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V300-I
TROUBLESHOOTING & REPAIR
F-20 F-20
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PROTECTION BOARD OUTPUT TEST(cont.)
TEST PROCEDURE
12. Open S4 and Turn Power OFF
13. Move probes to test between leads 306 (+) and
275 (-). (See Figure F.6)
14. Turn Power ON and close S4. If voltage is less
than 1 VDC, Protection Board is OK. If voltage is
greater than 14 VDC, Protection Board may be
defective.See Overvoltage Protection DC
Trigger Circuit test, Step 11.
PROTECTION
L7915
306
313
275F
311
J8
J15
FIGURE F.6 - INSERTING PROBES