Tektronix 2467B

INVERTER TOUBLESHOOTING PROCEDURE
INVERTER
TRGUBLESH0OTIN6
PROCEDURE
DISCONNECT OPTIONS
(P302 AND P303)
FROM INVERTER BOARD
* NOTE: BY USING TWO PS503S,
THE INVERTER MAY BE CHECKED
WITHOUT USIN6 THE LINE POWER
OR LINE-ISOLATION TRANSFORMER.
REMOVE COMB
CONNECTOR P232
CONNECT «SVO
LOAD (DESCRIBED
ATLEFT1T0J303
REPLACE
OPEN
FUSE(S)
REMOVE COMB
CONNECTORS
P233 AND P234
FAILURE TO START
IS CAUSED BY THE
REBULATOR BOARD
NOT DRAWIN6 POWER.
USING THE RE6ULAT0R
REPAIR NOTES IN
THAT PROCEDURE AND
THE THEORY OF
OPERATION, REPAIR
THE SUPPLIES IN THE
F0LL0WIN6 ORDER:
• 10VREF,»87V,
♦42V.M5V, *SV.
-I5V,-8V,-SV,
♦5VD
PROBLEM
IS ON
INVERTER
BOARD
CHECK FOR
EXCESSIVE
LOADINB BY
REGULATOR
BOARD
(SHORTED PASS
TRANSISTOR OR
REGULATOR 10
CHECK
01050,01060
01070, CR1060
ANDCR1070
FOR SHORTS
YES
INSERT AN
ISOLATION XFMER
IN LINE SUPPLY
UNSOLDER AND
LIFT THE END OF
W1060 NEAREST
PIN 7 OFT 1060
CONNECT THE
PRIMARY TEST
LOAD (DESCRIBED
AT LEFT) BETWEEN
THE LIFTED END
DFW1060ANDTHE
SOURCES OF 01060
AND 01070
POWER UP AND CHECK
FOR 120V (PLUS A 1V
P-PTRIAN6LEWAVE)
ACROSS LOAD
CHECK CURRENT
LIMIT (01040,
CR10401AND
DUMMY LOAD
(C1072) FOR
SHORTS
REMOVE PRIMARY
TEST LOAD AND
RESOLDERW1060
CHECK P232,
P233, AND P234
FOR SHORTS TO
6R0UND ON THE
UNREGULATED
SUPPLY LINES.
ALSO CHECK FOR
SHORTS ACROSS
CR1101.CR1102,
CR1130.CRI131.
CR1124.AND
CR1121.
YES
REPAIR SERIES
REGULATOR MADE
UP OF 01060
AND ASSOCIATED
PARTS
REPAIR INVERTER
DRIVE CIRCUIT
U1062, U1064,
AND U1066
ANY
SHORTS?
NO
REPLACE
SHORTED
COMPONENT
YES
REMOVE PRIMARY
TEST LOAD AND
RESOLDERW1060
REPLACE
01060 AND
01070
2465B/2467B Service
TURN OFF THE
LINE VOLTAGE
AND DISCONNECT
THE PRIMARY
TEST LOAD
CONNECT THE ♦ OUTPUT
OF A DC POWER SUPPLY
(PS503)T0THE
JUNCTION OF R1020 AND
CR1022. CONNECT THE
- OUTPUT TO THE
CATHODE OF CR10S0
CONNECT A DMM SET
TO MEASURE VOLTAGE
BETWEEN THE CATHODE
DFCR1023ANDTHE
CATHODE OF CR1050
TURN THE PS503 ON
AND SLOWLY RAISE
ITS OUTPUT TO 28V
MOVE THE*
OUTPUT OF THE
DC POWER SUPPLY
TO THE CATHODE
OFCR1023
REDUCE OUTPUT LEVEL OF
DC POWER SUPPLY UNTIL
DRIVE FROM U1030 STOPS
REDUCE PSS03
OUTPUT LEVEL
TO 16V
CHECK 01021.01022,
VR1020.Q 1040, AND
ASSOCIATED CIRCUITRY
DISCONNECT THE
DC POWER
SUPPLY (IES)
CHECK Q1050
FOR OPENS
CHECK SUPPLY
COMPONENTS
CR1022. R1020,
ANDC1025
CHECK CURRENT
LIMIT CIRCUIT
Q1040 AND
ASSOCIATED
COMPONENTS
CHECK C1071.
R1071.CRI072.
AND R1072
CHECK SLOW-
START COMPONENTS
C1034ANDCR1034
CHECK R1045.
R1046.R1036,
R1033 AND C1033
(FEED BACK OF
OUTPUT V0LTA6E)
CHECK T1020
AND T1050
TR0UBLESH00TU1030'S
SUPPLY CIRCUIT.
CHECK 01021 AND
CR1023 FOR OPENS
YES
CONNECT THE + OUTPUT
OF THE SECOND PS503
TO J2318-1 AND THE
-OUTPUT TO J231B-2.
CONNECT THE COMMON
TO THE CATHODE OF
CR1064
TURN BOTH VOLTAGES
TO MAXIMUM AND SET
CURRENT LIMIT TD 200mA
TURN THE FIRST
PS503UPTO
28V AND BACK
TO 16V AS
DONE EARLIER
TROUBLESHOOT
U1062.U1064,
U1066. AND
ASSOCIATED
COMPONENTS
"ii
REPLACE
FAULTY
COMPONENT
CHECK
R1034AND
R1037