HP 3490A - Page 184

It{G @R-
SET S/H SAYITCH
TO TFACK/HOLD,
FUNCTION
TO DC,
RAilGE
?O
lOV.
A2'K1 SHOTJLO 8E CLOSEO.
SET SAM-
PLE
RATE
FULLY CLOCKS'ISE.
APPLY
10 v& tNruT-
MLY
FULLAANGE
INR
T
Ot'l
ALL
RANGES
IN
SOTH
TRACK/HOLD
ANO
ACOUIRE/HOLO
OPERATION'
CHECK
VOLTAGE
AT PIN
'
NEAN
TOP
CENTER
OF A2'.
SHOULO SE NEAR
ZERO.
CH€CK WAVEFORiilI
AT PINS
2
AND
3 IN
SATE
U)CA?ION. EXTER.
NALLY
TRIGGEB
SCOF€ Oil T€ST
?otNT
x tN Loctc
sEcTtoN oF
3!90A
MAIN
CIRC-I'IT
8OAFO.
SHOULO AE:
PtN
2
+45
V
HHoA
.l
U
Lov
PtN
3
+45
V
HHoE
J ll L_
0V
SET S/H S:II,ITCH
OFF,
SAMPLE
RA?E
FULLY CLOCKWISE,
RANGE
IO 1 V.
SHORT II{PUT TERMINAI.s.
Cor{ilECT
TEST POINT
LTST ON
A28 TO INGUARD
GROUND.
THEN
SET 6VH
S1INTCH TO
TRACK/HOLD
OR
ACOUIRE/HOI'.
ffECK
VOLTAGE
AT A27TPI.
YES
SELECT
IOV
RANGE.
TF
CHECK
IINEARIW 8Y A'
PUTS
OF r V.3V,6
V,7
V A
IS
VOLTAGE
OßIFTING
T(
lOmV/.?
VOLTAGE
LESS
TH/
i
12 V
ANO DRIFTII{G
I
TROUBLESHOOT
AIPUFI€
rn,@t.
SET
S/H
SiWIYCH TO ol
tvavEFonMs
aTP|l{s
t,2 l
EXTERNALLY
TRIGGER
TEST POINT
K IN LOGIC
S
3,l9OA
MAIN
CIRCUIT
BOAR
SHOULO
gE:
.F;t
F;;L
Jha^
F*;l__
PIN
2
HMOA
PIN
I
HMDS
PIN
3
HMOC
IF WAVEFORMS
ARE NOT
A28UT4
IS
PROSASLY
DEFE
'E
AFPLY
TO
OPNOß
(@Hz
UN€l. FOR
ASE nilES BY m *"
SET
S/H SIVITCH
TO
TRACK.IHOLO
OR
ACOUIRE/HOLD. S€L€CT
l0 V RAtrlGE.
APPLY
tovdc lNPUt.
S€T SAPLE
RATE
FULLY CLOCKITIS€.
A27KI
sltoulD 8€
cLosEo.
TROUEL€sHOOT
A27X2
ANO ORIVE
ctRcutTs
tN
A27Ut0.
REMOVE
A27 ANO
A2A. REPLACE
IVIIH
JUMP€R
AOARDS
A24 AND
A25. SET
S/H
SI\'ITCH
TO OFF.
CHECK OC
OPER-
ATION.
T A27, A?a. MAKC
SURE
TO
CABLES
CORRECTLY.
GO
TO
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