Fluke 190-104/190-204
Service Manual
6-4
6.2.3 Opening the Test Tool, Removing the Battery Pack
Proceed as follows:
1. Remove the battery access door with a standard blade screwdriver by turning the
plastic battery door screws one-quarter turn counterclockwise.
2. Take the battery out of the instrument.
Note: take care not to short circuit the battery’s contacts. Do not open or damage the
battery’s housing.
3. When present, take off the Hang Strap and the Side Strap (refer to 6.2.2.).
4. Loosen the two selftapping screws 10 mm long (total length) that fix the grey/yellow
Input Cover that is around the BNC-input sockets.
5. Take the Cover off.
Note: when reinstalling the Input Cover do not forget to reinstall the flexible Sealing
Strip around the BNC-input sockets! The holes in this strip have a flat side that must
align with the flat side of the BNC input sockets.
Note: when reinstalling the Input Cover, do not forget to reinstall 6 steel pins (2x17
mm) in the left and right side of the instrument. The pins are used to attach the Hang
Strap and the Side Strap.
6. Remove 2 screws M3x6 from the Bottom Holster. The screws fit into square nuts that
in tun fit into the Rear Case. Take care that the nuts are not lost.
7. Take the Bottom Holster off.
Note: when reinstalling the Holster, take care to reinstall two steel pins (2x17 mm) in
the left and right side of the instrument. The pins are used to attach the Side Strap.
Take care that the yellow covers of DC-input and USB-inputs are correctly in place.
8. Remove four selftaping screws 16.5 mm long (total length) that attach the Rear Case.
Two of these screws are located in the battery compartment.
9. Take the Bottomholster off.
Note: when reinstalling the Bottomholster, do not forget to put the steel plate 16x17
mm in place again. This plate is present in the cavity on the right-hand side of the
instrument and can be used to insert a Kensington Lock.
Note: when reinstalling the bottom case, take care that flat cables to LCD and
keyboard are not damaged.
6.2.4 Getting access to Top Side of PCA
Most of the measuring points are located on the top side of the PCA. To get access to this
side, remove the upper plate (Shielding Lid):
1. Remove 4 screws M3x4 with a spring-washer (left and right side, bottom side).
2. Remove 4 screws M3x8 that are grouped in a square around Sampling chip N2000.
3. Take the screening plate off to get access to the top side of the PCA. Before doing
this observe how this plate fits on to the lower chassis.
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