Service manual

Troubleshooting 29
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
NO
A FROM SHEET 1
VOLTAGE
DISPLAY WITH-
IN SPECS?
IS CV
ANNUNCIATOR
ON?
NO
YES
TURN OFF SUPPLY AND CONNECT A SHUNT
(SEE TABLE 3-1) ACROSS THE OUTPUT
TERMINALS. TURN ON SUPPLY AND PROGRAM
FULL-SCALE VOLTAGE AND CURRENT.
READS
OK BUT OUTSIDE
SPECS?
CALIBRATE SUPPLY.
NO
YES
PROBABLE DEFECTIVE A10 BOARD
NO
CURRENT
OK BUT OUTSIDE
SPECS?
CALIBRATE SUPPLY.
C
GO TO SHEET 4
READS
OK BUT OUTSIDE
SPECS?
CALIBRATE SUPPLY.
OUTPUT
CURRENT WITHIN
SPECS?
CURRENT
DISPLAY WITH-
IN SPECS?
IS CC
ANNUNCIATOR
ON?
OV
CONDITION
OCCURRED?
TURN OFF SUPPLY AND REMOVE SHUNT. TURN
ON SUPPLY AND PROGRAM VOLTAGE AND CUR-
RENT TO FULL SCALE. PROGRAM OV TO 1/2 FS
VOLTAGE. CHECK THAT SUPPLY GOES INTO AN
OV CONDITION (PROT ON AND OUTPUT=0).
GO TO "OV WILL NOT FIRE"
TROUBLESHOOTING FIG 3-3.
D GO TO SHEET 3
YES
PROBABLE DEFECTIVE A10 BOARD
PROBABLE DEFECTIVE A10 BOARD
PROBABLE DEFECTIVE A10 BOARD
Figure 3-1. Overall Troubleshooting (Sheet 2 of 4)