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Page Title:
Chapter 3. REPAIRS AND ALIGNMENT |
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  REPAIRS AND ALIGNMENT
Section I. REPAIRS
(3) Remove the nut and washer on the
switch shaft.
Most of the parts of Power Supply PP-3514/
(4) Unsolder the leads from the switch
U can be reached and replaced without special
and remove the switch.
procedures. The following precautions apply
b. Replacement.
specifically to this power supply.
(1) Install the replacement switch in the
a. Use a pencil-type iron with a 25-watt max-
chassis and solder the leads as shown
imum capacity. This power supply is transis-
in figure 3-1.
torized. If the iron must be used with ac, use
(2) Replace the nut and washer on the
an isolating transformer between the iron and
switch shaft.
the line. Do not use a soldering gun; damaging
(3) Replace front panel METER RANGE
voltages can be induced in components.
switch knob and replace the chassis
in the case.
b. When soldering transistor leads, solder
quickly; wherever wiring permits, use a heat
sink (such as long-nosed pliers) between the
3-3. Replacement of SHORT CIRCUIT CUR-
soldered joint and the transistor. Use approxi-
RENT MA Switch S2
mately the same length and dress of transistor
leads as used originally. In replacing transis-
a. Removal
tor Q1, be careful to note how the nylon bush-
(1) Remove the chassis from the case.
ings are installed in the mounting holes. They
(2) Remove the knob from the front pan-
must be reinstalled properly since the case of
el SHORT CIRCUIT CURRENT MA
the transistor is not at chassis potential.
switch.
(3) Remove the nut and washer from the
swiTch shaft.
S3
(4) Unsolder the leads from the switch and
remove the switch.
b. Replacement.
a. Removal.
(1) Install the switch in the chassis and
(1) Remove the chassis from the case.
solder the leads as shown in figure
(2) Remove the knob from the front pan-
el METER RANGE switch.
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