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• Lower the ambient temperature to
35
°
C or less
• Lighten the heating overload within
cooling capacity
• Clean up the air filter (Refer to 7.3,
Cleaning and Maintenance of Product)
• Make sure that the refrigerator fan
operates normally.
• Make sure that the power supply voltage
is normal.
• Halt the refrigerator for an appropriate
period of time, and restart the unit.
Performance of vacuum pump is deteriorated
due to suction of acid or water.
Replace the oil. If the performance
does not recover, repair the equipment
Water or ice remains in the cold trap.
Remove the ice, and then discharge
the water from the drain pipe.
Specified amount of oil is not
filled in the vacuum pump
Check the oil level, and refill the oil
up to the specified amount.
Refrigerator switch is not turned on.
Turn on the refrigerator switch.
Refer to the column of
“Cooling is insufficient. ”
Refrigerator alarm appeared.
Refrigerator-overload-relay-
holding-circuit activated.
Ref.Alarm
Ref.Alarm lamp is lighted,
and refrigerator stops.
* Trap Temp. display blinks
measured temp. value
• Ambient temperature exceeds 35
°
C.
• Used under heating overload
exceeding cooling performance.
• Air filter is clogged.
• Refrigerator fan is not operating.
• Power supply voltage dropped.
• Refrigerator is started (operated)
under overload.
* If several causes are considered,
conditions of operation differs.
Alarm for malfunction in
guidewire of temp. sensor
Guidewire of temp. sensor has
malfunction.
Alarm
Lit
0000
Trap Temp. display
PrEr
Trap Temp. display
Lit
Alarm
Vacuum pump does not
emit light exhaust noise
when 30 seconds passed
since it had been started.
(Pressure is not lowered)
Connecting hose between the vacuum
pump and the equipment is removed.
Drain cap is detached.
Drain cock is not closed completely.
Cold trap is not mounted securely.
Fix the drain cap to the drain hose.
Mount the trap securely again.
Make sure that the direction of the drain
cock is appropriate. And close the cock tightly.
Remove the objects.
Objects entered into the contact surface
between the chamber lid and packing.
Though vacuum pump is stopped,
normal pressure can not be
regained
Leak filter is clogged.
Replace the leak filter. Refer to 7-1,
Consumable Parts Replacement.
SYMPTOMS
CAUSES
SOLUTIONS
Insert the connecting hose into the hose
nozzle securely.
Vacuum pump emits
light exhaust noise.
However, pressure is not
lowered appropriately.
Though refrigerator switch is turned
on, cooling is not sufficient.
A
lar
m
M
e
s
s
a
g
e
Stop the operation immediately,
and contact your sales dealer
or nearest service center of
Tokyo Rikakikai.
Guidewire of vacuum sensor has
malfunction.
Alarm for malfunction in
guidewire of vacuum sensor