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FIGURE F.20 – TRANSFORMER REMOVAL
MAIN TRANSFORMER AND CHOKE
REMOVAL AND REPLACEMENT (continued)
REMOVAL PROCEDURE (cont.)
12. Disconnect the five (5) #215 and the two(2) #210
leads from the Shunt, noting their positions for
reassembly. .
NOTE: It is important that the twisted pair (feed-
back leads) and the meter leads be recon-
nected correctly to the Shunt.
13. Disconnect the four(4) #222 leads from the
Negative Output lead and the two leads from the
30 ⏐ resistor.
14. Unbolt the Output Shunt from the Connection
Strap at the Positive Output Stud and the Negative
Output Lead from the Negative Output Stud.
15. Attach a hoist to the lift bale with very slight ten-
sion to provide support during the following Steps.
16. Remove the mounting hardware (4 places) that
holds the transformer/choke assembly to the base.
Note the sequence of the washers for reassembly.
See Figure F.20
17. Carefully lift the entire assembly out of the
machine and move it to a work bench or other
area where it can be safely disassembled.
18. Remove the SCR assembly. See the SCR
Rectifier Bridge Removal Procedure. Some of
this procedure is already done. Save the hardware
and insulators for reassembly.
19. Carefully grind the welds from the right hand
choke connection to separate the common sec-
ondary strap from the choke. Do not cut the choke
lead or reduce it’s size any more than necessary.
See Figure F.20.
20. Remove the mounting hardware (4 places) that
holds the choke to the top of the transformer. Note
the hardware placement for reasembly. See Figure
F.20.
21. Remove the 4 bolts holding the lift bale assembly
to the transformer and lift it off and remove the
choke.
NOTE: The hole in the lift bale assembly is to
allow access to the mounting bolts with a
socket and extension.
TROUBLESHOOTING AND REPAIR
F-47 F-47
DC-600
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Thread Forming Screw
Plain Washer
Insulator
Insulator
Insulator
Plain Washer
Lock Washer
5/16-18 Hex Nut
Rectifer Mounting
Bracket
Bridge Mounting
Bracket
Transformer
Secondary Lead
‘A’ Lead from
Snubber
Heat Sink
Negative Output Lead
Output Snubber Lead
Choke Lead
Lock Washer
3/8-16 Hex Nut
3/8-16 x 1 Cap Screw
Plain Washers (2)
A
A
A
A
A
A
A
A
A
A
SECONDARY
LEAD CONNECTION
(6 PLACES)
OUTPUT
SNUBBER
CONNECTION
CHOKE
MOUNTING
(4 Places)
LIFT BALE
MOUNTING
(4 Places)
TIG WELDED
CHOKE
CONNECTION
RECTIFIER
MOUNTING
(4 Places)