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Figure 4 - BPA-125 Rear Panel Connection Diagram

THERMAL BREAKER.

 If the thermal breaker opens, there will be

no audio output; however, the power switch lamp will remain illu-
minated. Wait approximately two minutes for the breaker to reset. If
it resets and then opens again, investigate the cause of the
temperature overload. This may be due to improper connections at
the output terminals or to excessive environmental heat with inade-
quate ventilation. The thermal breaker will open when the
temperature at the output transistor heat sink reaches 105 °C.

CIRCUlT BREAKER.

If the AC circuit breaker opens, the power

switch lamp wiIl go out and the amplifier will have no output;
however, there will be power at the AUX POWER receptacle on the
rear panel. Set the POWER switch to OFF and momentarily depress
the red button on the circuit breaker to reset it. Return the POWER
switch to ON. If the circuit breaker trips again, do not attempt to
reset it; have the trouble investigated by a qualified technician.

MAINTENANCE

CAUTION

There are no user-serviceable parts within the

amplifier. Have all internal servicing performed by a
qualifed technician. The warranty will become void if
repairs are made by other than the Bogen Service
Department or authorized service agency.

BOGEN  SERVICE

Our Service Department is interested in the maintenance of

your Bogen equipment. If trouble ever develops, do not hesitate
to ask our advice or assistance. Information may be obtained by
writing to: Service Department, Bogen Division, P.O. Box 500,
Paramus, N.J. 07653.

When communicating with us, give the model and series

designation of your unit. Describe the difficulty and include
details on the electrical connections to associated equipment,
such as preamplifiers, speakers, etc. We will send you service in-
formation if the trouble appears simple. If the amplifier requires
servicing, we will send you the name and address of the nearest
authorized Bogen service agency.

When shipping the amplifier, pack it well, using the original

shipping carton or similar container and filler material to prevent
damage in transit. 

Remove any plug-in transformer from the

printed circuit board beforeshipping. 

Send the unit, fully insured

and freight prepaid via UPS or other responsible carrier. The
repaired unit may be picked up by you personally or will be
returned to you freight prepaid while in warranty.

REPLACING COMPONENTS

All semiconductor components on the printed circuit board

are soldered in place to ensure maximum reliability. When
soldering or unsoldering transistors and diodes, use a heat sink
(such as a small alligator clip) between the source of heat and the
component. When replacing driver and output transistors, be
certain to install the case/heat sink insulator, after lightly coating
both sides with a thermal conducting compound (such as Dow
Corning No. 340, or equivalent).

R E P L A C E M E N T   P A R T S

Most components used in the amplifier are standard parts

available through reputable parts suppliers. The parts listed here
may be obtained through Bogen distributors, service agencies or
directly from the factory. When ordering a part, specify the part
number and the description, as listed. Specify the model of the
unit and give the series designation, which is a letter followed by
numbers, located on the rear panel. For parts on the circuit
board, also give the component board assembly number, which
begins with “45”.

Summary of Contents for BPA-125

Page 1: ......

Page 2: ...Illuminated Power Switch Input Level Control Circuit Breaker Reset Switch Lo Cut Filter Switch 18OW 360w Overload Protection I 1 AC Circuit Breaker Thermal Circuit Breaker Transient Protection Diodes 1 Auxiliary Receptacle not switched Dimensions Three wire grounded 300 watts maximum 15 25 Wx8 Dx3 5 H 15 25 Wx8 Dx5 25 H 38 7 x 20 3 x 8 9 cm 38 7 x 20 3 x 13 3 cm Finish I Black Weight Rack Panel Br...

Page 3: ......

Page 4: ...ly to the output terminal strip on the rear panel Connect one speaker lead to the COM terminal and the other to the terminal corresponding to the impedance of the speaker system If the load impedance falls between two output ter minal values use the terminal of lower impedance Total power distribution to the speakers should not be greater than the power rating of the amplifier For balanced output ...

Page 5: ...designation of your unit Describe the difficulty and include details on the electrical connections to associated equipment such as preamplifiers speakers etc We will send you service in formation if the trouble appears simple If the amplifier requires servicing we will send you the name and address of the nearest authorized Bogen service agency When shipping the amplifier pack it well using the or...

Page 6: ... Cap Elect 8800 µF 75V BPA 125 79 118 006 Cap Elect 5000 µ F 50V BPA 60 79 509 056 Cap Elect 6000 µ F 75V BPA 60 Schematic Designation Part Number CBlOl 94 0023 10 CB102 94 0014 07 CB201 94 0023 05 CR101 96 5373 01 CR201 204 96 5241 01 QlOl 96 5213 01 4102 103 96 5385 01 Q104 107 96 5385 01 R101 102 R103 106 76 114 107 76 l 14 102 R107 75 154 182 R109 R201 203 75 742 101 76 l 14 102 R202 75 154 13...

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