Hafler DH-200, Assembly And Operating Instructions Manual

Page: 8 / 21

26 • Prepare two 20" white wires, and twist them together
throughout their length. Six inches in from one end of
the pair, cut one of the wires, and unwind it about
1-1'2" in each direction from the cut. Strip 1 4" of in­
sulation from each of these cut ends. Place the longer
portion of the wire along the lower front edge of the
chassis, with the break at the single fuse clip. Connect
one cut end to TS lug # 2 . Connect the other cut end to
power switch lower lug # 1. The unbroken w ire of this
pair may be placed under the power switch for neat­
ness, and the free ends project from the front corners of
the chassis.
27 • Select the power transformer, four sets of 1'2" long
#10 hardware, and the four flat washers. Position the
transformer so that the red leads emerge near the
center of the chassis. The black and black/white leads
(and all of the brown leads as well, if it is the multiple
voltage version) should project toward the power
switch. Be sure no wires are pinched in the installation.
Place the white twisted pair under the front chassis lip.
Install a flat washer on each screw through a
transformer foot before the nut is secured.
The transformer leads can be trimmed as desired for a neat
job, but be sure you do not cut any of thern too short (panic
ularly if the multiple voltage version is used, and any change
in the supply voltage is likely). Cutting the leads too short for
re-use may void the transformer warranty, if it is thought to
be defective. Alternate wiring diagrams tor the optional
multiple voltage version will be found elsewhere in this
manual. If you have that transformer, consult them before
wiring the transformer and power switch.
Be sure all strands of each transformer lead are tinned and
soldered together before connection to a lug, so that there is
no possibility of a stray strand touching anything but the in­
tended lug.
28 • Connect the black transformer lead to PC lug # 2 .
29 • Prepare a 2" green wire. Connect one end to FC lug
# 2 . (S-2). Connect the other end to PS top lug #3. (S).
30 • Connect the black/white transformer lead to TS lug
#2.
31 • Select the yellow lamp assembly and the spring steel
nut. Trim the lamp leads to 2", and install it from the
outside at HT. The center of the nut curves away from
the chassis when it is pressed over the lamp case. Be
sure it is pressed fully home, so the lamp is tight.
32 D Connect one lead of the lamp to TS lug #2. (S-3). Con­
nect the other lamp lead to PS lower lug #1.
33 • Select the .005 mfd disc capacitor, and trim its leads to
1/2" or less. Connect one lead to PS lug #1. (S-3).
Connect the other lead to PS lug # 2
34 • Select the A C line cord and the plastic strain relief.
Separate the two conductors for 2-1/2". Cut 1-1/2" off
of one of the two leads, and strip 1/4" of insulation
from each lead. Twist the strands tightly, and tin each
end. Nine-and-a-half inches from the longest end,
make a sharp "V" in the cord by bending it back
sharply on itself. Install the strain relief as shown, with
the small end of the strain relief nearest the stripped
end of the line cord. Crimp the two halves of the strain
relief around the wire at the "V" with heavy pliers, to
partially form it before insertion into the back panel.
Then grip the larger diameter of the strain relief with
the tips of the pliers, squeeze it tightly, and insert the
end of the cord and the strain relief through the back
panel hole A C , from the outside. Note that the hole has
a flat on one side, and the strain relief is installed ac­
cordingly. It snaps into position when fully inserted.
Place the line cord under the other wires.
35 • Connect the longer end of the line cord to PS lug #2.
(S-2). Connect the shorter lead to FC lug #1. (S).
36 • Select the two red transformer leads. Connect one lead
to RB lug #2. Connect the other lead to RB lug #3.
37 • Select the .01 mfd disc capacitor, and trim its leads to
3/4". Strip two 1/2" pieces of insulation from the white
wire, and slide one piece over each of the disc capaci­
tor leads. Connect one lead to RB lug #2. (S-2). Con­
nect the other lead to RB lug #3. (S-2).
38 • Prepare a 6" white wire. Connect one end to RB lug
#4. (S). Be sure this is the (+) terminal of the rectifier.
39 • Select one of the round capacitor brackets, two sets of
#6 hardware, one of the 3/4" #10 screws and its nut,
two short #10 SEMS screws (with lockwasher at­
tached), two solder lugs, and one of the large capaci­
tors. Insert the short screws through the solder lugs,
and install them loosely in the capacitor terminals. In­
stall the long screw in the bracket clamp, noting the
direction of insertion in the pictorial diagram (to pro­
vide easy future access), and tighten that nut about half
way. Place the assembly in position on the chassis, on
8