Rato R5500, Service Manual

Page: 66 / 71

3. TROUBLESHOOTING
64
Ser. No.
Multimeter Black/Red
Meter Pen Contacting
point
Tested
parts
Multimeter pointing Judgment
1
The Black to“—”,
The Red to “a”
Part
1
Meter needle waves clockwise, the
resistance value is clock to zero.
Positive
continuity
Normal
The Black to ”a”
，
The Red to “—”
Meter needle is quiet, the
resistance value is infinite.
Not continuity
The Black to“—”,
The Red to “a”
Meter needle is quiet, the
resistance value is infinite.
Not continuity Open circuit
The Black to ”a”
，
The Red to “—”
Meter needle waves clockwise, the
resistance value is clock to zero.
Continuity Open circuit
2
The Black to ”a”
，
The Red to “+”
Part
2
Meter needle waves clockwise, the
resistance value is clock to zero.
Positive
continuity
Normal
The Black to “+”
，
The Red to a
Meter needle is quiet, the
resistance value is infinite.
Not continuity
The Black to ”a”
，
The Red to “+”
Meter needle is quiet, the
resistance value is infinite.
Not continuity Open circuit
The Black to “+”
，
The Red to a
Meter needle waves clockwise, the
resistance value is clock to zero.
Continuity Open circuit
3
The same as the No. 1
，
point b instead of a
Part
3
The multimeter needle indication and judgment is the same as the
No.1.
4
The same as the No.2
，
point “b “ instead of “a”
Part
4
The multimeter needle indication and judgment is the same as the
No.2.