270241 Service Manual
Index
2
2
3
3
4
5
5
7
8
9
10
Technical Specifications
AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Schematic Diagrams
AV12-4, AV12-8, AV15-4, AV15-8, AV15S Passive Versions Spare Part List
AV12A, AV15A, AV15SA Block Diagrams
AV12A Test Procedures & Adjustment
AV15A Test Procedures & Adjustment
AV15SA Test Procedures & Adjustment
AV12A Schematic Diagram
AV15A Schematic Diagram
AV15SA Schematic Diagram
AV12A, AV15A, AV15SA Active Version Spare Part List
Warnings
SERVICE MANUAL
Notice
Service must be carried out by qualified personnel only.Any tampering carried out by unqualified personnel during the guarantee period
will forfeit the right to guarantee.
For a correct operation of the instrument, after having switched off, be careful to wait at least 3 seconds before switching on again.
To improve the device's specifications, the schematic diagrams may be subject to change without prior notice.
All components marked by this symbol have special safety characteristics, when replacing any of these components use only
manufacturer's specified parts.
The (µ) micro symbol of capacitance value is substituted by U.
The (Ω) omega symbol of resistance value is substituted by E.
The electrolytic capacitors are 25Vdc rated voltage unless otherwise specified.
All resistors are 1/8Ω unless otherwise specified.
All switches shown in the "OFF" position. All DC voltages measured to ground with a voltmeter 20KOhm/V.
Soldering point.
Supply voltage.
Logic supply ground.
Male connector.
Test point.
Analog supply ground.
Female connector.
M/F faston connector.
Flag joined with one or more flags
Chassis ground.
with the same signal name inscribed.
Earth ground.
ATTENTION
Observe precautions when handling electrostatic sensitive devices.
Address
L CODE: 270241 M
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. 0541/959511 - fax 0541/957404
GENERALMUSIC on the NET: http://www.generalmusic.com
1J
AVALON TECHNICAL SPECIFICATIONS
AV-12
AV-15
LOUDSPEAKER SPECIFICATIONS
AV-15S
High
1" tweeter with phasing 1" compression driver
plug and EWT horn
with EWT horn
Low
12" woofer
15" woofer
15" woofer
W continuous
200
350
350
W peak
400
600
600
Ohms
4/8
4/8
4
5 kHz
2,6 kHz
200 Hz
8 Ω: 6 / 12 dB/oct.
8 Ω: 6 / 12 dB/oct.
Hz
12 / 6 dB/oct.
4 Ω: 0 / 12 dB/oct.
4 Ω: 12 / 18 dB/oct.
4-way SPEAKON + JACK (input + link)
High density polyetylene enclosure + polyetylenic foam
Protection metal grid
mm (WxHxD)
436x616x420
500x706x490
500x706x490
kg
15 / 18,5
20 / 26
18,5 / 24,5
COMPONENTS
POWER HANDLING
(EIA RS-426A)
IMPEDANCE
PASSIVE CROSSOVER
CONNECTIONS (passive versions)
CONSTRUCTION
DIMENSIONS
WEIGHT (passive / active)
AMPLIFIER SPECIFICATIONS (active versions)
EIA OUTPUT POWER
(1kHz, max THD 1%)
POTENZA D’USCITA IHF
(Tone burst 10% 20 ms
Max THD 0,1%)
INPUT SENSITIVITY
INPUT IMPEDANCE
ACTIVE CROSSOVER
DISTORSION
CONTROLS
DISPLAY
W
180
300
300
W
200
350
350
dB (V)
kohms
Hz
%
CONNECTIONS
POWER SUPPLY
0 (0.775V)
30 (balanced) - 15 (unbalanced)
From 80 to 320 @ 12db/oct.
<0.02 (THD+Noise)
Volume - Shield on/off - XOVER frequency (AV-15SA)
SIGNAL/LIMIT LED - ON LED
COMBO + XLR-M (input)
COMBO + XLR-M (input + link)
XLR-M (output)
See label on the apparatus
SYSTEM SPECIFICATIONS
SENSITIVITY (SPL 1W/1m)
MAX SPL continuous
MAX SPL peak
FREQUENCY RESPONSE
DISPERSION (OxV)
NOTE:
dB
dB
dB
Hz (-10dB)
97
120
123
70-20000
60x40
* Measured with the anti-clipping circuit off.
99
124
127
60-20000
60x40
97
122
125
50-200
Transistor Packages
TO92
BC550, BC560:
TO126
MJE340, MJE350,
TO220
TO218
MJE15030,MJE15031: TIP35C,TIP36C,
1=Collector
MJE802:
1=Base
MJE4342, MJE4352:
MJL21194:
2=Base
1=Emitter
2=Collector
1=Base
1=Base
3=Emitter
2=Collector
3=Emitter
2=Collector
2=Collector
2N5401, 2N5550
3=Base
4=Collector
3=Emitter
3=Emitter
1=Emitter
4=Collector
4=Collector
4=Collector
2=Base
3=Collector
J2
TO264
MJL21193,
Spare Part List (PASSIVE VERSIONS)
Code
Description
Accessories
277334
Owner’s Manual
AV-12 4 Ohm
778112
727601
778144
141200
140193
768202
667692
667702
667700
657270
657267
229037
227056
Cables Assembly
Inputs Panel Assembly AV-12/4 Ohm
*
Jack-Speakon Cables Assembly
**
Speakon Socket (NL4MP Neutrik)
**
Jack Mono Socket
*
Crossover Filter Board (Pcb#313063) AV-12/4 Ohm
*
Rear Panel AV-12/4 Ohm
Handle
Grid
EWT(TM) Elliptical Horn
Box
1" 4ohm Horn Tweeter
12" 4ohm Woofer Speaker
210242
210217
210215
210211
120964
120148
120147
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Gasket between Tweeter and Horn
M4i M5e x17.5mm Threaded Pin for Woofer
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
AV-12 8 Ohm
778112
727602
778144
141200
140193
768203
667693
667702
667700
657270
657267
229038
227057
Cables Assembly
Inputs Panel Assembly AV-12/8 OHM
*
Jack-Speakon Cables Assembly
**
Speakon Socket (NL4MP Neutrik)
**
Jack Mono Socket
*
Crossover Filter Board (Pcb#313063) AV-12/8 Ohm
*
Rear Panel AV-12/8 Ohm
Handle
Grid
EWT(TM) Elliptical Horn
Box
1" 8ohm Horn Tweeter
12" 8ohm Woofer Speaker
210242
210217
210215
210211
120964
120148
120147
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Gasket between Tweeter and Horn
M4i M5e x17.5mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
227059
210242
210217
210215
210211
120965
120148
120147
15" 8ohm Woofer Speaker
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Gasket between Tweeter and Horn
M4i M5e x24mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
AV-15S 4 Ohm
841208
727605
778144
141200
140193
768206
667696
667703
667701
657269
347393
227060
Cables Assembly
Inputs Panel Assembly AV-15S/4 Ohm
*
Jack-Speakon Cables Assembly
**
Speakon Socket (NL4MP Neutrik)
**
Jack Mono Socket
*
Crossover Filter Board (Pcb#313064) AV-15S/4 Ohm
*
Rear Panel AV-15S/4 Ohm
Handle
Grid
Box
Threaded Clog (to steady on the floor)
15" 4ohm Woofer Speaker
210242
210217
210215
177721
120965
120148
120147
667704
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Fixing Plate (to fix the Floor Bracket)
M4i M5e x24mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
Floor Bracket with Threaded Knobs
AV-15 4 Ohm
778112
727603
778144
141200
140193
768204
667694
667703
667701
657270
657268
229036
227058
Cables Assembly
Inputs Panel Assembly AV-15/4 Ohm
*
Jack-Speakon Cables Assembly
**
Speakon Socket (NL4MP Neutrik)
**
Jack Mono Socket
*
Crossover Filter Board (Pcb#313062) AV-15/4 Ohm
*
Rear Panel AV-15/4 Ohm
Handle
Grid
EWT(TM) Elliptical Horn
Box
1" 8ohm Horn Compression Driver
15" 4ohm Woofer Speaker
210242
210217
210215
210211
120965
120148
120147
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Gasket between Tweeter and Horn
M4i M5e x24mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
AV-15 8 Ohm
727604
778144
141200
140193
768205
667695
667703
667701
657270
657268
229036
Inputs Panel Assembly AV-15/4 Ohm
*
Jack-Speakon Cables Assembly
**
Speakon Socket (NL4MP Neutrik)
**
Jack Mono Socket
Crossover Filter Board (Pcb#313065) AV-15/8 Ohm
*
*
Rear Panel AV-15/8 Ohm
Handle
Grid
EWT(TM) Elliptical Horn
Box
1" 8ohm Horn Compression Driver
Note:
Each spare part is single quantity unless otherwise specified.
Asterisk prefix explanation:
Omitted
= First level spare part.
One asterisk
= Second level, part of previous listed first level part.
Two asterisk
= Third level, part of previous listed second level part.
Three asterisk
= ............
Any request for not above mentioned part must encompass specific description including:
1) Model name,
2) Section name,
3) Module code,
4) Reference name,
5) Quantity number.
3J
TEST PROCEDURES & ADJUSTMENTS
Output Power*:
These procedures are relative to the ACTIVE versions (amplified loudspeakers)
only.
Precaution
200W
Max. Undistorted Out*: (4Ω)
80Vpp
Sensitivity:
(1W/1m)
97dBSPL
Max SPL:
(continuous)
120dBSPL
(peak)
123dBSPL
➭ Verify, with the Multimeter, the PTC resistor value (R59), it must be between
50Ω and 200Ω.
(amplifier+speaker)
70Hz÷20kHz
➭ SETUP:
(only amplifier -3dB)
10Hz÷60kHz
Connect the CH1 scope GND clip to CN2 pin 6 (SGND terminal).
Input Sensitivity:
(0dB)
0.775VRMS
Connect the CH1 probe tip to CN3 pin 2 or 3 (PWR out).
Input Impedance:
(balanced)
30KΩ
Connect the CH2 probe tip to D20 anode and set its sensitivity at 5V/div.
(unbalanced)
15KΩ
Set the LEVEL potentiometer full clockwise.
31±1dB
The load resistor is disconnected.
Frequency Response
➭ To prevent short circuit during any test, the oscilloscope must be EARTH
insulated
insulated, this occurs because some test require to connect its probe to the
amplifier output, non-compliance may cause damages to oscilloscope inputs
circuitry.
➭ Before removing or installing any modules and connectors, disconnect the
amplifier from AC MAINS and measure the DC supply voltages across each
of the power suppliy capacitors. If your measurement on any of the caps is
greater than 10Vdc, connect a 100Ω 10W resistor across the applicable caps
to discharge them for your safety. Remember to remove the discharge
resistor immediately after discharging caps. Do not power up the amplifier
with the discharge resistor connected
connected.
➭ Read these notes entirely before proceeding to any operation. These notes
are not comprehensive of all damages that possibly occur, but includes some
specifically advices, checks and adjustments relative to this amplified speaker.
➭ Do not check the amplifier with the speaker connected use only an
appropriate load resistor.
Voltage Gain:
IMD:
(SMPTE 60Hz/7KHz 4:1)
<0.1%
THD:
(THD+N)
<0.1%
S/N Ratio:
(unweighted)
>100dB
*Note: measured with the limiter deactivated.
➭ Connect the Variac between the mains and the amplifier and set it at zero
voltage.
➭ Turn full clockwise the LEVEL potentiometer.
➭ Connect the audio generator to the channel input and set it to 1kHz 775mV RMS
(0dB) sinusoidal signal.
➭ The power supply utilizes a dual bipolar DC rail configuration with low and
high voltages; one positive and one negative low rail (+/-Vcc1) and one
positive and one negative high rail (+/-Vcc2).
➭ Place the temperature sensor between heatsink and the PTC (R59).
➭ The procedures that follow must be executed subsequently in the order
specified.
Supply Check
➭ Check the speakers for any damaging (cone-breaking, interruption or so).
➭ Remove the transformer secondary fuses (located on SUPPLY board), set
the Variac to the nominal mains voltage, check with the Multimeter the AC
supply voltages:
F1-F2=76±2Vac
➭ If the damage has burnt a printed circuit board don’t try to repair it, replace
with a new one.
F3-F4=42±1.5Vac.
Test Instruments
➭ Re-set the Variac at zero voltage, turn off the amplifier and put the fuses back
on its holders.
➭ Connect the oscilloscope probe CH1 to the channel output, before RL1, set
it to 20V/div. 1mS/div.
➭ Audio Generator
➭ Set up the Variac slowly monitoring the Outputs with the oscilloscope CH1
connected, it should display the sinusoidal input signal amplified with no
distortions, if a distortion occur check the AMPLIFIER board as suggested in
the ADVICES section.
➭ Dual Trace Oscilloscope
➭ Digital Multimeter
➭ Temperature Meter
➭ 4Ω 500W, 100Ω 10W resistors
➭ Variac (0÷250Vac)
➭ If the protection trips, turn off the amplifier, wait some minutes and disconnect
the supplies from the amplifier module (CN2, CN3 on AMPLIFIER board),
continue to check the supplies.
AV12A Amplified Loudspeaker
➭ Finally verify the DC supplies on SUPPLY board:
The following adjustment and notes are relative to this model only.
TECHNICAL SPECIFICATIONS
Dimensions:
(WxHxD)
Weight:
Power Requirements:
CN2 pin 5 (+Vcc2)
=+54±2Vdc
CN3 pin 1 (+Vcc1)
=+29±1.5Vdc
CN3 pin 5-6 (-Vcc1)
=-29±1.5Vdc
CN3 pin 4 (-Vcc2)
=-54±2Vdc
436x616x420mm
CN2 pin 3
=+15±1Vdc
28,5Kg
CN2 pin 2
=-15±1Vdc
(230Vac±10% 50Hz)
210VA
(115Vac±10% 50/60Hz)
210VA
➭ Verify, with the Multimeter, the insulation between the heatsink and the
transistors collectors.
➭ INITIAL TEST:
Increase slowly the Variac. The channel output signals must be symmetrical
respect the GND without visible distortion and oscillation as shown in Fig.1
Trace A (Trace B shown the amplifier 2nd stage input). If there is a distortion
read the section ADVICES.
Connect the CH2 probe tip to D25 cathode and set its sensitivity at 20V/div.
When the output signal (Positive half-wave) is less than 22Vp the voltage on
D25 cathode must remain constant at 28V, when the output signal exceeds
22Vp the voltage must follow the output signal with 6V offset (see Fig.2 Trace
B), to check the negative high rail connect the probe to D26 anode (see Fig.2
Trace C ).
➭ Connect the 4Ω 500W load on the output and repeat the INITIAL and HIGH
RAIL checks.
➭ GAIN ADJUSTMENT:
Set the generator level at -10dB (0,245V RMS), adjust the trimmer VR2 on
INPUTS board to obtain an output level of 14.5Vp (10VRMS).
Visual Check
➭ Check the wiring cables for possible interruptions or shorts.
Channels Check
➭ HIGH RAIL CHECK:
Setup
Remarks
➭ Before proceed to supply the amplifier check visually the internal assembly,
if appears an evident damage find the most possible reasons that cause it.
J4
(4Ω)
➭ If one or more voltages don’t correspond, check the rectifiers, capacitors and
transformers disconnecting them from circuitry, refer to schematics.
➭ Re-set the generator level at 0dB (0,775V RMS),
➭ SIGN/COMP SENSOR CHECK:
Set the LEVEL pot to minimum, set the scope timebase at 1V/div. 1mS/div.,
then increase the level and check the SIGNAL/COMP led activity: it must turn
on (green light) when the amplifier output is higher than 1Vp.
Set the scope at 20V/div. and increase the level, check the led: it must change
from green to red colour when the amplifier output signal is 36±2Vp, increasing the input level the output signal must keep the same level, this is due to
the limiter-compression circuitry (IC2, DL1, IC1).
➭ BIAS ADJUSTMENT:
With resistive load connected wait until the temperature reach 50°c.
Set the generator level at zero, connect the Multimeter across the resistors
R60, then adjust VR1 trimmer to read 13±0.5mVdc.
➭ BANDWIDTH CHECK:
Switch alternatively the generator frequency to 100Hz and 10kHz, no level
changes must be detectable respect 1kHz.
➭ OFFSET SENSOR CHECK:
Set the Variac to zero voltage output, disconnect resistive load from the
amplifier output, connect temporarily (by means of a suitable conductor wire)
CN2 pin 3 (+15Vdc) to R72 side RL1, the protection circuitry (TR14,15,16)
detect the DC voltage and open the output relay (RL1) within 3 seconds
approx.
Remove the connection, wait until the relay switch on and after some seconds
repeat the check with -15Vdc (available on CN2 pin 2), the protection circuitry
must open the relay again.
➭ SIGNAL TO NOISE RATIO CHECK:
Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket
shorted) the output signal (noise) must be less than 1mV.
AV15A Amplified Loudspeaker
The following adjustment and notes are relative to this model only.
TECHNICAL SPECIFICATIONS
Dimensions:
(WxHxD)
Weight:
Power Requirements:
Output Power*:
➭ If the protection trips, turn off the amplifier, wait some minutes and disconnect
the supplies from the amplifier module (CN2, CN3 on AMPLIFIER board),
continue to check the supplies.
➭ BANDWIDTH CHECK:
➭ Finally verify the DC supplies on SUPPLY board:
➭ OFFSET SENSOR CHECK:
CN2 pin 5 (+Vcc2)
=+71±2Vdc
CN3 pin 1 (+Vcc1)
=+42±1.5Vdc
CN3 pin 5-6 (-Vcc1)
=-42±1.5Vdc
CN3 pin 4 (-Vcc2)
=-71±2Vdc
500x706x490mm
CN2 pin 3
=+15±1Vdc
26Kg
CN2 pin 2
=-15±1Vdc
(230Vac±10% 50Hz)
370VA
(115Vac±10% 50/60Hz)
370VA
(4Ω)
350W
➭ If one or more voltages don’t correspond, check the rectifiers, capacitors and
transformers disconnecting them from circuitry, refer to schematics.
Switch alternatively the generator frequency to 100Hz and 10kHz, no level
changes must be detectable respect 1kHz.
Set the Variac to zero voltage output, disconnect resistive load from the
amplifier output, connect temporarily (by means of a suitable conductor wire)
CN2 pin 3 (+15Vdc) to R72 side RL1, the protection circuitry (TR14,15,16)
detect the DC voltage and open the output relay (RL1) within 3 seconds
approx.
Remove the connection, wait until the relay switch on and after some seconds
repeat the check with -15Vdc (available on CN2 pin 2), the protection circuitry
must open the relay again.
➭ SIGNAL TO NOISE RATIO CHECK:
Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket
shorted) the output signal (noise) must be less than 1mV.
Max. Undistorted Out*: (4Ω)
105Vpp
Channels Check
Sensitivity:
(1W/1m)
99dBSPL
Max SPL:
(continuous)
124dBSPL
➭ Verify, with the Multimeter, the insulation between the heatsink and the
transistors collectors.
AV15SA Amplified Subwoofer
(peak)
127dBSPL
(amplifier+speaker)
60Hz÷20kHz
➭ Verify, with the Multimeter, the PTC resistor value (R59), it must be between
50Ω and 200Ω.
The following adjustment and notes are relative to this model only.
(only amplifier -3dB)
10Hz÷60kHz
➭ SETUP:
Input Sensitivity:
(0dB)
0.775V RMS
Connect the CH1 scope GND clip to CN2 pin 6 (SGND terminal).
TECHNICAL SPECIFICATIONS
Input Impedance:
(balanced)
30KΩ
Connect the CH1 probe tip to CN3 pin 2 or 3 (PWR out).
Dimensions:
(unbalanced)
15KΩ
Connect the CH2 probe tip to D20 anode and set its sensitivity at 5V/div.
Weight:
33±1dB
Set the LEVEL potentiometer full clockwise.
Power Requirements:
Frequency Response
Voltage Gain:
IMD:
(SMPTE 60Hz/7KHz 4:1)
<0.1%
THD:
(THD+N)
<0.1%
S/N Ratio:
(unweighted)
>100dB
*Note: measured with the limiter deactivated.
Setup
➭ Connect the Variac between the mains and the amplifier and set it at zero
voltage.
➭ Turn full clockwise the LEVEL potentiometer.
➭ Connect the audio generator to the channel R input and set it to 150Hz
775mV RMS (0dB) sinusoidal signal.
➭ Place the temperature sensor between heatsink and the PTC (R59).
➭ The procedures that follow must be executed subsequently in the order
specified.
Supply Check
➭ Remove the transformer secondary fuses (located on SUPPLY board), set
the Variac to the nominal mains voltage, check with the Multimeter the AC
supply voltages:
F1-F2=102±2Vac
F3-F4=60±1.5Vac.
➭ Re-set the Variac at zero voltage, turn off the amplifier and put the fuses back
on its holders.
➭ Connect the oscilloscope probe CH1 to the channel output, before RL1, set
it to 20V/div. 1mS/div.
➭ Set up the Variac slowly monitoring the Outputs with the oscilloscope CH1
connected, it should display the sinusoidal input signal amplified with no
distortions, if a distortion occur check the AMPLIFIER board as suggested in
the ADVICES section.
The load resistor is disconnected.
➭ INITIAL TEST:
Increase slowly the Variac. The channel output signals must be symmetrical
respect the GND without visible distortion and oscillation as shown in Fig.1
Trace A (Trace B shown the amplifier 2nd stage input). If there is a distortion
read the section ADVICES.
➭ HIGH RAIL CHECK:
Connect the CH2 probe tip to D25 cathode and set its sensitivity at 20V/div.
When the output signal (Positive half-wave) is less than 34Vp the voltage on
D25 cathode must remain constant at 40V, when the output signal exceeds
40Vp the voltage must follow the output signal with 6V offset (see Fig.2 Trace
B), to check the negative high rail connect the probe to D26 anode (see Fig.2
Trace C ).
➭ Connect the 4Ω 500W load on the output and repeat the INITIAL and HIGH
RAIL checks.
➭ GAIN ADJUSTMENT:
Set the generator level at -10dB (0,245VRMS), adjust the trimmer VR2 on
INPUTS board to obtain an output level of 19Vp (13.4VRMS).
➭ Re-set the generator level at 0dB (0,775VRMS),
➭ SIGN/COMP SENSOR CHECK:
Set the LEVEL pot to minimum, set the scope timebase at 1V/div. 1mS/div.,
then increase the level and check the SIGNAL/COMP led activity: it must turn
on (green light) when the amplifier output is higher than 1Vp.
Set the scope at 20V/div. and increase the level, check the led: it must change
from green to red colour when the amplifier output signal is 50±2Vp,
increasing the input level the output signal must keep the same level, this is
due to the limiter-compression circuitry (IC2, DL1, IC1).
➭ BIAS ADJUSTMENT:
Output Power*:
(WxHxD)
500x706x490mm
24,5Kg
(230Vac±10% 50Hz)
370VA
(115Vac±10% 50/60Hz)
370VA
(4Ω)
350W
Max. Undistorted Out*: (4Ω)
105Vpp
Sensitivity:
(1W/1m)
97dBSPL
Max SPL:
(continuous)
122dBSPL
(peak)
125dBSPL
Frequency Response
(filter+amplifier+speaker)
50Hz÷320Hz
(only amplifier -3dB)
10Hz÷60KHz
Input Sensitivity:
(0dB)
0.775VRMS
Input Impedance:
(balanced)
30KΩ
(unbalanced)
15KΩ
Voltage Gain:
(@150Hz)
33±1dB
IMD:
(SMPTE 60Hz/7KHz 4:1)
<0.1%
THD:
(THD+N)
<0.1%
S/N Ratio:
(unweighted)
>100dB
Setup
➭ Connect the Variac between the mains and the amplifier and set it at zero
voltage.
➭ Turn full clockwise the LEVEL and X-OVER potentiometers.
➭ Connect the audio generator to the channel R input and set it to 150Hz
775mVRMS (0dB) sinusoidal signal.
➭ Place the temperature sensor between heatsink and the PTC (R59).
➭ The procedures that follow must be executed subsequently in the order
specified.
With the load connected wait until the temperature reach 50°c.
Set the generator level at zero, connect the Multimeter across the resistors
R60, then adjust VR1 trimmer to read 15±0.5mVdc.
5J
Supply Check
➭ Remove the transformer secondary fuses (located on SUPPLY board), set
the Variac to the nominal mains voltage, check with the Multimeter the AC
supply voltages:
F1-F2=102±2Vac
F3-F4=60±1.5Vac.
➭ Re-set the Variac at zero voltage, turn off the amplifier and put the fuses back
on its holders.
➭ Connect the oscilloscope probe CH1 to the channel output, before RL1, set
it to 20V/div. 1mS/div.
➭ Set up the Variac slowly monitoring the Outputs with the oscilloscope CH1
connected, it should display the sinusoidal input signal amplified with no
distortions, if a distortion occur check the AMPLIFIER board as suggested in
the ADVICES section.
➭ If the protection trips, turn off the amplifier, wait some minutes and disconnect
the supplies from the amplifier module (CN2, CN3 on AMPLIFIER board),
continue to check the supplies.
➭ Finally verify the DC supplies on SUPPLY board:
CN2 pin 5 (+Vcc2)
=+71±2Vdc
CN3 pin 1 (+Vcc1)
=+42±1.5Vdc
CN3 pin 5-6 (-Vcc1)
=-42±1.5Vdc
CN3 pin 4 (-Vcc2)
=-71±2Vdc
CN2 pin 3
=+15±1Vdc
CN2 pin 2
=-15±1Vdc
➭ If one or more voltages don’t correspond, check the rectifiers, capacitors and
transformers disconnecting them from circuitry, refer to schematics.
Channels Check
➭ Verify, with the Multimeter, the insulation between the heatsink and the
transistors collectors.
➭ Verify, with the Multimeter, the PTC resistor value (R59), it must be between
50Ω and 200Ω.
➭ SETUP:
Connect the CH1 scope GND clip to CN2 pin 6 (SGND terminal).
Connect the CH1 probe tip to CN3 pin 2 or 3 (PWR out).
Connect the CH2 probe tip to D20 anode and set its sensitivity at 5V/div.
Set the LEVEL potentiometer full clockwise.
The load resistor is disconnected.
➭ INITIAL TEST:
Increase slowly the Variac. The channel output signals must be symmetrical
respect the GND without visible distortion and oscillation as shown in Fig.1
Trace A (Trace B shown the amplifier 2nd stage input). If there is a distortion
read the section ADVICES.
➭ HIGH RAIL CHECK:
Connect the CH2 probe tip to D25 cathode and set its sensitivity at 20V/div.
When the output signal (Positive half-wave) is less than 34Vp the voltage on
D25 cathode must remain constant at 40V, when the output signal exceeds
40Vp the voltage must follow the output signal with 6V offset (see Fig.2 Trace
B), to check the negative high rail connect the probe to D26 anode (see Fig.2
Trace C ).
➭ Connect the 4Ω 500W load on the output and repeat the INITIAL and HIGH
RAIL checks.
➭ GAIN ADJUSTMENT:
J6
Set the generator level at -10dB (0,245VRMS), adjust the trimmer VR1 on
CONTROLS & CROSSOVER board to obtain an output level of 19Vp
(13.4VRMS).
➭ If the high rails appear distorted or are not modulating as shown in figure, then
the problem probably exists somewhere in the circuitry of the respective (+
or -) defective high rail. Refer to the schematics.
➭ Re-set the generator level at 0dB (0,775VRMS),
➭ SIGN/COMP SENSOR CHECK:
Set the LEVEL pot to minimum, set the scope timebase at 1V/div. 1mS/div.,
then increase the level and check the SIGNAL/COMP led activity: it must turn
on (green light) when the amplifier output is higher than 1Vp.
Set the scope at 20V/div. and increase the level, check the led: it must change
from green to red colour when the amplifier output signal is 50±2Vp, increasing the input level the output signal must keep the same level, this is due to
the limiter-compression circuitry (IC2, DL1, IC1).
Figures
Figure 1 and 2 show the right shape of the traces but not their real levels, refer
to the levels mentioned in the chapter of appropriate amplified loudspeaker.
Figure 3 and 4 show the frequency response of the AV15SA crossover.
Fig. 1
Trace A
➭ BIAS ADJUSTMENT:
With the load connected wait until the temperature reach 50°c.
Set the generator level at zero, connect the Multimeter across the resistors
R60, then adjust VR1 trimmer to read 15±0.5mVdc.
Trace B
➭ BANDWIDTH CHECK:
The bandwidth of the amplifier board only is linear within the audio range
(20Hz-20kHz), but in this case is limited by the X-OVER circuitry on CONTROLS & CROSSOVER board.
Fig. 2
Figure 3 and 4 show the LowPass and the HighPass response, check the
correspondance with it for some frequency values (50,100,150,300 for
example).
Trace B
Trace A
➭ OFFSET SENSOR CHECK:
Set the Variac to zero voltage output, disconnect resistive load from the
amplifier output, connect temporarily (by means of a suitable conductor wire)
CN2 pin 3 (+15Vdc) to R72 side RL1, the protection circuitry (TR14,15,16)
detect the DC voltage and open the output relay (RL1) within 3 seconds
approx.
Remove the connection, wait until the relay switch on and after some seconds
repeat the check with -15Vdc (available on CN2 pin 2), the protection circuitry
must open the relay again.
Trace C
Fig. 3
X-OVER at max.
➭ SIGNAL TO NOISE RATIO CHECK:
Disconnect the audio generator and short the input (pin 1,2,3 of XLR socket
shorted) the output signal (noise) must be less than 1mV.
X-OVER at min.
Advices
➭ Check the channels one at time to determine which is right (note: if you have
a spare amplifier module that you know as right, use it).
➭ If you have determinate that the problem is a short on a rail, you must check
the output transistors to determine which transistor devices are bad.
Use a soldering iron to lift one leg of each emitter pin and measure the emittercollector resistance on each device.
Fig. 4
Unsolder and lift one leg of each base pin and check the base-collector
resistance of each transistor and replace any that measure as a short.
If all the transistors are OK, unsolder and lift one leg of each diode and check
them.
X-OVER at min.
Check the circuit board for open foil traces.
Use the Multimeter as Ohm-meter to check the resistors, particularly the base
and emitter resistors of damaged transistor.
➭ If the input sinewave appears to be distorted during the negative cycle, you
can assume that the problem is located somewhere in the circuitry of the
positive low rail.
If the positive cycle appears distorted, you can assume that the problem is in
the circuitry of the negative low rail.
X-OVER at max.
7J
J8
9J
Spare Part List (ACTIVE VERSIONS)
Code
Description
Accessories
277334
130274
130276
Owner’s Manual
Mains Cable (EU)
Mains Cable (US)
AV-12A
737103
737104
778146
768211
340079
340078
140081
140069
110119
100060
100049
080605
080156
030560
030526
020250
768207
Amplifier Assembly
200W Amplifier Module (EU)
200W Amplifier Module (US)
*
Amplifier Cables Assembly
*
200W Supply Board (Pcb#313061)
**
**
**
**
**
**
**
**
**
**
**
**
*
TO220 Mica Washer
TO220 Insulated Bush
H 2c P=10 Terminal Block
H 3c P=10mm Terminal Block
Fuse Clip 10A max (EU) (US)
7815 +15V 1A Voltage Regulator
7915 -15V 1A Voltage Regulator
KBL02 4A 200V Rectifier Diode Bridge
1N4002 1A 100V Rectifier Diode
4700u 80v 20% Snap-In Electrolytic Capacitor
2200u 35v 20% Snap-In Electrolytic Capacitor
10n 400V 10% MKT Polyester Capacitor
Inputs Board (Pcb#313058)
141189
141186
140929
120857
110267
100061
080743
080742
080293
074570
070245
042706
042630
042625
020250
727606
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
*
Hor Female XLR-Jack Socket (NCJ6FK-H Neutrik)
Hor Male XLR Socket (NC3MAH Neutrik)
9 Contacts Vert Male Connector
Vertical Male Faston 6.3mm
1sw 2pos Horizontal Slider Switch
TL072 Dual J-Fet Operational Amplifier
3mm Wide Diffused Green Led
Led 3mm Wide Diffused Red-Grn
15V 1W 5% Zener Diode
5K 31steps Linear Potentiometer
100K 20% Vertical Linear Trimmer
80K6 1/4W 1% Metalized Film Resistor
17K4 1/4W 1% Metalized Film Resistor
15K0 1/4W 1% Metalized Film Resistor
10n 400V 10% MKT Polyester Capacitor
200W Amplifier Board (Pcb#319064)
768214
141102
140929
110316
100904
100061
090917
090916
090201
090200
090194
090183
090153
080901
080245
080171
080156
080103
070105
060591
060051
042695
042685
042605
030715
340154
340079
340078
090920
090919
090918
090913
090912
090863
090862
080821
667697
237077
237078
**
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
**
**
**
**
**
**
**
**
**
**
**
*
*
*
200W Amplifier Board (Pcb#319064) without Power Transistors
6 Contacts Vert Male Connector
9 Contacts Vert Male Connector
Relay 24V / 1 Switch no 16A 250V
LM393 Dual Comparator
TL072 Dual J-Fet Operational Amplifier
MJE350 TO126 Pnp Transistor
MJE340 TO126 Npn Transistor
2N5401 TO92 Pnp Transistor
2N5550 TO92 Npn Transistor
BC560 TO92 LN Pnp Transistor
BC550 TO92 LN Npn Transistor
BC327 TO92 Pnp Transistor
VTL5C4 Analog Optoisolator
7V5 1W 5% Zener Diode
FE6B 6A 100V Fast Recovery Diode
1N4002 1A 100V Rectifier Diode
1N4148 100mA 75V Signal Diode
470E 20% Vertical Linear Trimmer
8K2 2W 10% Resistor
0E22 5W 5% Wire Resistor
56K2 1/4W 1% Metalized Film Resistor
47K5 1/4W 1% Metalized Film Resistor
10K0 1/4W 1% Metalized Film Resistor
1000u 6v3 20% Vert Electrolytic Capacitor
TO3/TO218 Mica Washer
TO220 Mica Washer
TO220 Insulated Bush
MJE802 TO126 Npn Darl Transistor
MJE15031 TO220 Pnp Transistor
MJE15030 TO220 Npn Transistor
MJE4352 TO218 Pnp Transistor
MJE4342 TO218 Npn Transistor
TIP36C TO218 Pnp Transistor
TIP35C TO218 Npn Transistor
Ptc 90 PTH59F04BE222TS
Rear Panel
Transformer 230Vac 200W (EU)
Transformer 115Vac 200W (US)
210215
210212
*
*
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Slider Switch Adhesive Gasket
J 10
110614
110291
110029
110014
110036
110035
080607
020491
778112
768202
667702
667700
659027
657271
657270
229037
227056
210242
210217
210215
210211
120964
120148
120147
*
Mains Socket
*
Power Switch
*
T4A Fuse 5x20mm (EU)
*
T2.5A Fuse 5x20mm (EU)
*
T4A Fuse 6.3x32mm (US)
*
T2.5A Fuse 6.3x32mm (US)
*
KBPC25 25A 200V Rectifier Diode Bridge
*
100nF 10% 250Vac Polyester Capacitor
Box Assembly
Cables Assembly
Crossover Filter Board (Pcb#313063) AV-12/4 Ohm
Handle
Grid
White Pot Knob
Box
EWT(TM) Elliptical Horn
1" 4ohm Horn Tweeter
12" 4ohm Woofer Speaker
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Gasket between Tweeter and Horn
M4i M5e x17.5mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
AV-15A
778146
768212
Amplifier Assembly
350W Amplifier Module (EU)
350W Amplifier Module (US)
*
Amplifier Cables Assembly
*
350W Supply Board (Pcb#313061)
340079
340078
140081
140069
110119
100060
100049
080606
080293
080156
060403
030560
030555
768208
**
**
**
**
**
**
**
**
**
**
**
**
**
*
TO220 Mica Washer
TO220 Insulated Bush
H 2c P=10 Terminal Block
H 3c P=10mm Terminal Block
Fuse Clip 10A max (EU) (US)
7815 +15V 1A Voltage Regulator
7915 -15V 1A Voltage Regulator
GBU8D 8A Rectifier Diodes Bridge
15V 1W 5% Zener Diode
1N4002 1A 100V Rectifier Diode
180E 3W 10% Resistor
4700u 80v 20% Snap-In Electrolytic Capacitor
4700u 50V 20% Snap-In Electrolytic Capacitor
Inputs Board (Pcb#313058)
141189
141186
140929
120857
110267
100061
080743
080742
080293
074570
070245
042715
042630
042625
727607
**
**
**
**
**
**
**
**
**
**
**
**
**
**
*
Hor Female XLR-Jack Socket (NCJ6FK-H Neutrik)
Hor Male XLR Socket (NC3MAH Neutrik)
9 Contacts Vert Male Connector
Vertical Male Faston 6.3mm
1sw 2pos Horizontal Slider Switch
TL072 Dual J-Fet Operational Amplifier
3mm Wide Diffused Green Led
Led 3mm Wide Diffused Red-Grn
15V 1W 5% Zener Diode
5K 31steps Linear Potentiometer
100K 20% Vertical Linear Trimmer
82K5 1/4W 1% Metalized Film Resistor
17K4 1/4W 1% Metalized Film Resistor
15K0 1/4W 1% Metalized Film Resistor
350W Amplifier Board (Pcb#319064)
768215
141102
140929
110316
100904
100061
090917
090916
090201
090200
090194
090183
090153
080901
080245
080171
080156
080103
070105
060591
060051
042695
042687
042605
**
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
350W Amplifier Board (Pcb#319064) without Power Transistors
6 Contacts Vert Male Connector
9 Contacts Vert Male Connector
Relay 24V / 1 Switch no 16A 250V
LM393 Dual Comparator
TL072 Dual J-Fet Operational Amplifier
MJE350 TO126 Pnp Transistor
MJE340 TO126 Npn Transistor
2N5401 TO92 Pnp Transistor
2N5550 TO92 Npn Transistor
BC560 TO92 LN Pnp Transistor
BC550 TO92 LN Npn Transistor
BC327 TO92 Pnp Transistor
VTL5C4 Analog Optoisolator
7V5 1W 5% Zener Diode
FE6B 6A 100V Fast Recovery Diode
1N4002 1A 100V Rectifier Diode
1N4148 100mA 75V Signal Diode
470E 20% Vertical Linear Trimmer
8K2 2W 10% Resistor
0E22 5W 5% Wire Resistor
56K2 1/4W 1% Metalized Film Resistor
49K9 1/4W 1% Metalized Film Resistor
10K0 1/4W 1% Metalized Film Resistor
737105
737106
030715
340783
340154
340079
340078
090924
090923
090920
090919
090918
090863
090862
080821
667698
237068
237069
***
**
**
**
**
**
**
**
**
**
**
**
**
*
*
*
210215
210212
110614
110291
110029
110018
110037
110036
080607
020491
*
Adhesive Rubber Foam 10x1.9mm (Specify mt)
*
Slider Switch Adhesive Gasket
*
Mains Socket
*
Power Switch
*
T4A Fuse 5x20mm (EU)
*
T6.3A Fuse 5x20mm (EU)
*
T6.3A Fuse 6.3x32mm (US)
*
T4A Fuse 6.3x32mm (US)
*
KBPC25 25A 200V Rectifier Diode Bridge
*
100nF 10% 250Vac Polyester Capacitor
Box Assembly
Cables Assembly
Crossover Filter Board (Pcb#313062) AV-15/4 Ohm
778112
768204
667703
667701
659027
657272
657270
229036
227058
210242
210217
210215
210211
120965
120148
120147
1000u 6v3 20% Vert Electrolytic Capacitor
TO264 Mica Washer
TO3/TO218 Mica Washer
TO220 Mica Washer
TO220 Insulated Bush
MJL21194 TO264 Npn Transistor
MJL21193 TO264 Pnp Transistor
MJE802 TO126 Npn Darl Transistor
MJE15031 TO220 Pnp Transistor
MJE15030 TO220 Npn Transistor
TIP36C TO218 Pnp Transistor
TIP35C TO218 Npn Transistor
Ptc 90 PTH59F04BE222TS
Rear Panel
Transformer 230Vac 350W (EU)
Transformer 115Vac 350W (US)
Handle
Grid
White Pot Knob
Box
EWT(TM) Elliptical Horn
1" 8ohm Horn Compression Driver
15" 4ohm Woofer Speaker
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Gasket between Tweeter and Horn
M4i M5e x24mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
AV-15SA
737107
737108
778147
768213
340079
340078
100060
100049
080606
080293
080156
060403
030884
030555
768210
140929
140908
140873
110305
100919
100084
100061
100019
080743
080742
080103
075820
074570
070241
042717
042625
042617
042605
042565
042555
768209
141189
141186
140935
Amplifier Assembly
350W Amplifier Module (EU)
350W Amplifier Module (US)
*
Amplifier Cables Assembly
*
350W Supply Board (Pcb#313061)
**
**
**
**
**
**
**
**
**
**
*
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
**
*
TO220 Mica Washer
TO220 Insulated Bush
7815 +15V 1A Voltage Regulator
7915 -15V 1A Voltage Regulator
GBU8D 8A Rectifier Diodes Bridge
15V 1W 5% Zener Diode
1N4002 1A 100V Rectifier Diode
180E 3W 10% Resistor
10000U 80V 20% Snap-In Electrolytic Capacitor
4700u 50V 20% Snap-In Electrolytic Capacitor
Controls & Crossover Board (Pcb#313060)
9 Contacts Vert Male Connector
6 Contacts Vert Male Small Connector
4 Contacts Vert Male Connector
Relay 12V / 2 Switch 1A 250V
MC33078 Dual LN Operational Amplifier
TL074 Quad J-Fet Operational Amplifier
TL072 Dual J-Fet Operational Amplifier
TL071 LN J-Fet Operational Amplifier
3mm Wide Diffused Green Led
Led 3mm Wide Diffused Red-Grn
1N4148 100mA 75V Signal Diode
4x100K 16mm Hor Rotary Alog Potentiometer
5K 31steps Linear Potentiometer
100K 20% Horizontal Linear Trimmer
88K7 1/4W 1% Metalized Film Resistor
15K0 1/4W 1% Metalized Film Resistor
13K0 1/4W 1% Metalized Film Resistor
10K0 1/4W 1% Metalized Film Resistor
4K99 1/4W 1% Metalized Film Resistor
4K22 1/4W 1% Metalized Film Resistor
Inputs Board (Pcb#313059)
**
**
**
Hor Female XLR-Jack Socket (NCJ6FK-H Neutrik)
Hor Male XLR Socket (NC3MAH Neutrik)
6 Contacts Hor Male Connector
140872
110267
080293
727607
**
**
**
*
4 Contatcs Hor Male Connector
1sw 2pos Horizontal Slider Switch
15V 1W 5% Zener Diode
350W Amplifier Board (Pcb#319064)
768215
141102
140929
110316
100904
100061
090917
090916
090201
090200
090194
090183
090153
080901
080245
080171
080156
080103
070105
060591
060051
042695
042687
042605
030715
340783
340154
340079
340078
090924
090923
090920
090919
090918
090863
090862
080821
667699
237068
237069
**
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
***
**
**
**
**
**
**
**
**
**
**
**
**
*
*
*
350W Amplifier Board (Pcb#319064) without Power Transistors
6 Contacts Vert Male Connector
9 Contacts Vert Male Connector
Relay 24V / 1 Switch no 16A 250V
LM393 Dual Comparator
TL072 Dual J-Fet Operational Amplifier
MJE350 TO126 Pnp Transistor
MJE340 TO126 Npn Transistor
2N5401 TO92 Pnp Transistor
2N5550 TO92 Npn Transistor
BC560 TO92 LN Pnp Transistor
BC550 TO92 LN Npn Transistor
BC327 TO92 Pnp Transistor
VTL5C4 Analog Optoisolator
7V5 1W 5% Zener Diode
FE6B 6A 100V Fast Recovery Diode
1N4002 1A 100V Rectifier Diode
1N4148 100mA 75V Signal Diode
470E 20% Vertical Linear Trimmer
8K2 2W 10% Resistor
0E22 5W 5% Wire Resistor
56K2 1/4W 1% Metalized Film Resistor
49K9 1/4W 1% Metalized Film Resistor
10K0 1/4W 1% Metalized Film Resistor
1000u 6v3 20% Vert Electrolytic Capacitor
TO264 Mica Washer
TO3/TO218 Mica Washer
TO220 Mica Washer
TO220 Insulated Bush
MJL21194 TO264 Npn Transistor
MJL21193 TO264 Pnp Transistor
MJE802 TO126 Npn Darl Transistor
MJE15031 TO220 Pnp Transistor
MJE15030 TO220 Npn Transistor
TIP36C TO218 Pnp Transistor
TIP35C TO218 Npn Transistor
Ptc 90 PTH59F04BE222TS
Rear Panel
Transformer 230Vac 350W (EU)
Transformer 115Vac 350W (US)
210215
210212
110614
110291
110029
110018
110037
110036
080607
020491
667703
667701
659027
659026
657273
347393
227060
*
Adhesive Rubber Foam 10x1.9mm (Specify mt)
*
Slider Switch Adhesive Gasket
*
Mains Socket
*
Power Switch
*
T4A Fuse 5x20mm (EU)
*
T6.3A Fuse 5x20mm (EU)
*
T6.3A Fuse 6.3x32mm (US)
*
T4A Fuse 6.3x32mm (US)
*
KBPC25 25A 200V Rectifier Diode Bridge
*
100nF 10% 250Vac Polyester Capacitor
Box Assembly
Handle
Grid
White Pot Knob
Orange Pot Knob
Box
Threaded Clog (to steady on the floor)
15" 4ohm Woofer Speaker
210242
210217
210215
177721
120965
120148
120147
667704
Filler for Speaker Box (Specify m²)
Black Sealer (specify mt)
Adhesive Rubber Foam 10x1.9mm (Specify mt)
Fixing Plate (to fix the Floor Bracket)
M4i M5e x24mm Threaded Pin
Screw M5x65mm for Handle
Screw M4x8mm for Speakers
Floor Bracket with Threaded Knobs
Note:
Each spare part is single quantity unless otherwise specified.
Asterisk prefix explanation:
Omitted
= First level spare part.
One asterisk
= Second level, part of previous listed first level part.
Two asterisk
= Third level, part of previous listed second level part.
Three asterisk
= ............
Any request for not above mentioned part must encompass specific description including:
1) Model name,
2) Section name,
3) Module code,
4) Reference name,
5) Quantity number.
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