Duncan 84-40, Руководство пользователя

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TROUBLESHOOTING
The following chart should help isolate some common problems you may encounter with your
amplifier. Some are obvious problems you can remedy you, but remember, THERE ARE NO
USER SERVICEABLE PARTS INSIDE THE AMP. If you cannot identify the cause of the problem
using the chart, or if it indicates your amplifier to be defective and in need of repair, return the unit
to an authorized Seymour Duncan Service Center, or call (805) 964-9610 for a Return
Authorization number. No units will be accepted by Seymour Duncan without an RA number.
Symptom Cause Remedy
Amplifier does not come on
when power switch is “on” 1. Power not connected 1. Ensure power cord is
plugged in
2. Blown amp fuse 2. Check amp fuse; replace
with appropriate value fuse
1A/250 V for 220V & 240V
operation
2A/250V for 1OOV & 120V
operation
3. No source voltage 3. Verify power source with
something you know works
4. Defective on/off power
switch 4. Return unit to authorized
service center
No sound coming from
speakers; no audible hum
from amplifier, but LED's are
on 1. Master volume and/or
overdrive control set too low 1. Increase control settings
2. Speaker output jack not
connected 2. Connect speaker to 4 ohm
or 8 ohm output
3. Defective speaker or cable 3. Verify if speakers operate
properly by using another amp
4. Volume controls on
instrument down 4. Increase instrument settings
Distorted sound from one or
both channels at low volumes 1. Overdrive control set too
high 1. Reduce control level
2. Worn tubes 2. See maintenance and tube
chart section
No reverb 1. Reverb control set too low 1. Increase control level
2. Reverb output wires not
connected to send/return
inputs or connected
backwards 2. Ensure reverb output wires
properly connected
3. Defective spring 3. Refer to authorized service
center
4. Defective send/return
circuits 4. Refer to authorized service
center
Amp does not switch channels 1. Defective footswitch 1. Replace footswitch
2. Defective manual channel
switching switch 2. Refer to authorized service
center
3. Defective internal channel
switching circuit 3. Refer to authorized service
center