joints.
 IC1 for a short or dry
joint on pins 2 or 10.
Yes
Press the play button
Was the
message played
back?
Check
 C6 for a dry joint.
 IC1 for dry joints
on pins 6 or 8.
No - there was silence,
hiss or a click noise
stop
Was the play
back silent?
Yes
No - there was hissing
Check
 R5 is in the right
place.
 IC1 for a short
between pins 8&9.
No - there was a click at
the start of playback
Press the play
button again
Did the
LED light?
No
Yes - whilst the
button was pressed
Yes - at the end
of the silence
Check
 SP1 for dry joints.
 IC1 pins 7 & 9 for dry
joints.
There is a short on
IC1 between pins
1&2.
Fault finding flow chart
page 2