CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19
ELECTRICAL TROUBLESHOOTING-Continued
DRIVER'S PERISCOPE-Continued
WARNING
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.
A
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 paragraph 6-15). If
voltage is not present, go to step B.
B
Disconnect wire 516 from B.O. receiver lamp. Place
red lead of multimeter in wire 516 and check for
voltage. If voltage is present, replace lamp socket
(see paragraph 6-29). If voltage is not present,
repair/replace wire 516 of switch panel to gage panel
and miscellaneous switches wiring harness (see
paragraph 6-56).
C
Remove infrared power supply to driver's periscope
lead assembly from driver's periscope. Place red lead
of multimeter in wire 517 and black lead to ground.
Turn MASTER and B.O. RECEIVER switches on and
check for voltage. Turn MASTER and B.O.
RECEIVER switches OFF. If voltage is present, notify
Direct Support Maintenance. If voltage is not present,
go to step D.
2-250
