d. Reassembly.
(2)
Remove the control rectifier and relay
rectifier
(1) Install the terminal board (para 6-16).
(3)
Remove the capacitor (para 6-10).
(2) Install the discharge resistor (para
Remove the discharge resistor (para
(4)
6-11).
(3) Install the capacitor (para 6-10).
Remove the terminal board (para 6-16).
(5)
(4) Install the control rectifier and relay rec-
c. Cleaning ard Inspection.
tifier (para 6-9).
(1) Clean the relay panel with an approved
(5) Install the control relays (para 6-15).
cleaning solvent and dry thoroughly.
e. Installation.
(2) Inspect the relay panel for dents, breaks,
(1) Refer to figures 6-5 and 6-6 and install
cracks, or other damage.
the relay panel assembly.
(3) Replace a defective relay panel as neces-
(2) Install the side shrouds (para 3-13).
sary.
Section Il. RECTIFIERS, CAPACITORS, AND RESISTORS
(2) Refer to figures 6-7 and 6-9 and remove
6-8. General
the control rectifier, the relay rectifier, and the
The control rectifier provides dc voltage for the
main power rectifier.
welding current control circuit. The relay rectifier
When malfunction of the sele-
Warning:
provides de voltage for the dc control relays. The
nium rectifier occurs, thoroughly ventilate the
main power rectifier provides dc voltage for dc
area to prevent inhalation of poisonous fumes. Do
straight or reverse polarity welding.
not handle the damaged rectifier while it is warm,
to avoid absorption of the poisonous selenium
6-9. Rectifiers
oxide compound through the skin. Failure to ob-
a. Removal.
serve this warning can result in severe injury or
(1) Remove the side shrouds (para 3-13).
death.
board, removal and installation, Model DAR300HFSG.
