Fluke 12B, Руководство по обслуживанию

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12B/18/7 Series
Service Manual
3-2
Referring to Figures 3-1 and 3-2 as necessary, disassemble the meter as follows. A
Phillips-head screwdriver and small flat-blade screwdriver are required.
1. Remove the test leads and set the slide switch or rotary knob to OFF.
2. Remove the Phillips-head screws (H1-4) from the case bottom (MP8).
3. Separate the case top (MP2) from the case bottom.
4. TO REPLACE THE BATTERY: Lift the battery from the case bottom and insert a
new 9V battery (NEDA 1604, 6F22, or 006P). Be sure the positive and negative
battery posts are oriented correctly.
5. TO REMOVE THE PCA (A1): Insert a small, flat-blade screwdriver between the
edge of the case top and the pca where shown in Figure 3-3. Gently unsnap a side of
the case top from the pca. Repeat on the other side of the pca. Unsnap the case from
the top of the pca last.
6. LIFT THE PCA FROM THE CASE TOP BY ITS EDGES. If the elastomeric contact
strips (J3, J4)
*
for the switch assembly (S2)
*
and LCD (U3) are stuck to the pca,
remove them without touching the conductive edges.
TO REINSERT THE PCA: Important: First make sure that the slide-switch
actuator (MP5), the slide switch (S1), and the rotary knob (for the 12B and 18) are
in the OFF position. Place the pca over the four screw posts in the case top, then
press gently on the center of the pca while using the small flat-edge screwdriver to
shoehorn the pca under the snap on a side of the case top. Repeat on the other side
and the top.
7. TO REMOVE THE SWITCH SUPPORT (MP6): Use a small, flat-blade
screwdriver to gently unsnap the sides and top of the switch support from the snaps
shown in Figure 3-3.
8. The LCD, switch assembly, slide-switch actuator, and elastomeric contact strips
(J3, J4) for the LCD and switch assembly are accessible and can be replaced as
needed. Do not allow the LCD to get wet. Before installing a new LCD, make sure
that all connector contact points are clean.
Caution
Do not touch the conductive edges of the elastomeric strips or
the contacts on the switch assembly. If they are contaminated,
clean them with isopropyl alcohol.
9. Reassembling the meter is the reverse of disassembling it. After the meter is
reassembled, execute the PERFORMANCE TESTS to confirm that the meter is
working properly.
*
J4 and S2 are not present in Models 7-300 and 7-600.
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