Sharp PC-7200 Service Manual page 37

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P C-7200
3) Troubleshooting guides
d) When -5V output was down.
--FR~.~air""e"I8-i>e-peFf"'ffleG-iR ....... raiRg.to-fQllowJng.:r""""looholot._----f==;;;::;~~==':;:::;::;:::::::::===~-,,=,-------
ing flow chart. Check DC voltage between Good.
3-B) Troubleshooting flow chart
a)When all outputs were down.
120 Vec. GClOd
a,24OVac
Choclc DC .ohag" between
Cl0AB+ end C10A/l-.
o,Cl09+ oodC10A-.
158 Vdc. Good
or312Vdc.
Replacement 01 new TAl,Tf\2, CAl,
b) When +12V output was down.
+
12V
output was
down.
Nagood.
Good.
Replacement of eN3, 4, 5, 9.
Replacement of DS2 or DS3 or le7.
c) When +5V output was gone low voltage or high voltage.
Adjust +5V output voltage by VR1.
+5V
output is not
changed.
RepiacementofPC1 arlC.
2-31
C20+ and C20-.
Nagood.
Replacement of IC1.
Replacement of D5.
e) When -12V output was down.
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Check DC voltage between
11-______ _
C22+ and C22-.
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Good.
No good.
r
Replacement of IC2.
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Replacement of 06.
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f) When -15V output was down.
I
Check DC voltage between
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C22+ and C22-.
Ir-------.,
Good.
No good.
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Replacement of 1C3. .
~
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Replacement of 06.
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g) When ACL output was down.
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Check +5V output voltage.
1
lowerthan4.6V.
higher than 4.6V.
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Set +5V output voltage at 5.0V . . :
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Replacement of IC4.
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