Troubleshooting; Care And Cleaning - B&K ST2140 Owner's Manual

PROBLEM
No sound
('on' LED not illuminated)
No sound on some or all
selected channels ('on'
LED illuminated)
Sound lacks direction,
bass weak
Loud hum or buzz on one
or more channels
Low output from amplifier
Channel sounds distorted
and low in output
** Note :
If unit continues to blow power inlet fuses,
FUSE!!,
have it serviced
Under normal use, the amplifier will not require any special care. Over time you may
wish to clean the exterior of the unit by wiping it with a damp cloth to remove any dirt or
dust that accumulates on it. Do not let any liquid enter the amplifier thru the vents in the
top cover. You may clean the connectors on the rear panel with isopropyl alcohol
annually.

Troubleshooting

POSSIBLE CAUSE
1. Power cord not plugged in.
2. Power off at AC source.
3. AC power inlet fuse blown
or faulty.
4. Control switch in the wrong
position.
1. Speaker leads loose or
faulty.
2. Line stage to amp. cables
loose. or faulty.
3. Source to line stage cables
loose or faulty.
4. Line stage or source not
correctly selected.
1. Speakers connected out of
phase.
1. Poor ground connection in
interconnect cables.
1. Balanced switch in
balanced mode when using
unbalanced inputs.
1. Blown rail fuse.
.

Care and cleaning

Page 11
POSSIBLE SOLUTION
1. Reconnect power cord.
2. Check AC switch or fuse.
3. Check for shorts or
overloading.
4. Place control switch in
proper position. (Page 5)
1. Tighten, repair, or
replace cable.
2. Tighten, repair or replace
cable.
3. Tighten, repair or replace
cable.
4. Check all switch settings.
1. Check connections
making sure that cables
are connected (+) to (+)
and (-) to (-).
1. Check all connectors and
repair as necessary.
1. Put balanced switch in
correct position.
1. Replace blown rail fuse
inside amplifier.
DO NOT USE A HEAVIER
12998 rev 0004