Service manual

40 Troubleshooting
START
"SLOW DOWN PROGRAMMING"
TURN ON SUPPLY
AND PROGRAM OUTPUT VOLTAGE AND
CURRENT TO 1/2 FULL SCALE.
CHECK VOLTAGE LEVELS AT A10U609-1 AND
A10U610-1 WITH RESPECT TO SECONDARY
COMMON 36 . SEE TABLE 6-3.
A10U610-1
= +2.5V?
A10U609-1
< 10V?
PROBABLE DEFECTIVE A10 BOARD
NO
YES
NO
YES
CHECK FUSES A9F980, F981 BY
MEASURING CONTINUITY
SHOULD TOGGLE BETWEEN <1 V WITH OUTPUT
OFF AND APPROX. 11 V WITH OUTPUT ON
NOTE:
PROBABLE DEFECTIVE A10 BOARD
PROBABLE DEFECTIVE A9 BOARD
Figure 3-10. Slow Downprogramming Troubleshooting)