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22. TROUBLESHOOTING
Situation Cause Countermeasure
Example 5
Load does not turn
OFF.
Transistor
output with
clamp diode
• Sneak path due to the use of two power supplies.
• Sneak path occurs when E1 R E2.
• Use only one power supply.
• Connect a diode for a sneak path.
When the load is a relay or similar device, a
reverse voltage absorbing diode must be
connected to it.
(Shown by dotted line in the figure at left)
Example 6
Load does not
operate normally (due
to external shorting,
etc.)
AY60EP,
AY80EP,
AY81EP,
AY82EP,
External load malfunction or incorrect connection.
• Check the external load.
• Check voltages across the following terminals
with output (Y) on.
If output voltage 3V, check external load and
wiring for short circuirs.
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