HP (Hewlett-Packard) 3490A Car Stereo System User Manual


 
vtEwEo
FROM
ToP
'.@J'"@i":@
@^
3Rr3
l.
v
R2
?6.7K
c2l
55
C/ LF
'r---\-
-7-
ov
,---t
V
TPI
ON IV
RANGL
-8.3V
ov
3.5V
P
AT IV RMS
ON
lv
RANGET
c23
68
FILTER
NOTE 6
R43
t5.4 K
NOTES'
l.
lF loOV,2OHr lS
oUT
OF SPEC,CHECK
Cl.
2.
lF IOoOV
loov AT IOKH! lS
oUT
OF SPEo,
CHECK C2.
3.
lF lV, IOKHZ
lS H|GH, CttECK C3.
4.
CHECK LI.4 FOR
PROPER SEAT ON
BOARD.
IF
REED IS
SUSPECTED.
TAKE
OFF
AND
MEASURE
WINDING
FOR 2OO.3OO
OHMS.
CAREFULLY SOUEEZE
AND ALIGN CONTACTS
BEFORE
REPLACING
WINOING.
IF
REPLACING
REED.
USE CLEAN HANOLING.
5. LEAKY
CR5-12 CAN CAUSE
HIGH FREOUENC/
CALIBRATION ERRORS.
6.
07
AND
09 CAN CAUSE ERRORS
IF LEAKY.
R44
4t].7 K
9l
nc
corvepreR
ourPUT
1
TO A2
V
R25
3.OlK
o.82
+ t7v
+r7v
t
12
Figwe
7-29. Schematic
Diagram,
AC
Converter,
A6.
1-s7l7-s8