Sorensen DCS-E Series - Page 42

MAINTENANCE SORENSEN DCS SERIES MANUAL 4-4
CHECK ANODE CR24
CHECK
CR29,Q5,T4
A
C
A
U
X
I L I
A
R
Y
INPUT LOW
USE OSCILLOSCOPE TO CHECK
FOR SQUARE WAVES ON THE
APPROX 720V pp @ 70KHz
PRIMARY OF T1
APPROX 12V pp @ 70KHz
PRIMARY OF T2
USE OSCILLOSCOPE TO CHECK
FOR SQUARE WAVES ON THE
CHECK U6-11 AND U6-14
FOR 12V PEAK 70KHz
SQUARE WAVES
CHECK DC VOLTAGE AT U8-16
CATHODE OF DIODE CR18
CHECK THE DC VOLTAGE AT THE
CONNECTOR J3 PINS 9 AND 11
CHECK THE DC VOLTAGE AT
ANODE OF DIODE CR18
CHECK THE VOLTAGE AT THE
U4-1, U15, U7-1
CHECK CURRENT CONTROL CIRCUIT
VOLTAGE CONTROL CIRCUIT
U5, U7-2
CHECK
CHECK 1mA CURRENT
U2-1, U2-2, Q1, Q2
SOURCES
REPLACE U6
CHECK
R107A-110A, CR51-58
R107-110, Q13-16
OUTPUT BUS BAR ASSY, T1
OUTPUT RECTIFIERS, L3
CHECK
P301-304, C51-53, C301, C302
CHECK U3-2
OVP SHUTDOWN
REMOTE SHUTDOWN
CHECK U1
CHECK ANODE CR11
THERMAL SHUTDOWN
CHECK RT1, U8-3
CHECK ANODE CR27
CHECK ANODE CR32
+12V LOCKOUT
CHECK 06
CHECK ANODE CR33
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
CHECK
DRIVE FETS
Q7-12, 18 AND 19
HIGH
APPROX 5V
HIGH
LOW
PRESENT
NO WAVES
HIGH
LOW
LESS THAN 5V
LOW
WAVES PRESENT
WAVES PRESENT
WAVES PRESENT
NO WAVES
PRESENT
NO WAVEFORMS
PRESENT
AUX SUPPLIES
OK
C
A
U
T
I
O
N
MAKE OSCILLOSCOPE CONNECTIONS WITH THE UNIT SHUT OFF
ENSURE THAT THE UNIT IS ISOLATED FROM
THE AC LINE OR DAMAGE TO THE UNIT
AND/OR TEST EQUIPMENT MAY RESULT
From Figure 4-1A
Figure 4-1B
www.valuetronics.com