Duncan Convertible 2000 Руководство пользователя - Страница 16
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Печатать страницуTrouble Shooting
The following table should enable you with little or no knowledge of electronics, to isolate the
cause of some' problems you may experience with your amplifier and the steps required for
repair. Most causes of impaired amplifier performance are due to minor problems or irregularities,
which can be easily corrected by you.
However, if you cannot identify the cause of the problem using the table below, 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.
Symptom
Amplifier does not come on
when Power Switch is "On."
No sound coming from
speaker(s), (No audible
amplifier hum).
No sound coming from
speakers.
Loud amplifier hum.
Probable Cause
1. Power not connected.
2. Blown amp fuse.
3. No source voltage.
4. Defective On/Off power
switch.
1. Modules not installed.
2. Quick Access module cover
is not installed on top of amp.
3. Amplifier in standby (up)
position.
4. Master Volume and/or
Overdrive control levels set
too low.
5. Speaker output plug
disconnected " output wires
shorted.
6. Instrument pickup/
electronics may be defective.
7. Defective speakers
8. Volume controls on your
instrument are down.
9. Defective center driver tube
12AX7.
10. Defective 5U4GB rectifier
power tube.
1. Amplifier A.C. polarity.
2. Instrument connecting cable
not properly grounded
3. EL-34 power tube shorted.
Remedy
1. Ensure power cord is
plugged into power outlet.
2. Check amp fuse; replace if
blown with 250 VAC 5Amp
SLO-BLOW.
3. Verify power source with
something you know works.
4. Return unit to dealer or
factory for repair
1. Install modules.
(See page 3.)
2. Install Quick Access module
and allow amp to warm up for
one minute.
3. Place standby switch in
"On".
4. Increase control level
settings to "2" and listen.
5. Connect output plug to 4
ohm, 8 ohm or Variable
Damping input.
6. Unplug cable from
instrument and touch tip of
plug; if hum is heard, replace
instrument with one known to
operate properly.
7. Verify speakers operate
properly using another amp.
8. Increase settings and listen.
9. Replace 12AX7
10. Replace tube.
1. Reverse position of power
"on" switch.
2. See that connecting cable is
plugged into instrument.
3. Replace EL-34.