Fukuda Denshi FCP-7101, Service Manual

Page: 29 / 170

Maintenance
2 - 9
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Date/time changes.
The clock function is performed by lithium battery (BT1) at all times. The
setting of the equipment is backed up for about 5 years, on condition that it
is stored at the room temperature.
Item to Check Method of Checking and Corrective Action Place to Check
Lithium battery
voltage Check that the voltage of the lithium battery (BT1) is
+
2V or higher. Check also that the battery is properly
mounted to the MAIN BOARD.
RT1
REFERENCE
P5-32
Control signal Verify that RTCCE, RTCDATA, and RTCCLK
signals on the IC13 do not become fixed at H or L
each time the date/time is changed in the program
settings. IC13 pin 11,12,13
REFERENCE
P5-32
●
Buzzer would not sound
Item to Check Method of Checking and Corrective Action Place to Check
Program setting Check the program setting to make sure that the
buzzer is not set to OFF, or the volume is set to
extremely low setting. Program setting of the buzzer
Buzzer
Check that the buzzer (Y1) is properly mounted to
the MAIBN BOARD.
Y1
REFERENCE
P5-29
Buzzer signal With an oscilloscope, observe the potential at IC8
pin 103 while the buzzer is sounding, and make
sure it is not a fixed potential.
IC8 pin 103
REFERENCE
P5-29