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TROUBLESHOOTING & REPAIR |
|
STATIC SCR TEST (continued)
REMOVE PLUGS J10 & J13
PROTECTION/SNUBBER
L9255
J10 | J11 | J12 | J13 | J14 | J15 |
FIGURE F.11 - PROTECTION BOARD PLUG LOCATIONS
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TEST PROCEDURE
1.Remove main supply power to machine
2.Remove plug J10 and J13 from the pro- tection/snubber board. Refer to Figure F.11.
3.Remove red insulating paint from heat sink test points. See Figure F.12. DO NOT DISASSEMBLE THE HEAT SINKS.
4.Using an analog ohmmeter test the resistance from anode to cathode of
SCR1. Reverse the meter leads and check from cathode to anode of SCR1.
A.If a low resistance is indicated in either direction SCR1 is faulty. Replace SCR assembly.
5.Repeat Step 4 testing SCR2, SCR3 and SCR4.
To further check the SCR’s functions use an SCR tester and proceed to active SCR test.
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SCR3
CATHODE
SCR2
SCR4
ANODE
CATHODE
ANODE CATHODE
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SCR1(3 & 4) (1 & 2)
ANODE
PLUG
P10
