Tektronix 2467B - Page 466

2465B/2467B Service
READOUT TROUBLESHOOTING PROCEDURE
READOUT*
TROUBLESHOOTING
PROCEDURE
DATA PATH
BDO (P411-1S)
THROU6H U2960 AHD
U2860 TO ROOD
IP411-10 IS BAD
PRESS UP ON THE
TRIB6ER SOURCE
SWITCH TO START
LOOPINS OF
DIAGNOSTIC
CHECK:
U2960-3 IS
PULSING LO.
U2860-12 IS
PULSING HI.
U2960-2 "1
U2960-9 I
A
CTIVE
U2960-18f
U2960-8 )
CURSOR
CONTROL
PROBLEM
PRESS UP ON THE
TRIGGER SOURCE
SWITCH TO START
LOOPING OF
DIAGNOSTIC
RA6,CA6,CURSORO
QRDLY REF1
IS STUCK
CHECK:
U2B65-1
PULSES
HI
U2865-3
U2860-3
U2960-3
U2920-27
U2865-2,
5.6,7,11
AND 12
U2860-1.2
U2960-4,
6,7,9,10,
11,12,13,
14 AND 15
U2935-1.19
U2920-20 PULSES
HI, BUT IS LO AT
SAME TIME AS
U2920-27
PULSES
LO
\ ACTIVE
PROBLEM IN
AREA0FU2810
OR U2900
PROBLEM WITH
CURSORO
DLTREF1,
U280OOR
U2805
CHECK U2B30A
ANDU2830B
FOR PARTIAL
FAILURE
s^ IS \.
nicot k v ^*N-
DISPLAY ^\
u
BRIBHT DURING >
lt0
».
H0LD0FF7 ^^
ITES
CHECK PATH:
U298S-12
1)2990-5,6
U2B80-12 AND
U2880-8,
CHECKIN6
U2880-11 FOR
ACTIVITY AND
U2B80-13F0R
A HI
OFF DURING
SLOW SWEEP
"
CHECK PATH:
U2985-14
U2835-9
U2965-1
U2965-4
U2950-2
AND U2950-6
CHECKING
U2950-3 FOR
ACTIVITY AND
U29S0-1 FOR
A HI
READOUT
6AIN
CURSORS?.
YES
NO
PROBLEM IN
AREA OF
U2800.U2805,
U2810.U2820,
0RU2900
ADJUST
R.O. GAIN
AND CENTERING
R2918, R2931
CHECK:
R2903.R2904,
R2905.R2906,
R2907.R291B,
R2919.R2920,
R2921.R2922,
R2923.R2924,
R292S,R2926,
R2927.R292B,
R2929.R2930,
R2931.R2932,
R2933.R2934.
R293S.AND
AND R.O. INPUTS
ON MAIN BOARD
CHECK:
R290B.R2909,
R2910, R2911.
R2913, R2914.
R2915. R2916.
R2917AND
R.O. INPUTS
ON MAIN BOARD
CALIBRATION
DF AV
CURSORS IS
WRONG
PROBLEM IN
AREA OF
U2800-1,2,3,4,S
Sam
2
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goo
gmo
S^e
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R» O
> <=
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£
w
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o
o
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0
TROUBLESHOOT
INDICATED
FAULT
' RETURN'
TO