Katolight E6921M1 / REO2IMI — Rotating Rectifier Assembly Check Out
Testing & diagnosis
For the Katolight E6921M1 / REO2IMI, from the Katolight service manual.
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Before you start
- Complete entire series of checks before performing any repair.
- Replace any components which do not have the resistance readings indicated.
Procedure
- Disconnect and identify armature leads (item 9) and field leads (item 8).
- Remove nuts from diodes D5 and D6; pull diodes away from printed circuit board, leaving soldered connection intact.
- Visually inspect for discoloration or visible damage to large power resistors (item 7) and PCB rings.
- With ohmmeter R x 1, check resistances across diodes (items 1 and 2); very high one direction, approximately mid-scale other.
- With ohmmeter R x 1000, check resistance across rectangular white resistors (item 4); reading other than open.
- With ohmmeter R x 1, check resistance across large power resistors (item 7); reading other than open.
- With ohmmeter R x 1, measure resistance across small resistors with colored bands (item 6); reading other than open.
- With ohmmeter R x 1, check zener diodes (item 5); approximately mid-scale one direction, very high other.
- Check SCR with R x 1: very high one direction, lower other; jumper positive meter lead to small SCR lead should read mid-scale.
Tools required
- Simpson 260 VOM or equivalent ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Katolight service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.