Tektronix 2467B - Page 464

2465B/2467B Service
PRESS
BEAM FIND
PUSH
SEC/DIV
KNOB IN,
PRESS
AUTO
PUSH
AUTO
BUTTON
YES
SWEEP TOUBLESHOOTING PROCEDURE
REPAIR PATH
FROM U700-4S
TO U950-4
REMOVE
U700
REPAIR
LED
REPAIR RAMP SIGNAL
PATH. CHECK U700,
U735, UBOO, AND INT-
ERCONNECTIONS, POWER
SUPPLIES AND CONTROL
SIGNALS TO UBOO
(HSA, HSB, AND POS)
REPAIR
-1.25V
REFERENCE
PATH
REPAIR
FAULTY
SUPPLY
REPLACE
U700
(TRY SUBSTITUTING U900)
REPAIR
INDICATED
FAULT
REINSTALL
U700
REPAIR
HOLDOFF-TIMING
CURRENT SOURCE
REPAIR
SG SIGNAL PATH
REPAIR
OPTION CIRCUIT
CONNECTED TO
J102-5
CHECK HOLDOFF
CURRENT SOURCE
AND HOLDOFF
RESET Q155,
Q157, Q159,
Q160, U16BA,
U169A,U169F
PULL S6A LOW WITH
A STRAP TO GNDFROM
U975-22 TEMPORARILY
REPAIR HOLDOFF
COMPARATOR, CHECK
U168B. Q158, Q161
TEMPORARILY
CONNECT A 10KO
RESISTOR FROM
U650-10T0+5V
REPLACE U700
TRY
SUBSTITUTING
U900
+3.56V IS MEASURED AS -1.44V
WITH RESPECT TO THE +5V SUPPLY
REPLACE
U700
JEPAIR
CC OR CD
TO U500
OR REPLACE
U500
YES
REPLACE
0155
NO
CHECK OR
REPLACE
U975
U650
TROUBLESHOOT
FAILING
CIRCUIT
CHECK
U975 0R
U985
YES
DISCONNECT
P411
REPAIR SGA ON
READOUT BD A5
CHECK U2880
AND U2885
REMOVE CABLE
0NJ104IF AN
OPTION 6 OR 9
IS INSTALLED
YES
REPAIR SGA PATH
ON OPTION
6 OR 9 BD
NO
REPAIR
SIGNAL PATH
(0
w
5£
gm
§H
8=0
og?
™8
Z
Q
©
6863-46