0000 Appears During Current Measurement; Changing The Batteries - Bosch MMD 302 Original Instructions Manual

5.4 0000 appears during current
measurement
The current-measuring ranges of the MMD 302 are pro-
tected against overloading by two built-in fuses. If the
measured value reads 0000 during current measure-
ment, the fuses must be checked as follows:
1. Switch off the power supply to the measuring object
and remove the measuring cables.
2. Connect the red cable to the test connection of
diode testing (fig. 1, pos. 12).
3. Turn the measurement-mode switch (fig. 1, pos. 8)
to the position, switch over to diode testing
by means of the blue function button (fig. 1, pos. 2).
4. The battery voltage and the diode symbol appear in
the display.
Testing the fuse for the mA ranges
¶
Connect the red test probe to the test connection
for mA (fig. 1, pos. 10).
"
The indicated value should be approx. 1.5 V. If the
displayed value remains unchanged (approx. 3 V), the
F1 fuse is faulty and must be replaced.
Testing the fuse for the A range
¶
Connect the red test prove to the test connection
for A (fig. 1, pos. 9).
"
The indicated value should be approx. 0 V. If the dis-
played value remains unchanged (approx. 3 V), the F2
fuse is faulty and must be replaced.
Robert Bosch GmbH
Maintenance | MMD 302 | 23
5.5

Changing the batteries

The batteries may only be changed when the
MMD 302 is not connected to a measurement
object!
Fig. 2: Changing the batteries
1 Housing upper section
2 Housing lower section
3 Protective rubber
4 Battery holder
5 1.5 V battery
1. Remove measuring cables from the measuring object
and the MMD 302.
2. Turn the measurement-mode switch to the OFF posi-
tion.
3. Remove the three screws from the back of the appli-
ance.
4. Lift the lower end of the housing lower section until it
clicks out of the housing upper section.
5. Remove the battery holder.
6. Remove protective rubber and empty batteries.
7. Insert new batteries (type, Micro / AAA / AM4 / LR03
/ MN2400-1.5 V).
!
The discharged batteries constitute special waste
and must be disposed of accordingly!
8. Slide the protective rubber back over the battery
holder.
9. Reinsert the battery holder in the appliance. When
reassembling the appliance, ensure that the battery
cables are not crushed.
10. Check that the O-ring and the rubber seal are
positioned correctly between the upper and lower
housing sections.
11. Reattach lower housing section. Ensure that it clicks
into place at the upper end of the housing.
12. Reinsert and tighten the three screws.
en
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1 689 979 642 2014-11-03