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LN-15
F-12 F-12
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TROUBLESHOOTING & REPAIR
TEST PROCEDURE
1. Remove input power to the LN-15.
2. Perform the Cover and Spindle Mount removal
procedure.
3. Locate the Boost Power Board. See Figure F.1.
4. Apply the correct DC voltage to the LN-15 (15-110
VDC).
5. Check for the correct input voltage to the Boost
Power Board at leads 526A (+) to 527A(-) (15-110
VDC). See Figure F.3. If the input voltage is not
present check the input rectifier bridge and associ-
iated circuits. See the wiring diagram.
6. Check for approximately 80 VDC at leads 501(+) to
502(-) . See Figure F.3.
7. Check for approximately 80 VDC at leads labeled
POS to NEG. See Figure F.3.
8. If the correct input voltage is present in step 5 and
either of the voltages in steps 6 or 7 are not present
the Boost Power Board is faulty. Replace.
BOOST POWER BOARD
FIGURE F.1 – BOOST POWER BOARD LOCATION
BOOST POWER BOARD TEST (continued)