Ecler MPA280 Service Manual

MPA280

SERVICE MANUAL

SERVICE MANUAL MPA280

INDEX

- BLOCK DIAGRAM

- SCHEMATICS

- COMPONENTS LOCATION SCHEMA

- TESTING AND QUALITY CONTROL

- TECHNICAL CHARACTERISTICS

- WIRING DIAGRAM

- MECHANICAL DIAGRAM

- PACKING DIAGRAM

PARTS LIST: PRINTED CIRCUIT 11.0649 REV:
MODEL: MPA280 DRW.Nº 33.0259 and 260PL REPLACES:
DATE: 15.01.98 SHEET 1 OF 5 REPLACED BY:

REFERENCE VALUE CODE

C101 22µ/35 FCCE200220
C102 C100p FCXCN21000
C103 22µ/35 FCCE200220
C104 C100p FCXCN21000
C105 22µ/35 FCCE200220
C106 C100p FCXCN21000
C107 22µ/35 FCCE200220
C108 C100p FCXCN21000
C109 10µ/50 FCCE250100
C110 10µ/50 FCCE250100
C111 10µ/50 FCCE250100
C112 10µ/50 FCCE250100
C113 C12p FCXCN11200
C114 C47p FCXCN14700
C115 47µ/16 FCCE100000
C116 18n FCXCN40180
C117 4.7n FCXCN40047
C118 Not assembled
C119 33n FCXCN40330
C120 47µ/16 FCCE100000
C121 47µ/16 FCCE100000
C122 C47p FCXCN14700
C123 47µ/16 FCCE100000
C124 47µ/16 FCCE100000
C125 C47p FCXCN14700
C126 47µ/16 FCCE100000
C127 470n FCXCN44700
C128 470n FCXCN44700
C129 22µ/35 FCCE200220
C130 10µ/50 FCCE250100
C131 10µ/50 FCCE250100
C132 22µ/100 FCCE200220
C133 100n FCXCN41000
C134 22µ/35 FCCE200220
C135 22µ/100 FCCE350220
C136 100n FCXCN41000
C137 33n FCXCN40330
C138 470n FCXCN44700
C139 470n FCXCN44700
C140 10µ/50 FCCE250100
C141 10µ/50 FCCE250100
C142 22µ/100 FCCE350220
C143 100n FCXCN41000
C144 22µ/35 FCCE200220
C145 22µ/100 FCCE350220
C146 100n FCXCN41000
C147 33n FCXCN40330
C148 22µ/35 FCCE200220
C149 470n FCXCN44700
C150 470n FCXCN44700
C151 22µ/35 FCCE200220
C152 10µ/50 FCCE250100
C153 10µ/50 FCCE250100
C154 22µ/100 FCCE350220
C155 100n FCXCN41000
C156 22µ/35 FCCE200220
C157 22µ/100 FCCE350220
C158 100n FCXCN41000

PARTS LIST: PRINTED CIRCUIT 11.0649 REV:
MODEL: MPA280 DRW.Nº 33.0259 and 260PL REPLACES:
DATE: 15.01.98 SHEET 2 OF 5 REPLACED BY:

REFERENCE VALUE CODE

C159 33n FCXCN40330
C160 470n FCXCN44700
C161 470n FCXCN44700
C162 22µ/35 FCCE200220
C163 10µ/50 FCCE200220
C164 10µ/50 FCCE200220
C165 22µ/100 FCCE350220
C166 100n FCXCN41000
C167 22µ/35 FCCE200220
C168 22µ/100 FCCE350220
C169 100n FCXCN41000
C170 33n FCXCN40330
C171 10µ/50 FCCE250100
C172 10µ/50 FCCE250100
C173 10µ/50 FCCE250100
C174 10µ/50 FCCE250100
C175 10000µ/63 FCCE321000
C176 10000µ/63 FCCE321000
C177 100n FCXCN41000
C178 100n FCXCN41000
D101 BAS16 FCXDDBAS16
D102 Green led FCLED300VE
D103 BAS16 FCXDDBAS16
D104 Green led FCLED300VE
D105 BAS16 FCXDDBAS16
D106 Green led FCLED300VE
D107 BAS16 FCXDDBAS16
D108 Green led FCLED300VE
D109 BAS16 FCXDDBAS16
D110 BYD17M FCXDD40070
D111 BYD17M FCXDD40070
D112 Z4.7 FCXZ000047
D113 Red led FCLED300RO
D114 BAS16 FCXDDBAS16
D115 BYD17M FCXDD40070
D116 BYD17M FCXDD40070
D117 Z4.7 FCXZ000047
D118 Red led FCLED300RO
D119 BAS16 FCXDDBAS16
D120 BYD17M FCXDD40070
D121 BYD17M FCXDD40070
D122 Z4.7 FCXZ000047
D123 Red led FCLED300RO
D124 BAS16 FCXDDBAS16
D125 BYD17M FCXDD40070
D126 BYD17M FCXDD40070
D127 Z4.7 FCXZ000047
D128 Red led FCLED300RO
D129 Z16 FCXZ000160
D130 Z16 FCXZ000160
D131 FB3506L FCREC35065
HS101 SERADHE 1237 FCRAD12370
HS102 SERADHE 1237 FCRAD12370
HS103 SERADHE 1237 FCRAD12370
HS104 SERADHE 1237 FCRAD12370
HS105 HEAD SINK 2906.6 FCRAD29060
HS106 HEAD SINK 2906.6 FCRAD29060
IC101 TL072 FCIC072010

PARTS LIST: PRINTED CIRCUIT 11.0649 REV:
MODEL: MPA280 DRW.Nº 33.0259 and 260PL REPLACES:
DATE: 15.01.98 SHEET 3 OF 5 REPLACED BY:

REFERENCE VALUE CODE

IC102 TL072 FCIC072010
IC103 TL072 FCIC072010
IC104 TL072 FCIC072010
IC105 TL072 FCIC072010
IC106 TL072 FCIC072010
IC107 TL072 FCIC072010
IC108 TDA7294 FCIC729400
IC109 TDA7294 FCIC729400
IC110 TDA7294 FCIC729400
IC111 TDA7294 FCIC729400
J101 YKC21-3035 FCBASR0600
J102 YKC21-3035 FCBASR0600
J103 YKD31-0496 FCCTJAL100
J104 YKD31-0496 FCCTJAL100
J105 350430-1 FCCTAMP040
J106 350430-1 FCCTAMP040
J107 350430-1 FCCTAMP040
L101 68µH FCCHK00680
L102 68µH FCCHK00680
L103 68µH FCCHK00680
L104 68µH FCCHK00680
L105 1µH FCIND00200
L106 1µH FCIND00200
L107 1µH FCIND00200
L108 1µH FCIND00200
Q101 BC857B FCXTT08570
Q102 BC857B FCXTT08570
Q103 BC857B FCXTT08570
Q104 BC857B FCXTT08570
Q105 MJE15030 FCTR150300
Q106 MJE15031 FCTR150310
R101 100 Ohms FCXR021000
R102 470k FCXR054700
R103 100 Ohms FCXR021000
R104 470k FCXR054700
R105 100 Ohms FCXR021000
R106 100k FCXR051000
R107 100 Ohms FCXR021000
R108 100k FCXR051000
R109 10kAx2 FCPR210040
R110 22k FCXR042200
R111 22k FCXR042200
R112 100k FCXR051000
R113 10kAx2 FCPR210040
R114 22k FCXR042200
R115 10kAx2 FCPR210040
R116 22k FCXR042200
R117 22k FCXR042200
R118 22k FCXR042200
R119 100k FCXR051000
R120 10kAx2 FCPR210040
R121 1k5 FCXR031500
R122 MF332k FCXR153320
R123 MF1k FCXR131000
R124 MF1k FCXR131000
R125 1k5 FCXR031500
R126 MF340k FCXR153400
R127 MF1k FCXR131000

PARTS LIST: PRINTED CIRCUIT 11.0649 REV:
MODEL: MPA280 DRW.Nº 33.0259 and 260PL REPLACES:
DATE: 15.01.98 SHEET 4 OF 5 REPLACED BY:

REFERENCE VALUE CODE

R128 MF1k FCXR131000
R129 MF1k FCXR131000
R130 MF340k FCXR153400
R131 MF1k FCXR131000
R132 1k5 FCXR031500
R133 MF1k FCXR131000
R134 MF332k FCXR153320
R135 MF1k FCXR131000
R136 1k5 FCXR031500
R137 150k FCXR051500
R138 75k FCXR047500
R139 150k FCXR051500
R140 22k FCXR042200
R141 100k FCXR051000
R142 22k FCXR042200
R143 MF97k6 FCXR149760
R144 MF97k6 FCXR149760
R145 Not assembled
R146 Not assembled
R147 MF36k5 FCXR143650
R148 100k FCXR051000
R149 22k FCXR042200
R150 MF1k FCXR131000
R151 22k FCXR042200
R152 10k FCXR041000
R153 33k FCXR043300
R154 22k FCXR042200
R155 20 Ohms FCXR012000
R156 2k2 FCXR032200
R157 MF18k2 FCXR141820
R158 22k FCXR042200
R159 22k FCXR042200
R160 33k FCXR043300
R161 MF10k FCXR141000
R162 22k FCXR042200
R163 20 Ohms FCXR012000
R164 2k2 FCXR032200
R165 MF18k2 FCXR141820
R166 MF1k FCXR131000
R167 22k FCXR042200
R168 22k FCXR042200
R169 33k FCXR043300
R170 MF10k FCXR141000
R171 MF1k FCXR131000
R172 22k FCXR042200
R173 2k2 FCXR032200
R174 20 Ohms FCXR012000
R175 MF18k2 FCXR141820
R176 22k FCXR042200
R177 MF10k FCXR141000
R178 33k FCXR043300
R179 MF1k FCXR131000
R180 22k FCXR042200
R181 2k2 FCXR032200
R182 20 Ohms FCXR012000
R183 MF18k2 FCXR141820
R184 22k FCXR042200
R185 3k FCXR033000

PARTS LIST: PRINTED CIRCUIT 11.0649 REV:
MODEL: MPA280 DRW.Nº 33.0259 and 260PL REPLACES:
DATE: 15.01.98 SHEET 5 OF 5 REPLACED BY:

REFERENCE VALUE CODE

R186 3k FCXR033000
R187 20 Ohms FCXR012000
R188 20 Ohms FCXR012000
R189 20 Ohms FCXR012000
R190 20 Ohms FCXR012000
R191 20 Ohms FCXR012000
R192 20 Ohms FCXR012000
R193 20 Ohms FCXR012000
R194 20 Ohms FCXR012000
R195 6k8 FCXR036800
R196 6k8 FCXR036800
R197 6k8 FCXR036800
R198 6k8 FCXR036800
R199 3k FCXR033000
R200 3k FCXR033000
S101 Dial switch RS003-A066BQ FCINTR0500
S102 Switch 17128 FCINTD4000

NORMS FOR CHECKING THE MPA POWER AMPLIFIER.

- Connect a charge of 4Ω in each output channel CH1 CH2, CH3 and CH4

- Put the SIGNAL INPUT button on CH4 MONO

- Put a 1 kHz 0dB signal in INPUT CH1

- Check that the 4 signal present and 4 clip led indicators are on.

- Check the movement of the buttons and that each one acts independently on its own
respective channel, at the same time check that the clip led indicator goes off when you go down
approximately 2dB. Leave them on maximum.

- Check the power of 230V at the mains

Vo = 13.6v at 4Ω W = 46.24
Vo = 16.7 at 8Ω W = 34.86

- Check that the range goes from 20Hz-20kHz.

- Put the button on 4 CH ST.

- Put a signal in through INPUT CH1 and CH2, CH3 and CH4 act as a stack-out.

- Check that there is a signal in each output and that the power is correct.

- Position 4CH QUAD.

- Check that each of the inputs CH1,CH2,CH3 and CH4 are independent and correspond to
their respective outputs. Also check that the leds of clip and SP act with their corresponding
input.

- Position 2CH BRIDGED ST.

- Put a charge of 8Ω in the red terminal of CH1-CH2 and do the same for CH3-CH4 ( see

diagram on amp for the correct connection)

- Check that only the buttons of CH1 affect the output formed by CH1-CH2 and the buttonof CH4
affects the output formed by CH3-CH4. The clips should act with their respective group. The
CH2 and CH3 buttons have no effect.

Vo = 28.3 8Ω W = 100

- Position 2 CH ST. + 1 CH BRIDGED

- Charge the CH1 and CH 2 outputs with 4 Ω and CH3-CH4 in the red terminals with 8Ω.

- Check that the buttons of CH1 and CH2 affect their respective outputs and that the group
CH3-CH4 acts with the CH4 button. The CH3 button has no effect.

- The powers will be the same as in previous cases.

STEREO at 4Ω Vo = 13.6 W = 46.24
MONO at 8Ω Vo = 28.3 W = 100

- Position 2CH ST.+1CH BRIDGED LOW.

- Put signal in INPUT CH1, CH2 of 150 Hz 0dB.

- It should act the same as in the previous case.

STEREO at 4Ω Vo = 13.6 CH1,CH2
MONO at 8Ω Vo = 19.6 CH3-CH4

MPA280 QUALITY CONTROL.

We will use a mixer with unbalanced output and a nominal output level of 1V RMS as
the signal source for our tests.

Connect the mixer outputs to the power amplifier inputs. Plug the power amplifier to
mains (check that its specified voltage matches that of mains) and make sure that SP and the
power switch LEDs all light up . Turn up the amplifier output level until the CLIP LEDs light
up. Turn the output level back down and plug the loudspeakers.

Check the sound quality (no distorsions or noises). Check ATT action (ATT travel,
signal cut at their low end, no scratching or clicking noises and correct stereo channel
matching for each one). While the power amplifier is working shake it or throw it on a table to
make sure the output sound goes on playing correctly. Shortcircuit the power amplifier output
and check it goes back to normal operation when you stop shorcircuiting. Repeat the same
procedure for the other channel.

TECHNICAL CHARACTERISTICS

Output power

(WRMS, 20Hz-20kHz, 1% THD)

1 Channel 4 Ohm 71W
4 Channels 4Ohm 4x55W
4 Channels 8 Ohm 4x40W
2 Channels 8 Ohm 2x112W

Frequency response @ max output power(-1dB) 12Hz - 200kHz

Harmonic Dist. + Noise @ 1kHz <0.06%

Intermodulation distortion (SMPTE) 50Hz and 7kHz
@ 4:1 ratio, nominal power <0.008%

TIM 100 <0.2%

Signal/noise ratio (20Hz-20kHz)

ref. 1W/4Ω >75dB
ref. nominal power/4Ω >92dB

Damping factor @ 1kHz/8Ω >150
Slew Rate ±10Vµs

Channel crosstalk @ 1kHz >68dB

Input connector RCA

Sensitivity nom/impedance 0dBV(1V)/>25kΩ

SIGNAL PRESENT indicators -40dBV

Output connector Screw terminal
CLIP indicators -1.5dB real clip

Mains Depending on your country.
See characteristics in the back of the unit.

Power consumption @ max. out. power/4Ω 450VA

Dimensions Front panel 482.6x88mm
Chassis 440x88x246mm

Weight 7.5kg

PARTS LIST: MECHANICAL DIAGRAM REV:
MODEL: MPA280 DRW.Nº 30.0085 REPLACES:
DATE: 17.03.98 SHEET 1 OF 1 REPLACED BY:

QUANTITY VALUE CODE

1 FRONT PANEL WD.00.2243 FCMECMPA30
1 LOWER COVER WD.00.2240 FCMECMPA20
1 REAR PANEL WD.00.2254 FCMECMPA60
1 COVER WD.00.2241 FCMECMPA50
1 LEFT LATERAL WD.00.2242 FCMECMPA40
1 RIGHT LATERAL WD.002242 FCMECMPA40
5 WHITE CONTROL KNOB D15 FCBOT15BL3
4 NUT M5 DIN934 FCTUE00500
1 GROUND TERMINAL WD.00.1761 FCBOR00300
1 WASHER M4 SEG FCARS40000
1 TRANSFORMER WASHER FCMECARTR0
1 WASHER M4 ADE FCARDE0300
1 MAINS INPUT AC-13 FCBASRE300
1 TRANSFORMER WHITH ASSEMBLY KIT FCTFTMPA00
2 SPACER WLS-20-0 FCSEPWLS20
1 POWER SWITCH FCINTRED25
4 SCREW 2.9x13 DIN7981 FCT4002913
1 SCREW M4x10 DIN 7985 FCT7004010

22 SCREW M4x6 SPANLO DIN 7985 FCT7504006

1 ASSEMBLED PRINTED CIRCUIT 11.0649

PARTS LIST: PACKING DIAGRAM REV:
MODEL: MPA280 DRW.Nº 32.0030PL REPLACES:
DATE: 18.05.98 SHEET 1 OF 1 REPLACED BY:

QUANTITY VALUE CODE

4 METAL WASHER 5x11.5x0.8 FCARN50000
4 WASHER AT 5x11.5x3.5 ABS FCARAT3000
1 PACKING BOX MPA280 FCCAJP8800
1 FUSE T 6.3A FCFUS50180
4 BASE ADHESIVE FCPIE11255
2 PROTECTING M872/1 FCCANT0075
1 BAG FOR MANUAL 120x180mm FCBOL00200
1 PLASTIC BAG 43x60cm FCBOLS0100
1 PLASTIC BAG 60x80mm FCBOL00100
1 MANUAL MPA280 FCMANMPA00
1 WARRANTY CARD FCTARJG000
1 MAIN SUPPLY CABLE STANDARD FCCONX0400