TM 10-4610-232-12
a. Check to ensure range switch (1, sheet 1) is in the OFF position.
b. Remove a defective battery as follows:
(1) Open the latch (2) on the case (6) and open the case.
(2) Remove all accessories (3) from the foam holder (4). Free the foam holder from under the case lip and pull up
and out. Remove foam base.
(3) Position accessories (3) in foam holder (4) to avoid breaking glass components.
(4) Remove the five drive screws (5) and slide the assembled instrument (14) all the way to the right side of the
case (6), toward foam holder (4) as it is shown in Figure 4-106.
(5) Carefully lift assembled instrument (14) out of the case (6).
(6) Disconnect the black wire (7) from the (+) terminal on the battery (13).
(7) Disconnect the red wire (8) from the (-) terminal on the battery (13).
(8) Remove the two capscrews (9), nuts (10), and Iockwashers (11) that hold the battery bracket (12) to the
nstrument (14).
(9) Remove the battery bracket (12) and battery (13).
NOTE
The lamp used in this meter has a very long life. Always make certain the battery is
charged and not defective before replacing a lamp. Refer to para. 2-6 for operating
procedures.
c. Remove a defective lamp (21, sheet 2) as follows:
(1)
(2)
(3)
(4)
Repeat steps b (1) thru (5) above.
Tag black wires (18 and 19). Loosen screws (16 and 17) at terminals T9 and T10 in terminal board (15).
Disconnect wires (18 and 19) from terminals T9 and T10.
Loosen the two setscrews (20) and pull the lamp (21) straight out of thev barrel (22).
Figure 4-106. Portable Turbidity Meter (sheet 2 of 2)
4-316
