Instruction manual

V
20A
A
COM
V
ΩΩ
TEST PROCEDURE - BLOCK 2
Procedure 3
If you do not have a multimeter, skip to procedure 4.
DC Test
Make sure that the power switch is in the OFF
position. Reconnect the 9V battery to the battery
snap. Set the multimeter to read on the 20V scale
and connect to the circuit as shown in Figure 20.
Connect the positive voltage probe to pin 12 of the
integrated circuit U1. Connect the common probe to
the negative lead from the battery. Turn the power
ON. The multimeter should read between 4.5V and
5.5V. If not, turn off the power and check that coil L5
is correctly installed. Also, check for solder shorts,
unsoldered leads, or an open copper run between
the positive side of C14 and coil L5.
-16-
Figure 20