- source impedance for the induction via the XLR-type connector: R(Q) = 50 ohms
- the AMPLIFIER PCB is provided with service connectors:
CNS1CNS2CNRC
PINAssigned toPINAssigned toPINAssigned to
1-Vcc1LIM A Switch1LIM Out A
2BIAS +A2-15V2LIM Out B
3BIAS -A3LIM B Switch3Standby via RC
4FAN Voltage4+15V4Standby LED
5+Vcc5AGND5-Vss
6BIAS +B6Speaker Out A6+Vss
7BIAS -B7Relay/Protect7n.c.
8Temp Heatsink8Speaker Out B8n.c.
- Pin-assignment of the power amplifiers output connector:
PINFunctionChannel
1+ pole of the 100V output and + pole of the 25V output
2- pole of the 25V output and + pole of the 70V output
3- pole of the 70V output and - pole of the 100V outputB
4+ pole Direct Output
5- pole Direct Output
6,7not assigned-
8- pole Direct Output
9+ pole Direct Output
10- pole of the 70V output and - pole of the 100V outputA
11- pole of the 25V output and + pole of the 70V output
12+ pole of the 100V output and + pole of the 25V output
Pin-assignment of the Power Remote connector:PIN 1 control voltage -
PIN 2 control voltage +
1
Page 3
Nominal load impedances
100V output70V output25V output
DPA 4245
DPA 4260
1. Operation voltage: U(B) = 230V / 50Hz ... 60Hz
2. Deviation limit of the operation voltage:-30% .... +10%
3. Power consumption (both channels driven via the 100V output, f = 1kHz)
idling condition power consumption30-60W40-80W
nominal power consumption (nominal load)1580W1950W
standard power consumption (nominal load)470W620W
maximum power consumption (nominal load)1680W2180W
power consumption at 1/8 of the maximum output capacity600W870W
4. Settings
4.1. IDLING CURRENT ADJUSTMENT
28,5ΩΩ14ΩΩ1,8ΩΩ
20ΩΩ9,8ΩΩ1,25ΩΩ
DPA 4245DPA 4260
Connect the DC-volt meter at the BIAS measuring points (refer to service connectors) and adjust the idling
current via the trim potentiometer VR101/VR301 (located on the Main PCB). Adjust both channels of the power
amplifier A&B to U(DC) = 7.5mV. Adjusting the idling current has to be performed at normal room
temperature. In case the power amplifier had previously been operated, it has to be given several hours to regain
its normal temperature.
4.2. VCA - OFFSET
Rhythmically open and short-circuit CNS2.1 and CNS2.2 for channel A as well as CNS2.3 and CNS2.2 for
channel B. The switches are located on the Main PCB. Using VR100 or VR300 respectively to adjust the power
amplifier's Direct Output to its minimum offset (with oscilloscope to minimal peak value or to the audible
minimal volume of the interfering pulse).
5. Functioning test
5.1. OUTPUT - offset voltage
DC-voltage measuring at the Direct Output A/B with U(DC) 10mV.
5.2. LIMITER
5.2.1. Voltage limiter
Both channels separately driven without load via the Direct Output with a 1 kHz signal up to U(A) = 38V.
Increase the input voltage by 10 dB. The LIMITER LED lights and the output voltage ascents by approx. 1.5 dB
or 2.5 dB respectively to approx. 44V or 52V, respectively. The distortion rate of the limited signal should not
ascent above 0.8%.
5.2.2. Distortion limiter
Both channels separately driven via the Direct Output at 2Ω with a 1 kHz signal up to U(A) = 20V or U(A) =
25V, respectively. Increase the input voltage by 5 dB. The LIMITER LED lights and the output voltage ascents
by approx. 1.5dB to approx. 25V or 29V respectively and it is slightly clipping. The distortion rate of the limited
signal is approx. THD = 2 ... 3%. Further increasing the input signal by +10dB should not result in a remarkably
higher clipping of the output signal.
2
Page 4
5.2.3. Attack- and release times
separately testing the power amplifier channels is mandatory: Test has to be performed at the Direct Output
without load.
1.) Drive the power amplifier's input with a burst signal (f = 1kHz, 10 cycles, rate : 3 sec.) and U(E) = +10dBu.
2.) Monitor the output signal via oscilloscope. After 1 - 2 signal periods, the limiter has reduced the major
distortion to a minor residual distortion (THD ≤ 1%)
attack time: approx. 2 msrelease time: approx. 130 ms
5.3 POWER-ON DELAY
Feed the test signal to the power amplifier input. Switch the power amplifier ON using the "Power On" switch.
Approximately 2 seconds after pressing the "Power On" switch, the signal is present at the output.
5.4 POWER REMOTE
Switch the power of the appliance OFF. Feed a control voltage of +24V to the Power Remote input. The power
amplifier has to start operation and after disconnecting the control voltage has to go off again.
5.5 FAN CONTROL
Upon powering-on the power amplifier, the fans will run for approximately 2 seconds and stop when the power
amplifier has re-gained its "normal" temperature. In idling condition (power-on, no signal present) the fans are
switched between the SLOW and OFF mode, depending on the heat sink's temperature. Connecting the CNS1.8
via a 5kΩ resistor to +15V lets the fans run in SLOW mode. A FAN VOLTAGE of 16.8V DC can be measured
between pin CNS2.4 and pin CNS1.4. When disconnecting CN5, the fans will run in FAST mode. A FAN
VOLTAGE of 28V DC is measured between pin CNS2.4 and pin CNS1.4.
5.6 SOAR-PROTECTION TEST
Channels separately driven up to 0dB via the Direct-Output, terminated with 4Ω. Parallel connect an 1Ω resistor.
The protection circuit reacts and tries continuously to re-start! The protect-LED lights.
5.7 SHORT-CIRCUIT CURRENT-LIMITING TEST
separately testing the power amplifier channels without load is mandatory:
- drive the channel with a burst signal (f = 1kHz, 1-3 cycles, rate ≈ 1 sec.), at the Direct Output with
U(E) = 0dBu.
- connect a load resistor of 1Ω.
- the short-circuit current-limiter limits the output voltage at the load resistor symmetrically (monitor via
oscilloscope!) to a peak voltage value of 15V or 20V respectively (approx. 15A or 20A respectively maximum
peak output current).
5.8 DC-voltage and HF-Protection Circuit
- Testing the protection circuitry against the occurrence of DC-voltage and HF at the output is only possible
directly via the Main PCB when it is not installed in the appliance.
5.9 INDICATORS TEST
Feed a 1kHz sine signal while slowly increasing the level. At approx. -30dBu the SIGNAL LEDs will light and
at approx. +1.5dBu the Limit LED will light.
The circuit ground (at the input or the output connector) is measured versus the common ground of the enclosure
(contact at the ground terminal, located on the rear panel - or common ground of the mains cord).
without input transformer GROUNDED : R = 0 Ωwith input transformer GROUNDED: R = 0Ω
NOT GROUNDED: R = 5 ΩNOT GROUNDED: R→∞
8. Amplitude - Non-Linearities
- MBW = 80kHz
- all channels terminated with nominal load at nominal power, Direct Output at 8Ω or at 4Ω respectively, at
nominal power
MeasurementDPA 4245DPA 4260Remarks
100V70V25VDirect100V70V25VDirect
THD+N
IMD-SMPTE
DIM 30
Drive the power amplifier in idling condition via the transformer outputs up to the nominal output voltage.
Connect the nominal load and measure the level changes.
DPA 4245DPA 4260
100V Output
70V Output
25V Output
0,7 dB0,7 dB
0,8 dB0,8 dB
1,1 dB1,1 dB
4
Page 6
11. Crosstalk
It is necessary to align the output transformers when testing the crosstalk. Therefore, turn the transformer outputs
by 90° to each other and both by 45° to the rear panel. Terminate the 100V-outputs with nominal load and feed a
1kHz signal with -10dBu to the B-channel. Measure the crosstalk at the 100V output of the A-channel using a
selective band pass filter and suitable measuring equipment. Turn the upper transformer for minimal reading.
Apply a 1kHz signal with -10dBu at the A-channel and measure the crosstalk at the B-channel. Crosstalk
attenuation on both channels has to at least ≥80dB .
12. Noise interference
- U(F) = external voltage un-weighted with B = 22 Hz … 22 kHz, effective value (IEC 268-1)
- U(G) = noise voltage, frequency-weighting filter according to CCIR-468-3, quasi peak weighted (IEC 268-1)
- U(A) = interference voltage A-weighted, dB(A), effective value (IEC 268-1)
- Signal-to-noise ratio referenced to the maximum output voltage at nominal load, A-weighted
- All inputs have to be terminated with 50Ω each; during the noise interference measurement, the outputs have to
be without load
Power amplifierOutputU(F)
dBu
LEVEL control up
DPA 4245, 4260100V-55-45-57-102100
DPA 4245, 426070V-58-47-60-102100
DPA 4245, 426025V-68-56-70-102100
DPA 4245, 4260Direct-64-52-66-102100
LEVEL control down
DPA 4245, 4260100V-57-47-59-DPA 4245, 426070V-59-50-61-DPA 4245, 426025V-70-58-72-DPA 4245, 4260Direct-66-54-68--
13. Settings when shipped
BRIDGED MODE switch set to NORMAL.
INPUT ROUTING switch set to DUAL/STEREO.
LEVEL control all the way right.
14. Dimensions and Weight
Power amplifierWeightDimensions in mm
DPA 424520.5kg483 x 132.5 x 385.5
DPA 426022.5kg483 x 132.5 x 385.5
U(G)
dBu
U(A)
dBu
IN(A)
dBu
S/N-R.
dB
5
Page 7
Page 8
Page 9
Page 10
Page 11
Seite / Page 1 / 9
Ersatzteilliste - Bill of Materials
121714
DPA 4245 2X450W VERST.
Pos. Nr.
Best. Nr.
Zubehör
Accessories & packing material
Mechanische Teile
Cabinet material
841888
PCBAR#DPA4245
pcb assy 84188
Ref. No.
G0010343270GLRI GBPC 3504 rectifier GBPC-P 3504
Part No.BezeichnungDescription
355871BEDIENUNGSANL. DPA4245/426user manual DPA4245/4260
300425KABEL-NETZ 2.0 M 10A power cable Europe
354179KABELGEHÄUSE 12POL KGS-MSconnector housing
354178STECKERLEISTE 12POL IC2.5/connector male 12-pin
354885BUCHSENLEISTE 2POL connector female 2-pole
354691BUCHSENLEISTE 3POL connector female 3-pole
332652KRT. L 2400 612X570X270carton outer
347526KRT. IN L 2400 502X465X155carton inner
303715STYROPOR-ECK 150X150X150X50styrofoam #2
348018SCHUTZFOLIE 1200X800X0,05 poly bag
327495STYROPOR-ECK 150X150X100X50styrofoam #1
345438SCHUTZHÜLLE 165X345X0,05 plastic bag
349988FALTEINLAGE 750X280carton filler
349989FALTEINLAGE 1864X150carton filler
E0100354859RELAIS 793-P-1C-S-24V DC relay 24V
E0300354859RELAIS 793-P-1C-S-24V DC relay 24V
F0001302582SICHER T 1 A 250V fuse 1A slow blow
F0002302582SICHER T 1 A 250V fuse 1A slow blow
F0003332065SICHER T 8 A 250V fuse 8A slow blow
H0100343456DICKS-NETZW. 8PIN 2%res.network 8x4k7
H0101343457DICKS-NETZW. 8PIN 2%res.network 8x10k
H0300343456DICKS-NETZW. 8PIN 2%res.network 8x4k7
H0301343457DICKS-NETZW. 8PIN 2%res.network 8x10k
I0001332985IC TL 074 CN IC TL 074 CN
I0100327197IC NE 5532 P 2FACH OPIC NE 5532 N
I0101307421IC CA 3080 E OTAIC CA 3080 E
I0102332985IC TL 074 CN IC TL 074 CN
I0103338359IC LM 308 AN IC LM 308 A
I0300327197IC NE 5532 P 2FACH OPIC NE 5532 N
I0301307421IC CA 3080 E OTAIC CA 3080 E
I0302332985IC TL 074 CN IC TL 074 CN
I0303338359IC LM 308 AN IC LM 308 A
JS001338835STECKER-KALTGERÄTE connector male mains
L0100348592FILTERSP. 2.50UH/0.004OHMcoil 2.5uH
L0300348592FILTERSP. 2.50UH/0.004OHMcoil 2.5uH
Q0001306928TRANS BC 560 C transistor BC 560 C
Q0002306928TRANS BC 560 C transistor BC 560 C
Q0003306928TRANS BC 560 C transistor BC 560 C
Q0004306928TRANS BC 560 C transistor BC 560 C
Q0005306928TRANS BC 560 C transistor BC 560 C
Q0008307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0009301184TRANS BC 550 C transistor BC 550 B
Q0010348591TRANS BC 618 DARL. TO 92transistor BC 618
Q0011301184TRANS BC 550 C transistor BC 550 B
Q0012307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0017307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0018307430TRANS BC 327-25 TO 92transistor BC 327-25
Q0019307430TRANS BC 327-25 TO 92transistor BC 327-25
Q0020301235TRANS BD 242 B transistor BD 242 B
Q0021307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0022301236TRANS BD 241 B transistor BD 241 B
Q0023307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0100348421TRANS 2N 3906 transistor 2N 3906
Q0101335763TRANS 2N 3904 transistor 2N 3904
Q0103330264TRANS J 111 transistor J 111 A
Q0104335763TRANS 2N 3904 transistor 2N 3904
Q0105348421TRANS 2N 3906 transistor 2N 3906
Q0106348422TRANS MPSA 42 transistor MPSA 42
Q0107348423TRANS MPSA 92 transistor MPSA 92
Q0108335763TRANS 2N 3904 transistor 2N 3904
Q0109348421TRANS 2N 3906 transistor 2N 3906
Q0110348422TRANS MPSA 42 transistor MPSA 42
Q0111348423TRANS MPSA 92 transistor MPSA 92
Q0112335763TRANS 2N 3904 transistor 2N 3904
Q0113348421TRANS 2N 3906 transistor 2N 3906
Q0114335763TRANS 2N 3904 transistor 2N 3904
VR100348486WI-TRI 47.00 KOHM LIN pot trim 47k Ohm lin
Part No.BezeichnungDescription
Page 18
Seite / Page 8 / 9
121714
DPA 4245 2X450W VERST.
Pos. Nr.
Best. Nr.
813408
PCB-A:DPA4245/4260 N 5
pcb assy 81340
Ref. No.
VR101348674WI-TRI 250.00 OHM LIN pot trim 250 Ohm lin
VR300348486WI-TRI 47.00 KOHM LIN pot trim 47k Ohm lin
VR301348674WI-TRI 250.00 OHM LIN pot trim 250 Ohm lin
E0100354859RELAIS 793-P-1C-S-24V DC relay 24V
E0300354859RELAIS 793-P-1C-S-24V DC relay 24V
F0001302582SICHER T 1 A 250V fuse 1A slow blow
F0002302582SICHER T 1 A 250V fuse 1A slow blow
F0003302565SICHER T 10 A 250V fuse 10A slow blow
H0100343456DICKS-NETZW. 8PIN 2%res.network 8x4k7
H0101343457DICKS-NETZW. 8PIN 2%res.network 8x10k
H0300343456DICKS-NETZW. 8PIN 2%res.network 8x4k7
H0301343457DICKS-NETZW. 8PIN 2%res.network 8x10k
I0001332985IC TL 074 CN IC TL 074 CN
I0100327197IC NE 5532 P 2FACH OPIC NE 5532 N
I0101307421IC CA 3080 E OTAIC CA 3080 E
I0102332985IC TL 074 CN IC TL 074 CN
I0103338359IC LM 308 AN IC LM 308 A
I0300327197IC NE 5532 P 2FACH OPIC NE 5532 N
I0301307421IC CA 3080 E OTAIC CA 3080 E
I0302332985IC TL 074 CN IC TL 074 CN
I0303338359IC LM 308 AN IC LM 308 A
JS001338835STECKER-KALTGERÄTE connector male mains
L0100348592FILTERSP. 2.50UH/0.004OHMcoil 2.5uH
L0300348592FILTERSP. 2.50UH/0.004OHMcoil 2.5uH
Q0001306928TRANS BC 560 C transistor BC 560 C
Q0002306928TRANS BC 560 C transistor BC 560 C
Q0003306928TRANS BC 560 C transistor BC 560 C
Q0004306928TRANS BC 560 C transistor BC 560 C
Q0005306928TRANS BC 560 C transistor BC 560 C
Q0008307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0009301184TRANS BC 550 C transistor BC 550 B
Q0010348591TRANS BC 618 DARL. TO 92transistor BC 618
Q0011301184TRANS BC 550 C transistor BC 550 B
Q0012307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0017307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0018307430TRANS BC 327-25 TO 92transistor BC 327-25
Q0019307430TRANS BC 327-25 TO 92transistor BC 327-25
Q0020301235TRANS BD 242 B transistor BD 242 B
Q0021307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0022301236TRANS BD 241 B transistor BD 241 B
Q0023307150TRANS BC 337-25 TO 92transistor BC 337-25
Q0100348421TRANS 2N 3906 transistor 2N 3906
Q0101335763TRANS 2N 3904 transistor 2N 3904
Q0103330264TRANS J 111 transistor J 111 A
Q0104335763TRANS 2N 3904 transistor 2N 3904
Q0105348421TRANS 2N 3906 transistor 2N 3906
Q0106348422TRANS MPSA 42 transistor MPSA 42
Q0107348423TRANS MPSA 92 transistor MPSA 92
Q0108335763TRANS 2N 3904 transistor 2N 3904
Q0109348421TRANS 2N 3906 transistor 2N 3906
Q0110348422TRANS MPSA 42 transistor MPSA 42
Q0111348423TRANS MPSA 92 transistor MPSA 92
Q0112335763TRANS 2N 3904 transistor 2N 3904
Q0113348421TRANS 2N 3906 transistor 2N 3906
Q0114335763TRANS 2N 3904 transistor 2N 3904
S0002338886SCHALTER-SCHIEBE L202-02-1-switch slide
VR100348486WI-TRI 47.00 KOHM LIN pot trim 47k Ohm lin
VR101348674WI-TRI 250.00 OHM LIN pot trim 250 Ohm lin
VR300348486WI-TRI 47.00 KOHM LIN pot trim 47k Ohm lin
VR301348674WI-TRI 250.00 OHM LIN pot trim 250 Ohm lin