Driver's periscope malfunctioning.
B.O. receiver lamp fails to light but driver's periscope operates. Do step 1.
Driver's periscope fails to operate.
Do steps 3 thru 7.
Both lamp and driver's periscope fail to operate. Do steps 6 thru 7.
Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts a metal surface a direct
short may result in instant heating of tools, damage to equipment, and injury or death to personnel.
Remove B.O. receiver indicator lamp from socket. Place red lead of multimeter in socket and black
lead to ground. Turn MASTER switch on and check for voltage. Turn MASTER switch OFF. If voltage
is present, replace lamp (see WP 0164 00). If voltage is not present, go to step 2.