Toshiba Density (Consistency) Meter LQ500, Operation Manual

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70
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6 F 8 A 0 5 2 1
[NOTE]
◆
Fuses are parts with expected life span. Therefore, replace them periodically.
(Recommended replacement cycle: about 3 years)
◆
In general, the service life of an electronic part becomes shorter at higher ambient
temperature. There is a DC switching power supply in the converter that contains
electrolytic capacitors. The service life is about 10 years at the ambient temperature of
20
°
C or about 3 years at 50
°
C. For stable use of the meter for many years, it is desirable
to replace these parts in time. When replacing the capacitors, please contact Toshiba's
Service Dept.
◆
In the event that the characters on the LCD display becomes weak in contrast or edge,
it is considered that the LCD display unit has reached the end of its life. Although such
unsatisfactory visibility may not affect the performance of the density measurement, the
display unit should be replaced if it interferes with the operation. When replacing the
display unit, contact Toshiba's Service Dept.
◆
Regarding the arrester (converter), part replacement differs depending on how often
lightning occurs.
Suppose lightning (induction lightning) occurs twice a year, service life expires in 5 years
and replacement is necessary.
For arrester replacement, an entire arrester unit (board: converter) should be replaced.
To replace the unit, please contact our service personnel.