LEM K3 Active User manual

Index
Soldering point.
M ale connector.
Fem ale connector.
M/F faston connector.
Test point.
Supply voltage. Logic supply ground.
Analog supply ground.
C hassis ground.
Earth ground.
Flag joined w ith one or m ore flags
GENERALMUSIC S.p.A. Sales Division: 47842 S.Giovanni in Marignano (RN) ITALY - Via delle Rose, 12 - tel. [phone] - fax [phone]
GENERALMUSIC on the NET: http://www.generalmusic.com
SERVICE MANUAL
▲
CODE: 270222
▼
Warnings
w ith the sam e signal nam e inscri ed.
Address
ATTENTION
O serve precautions w hen handling electrostatic sensitive devices.
Notice
Service m ust e carried out y qualified personnel only.A ny tam pering carried out y unqualified personnel during the guarantee p e rio d
w ill forfeit the right to guarantee.
For a correct operation of the instrum ent, after having sw itched off, e careful to w ait at least 3 seconds efore sw itching on again.
To im prove the device's specifications, the schem atic diagram s m ay e su ject to change w ithout prior notice.
All com ponents m arked y this sym ol have special safety characteristics, w hen replacing any of these com ponents use only
m anufacturer's specified parts.
The (µ) m icro sym ol of capacitance value is su stituted y U .
The (
Ω) om ega sym ol of resistance value is su stituted y E .
The electrolytic capacitors are 25V dc rated voltage unless otherw ise specified.
All resistors are 1/8W unless otherw ise specified.
All sw itches show n in the "O FF" position. A ll D C voltages m easured to ground w ith a voltm eter 20K O hm /V .
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T e c h n ic a l S p e c ific a tio n s - B ia s A d ju n tm e n ts - B lo c k D ia g ra m
In p u ts B o a rd s
6 0 0 W P o w e r A m p lifie r A s s e m ly (K 6 A c tiv e )
3 5 0 W P o w e r A m p lifie r A s s e m ly (K 3 A c tiv e )
Spare Part List
S e c o n d E d itio n

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BIAS ADJUSTEMENT
Instruments, materials and tools:Instruments, materials and tools:
Instruments, materials and tools:Instruments, materials and tools:
Instruments, materials and tools:
- Audio Generator
- Dual Trace Oscilloscope with 10x prober
- Digital Voltmeter (or Multimeter)
- 8Ω 1000W Resistor
- Temperature Meter
Setup:Setup:
Setup:Setup:
Setup:
- Connect the Audio Generator to the input and set it to output 1KHz sinusoidal signal
- Connect the Dual Trace Oscilloscope to the input (set CH1trace at 0 5V/div 200usec /div) and to the output (set CH2 trace at 20V/div
200usec/div) of the amplifier
WARNING: The oscilloscope must be earth insulatedWARNING: The oscilloscope must be earth insulated
WARNING: The oscilloscope must be earth insulatedWARNING: The oscilloscope must be earth insulated
WARNING: The oscilloscope must be earth insulated
- Insert the temperature sensor through the interstize between the heatsink and R15 (PTC)
- Unconnect amplifier's output from the cross-over and connect the 8Ω 1000W resistor instead of it
- Insert the voltmeter terminals across R22
ADJUSTMENT PROCEDUREADJUSTMENT PROCEDURE
ADJUSTMENT PROCEDUREADJUSTMENT PROCEDURE
ADJUSTMENT PROCEDURE
1) Turn on the amplifier
2) Set the input signal to obtain approximatelly 120Vpp on the output
3) When the temperature has reaches about 50°C (122°F) set the input level to minimum
4) Adjust the trimmer VR1 to read a voltage of 3±0 05mV on the multimeter
5) Check that the voltage across the R74 resistor has the same value
6) At the same temperature condition, adjust the VR2 trimmer to read 4±0 05mV across R26 resistor
7) Check that the voltage on the R78 resistor has the same value
Verifing:Verifing:
Verifing:Verifing:
Verifing:
1) Increase the input level to obtain an output voltage about of 0 5Vpp
2) Check with the oscilloscope that the output signal is without a cross-talk distortion and eventually slightly adjust the VR1 position until
distortion disappears
(Note: the voltage value across the R22 and across R74 resistor must not exceed 5mV)
3) Re-connect the cooling fan and the crossover instead of the 8Ω 1000W resistor
TECHNICAL SPECIFICATIONS
K 3 Active K 6 Active
POWER (EIA RS-426A) Watts EIA 300 550
HANDLING Watts IHF 350 600
DISTORTION (THD+N) <0,02% <0,02%
INPUT kohms 30 balanced 31 balanced
IMPEDANCE kohms 15 unbalanced 15 unbalanced
INPUT SENSITIVITY dB 0
(
0,775 V
)
0
(
0,775 V
)
POWER SUPPLY
230Vac +/-15% 50-60Hz
115Vac +/-15% 50-60Hz
230Vac +/-15% 50-60Hz
115Vac +/-15% 50-60Hz
SENSITIVITY
(
SPL 1W/1m
)
dB 100 100
MAX SPL continous dB 121 124
MAX SPL peak dB 124 127
FREQUENCY RESPONSE Hz (-10dB) 60-20000 50-20000
DISPERSION ANGLE (OxV) ° 60x60 60x60
CROSSOVER FREQUENCY Hz 1,8kHz at 12-18dB/oct. 1,4kHz at 12-18dB/oct.
COMPONENTS HIGH
LOW
1" driver coaxial
12" woofer
1.5" driver coaxial
15" woofer
Cabinet: birch pol
y
wood.
CONSTRUCTION Finish: Black scratch-resistant paint
Metal Grille
Pol
y
urethane front panel
Volume Control.
CONTROLS SHIELD
Limiter ON/OFF.
CONNECTIONS Combo - 1 XLR-M
POWERCON power connector
DIMENSION mm (WxHxD) 542x496x537 542x656x537
WEIGHT kg 36 47

3 3
3 3
3
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Spare Parts ListSpare Parts List
Spare Parts ListSpare Parts List
Spare Parts List
LegendLegend
LegendLegend
Legend
(K3) = Specify K3 version only
(K6) = Specify K6 version only
(US) = Specify USA version
(EU) = Specify Europe version
Code Description
Optional AccessoriesOptional Accessories
Optional AccessoriesOptional Accessories
Optional Accessories
950860 SC20 Metallic Support
950199 SC30 Alluminium Support
950978 SC31 Telescopic Alluminium Support
951136 Mains Link Cable for KL-K6 Active
141208 * Mains Power Grey Plug (NTPW3FCB Neutrik)
141205 * Mains Power Blue Plug (NTPW3FCA Neutrik)
AccessoriesAccessories
AccessoriesAccessories
Accessories
277329 Owner’s Manual
887090 Mains Cable (2 5m) (US)
887089 Mains Cable (2 5m) (EU)
141205 * Mains Power Blue Plug (NTPW3FCA Neutrik)
130434 * Mains Cable (US)
130285 * Mains Cable (EU)
190137 5mm Hexagonal Rod Spanner
120142 6x35 Screw with Hex Head
Cabinet AssemblyCabinet Assembly
Cabinet AssemblyCabinet Assembly
Cabinet Assembly
778138 Speakers Cables Assembly
717063 Cabinet Chassis (K6)
717062 Cabinet Chassis (K3)
667678 Metal Grid (K6)
667677 Metal Grid (K3)
347378 Front Panel (K6)
347377 Front Panel (K3)
227054 15" Coaxial Speaker (K6)
227053 12" Coaxial Speaker (K3)
210242 Filler for Speaker Box (Specify mt)
210265 Acoustic Transparent FOAM
190181 Rubber Foot with M8 Screw
177676 Metal Grid Fixing
177325 Bespeco Flange
Filter BoardFilter Board
Filter BoardFilter Board
Filter Board
768184 Filter Board (PCB#313052) (K6)
768183 Filter Board (PCB#313051) (K3)
The service is made only by replacemement of entire board
K6 600W Power Amplifier AssemblyK6 600W Power Amplifier Assembly
K6 600W Power Amplifier AssemblyK6 600W Power Amplifier Assembly
K6 600W Power Amplifier Assembly
737098737098
737098737098
737098 600W Power Amplifier Assembly (EU)600W Power Amplifier Assembly (EU)
600W Power Amplifier Assembly (EU)600W Power Amplifier Assembly (EU)
600W Power Amplifier Assembly (EU)
737099737099
737099737099
737099 600W Power Amplifier Assembly (US)600W Power Amplifier Assembly (US)
600W Power Amplifier Assembly (US)600W Power Amplifier Assembly (US)
600W Power Amplifier Assembly (US)
778139 * Amplifier Cables Assembly
667683 * Power Amplifier Chassis
659027 * White Potentiometer Knob
238074 * Transformer 230Vac 690W (EU) (K6)
238075 * Transformer 115Vac 690W (US) (K6)
210216 * Adhesive Rubber Foam 20x5mm (Specify mt)
210215 * Adhesive Rubber Foam 10x1 9mm (Specify mt)
141204 * Mains Power Blue Socket (NTPW3MPA Neutrik)
110291 * Power Switch
110120 * Fuse Clip (US)
110119 * Fuse Clip (EU)
110038 * T16A Fuse 6 3x32mm (US)
110026 * T1 25A Fuse 6 3x32mm (US)
110013 * T1 25A Fuse 5x20mm (EU)
080607 * KBPC25 25A 200V Rectifier Diode Bridge
030890 * 10000u 125V -10+50% V Electrolytic Capacitor VT
020491 * 100nF 10% 250Vac Polyester Capacitor
737095737095
737095737095
737095 **
**
*600W Power Amplifier Board (PCB#319040)600W Power Amplifier Board (PCB#319040)
600W Power Amplifier Board (PCB#319040)600W Power Amplifier Board (PCB#319040)
600W Power Amplifier Board (PCB#319040)
090924 ** MJL21194 TO264 Npn Transistor
090923 ** MJL21193 TO264 Pnp Transistor
230530 ** 1uH 10% 630ma Rf Coil
140917 ** 2 Contacts Vert Male Connector
110316 ** Relay 24V / 1 Switch no 16A 250V
100061 ** TL072 Dual J-Fet Operational Amplifier
100060 ** 7815 +15V 1A Voltage Regulator
100049 ** 7915 -15V 1A Voltage Regulator
090920 ** MJE802 TO126 Npn Darl Transistor
090201 ** 2N5401 TO92 Pnp Transistor
090200 ** 2N5550 TO92 Npn Transistor
090194 ** BC560 TO92 LN Pnp Transistor
090183 ** BC550 TO92 LN Npn Transistor
080282 ** 13V 1W 5% Zener Diode
080245 ** 7V5 1W 5% Zener Diode
080168 ** W02M 1 5A Rectifier Diodes Bridge
080158 ** 1N4006 1A 800V Rectifier Diode
080156 ** 1N4002 1A 100V Rectifier Diode
080103 ** 1N4148 100mA 75V Signal Diode
070106 ** 470E 20% Horizontal Linear Trimmer
042725 ** 100K 1/4W 1% Metalized Film Resistor
042685 ** 47K5 1/4W 1% Metalized Film Resistor
042565 ** 4K99 1/4W 1% Metalized Film Resistor
042564 ** 4K75 1/4W 1% Metalized Film Resistor
042557 ** 4K32 1/4W 1% Metalized Film Resistor
042345 ** 75E0 1/4W 1% Metalized Film Resistor
030715 ** 1000u 6v3 20% Vert Electrolytic Capacitor
030526 ** 2200u 35v 20% Snap-In Electrolytic Capacitor
140929 ** 9 Contacts Vert Male Connector
140068 ** 3 Contacts Terminal Block
110119 ** 6 3x32mm and 5x20mm Fuse Clip
090919 ** MJE15031 TO220 Pnp Transistor
090918 ** MJE15030 TO220 Npn Transistor
090917 ** MJE350 TO126 Pnp Transistor
090916 ** MJE340 TO126 Npn Transistor
090183 ** BC550 TO92 LN Npn Transistor
080820 ** Ptc 80 PTH59F04BF222TS
727567 ** Fan Assembly
110363 ** * 24Vdc (80x32cm) Fan
210215 ** Adhesive Rubber Foam 10x1 9mm (Specify mt)
177603 ** Amplifier Board Support
768189768189
768189768189
768189 **
**
*Inputs Board (PCB#313041)Inputs Board (PCB#313041)
Inputs Board (PCB#313041)Inputs Board (PCB#313041)
Inputs Board (PCB#313041)
141189 ** Hor Female XLR-Jack Socket (NCJ6FK-H Neutrik)
141186 ** Hor Male XLR Socket (NC3MAH Neutrik)
140929 ** 9 Contacts Vert Male Connector
110267 ** 1sw 2pos Horizontal Slider Switch
100061 ** TL072 Dual J-Fet Operational Amplifier
090194 ** BC560 TO92 LN Pnp Transistor
090183 ** BC550 TO92 LN Npn Transistor
080901 ** VTL5C4 Analog Optoisolator
080743 ** 3mm Wide Diffused Green Led
080742 ** Led 3mm Wide Diffused Red-Grn
080293 ** 15V 1W 5% Zener Diode
080168 ** W02M 1 5A Rectifier Diodes Bridge
074570 ** 5K 31steps Linear Potentiometer
K3 350W Power Amplifier Assembly K3 350W Power Amplifier Assembly
K3 350W Power Amplifier Assembly K3 350W Power Amplifier Assembly
K3 350W Power Amplifier Assembly
737096737096
737096737096
737096 350W Power Amplifier Assembly (EU)350W Power Amplifier Assembly (EU)
350W Power Amplifier Assembly (EU)350W Power Amplifier Assembly (EU)
350W Power Amplifier Assembly (EU)
737097737097
737097737097
737097 350W Power Amplifier Assembly (US)350W Power Amplifier Assembly (US)
350W Power Amplifier Assembly (US)350W Power Amplifier Assembly (US)
350W Power Amplifier Assembly (US)
778139 * Amplifier Cables Assembly
667683 * Power Amplifier Chassis
659027 * White Potentiometer Knob
238088 * Transformer 230Vac 430W (EU) (K3)
238089 * Transformer 115Vac 430W (US) (K3)
210216 * Adhesive Rubber Foam 20x5mm (Specify mt)
210215 * Adhesive Rubber Foam 10x1 9mm (Specify mt)
141204 * Mai ns Power Blue Socket (NTPW3MPA Neutrik)
110291 * Power Switch
110120 * Fuse Clip (US)
110119 * Fuse Clip (EU)
110027 * T10A Fuse 6 3x32mm (US)
110026 * T1 25A Fuse 6 3x32mm (US)
110013 * T1 25A Fuse 5x20mm (EU)
080607 * KBPC25 25A 200V Rectifier Diode Bridge
020491 * 100nF 10% 250Vac Polyester Capacitor
737094737094
737094737094
737094 **
**
*350W Power Amplifier Board (PCB#319040)350W Power Amplifier Board (PCB#319040)
350W Power Amplifier Board (PCB#319040)350W Power Amplifier Board (PCB#319040)
350W Power Amplifier Board (PCB#319040)
090924 ** MJL21194 TO264 Npn Transistor
090923 ** MJL21193 TO264 Pnp Transistor
230530 ** 1uH 10% 630mA Rf Coil
140917 ** 2 Contacts Vert Male Connector
110316 ** Relay 24V / 1 Switch no 16A 250V
100061 ** TL072 Dual J-Fet Operational Amplifier
100060 ** 7815 +15V 1A Voltage Regulator
100049 ** 7915 -15V 1A Voltage Regulator
090924 ** MJL21194 TO264 Npn Transistor
090923 ** MJL21193 TO264 Pnp Transistor
090920 ** MJE802 TO126 Npn Darl Transistor
090201 ** 2N5401 TO92 Pnp Transistor
090200 ** 2N5550 TO92 Npn Transistor
090194 ** BC560 TO92 LN Pnp Transistor
090183 ** BC550 TO92 LN Npn Transistor
080282 ** 13V 1W 5% Zener Diode
080245 ** 7V5 1W 5% Zener Diode
080168 ** W02M 1 5A Rectifier Diodes Bridge
080158 ** 1N4006 1A 800V Rectifier Diode
080156 ** 1N4002 1A 100V Rectifier Diode
080103 ** 1N4148 100mA 75V Signal Diode
070106 ** 470E 20% Horizontal Linear Trimmer
042725 ** 100K 1/4W 1% Metalized Film Resistor
042685 ** 47K5 1/4W 1% Metalized Film Resistor
042565 ** 4K99 1/4W 1% Metalized Film Resistor
042564 ** 4K75 1/4W 1% Metalized Film Resistor
042557 ** 4K32 1/4W 1% Metalized Film Resistor
042345 ** 75E0 1/4W 1% Metalized Film Resistor
030715 ** 1000u 6v3 20% Vert Electrolytic Capacitor
030526 ** 2200u 35v 20% Snap-In Electrolytic Capacitor
140929 ** 9 Contacts Vert Male Connector
140068 ** 3 Contacts Terminal Block
110119 ** 6 3x32mm and 5x20mm Fuse Clip
090919 ** MJE15031 TO220 Pnp Transistor
090918 ** MJE15030 TO220 Npn Transistor
090917 ** MJE350 TO126 Pnp Transistor
090916 ** MJE340 TO126 Npn Transistor
090183 ** BC550 TO92 LN Npn Transistor
080819 ** Ptc 70 PTH59F04BG222TS
727567 ** Fan Assembly
110363 ** * 24Vdc (80x32cm) Fan
177603 ** Amplifier Board Support
768188768188
768188768188
768188 **
**
*Inputs Board (PCB#313041)Inputs Board (PCB#313041)
Inputs Board (PCB#313041)Inputs Board (PCB#313041)
Inputs Board (PCB#313041)
141189 ** Hor Female XLR-Jack Socket (NCJ6FK-H Neutrik)
141186 ** Hor Male XLR Socket (NC3MAH Neutrik)
140929 ** 9 Contacts Vert Male Connector
110267 ** 1sw 2pos Horizontal Slider Switch
100061 ** TL072 Dual J-Fet Operational Amplifier
090194 ** BC560 TO92 LN Pnp Transistor
090183 ** BC550 TO92 LN Npn Transistor
080901 ** VTL5C4 Analog Optoisolator
080743 ** 3mm Wide Diffused Green Led
080742 ** Led 3mm Wide Diffused Red-Grn
080293 ** 15V 1W 5% Zener Diode
080168 ** W02M 1 5A Rectifier Diodes Bridge
074570 ** 5K 31Steps Linear Potentiometer
030866 ** 4700u 100V -10+50% V Electrolytic Capacitor
Note:Note:
Note:Note:
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