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TROUBLESHOOTING & REPAIR |
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ACTIVE SCR TEST (continued)
REMOVE PLUGS J10 & J13
PROTECTION/SNUBBER
L9255
J10 | J11 | J12 | J13 | J14 | J15 |
FIGURE F.13 - PROTECTION/SNUBBER BOARD PLUG LOCATIONS.
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TEST PROCEDURE
1.Remove main supply power to machine
2.Remove plugs J10 and J13 from protec- tion/snubber board. See Figure F.13.
3.Remove red insulating paint from heat sink test points. See Figure F.14. DO NOT DISASSEMBLE THE HEAT SINKS.
4.Perform test procedure as outlined in Figure F.15. Repeat test for all four SCR’s
5.Replace any SCR assembly that does not pass test in Step 4
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SCR3
CATHODE
SCR2
SCR4
ANODE
CATHODE
ANODE CATHODE
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SCR1(3 & 4) (1 & 2)
ANODE
PLUG
P10