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Trouble
Check method
Check result
Cause
Corrective action
Battery is abnormal or depleted.
Charge the battery or replace it with a normal battery.
Power can be turned on by
both methods (i) and (ii).
AC-Adapter
[501]
is abnormal.
Replace AC-Adapter
[501]
with a new one.
(i) Set a normally charged battery in the UR
18DSL, and check whether power can be
turned on.
Power cannot be turned on by
both methods (i) and (ii).
Go to the next check.
Go to check method (1)-(iii).
(ii) Connect AC-Adapter
[501]
to the UR 18DSL,
and check whether power can be turned on.
Power can be turned on by
either method (i) or (ii).
Terminal Ass'y
[65]
is abnormal.
Replace Terminal Ass'y
[65]
.
Some connectors are
disconnected.
Same as on the left.
Connect the disconnected connectors.
(iii) Disassemble the UR 18DSL, and then check
whether all connectors are properly
connected.
All connectors are properly
connected.
Go to the next check.
Go to check method (1)-(iv).
Measured voltages are nearly
the same as those on battery
and AC Adapter.
Control PCBA
[17]
and Function
PCBA
[21]
are abnormal.
Replace Control PCBA
[17]
and Function PCBA
[21]
.
(iv) Set the battery and check voltage at the 3-pin
connectors. * Perform the same check on the
red (+) and blue (-) pins to connect the AC
Adapter.
Voltage cannot be measured. Go to the next check.
Go to check method (1)-(v).
Fuse (250V-2A)
[64]
is blown. Same as on the left.
Replace Fuse (250V-2A)
[64]
.
(v) Check whether Fuse (250V-2A)
[64]
is blown.
Fuse (250V-2A)
[64]
is not
blown.
Go to the next check.
Go to check method (1)-(vi).
Power can be turned on.
Terminal Ass'y
[65]
is abnormal.
(Replace Terminal Ass'y
[65]
.)
(1) Power
cannot be
turned on.
(vi) Replace Terminal Ass'y
[65]
, and then check
whether power can be turned on.
Power cannot be turned on.
Control PCBA
[17]
and Function
PCBA
[21]
are abnormal.
Replace Control PCBA
[17]
and Function PCBA
[21]
.
Abnormal noise is produced
when turning the dial.
Control PCBA
[17]
and Function
PCBA
[21]
are abnormal.
Replace Control PCBA
[17]
and Function PCBA
[21]
.
(i) Turn the volume dial.
Neither noise nor sound is
produced.
Go to the next check.
Go to check method (2)-(ii).
Some connectors are
disconnected.
Same as on the left.
Connect the disconnected connectors.
(ii) Disassemble the UR 18DSL, and then check
whether all connectors are properly
connected.
All connectors are properly
connected.
Go to the next check.
Go to check method (2)-(iii), or replace Jack
[68]
.
Measured resistance is about
8
ȍ
(normal value).
Go to the next check.
Go to check method (2)-(iv).
(iii) Measure speaker resistance with multimeter.
Measured resistance largely
deviates from 8
ȍ
.
Speakers are abnormal.
Replace Front Housing Ass'y
[8]
.
Some lead wires are broken.
Some lead wires are broken.
Replace broken lead wires.
(2) No sound
is output.
(iv) Use multimeter to check whether any lead
wires are broken.
No lead wire is broken.
Control PCBA
[17]
and Function
PCBA
[21]
are abnormal.
Replace Control PCBA
[17]
and Function PCBA
[21]
.
TROBLE SHOOTING GUIDE
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