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F-42 TROUBLESHOOTING AND REPAIRF-42
SCR RECTIFIER BRIDGE
REMOVAL AND REPLACEMENT PROCEDURE (cont.)
FIGURE F.17 – RECTIFIER ASSEMBLY
TO LEFT SIDE
OF CHOKE
OUTPUT
SNUBBER
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GATE LEAD
CONNECTOR
BUSHING
"A" LEAD, WHITE (6 PLACES)
"C" LEAD, RED (6 PLACES)
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| A |
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| LEFT SIDE |
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A |
| OF CHOKE | A | A |
| SECONDARY |
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| |
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| A | A | |
| LEAD (6 PLACES) |
| A | |
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| MOUNTING |
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| BOLTS (4) |
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| A |
| A |
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| A |
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| A |
| A |
215 |
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210 | A |
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A |
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OUTPUT |
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| A |
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SHUNT |
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CONNECTION |
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| |
STRAP |
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| |
| A |
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|
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REMOVAL PROCEDURE
1.Remove the input power to the
2.Remove the case sides and top and lower the nameplate.
NOTE: Before removing the Rectifier Assembly pay particular attention to the original place- ment and location of the electrical connec- tions to assure proper reassembly. Tag any leads where the Lincoln lead number is not evident.
3.Disconect J4 from the firing PC Board and push it and the plastic bushing through the bottom of the control box.
4.Disconnect the Output Snubber lead from the left side of the Choke and remove the Output Snubber from the left side rectifier mounting bracket. See Figure F.17.
5.Disconnect the #210(2) and #215(5) leads from the Shunt, noting their positioning for proper reassem- bly. See Figure F.17.
6.Unbolt the Shunt from the Connection Strap at the Positive Output Stud. See Figure F.17.
7.Remove the four (4) mounting bolts, noting the placement of the insulators and hardware for prop- er reassembly.
8.Remove the rectifier assembly from the machine. Loosening the Choke mountings will increase the flexibility of the bracket and make it easier to remove the rectifier.
NOTE: Lincoln Electric does not recommend replacement of individual SCRs. In the event of a failure, the entire assembly should be replaced.
