Cadence II Fetal Monitor Service Manual
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3.7.3 Display Failure
Phenomenon Possible Cause Solution
①LCD is damaged ①Change LCD
②Bad LCD connecting ② Repair or change
connection wire
③Mainboard is damaged ③Change mainboard
Power on, the
power is normal
but no display, or
improper flashes
④interface board is damaged ④Change interface board
LCD character has
error displays
Invalid LCD numeral tube Change LCD
3.7.4 Power Supply Board Failure
Phenomenon Possible Cause Solution
The fuse burns when
power on
① Short circuit of power
supply or other parts
check again
Disconnect all loads, but
the fuse still be burned
② Power failure
Network power
specification doesn’t fit
Change power supply
Quit till the network power is
solved
The fuse is burned when
connecting some a part
The part is in the status
of short circuit.
Change the parts
Power indicator is on,
but the fan doesn’t run,
the measurement isn’t
normal
+12Vd.c. supply is
damaged
Change power supply
3.7.5 Monitoring Parameter Failure
Phenomenon Possible Cause Solution
① Bad connecting of
transducer.
①Change transducer
② Display has a failure
②See display failure solution
Abnormal FHR display
③ The mainboard
has a failure (FHR1 or
FHR2 has no display)
③Change mainboard
① Bad connecting of
transducer.
①Change transducer
② Display has a
failure
②See display failure solution
Abnormal TOCO display
③ Mainboard has a
failure
③Change mainboard
① Mainboard has a
failure
①Change mainboard
② Transducer has a
failure
②Change transducer
Lower heart beat or no
sound
③Loudspeaker has a
failure
③Change loudspeaker
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