Global Specialties PB-500 - Manual - Manual (Page 9)

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5. Speaker
a) Jumper "SPKR -" to "GND" and "SPKR+" to "SOR".
b) A 1KHz tone should be audible from the speaker.
c) Remove the jumper between "SPKR+" and "SOR" and the tone
should no lon ge r b e audible
6. Uncommitted Switches (SI & S2 )
(S1)
a) Set SI to the "1,2" position.
b) Jumper "SQR" to " Sl -2" and "SPKR+" to "Sl -1"
c) A 1KHh z tone should be audib le from the speaker.
d) Set SI to the "2,3" position.
e) The tone should no lon ger be aud ible
f) Mo ve the jumper from "Sl -1" to "Sl -3".
g) The tone should be a udible.
h) Set SI to the "1,2" position,
i) The tone should no lon ger be aud ible.
j) Remove jumpers (e xcept for "SPKR -" to "GND" ).
(S2)
a) Set S2 to the "1,2" position.
b) Jumper "SOR" to " S2 -2" and "SPKR+" to "S2 -1".
c) A 1KHz tone should be audible from the speaker.
d) Set S2 to the "2,3" position.
e) The tone should no lon ger be aud ible
f) Mo ve the jumper from "S2 -1" to "S2 -3 ".
g) The tone should be audible.
h) Set S2 to the "1,2" position.
i) The tone should no lon ger be aud ible.
j) Remove all jumpers.
7. Uncommitted Pots (R21 & R22)
10k (R21)
a) Set the 10k slide r to it's left -most position.
b) Connect an ohmmeter (10 k ran ge ) between "10k -1" and " 10k -2".
c) The meter should read ze ro ohms.
d) Mo ve the slider gra dually to the right a nd observe the
ohmmeter.
e) The reading on the meter should incre ase from 0 to 10k ohms i n
proportion to the m ovement of the slid er.
f) Mo ve the ohmmeter lead from "10k -2" to "10k-3" and che ck for
appro ximate ly 10k ohms.
100k (R22)
a) Set the 100k slide r to its left -most position.