Pentax ASAHI SPOTMATIC 23102 Service Manual page 37

2) How to Adjust the 3µA Tester
The 3µA tester must always function to discharge the rated 3µA current from its output terminals. Accordingly,
before using it, check it to ensure the output of the rated 3µA current as per the following instruction.
a. First, connect the red and black terminals of the 3µA tester with the red and black lead wires, respectively, as
illustrated on the previous page.
b. Then connect the red and black clips of the lead wires to the minus (-) and plus +}) terminals, respectively,
of a circuit tester which is capable of measuring 3µA current.
c. Watching the reading of the circuit tester, adjust the current of the 3µA tester by turning the adjusting knob
with a screwdriver until the circuit tester reads 3µA If the reading is below the rated 3µA, turn the knob
clockwise: if it is above, turn the knob counter-clockwise.
d. With the foregoing processes, the 3µA tester now discharges the rated current.
e. When not in use, be sure to switch off the tester.
f. Use Mallory RM640, National M-N mercury battery or equivalent for the tester (the same one used for the
SPOT Exposure Meter.) When the needle does not move when connected with the circuit tester, the battery
may be considered as exhausted. Replace the battery.
g. The switch of the tester will be "on" (or "off") at a first push of the button, or will be "off" (or "on") at a
second push of the button, as the case may be. Therefore, push the button at least twice. In the event the
needle does not move even at a second push, it is due to the exhaustion of the battery.
23102 Page 36