Martindale ET4000 / ET4500 Maintenance
67
8 Maintenance
There are no user serviceable parts inside this instrument, except for the batteries and
fuses under the battery compartment cover.
8.1 Battery replacement
Warning:
Disconnect all test leads and accessories and switch off the instrument before
opening the battery compartment cover. Hazardous voltage inside.
The battery compartment is at the rear of the instrument.
To gain access, undo the 3 screws securing the battery compartment cover, then lift off
the cover.
The position of the batteries can be seen in Figure 3.4: Battery and fuse compartment in
chapter 3.3 Instrument rear.
Fit 6 new 1.5V, AA alkaline batteries (IEC LR6, NEDA 15A) or 6 new rechargeable Ni-MH
batteries observing correct polarity.
Refer to chapter 4.1 Batteries and charging if rechargeable batteries are being replaced.
Replace the battery compartment cover and screws.
Note:- Do not mix old and new batteries.
8.2 Fuse replacement
Warnings:
Disconnect all test leads and accessories and switch off the instrument before
opening the battery compartment cover. Hazardous voltage inside.
Replace the blown fuse with the original type only, otherwise the instrument or
accessories may be damaged and/or the operator’s safety impaired.
There are three fuses under the battery compartment cover.
F1
M 0.315 A / 250 V, 205 mm
Martindale Part No. FUSEM315X3 (pack of 3)
This fuse protects the internal circuitry of the continuity functions if the test
terminals are inadvertently connected to the mains supply voltage during
measurement.
F2, F3
F 4 A / 500 V, 326.3 mm (breaking capacity: 50 kA)
Martindale Part No. FUSEF4AX3 (pack of 3)
General input protection fuses for test terminals L/L1 and N/L2.
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