
I‑5039
45
23 WHAT YOU NEED TO DO BEFORE CALLING A SERVICEMAN
SYMPTOM PROBABLE
CAUSE
MEASURES
Battery has run out.
Check the battery and replace the dry cells
if the red lamp alone lights up.
Nothing appears on
the display when
the POWER switch
is turned ON.
Dry cells are set in wrong directions.
Correct the orientation of the dry cells.
Malcontact failure of grip switch
Correct the connection of the grip switch
connector.
The time has not been set in DOWN
or REPEAT ON mode.
Set the mode to DOWN, and press the
LAP/SPLIT/RESET button
Failure to press the SET switch after
setting the initial value.
Press the SET switch after setting the time.
In the repetitive upcounting mode,
the LAP/SPLIT/RESET button was
not pressed for zero resetting.
Press the START/STOP button for zero
resetting.
ST-306 will not
respond to the
START/STOP
switch
START/STOP button was pressed
by mistake when you should press
the LAP/SPLIT/RESET button.
Press the START/STOP button.
Malcontact failure of extension cable
Correct the cable termination.
The FUNCTION switch setting is not
in agreement with the external
equipment
Correct the FUNCTION switch setting, and
power up the MODEL ST-306 again.
The FUNCTION switching was set
preposterously after POWER ON.
Set the FUNCTION switch first, and then
turn the POWER switch to ON.
The DISPLAY switch is turned OFF.
Turn the DISPLAY switch to ON.
Nothing is
displayed when
external equipment
is connected.
External equipment is not
functioning.
Turn on the external equipment, signal
switch, etc. to send signals.