Service manual

6. MAINTENANCE
Service Manual BSM-4100 6.9
Data Backup
Item Check Procedure Action
System Setup data
backup
Check that the System Setup data is
saved for a long time after the power is
turned off.
If the System Setup data disappears within 30
minutes after the power off, replace the super
capacitor on the MAIN board with a new one.
Clock function backup
Check that the clock function works
correctly when the power is turned on.
If the clock stops while the instrument is turned
off, replace the lithium battery on the MAIN
board with a new one.
Safety
Item Check Procedure Action
Protective earth impedance
(refer to IEC 60601-1-18.(f))
Check that the impedance between the protective
earth contact and any accessible metal part does
not exceed 0.1
Ω
.
Remove the cause if the
impedance exceeds 0.1
Ω
Earth leakage current (refer to
IEC 60601-1 19)
Check that the earth leakage current does not
exceed 0.5 mArms under normal condition and
1.0 mArms under each single fault condition.
Remove the cause if the earth
leakage current exceeds one of
the maximum values.
Enclosure leakage current
(refer to IEC 60601-1 19)
Check that the enclosure leakage current does not
exceed 0.1 mArms under normal condition and
0.5 mArms under each single fault condition.
Remove the cause if the
enclosure leakage current
exceeds one of the maximum
values.
Check that the patient leakage current to type CF
or defibrillation-proof type CF applied part does
not exceed 0.01 mArms under normal condition
and 0.05 mArms under each single fault
condition.
Patient
leakage
current
Check that the patient leakage current to type BF
or defibrillation-proof type BF applied part does
not exceed 0.1 mArms under normal condition
and 0.5 mArms under each single fault condition.
Check that the patient leakage current to type CF
or defibrillation-proof type CF applied part does
not exceed 0.05 mArms under each single fault
condition.
Patient
leakage
current (refer
to IEC
60601-1 19)
Patient
leakage
current (mains
voltage on the
applied part)
Check that the patient leakage current to type BF
or defibrillation-proof type BF applied part does
not exceed 5 mArms under each single fault
condition.
Remove the cause if the patient
leakage current exceeds one of
the maximum values.
Dielectric strength (refer to
IEC 60601-1 20)
Check that the instrument has the following
withstand voltages.
•
A-a1: 1500 V AC for one minute
•
A-f: 1500 V AC for one minute
•
B-a: 4000 V AC for one minute
•
B-d: 1500 V AC for one minute
Remove the cause if the
instrument does not have all the
withstand voltages.
Perform the following patient safety check after repairing the instrument.