The Amp Shuts Down Unexpectedly - Chubster 40 And R30-112; The Amp Shuts Down Unexpectedly - R55-112, Chubster 55, Suprema; The Amp Shuts Down Unexpectedly - R100-212; There's Unwanted Distortion - Rivera R100-212A Owner's Manual

3. Check the Standby switch.
4. If an effect or signal processor is plugged into the Effects Loop, make sure it's turned
on and that the level controls on the amp and processor are set correctly.
5. Check the speaker cable or cables to see if they are disconnected or shorted.
6. Check for blown speakers.
7. If a fuse is blown, replace it (if it blows again, refer your amp to qualified service
personnel).

The amp shuts down unexpectedly - Chubster 40 and R30-112

1. Follow the seven steps in the "There's no sound" section. 2. Turn off the amp and
wait 25 minutes before turning it on again. An internal thermal protection circuit can shut
the amp down if it becomes overheated. 3. After 25 minutes, turn it on, and if it shuts
down again an internal fuse may be blown (it is a T 1A 250 Volt Slo-Blo type, 5mm x
20mm). When this fuse blows, it indicates a short in an output tube. If this fuse is blown,
refer the amp to qualified service personnel.
Note: On SEMKO 230-volt models, there is an additional T 8A (250 Volt Slo-Blo type,
5mm x 20mm) fuse located internally.

The amp shuts down unexpectedly - R55-112, Chubster 55, Suprema

1. Follow the seven steps in the "There's no sound" section. 2. Turn off the amp and
wait 25 minutes before turning it on again. An internal thermal protection circuit can shut
the amp down if it becomes overheated. 3. After 25 minutes, turn it on, and if it shuts
down again, refer the amp to qualified service personnel.
Note: On SEMKO 230-volt models, there is one additional T 8A (250 Volt Slo-Blo type,
5mm x 20mm) fuse and two T 1A (250 Volt Slo-Blo type, 5mm x 20mm) fuses located
internally. These should only be replaced by qualified service personnel.

The amp shuts down unexpectedly - R100-212

1. Follow the seven steps in the "There's no sound" section.
2. Turn off the amp and wait 25 minutes before turning it on again. An internal thermal
protection circuit can shut the amp down if it becomes overheated.
3. After 25 minutes, turn it on, and if it shuts down again, refer the amp to qualified
service personnel.
Note: On SEMKO 230-volt models, there are two additional T 1.6A (250-volt Slo-
Blo type, 5mm x 20mm) fuses and one T 10A (250-volt Slo-Blo type, 5mm x
20mm) fuse located internally. These protect the amp's output tube filaments and
should only be replaced by qualified service personnel.

There's unwanted distortion

1. Check the speaker.
2. Check the cables.
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