Whelen 800DHAP - Manual (Page 3)

Page 3
Assembly of strobe power supply assembly to die cast base, to
ensure prevention of an electrical short circuit between parts:
TOP VIEW OF TRANSISTOR
MOUNTING BOSS
CHO-THERM INSULATOR AND TRANSISTOR TO
BE SECURED BETWEEN TRANSISTOR SPRING
CLIP AND TRANSISTOR MOUNTING BOSS.
WRAP ONE END OF TRANSISTOR
SPRING CLIP AROUND ONE END
OF TRANSISTOR MOUNTING BOSS PUSH OTHER END OF TRANSISTOR SPRING
CLIP AROUND OTHER END OF TRANSISTOR
MOUNTING BOSS
IMPORTANT: Read all warnings on first page before attempting disassembly
of the strobe light power supply and base.
This page describes the assembly procedure
of the strobe light power supply to the die-cast
base. It is extremely important that the assem-
bly steps, as described below, are precisely
followed to insure the proper insulation of
the strobe light power supply from the die cast
aluminum base.
FIGURE 1. Lower the power supply assembly
onto the die-cast base, with the 3 mounting
holes lined up with the holes located on the
three mounting studs of the cast aluminum
base. During this assembly operation, the
transistor on the power supply assembly has
to be positioned on the outside of the
transistor mounting boss. Secure the strobe
light power supply assembly to the mounting
studs with enclosed self- tapping screws.
FIGURE 2. Slightly bend the transistor on the
power supply away from the transistor mount-
ing boss. Slip the Cho-Therm insulator behind
the transistor with the hole directed towards
the top (See figure 4”A”).
Position the top of the Cho-Therm insulator
against the circuit board of the power supply
assembly, making sure that some of it shows
below the transistor (See figure 4”B”). It is
important that the transistor on the power sup-
ply assembly does not contact the transistor
mounting boss at any place, to prevent a dam-
aging electrical short circuit between the
strobe power supply and the die-cast base.
FIGURE 3. Use the transistor
spring clip to secure firmly the
Cho-Therm insulator and the
power supply transistor to the
mounting boss of the die-cast
base. Wrap one end of the clip
around one side of the mounting
boss, then press the other end in
position using needle nose pliers.
FIGURE 5
Strobe
Power
Supply
Assembly
Input
Control
Pigtail
Assembly
Tape
Green
Wire
Optic
Dome
- Tall
(if present)
Optic
Dome
(if present)
Base
Screws
Base
Screws
Spring
Clip
Xistor Mt.
Die Cast
Base
1" NPT
Pipe
Mounting
Screws
1234
4321
BROWN
WHITE
BLACK
RED
1 2 3
1 2 3