15.4.1 Replace battery cells and remove isolation tab
The battery cells are housed in the lower section of the MTR105, behind the rotary switch. Looking at the back of
the instrument, the lower (battery) cover incorporates a stand and has the replacement cell types written on it.
NOTE:
When replacing the battery cells, there is an approximate 3 minute window in which the MTR105 will retain
the settings for date and time. If left longer these settings will have to be re-made. If using the MTR105 for the first
time remove and discard the battery isolation tab (3).
1. Remove the test leads and ensure the MTR105 is switched off.
2. Slacken one captive cross-point screw (1) which is centred at the top of the cover.
3. Battery cover (2) will now lift away from the top.
4. Ease out of lugs at the bottom of the cover.
5. The six battery cells (4) can now be lifted out of the compartment.
Caution: Ensure the new cells are replaced in the correct polarity as indicated on the cells and battery
compartment.
Caution: Ensure all battery cells are of the same type, do not mix Alkaline, NiMH and Lithium.
6. Replace all six battery cells (4).
7. Replace the battery cover (2) in reverse order to above.
8. Re-secure with screw (1).
15.4.2 To replace the fuses
Caution: Glass fuses must not be used.
The fuses are housed in the upper section of the MTR105, behind the display. Looking at the back of the instrument,
the upper cover has a fuse symbol on it.
1. Remove the test leads and ensure the MTR105 is switched off.
2. Slacken one captive cross-point screw (5) from the left hand side of the top cover (marked fuses).
3. Fuse cover (6) will now lift away from the left hand side.
4. Ease out of lugs at right hand of the fuse cover.
5. The two fuses (7) can now be accessed and removed.
Caution: Ensure correct replacement fuses are used, 500 mA (FF) H. B. C. 30 kA minutes 1000 V (32 mm x 6
mm) refer to
Refer to 16. Specifications on page 80
.
6. Replace fuses (7) as required.
7. Replace the fuse cover (6) in reverse order to above.
8. Re-secure with captive screw (5).
NOTE:
Fuses on the P terminals are not user replaceable. If these fail the instrument must be returned to Megger
for repair.
Maintenance
www.megger.com
79
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