Mackie ART300A User manual

ART300A
Active Loudspeaker
Service Manual
2002 MACKIE DESIGNS, INC.

2
ART300A Service Manual
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY

3
ART300A Service Manual
CONTENTS
Safety Instructions...........................................................2
Introduction.....................................................................4
Active Speaker Safety Test............................................5
Overview..........................................................................7
Rear Panel ....................................................................... 8
Specifications..................................................................9
Parts ...............................................................................10
Final Assembly............................................................10
Amplifer Assembly.....................................................11
Amplifier PCB Assembly............................................12
Input Board Assembly and PCB...............................14
RCF Parts Differences................................................15
Main Circuit Board..........................................................16
Schematics
Crossover ..............................................................16
High Frequency Amplifier....................................17
Low Frequency Amplifier.....................................18
Power Supply........................................................19
PCB Layout.................................................................20
Input Board......................................................................21
Schematic..................................................................21
PCB Layout.................................................................22

4
ART300A Service Manual
Introduction
About this Manual
This manual contains the basic repair information for the ART series loudspeakers. For
each model, the following information is supplied:
• Safety information
• Overview
• Rear panel view and features
• Specifications and test details
• Parts list, containing a master parts list and sub-assembly parts
• Parts list differences between RCF and Mackie Industrial ART speakers
• Schematics
• PCB layout drawing
It is essential that you have a copy of the user’s manual as this contains the complete
operating instructions.
Service Technical Assistance
Mackie Designs, Service Technical Assistance, is available 8AM - 5PM PST, Monday
through Friday for Authorized Mackie Service Centers, at 1-800-258-6883. Feel free to
call with any questions and speak with a carefully-calibrated technician. If one is not
available, leave a detailed message and a qualified Mackoid will return your call asap.
Disclaimer
The information contained in this manual is proprietary to Mackie Designs, Inc. The entire
manual is protected under copyright and may not be reproduced by any means without
express written permission from Mackie Designs, Inc.
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY
EXPERIENCED REPAIR TECHNICIANS ONLY
www.mackieindustrial.com
16220 Wood-Red Road NE, Woodinville, WA 98072 USA
TEL [phone], FAX [phone], [email protected]
UK +44.1268.571.212, FAX [phone] [email protected]
ITALY +39.0522.354.111, FAX [phone] [email protected]
FRANCE +33.3.8546.9160, FAX [phone] [email protected]
GERMANY +49.2572.96042.0, FAX [phone] [email protected]

5
ART300A Service Manual
You must perform the following leakage test before returning any active speakers to your
customer. Take every safety precaution to protect yourself while doing this test.
1. Make a small loading RC circuit as shown in the diagram below, and connect the
AC volt meter between the AC power source ground and any exposed metal on
the unit under test.
2. Connect the unit under test to an AC power source using a ground-lift adaptor,
leaving the unit’s safety ground floating. Turn the unit on.
3. The meter reading should be less than 750mVAC (note: this is equivalent to 0.5mA
of leakage current).
4. Flip the plug over in the receptical so the hot and neutral are swapped.
Verify that the reading is still less then 750mVAC.
5. If either reading is greater than 750mVAC, then you must investigate and repair
the speaker before returning it to your customer.
Active speaker safety test

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ART300A Service Manual
Safety First!
Before connecting and using the equipment, please read the Quick-Start Guide
carefully and keep it for future reference.
Warning
This equipment has been designed to be installed by qualified professionals only! There
are many factors to be considered when installing professional sound reinforcement
systems, including mechanical and electrical considerations, as well as acoustic
coverage and performance. Mackie Industrial strongly recommends that this equipment
be installed only by a professional sound installer or contractor.
1. Never install, connect, or disconnect the unit with the power supply on.
2. Before powering up the speaker, make sure the voltage select switch
corresponds to the AC Voltage supply.
3. Make sure the safety ground on the power cord is properly grounded.
4. To prevent the risk of electric shock, never open the unit. There are no user
serviceable parts inside.
5. To ensure normal cooling of the amplifier, make sure the unit is well ventilated.
Avoid exposure to direct sunlight or proximity to any heat source, dust, or
dampness.
Installation
A 1-3/8" (35mm) socket is provided in the bottom of the cabinet for mounting the
loudspeaker on a speaker stand.
The speaker can be suspended with approved rigging hardware. Always use at least two
M10 threaded inserts located on opposite sides of the enclosure. The speaker must be
positioned so that the weight of the enclosure is equally distributed over the two inserts.
Warning
Never attempt to suspend the ART Series loudspeakers by their handles. Consult a
professional rigger or structural engineer prior to suspending loudspeakers from a
structure not intended for that use. Always know the working load limit of the structure
supporting the loudspeaker array. Always make sure that the rigging hardware minimum
rating is at least five times the actual load.

7
ART300A Service Manual
Overview
The ART300A is a full-range two-way
professional active speaker system
that combines high power and wide
bandwidth in a light-weight enclosure
for fixed-installation systems. The
12" low-frequency transducer, in
combination with a 1" compression
driver coupled to an integral 90º x 70º
constant directivity polynomial horn,
form an extremely powerful package
for any small to medium-sized sound
reinforcement application.
It features a balanced XLR input with
a Mic/Line switch and a paralleled
balanced XLR output for cascading
multiple speakers. Rear panel
controls also include Music and Voice
equalization switches, a rotary volume
control, and an input limiter.
The two built-in power amplifiers
provide 300W for the LF driver and
60W for the HF driver. The enclosure
is constructed of high-strength
polypropylene, with M10 threaded
inserts on all four sides for rigging, and
an integral locking 1-3/8" socket in the
bottom for mounting on a standard
speaker stand.

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ART300A Service Manual
Rear Panel
1. INPUT is a balanced XLR input jack that
accepts mic-level or line-level signals.
2. OUTPUT is a balanced XLR output jack in
parallel with the INPUT jack, allowing the
signal to “loop through” for daisy-chaining
speakers together.
3. LINE/MIC switch for mic-level or line-level
signals at the INPUT.
4. VOICE equalization switch ON provides a
gentle boost at 3kHz and 6kHz.
5. MUSIC equalization switch ON provides a
low-frequency and high-frequency boost.
6. LIMITER indicator illuminates when the limit-
ing protection circuits are activated.
7. OPERATE indicator illuminates when the
POWER switch is turned on.
8. VOLUME control adjusts the input-stage
gain.
9. POWER switch turns the AC power on and
off.
10. AC OUTLET for connecting AC power to
an additional Mackie Industrial active
speaker system.
11. Grounding Terminal provides an additional
safety grounding point.
12. IEC AC Socket. Connect the detachable
power cord to the socket. The protection
fuse is also contained in the AC socket.
CAUTION: Replace fuse only with the same
type as indicated on the rear panel.
Connections
The XLR connectors use the following AES
standard:
Pin 1 = Ground (Shield)
Pin 2 = Hot (+)
Pin 3 = Cold (–)
1
2
4
5
3
8
10 912 11
7
6

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ART300A Service Manual
Specifications
System:
Freq. Range (–10 dB):
55Hz-19kHz
Freq. Response (±3 dB):
75Hz-16kHz
Horz. Coverage Angle (–6 dB):
90°, averaged 1kHz-10kHz
Vert. Coverage Angle (–6 dB):
70°, averaged 1kHz-10kHz
Directivity Factor Q (DI):
10.0 (10.0), averaged 1kHz-10kHz
System Sensitivity1:
101 dB, 1W@1m
Rated Maximum SPL2:
126 dB @ 1 m (3.3ft) peak
HF Protection:
Dynamic
Transducers:
Low Frequency:
12" (300 mm) diameter woofer
High Frequency:
1" (25 mm) compression driver, horn loaded
Preamp and Processor:
Input Sensitivity:
Mic In: 8mV
Line In: 125mV
Input Impedance:
Mic In: 650Ωunbalanced
1.3kΩbalanced
Line In: 10kΩunbalanced
19kΩbalanced
Crossover Frequency and Slope:
1.8kHz; 24 dB/octave
Time Alignment:
Analog, 0.3 ms HF delay
Speaker Protection:
Thermal, over-excursion
Music Equalization:
+4.3 dB @ 65Hz
+4.0 dB @ 12kHz
Voice Equalization:
+4.0 dB @ 3kHz
+4.0 dB @ 6kHz
Indicators:
Power ON, Limiter
Amplifiers:
LF Amplifier Power:
300 watts RMS
HF Amplifier Power:
60 watts RMS
Distortion:
< 0.1% THD at rated power
Amp Protection:
Thermal, limiter, short circuit
Power Supply:
115/230 VAC, 2A, 50/60 Hz
Physical:
Enclosure:
Asymmetrical trapezoidal, reinforced
polypropylene
Mounting:
Lockable 1-3/8" (35mm) stand mount
Rigging Inserts:
4 points, accepts M10 threaded hardware
Input/Output Connectors:
2 XLR balanced
Dimensions HxWxD:
24.4" x 15.4" x 12.3"
(620 mm x 390 mm x 312 mm)
Net Weight:
44.0 lb (20.0 kg)
Testing:
DC voltages:
+ 83 VDC
- 83 VDC
+ 41 VDC
- 41 VDC
+ 15 VDC
- 15 VDC
DC offset:
less than +/- 0.1 VDC
Bias:
At idle, into 8 ohm loads
after warm-up
adjust R36
5.5 mV R39-R40 (low freq amplifier)
adjust R73
13 mV R81-R82 (high freq amplifier)
AC current draw:
Less than 0.3 A at idle

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ART300A Service Manual
ART300A Parts
13112024 ART300A Final Assembly
PART # DESCRIPTION QUANTITY NOTES
21111060 WOOFER L12.................................................................................................1
23103350 INPUT ASSEMBLY...........................................................................................1 See page 14
23103360 AMPLIFIER ASSEMBLY...................................................................................1 See next page
23103450 ACCESSORY (FLOOR WEDGE ANTI-TIP-OVER THINGY) ............................1
23103620 WIRE ASSEMBLY............................................................................................1
25110480 TWEETER N 350..............................................................................................1
33090090 CABINET FRONT 33526.................................................................................1
33090400 CABINET REAR 34288...................................................................................1
33160530 WOOFER GASKET 21202..............................................................................1
33221060 WOOFER GRILL 31809..................................................................................1
33221130 CONTROL BOARD SHIELD 32656 ................................................................1
33890100 FEET 34287.....................................................................................................4
33901250 HANDLE 31154..............................................................................................1
33901270 WIRE CABLE GROMMET 32498....................................................................1
33912130 ANTIVIBRATION 22867..................................................................................4
33912160 TRANSFORMER SPACERS 23128..................................................................6
33921210 NUTS FOR MOUNTING INSERTS 22839.........................................................4
33921480 MOUNTING INSERTS 31832 ..........................................................................4
33921510 GRILL SPACERS 32515..................................................................................4
33921540 TWEETER MOUNTING PLATES 32655............................................................2
33921580 SPACERS 33359 ............................................................................................8
33950280 MOUNTING INSERT COVER STICKERS (HEX) 23495....................................4
33951920 TRADEMARK BADGE 34672.........................................................................1
33960580 WARRANTY MOD.1712................................................................................1
33961560 INSTRUCTION GUIDE MOD.1743.................................................................1
33993020 SHIPPING BOX 34673....................................................................................1
33994990 BOX PACKING 31914...................................................................................2
33995000 BOX PACKING 31915...................................................................................2
33995350 SHIPPING PALLET 33301......................................................................0.0833
33995360 BOX COVER 33303..............................................................................0.1666
33995370 ANGLE 1800 33302..............................................................................0.3333
33995380 BOX PACKING 33368...................................................................................2
43040390 SOUND ABSORBER FOAM SP.15 DENS.50...............................................24
43900110 STOPPER PLUG..............................................................................................1
43900580 U-SHAPED RUBBER GASKET ESPACE200..............................................0.001
43900810 KNURLED KNOB 32243.................................................................................1
43900820 GASKET 32181............................................................................................1.2
43900830 GASKET 32266..........................................................................................2.05
51180425 Screw, Hex, white galv, M6 x 18 mm, U5739 3055 ...................................2
51190205 Screw, cylindrical, Allen, black galv, M5 x 10 mm, U5931......................4
51190336 Screw, cylindrical, Allen, black galv, M6 x 35, U5931 50762...................4
51240411 Screw, cylindrical, Phillips, pointed, black galv, 3.9 x 13 mm, U6954 ....4
51992008 Screw, cylindrical, Phillips, black galv, for plastic, 4.2 x 20 mm............20
51992010 Screw, roundhead, flange, Phillips, black galv, for plastic, 4.8 x 50 mm16
52100101 Washer, flat, 15 x 28 mm, white galv, U6592 ............................................4
52100121 Washer, flat, 6.4 x 12.5 mm, black galv, U6592 0174.............................10
52201009 Washer, crinkle, 6 mm DIN6798 50383 .....................................................2
52301004 Washer, split, 6.4 mm U1751 171 1/2..........................................................2
59024072 PLASTIC BAG 600+100+100X1200...............................................................1
83483019 LINECORD, USA, C3C83-012E003...............................................................1

11
ART300A Service Manual
23103360 ART300A Amplifier Assembly 115 VAC
PART # DESCRIPTION QUANTITY NOTES
23020400 AMPLIFIER PCB ASSEMBLY...........................................................................1 See next page
23102640 WIRE ASSEMBLY UL.......................................................................................1
23102650 WIRE ASSEMBLY UL.......................................................................................2
23102660 WIRE ASSEMBLY UL.......................................................................................1
23102670 WIRE ASSEMBLY UL.......................................................................................1
23102680 WIRE ASSEMBLY UL.......................................................................................1
23102750 WIRE ASSEMBLY UL.......................................................................................1
23102760 WIRE ASSEMBLY UL.......................................................................................1
33120230 HEATSINK 32924............................................................................................1
33182100 TRANSFORMER SUPPORT 31180..................................................................1
33190190 REAR PANEL 34676.......................................................................................1
33950120 UL STICKER 33539..........................................................................................1
43900130 GROUND CONNECTOER 33610..................................................................1
43900840 BRASS SPACERS 10 MM...............................................................................4
51150316 Screw, cylindrical, Phillips, black galv, M4 x 10 mm, U7687 6233...........4
51150325 Screw, cylindrical, Phillips, white galv, M4 x 14 mm, U7687 6643.........10
51150346 Screw, cylindrical, Phillips, black galv, M4 x 25 mm, U7687....................4
51180545 Screw, Hex, white galv, M8 x 65 mm, U5737 ............................................1
51250211 Screw, flat, CSK, Phillips, blck galv, point, 2.9 x 9.5 mm, U6955 12596...4
52100113 Washer, flat, 4,3 x 9, white galv, U6592 169..............................................9
52100126 Washer, large flat, white galv, 9 x 24 mm, U6593 ....................................1
52100127 Washer, white galv, 8.5 x 32 mm, 166.......................................................1
52201003 Washer, crinkle, 4 mm DIN 6798-A.............................................................2
52201005 Washer, crinkle, 8 mm DIN6798 176...........................................................1
53102010 Nut, M 4 U5588-A-6S 01880 1/2...................................................................3
53301026 Nut, NYLOCK, M8 INOX...............................................................................1
53301035 Nut, flanged, white galv, M 4 DIN 6923...................................................18
81751094 TRANSFORMER C1T51-079A........................................................................1
83111142 FUSE C3P11-003T502 5 AT............................................................................2
83242016 ILLUMINATED POWER SWITCH C3S42-016 .................................................1
83444023 FASTON CONNECTOR, MALE C3C44-013M001 .969/4.............................1
83482004 RECESSED SOCKET, MALE C3C82-004M003..............................................1
83482006 RECESSES SOCKET, FEMALE C3C82-006F003.............................................1
97119549 GREEN/YELLOW WIRE 1 MMQ .................................................................10
PART # DESCRIPTION NOTES
11401023 Woofer L12ART300A Boxed woofer (21111060 plus shipping box, packing etc)
11440039 Woofer Recone kit L12ART300A Boxed Recone kit
15420008 Tweeter ART 300/300A Boxed Tweeter (25110480 plus shipping box, packing)
15410084 Tweeter diaphragm M84 Boxed Tweeter diaphragm
Service Replacement Parts (boxed and packaged, ready to ship out)

12
ART300A Service Manual
23020400 ART300A Amplifier PCB Assembly
PART # DESCRIPTION QUANTITY NOTES
32030380 BARE CIRCUIT BOARD MR 31851-6.............................................................1 See pages 16-20
32180670 SUPPORT 13391.............................................................................................4
33120240 HEATSINK 32922............................................................................................1
33120250 HEATSINK 32923............................................................................................1
33910140 INSULATORS 33912.....................................................................................13
42901040 ANTISTATIC LABEL 31101..............................................................................1
51160225 Screw, flat, CSK, Phillips, black galv, M3 x 12 mm, U7688.....................18
52100105 Washer, flat, 3,2 x 7, white galv, U6592 5320............................................8
52201002 Washer, crinkle, 3 mm DIN 6798 11628 1/2.............................................18
53101005 Nut, M 3 U5588-A-6S 11625......................................................................18
81121000 RESISTOR, C1R21-251J0R0 1/4W5% 0 .......................................................66
81121001 RESISTOR, C1R21-251J010 1/4W5% 1..........................................................2
81121017 RESISTOR, C1R21-251J220 1/4W5% 22........................................................4
81121021 RESISTOR, C1R21-251J470 1/4W5% 47........................................................4
81121025 RESISTOR, C1R21-251J101 1/4W5% 100....................................................12
81121032 RESISTOR, C1R21-251J391 1/4W5% 390......................................................4
81121033 RESISTOR, C1R21-251J471 1/4W5% 470......................................................2
81121034 RESISTOR, C1R21-251J561 1/4W5% 560......................................................6
81121037 RESISTOR, C1R21-251J102 1/4W5% 1K .......................................................9
81121040 RESISTOR, C1R21-251J182 1/4W5% 1.8K ....................................................6
81121041 RESISTOR, C1R21-251J222 1/4W5% 2.2K ..................................................24
81121042 RESISTOR, C1R21-251J272 1/4W5% 2700....................................................1
81121043 RESISTOR, C1R21-251J332 1/4W5% 3.3K ....................................................3
81121045 RESISTOR, C1R21-251J472 1/4W5% 4.7K ....................................................5
81121047 RESISTOR, C1R21-251J682 1/4W5% 6.8K ....................................................2
81121049 RESISTOR, C1R21-251J103 1/4W5% 10K ...................................................17
81121051 RESISTOR, C1R21-251J153 1/4W5% 15K .....................................................1
81121055 RESISTOR, C1R21-251J333 1/4W5% 33K .....................................................1
81121057 RESISTOR, C1R21-251J473 1/4W5% 47K .....................................................5
81121058 RESISTOR, C1R21-251J563 1/4W5% 56K .....................................................1
81121063 RESISTOR, C1R21-251J154 1/4W5% 150K ...................................................3
81121064 RESISTOR, C1R21-251J184 1/4W5% 180K ...................................................2
81121065 RESISTOR, C1R21-251J224 1/4W5% 220K ...................................................1
81121069 RESISTOR, C1R21-251J474 1/4W5% 470K ...................................................1
81121070 RESISTOR, C1R21-251J564 1/4W5% 560K ...................................................1
81121071 RESISTOR, C1R21-251J684 1/4W5% 680K ...................................................1
81121073 RESISTOR, C1R21-251J105 1/4W5% 1M......................................................5
81121079 RESISTOR, C1R21-501J2R7 1/2W5% 2.7 ...................................... 1/2 watt 4
81121114 RESISTOR, C1R21-501J222 1/2W5% 2.2K .................................... 1/2 watt 2
81121166 RESISTOR, C1R21-251J106 1/4W5% 10M....................................................1
81121734 RESISTOR, C1R21-251F1002 1/4W1% 10K ..................................................8
81121859 RESISTOR, C1R21-251F2003 1/4W1% 200K .................................................1
81127275 RESISITOR, FUSIBLE, C1R27-162K470 1.6W10% 47.......................................2
81138033 RESISTOR, HIGH VOLTAGE C1R38-501J475 1/2W5% 4.7M........................1
81182007 TRIM POT C1R82-001K102 1K.......................................................................2
81231011 RESISTOR, WIRE WOUND, C1F31-202J2R2 2W 5% 2.2................................2
81241118 RESISTOR, WIRE WOUND, C1F41-302K472 3W10% 4.7K............................2
81241125 RESISTOR, WIRE WOUND, C1F41-502JR15-RES.FILO 5W5% 0.15...............2
81241152 RESISTOR, WIRE WOUND, C1F41-502J4R7-RES.FILO 5W5% 4.7.................2
81241219 RESISTOR, WIRE WOUND, C1F41-502K100-RES.FILO 5W10% 10................2
81243129 RESISTOR, WIRE WOUND, C1F43-502JR33-RES.FILO 5W5% 0.33...............2
81412018 CAPACITOR, FILM, C1C12-101K684 100V10%680N..................................2
81413001 CAPACITOR, FILM, C1C13-101K102 100V10% 1N.....................................4
81413007 CAPACITOR, FILM, C1C13-101K103 100V10% 10N...................................4
81413009 CAPACITOR, FILM, C1C13-101K223 100V10% 22N...................................6
81413010 CAPACITOR, FILM, C1C13-101K333 100V10% 33N...................................2
81413011 CAPACITOR, FILM, C1C13-101K473 100V10% 47N...................................1

13
ART300A Service Manual
PART # DESCRIPTION QUANTITY NOTES
81413013 CAPACITOR, FILM, C1C13-101K104-COND.FILM100V10% 100N...........17
81413017 CAPACITOR, FILM, C1C13-630K683-COND.FILM63V10% 68N.................2
81413022 CAPACITOR, FILM, C1C13-630K474-COND.FILM63V10% 470N...............2
81421007 CAPACITOR, CERAMIC, C1C21-500K100 50V10% 10 P ...........................4
81421013 CAPACITOR, CERAMIC, C1C21-500K330 50V10% 33P ............................1
81421017 CAPACITOR, CERAMIC, C1C21-500K680 50V10% 68 P ...........................2
81421019 CAPACITOR, CERAMIC, C1C21-500K101 50V10% 100 P .........................1
81421023 CAPACITOR, CERAMIC, C1C21-500K221 50V10% 220P ..........................1
81422010 CAPACITOR, CERAMIC, C1C22-500*681 50V10% 680P...........................2
81521034 CAPACITOR, ELECTROLYTIC, C1E21-160*220 16V 22U.............................2
81521045 CAPACITOR, ELECTROLYTIC, C1E21-250*2R2 25V 2.2U............................1
81521046 CAPACITOR, ELECTROLYTIC, C1E21-250*4R7 25V 4.7U............................1
81521051 CAPACITOR, ELECTROLYTIC, C1E21-250*221 25V 220U...........................2
81521072 CAPACITOR, ELECTROLYTIC, C1E21-630*010 63V1U................................3
81521075 CAPACITOR, ELECTROLYTIC, C1E21-630*100 63V10U..............................2
81521078 CAPACITOR, ELECTROLYTIC, C1E21-630*101 63V100U............................2
81533020 CAPACITOR, ELECTROLYTIC, C1E33-500*682 50V 6800U.........................4
81632055 INDUCTOR C1L32-040A331.........................................................................2
82112001 DIODE C2D12-750*151 1N4148.................................................................29
82112002 DIODE C2D12-201*251 BAV21....................................................................4
82131013 ZENER DIODE C2D31-132J120 1.3W 12V....................................................4
82131015 ZENER DIODE C2D31-132J150 1.3W 15V....................................................1
82172010 DIODE C2D72-102*102 1N4007.................................................................12
82172012 DIODE C2D72-401*312 MR854....................................................................2
82175010 DIODE BRIDGE C2D75-211*402 4A............................................................2
82212002 TRANSISTOR C2T12-101B450 BC560/C.......................................................5
82212017 TRANSISTOR C2T12-600B150 2N5401..........................................................5
82212018 TRANSISTOR C2T12-600A160 2N5551..........................................................5
82212019 TRANSISTOR C2T12-101C450 BC550...........................................................7
82222007 TRANSISTOR C2T22-302A800 BD179 ...........................................................1
82222008 TRANSISTOR C2T22-302B800 BD180............................................................1
82222011 TRANSISTOR C2T22-101A301 BF871 ............................................................1
82222012 TRANSISTOR C2T22-101B301 BF872.............................................................1
82231022 TRANSISTOR C2T31-802A151 MJE15030.....................................................1
82231023 TRANSISTOR C2T31-802B151 MJE15031......................................................1
82231028 TRANSISTOR C2T31-153B231 2SC5200........................................................1
82231029 TRANSISTOR C2T31-153A231 2SA1943........................................................1
82232003 TRANSISTOR C2T32-253A400 TIP35..............................................................1
82232004 TRANSISTOR C2T32-253B400 TIP36..............................................................1
82242007 TRANSISTOR C2T42-502A800 TIP126............................................................1
82242008 TRANSISTOR C2T42-502B800 TIP121............................................................1
82262005 TRANSISTOR C2T62-800A250 J108 ..............................................................2
82262014 MOSFET TRANSISTOR C2T62-313A101 IRFP140...........................................1
82262015 MOSFET TRANSISTOR C2T62-193A101 IRFP9140.........................................1
82312004 INTEGRATED CIRCUIT C2A12-15534 NE5534..............................................1
82312005 INTEGRATED CIRCUIT C2A12-25532 NE5532..............................................9 SEE NOTE BELOW
82512008 LED GREEN C2F12-008.................................................................................4
82561001 OPTOCOUPLER C2F61-001*5C8 VTL ..........................................................1
83111049 FUSE C3P11-001F252 2.5AF..........................................................................2
83111053 FUSE C3P11-001F632 6.3 AF.........................................................................2
83142005 CAPACITOR, FILM, C3P42-251K224 250V10% 0.22....................................1
83144013 CAPACITOR, CERAMIC, C3P44-250M103M 250V20% 10N......................1
83182005 FUSEHOLDER C3P82-005..............................................................................4
83432031 CONNECTOR 10 PIN, C3C32-012M010 10P...............................................1
83432033 CONNECTOR 6 PIN, C3C32-012M006 6P...................................................1
83444020 FASTON MALE CONNECTOR C3C44-020M001.......................................18
83811002 INSULATOR STRIP C3A11-002.......................................................................3
83811009 INSULATOR STRIP C3A11-009.......................................................................3
83812001 INSULATING WASHER C3A12-001 ...............................................................3
FROM NOV 2002: 82312005 I.C.NE5532 has been replaced with 0004634 NJM4580

14
ART300A Service Manual
23103350 Input Assembly
PART # DESCRIPTION QUANTITY NOTES
22040930 WIRE ASSEMBLY POWER .............................................................................1
23020360 INPUT PCB ASSEMBLY...................................................................................1 SEE BELOW
23102780 WIRE ASSEMBLY UL.......................................................................................1
33170050 COVER PLATE 34675....................................................................................1
51240211 Screw, cylindrical, blck galv, point, 2.9 x 9.5 mm, U6954 12600 1/2......4
83881020 KNOB C3A81-020.........................................................................................1
83882016 BLACK BUTTONS C3A82-016 .......................................................................3
23020360 Input PCB Assembly
See the schematic on page 21, PCB layout on page 22
PART # DESCRIPTION QUANTITY NOTES
33032120 BARE CIRCUIT BOARD MR 31850-3.............................................................1 SEE PAGES 21-22
52201005 WASHER 8 DIN6798 176...............................................................................1
81121025 RESISITOR C1R21-251J101 1/4W5% 100......................................................2
81121030 RESISITOR C1R21-251J271 1/4W5% 270......................................................1
81121033 RESISITOR C1R21-251J471 1/4W5% 470......................................................1
81121034 RESISITOR C1R21-251J561 1/4W5% 560......................................................2
81121037 RESISITOR C1R21-251J102 1/4W5% 1K........................................................2
81121041 RESISITOR C1R21-251J222 1/4W5% 2.2K.....................................................1
81121049 RESISITOR C1R21-251J103 1/4W5% 10K......................................................3
81121051 RESISITOR C1R21-251J153 1/4W5% 15K......................................................1
81121061 RESISITOR C1R21-251J104 1/4W5% 100K....................................................1
81121073 RESISITOR C1R21-251J105 1/4W5% 1M ......................................................4
81132089 RESISITOR, METAL, C1R32-501G473 1/2W2% 47K......................................4
81311074 POT, C1P11-063A503-POTENZIOMETRO 50K..............................................1
81413001 CAPACITOR, FILM C1C13-101K102 100V10% 1N......................................2
81413005 CAPACITOR, FILM C1C13-101K472 100V10% 4.7N...................................2
81413007 CAPACITOR, FILM C1C13-101K103 100V10% 10N....................................1
81413013 CAPACITOR, FILM C1C13-101K104 100V10% 100N..................................1
81421013 CAPACITOR, CERAMIC C1C21-500K330 50V10% 33P .............................2
81421015 CAPACITOR, CERAMIC C1C21-500K470 50V10% 47 P ............................2
81521075 CAPACITOR, ELECTROLYTIC C1E21-630*100 63V10U...............................2
81572003 CAPACITOR, BIPOLAR C1E72-350*222 BPM 35VDC20% 2.2U..................1
82112001 DIODE C2D12-750*151 1N4148...................................................................4
82312005 INTEGRATED CIRCUIT C2A12-25532 NE5532..............................................2
82511006 LED, RED C2F11-006.....................................................................................1
82512008 LED, GREEN C2F12-008................................................................................1
83231021 DOUBLE SWITCHES C3S31-0210202............................................................3
83414019 MALE XLR CONNECTOR C3C14-017M003 3P............................................1
83414020 FEMALE XLR CONNECTOR C3C14-017F003 3P .........................................1
83432033 6-PIN CONNECTOR C3C32-012M006.........................................................1
83822029 TIE DOWN C3A22-029..................................................................................1
97123005 YELLOW WIRE 1.5 MMQ...............................................................................8

15
ART300A Service Manual
23102460 RCF ART300A Input Assembly
These parts differ from the Mackie ART300A input assembly:
PART # DESCRIPTION QUANTITY NOTES
33170820 INPUT BOARD COVER PLATE 33270............................................................1
13110049 RCF ART300A Final Assembly
These parts differ from the Mackie ART300A final assembly:
PART # DESCRIPTION QUANTITY NOTES
23102060 ACCESSORY (ANTI-TIP OVER WEDGE).......................................................1
23102460 INPUT ASSEMBLY...........................................................................................1 See below
23102900 AMPLIFIER ASSEMBLY115V...........................................................................1 See below
32970150 BOX LABEL 31167 .........................................................................................2
333950530 SERIAL NUMBER LABEL50487.......................................................................3
33955180 RCF TRADEMARK BADGE 32180.................................................................1
33960330 INSTRUCTION GUIDE MOD.1630-2..............................................................1
33994980 SHIPPING BOX 31916....................................................................................1
23102900 RCF ART300A Amplifier Assembly
These parts differ from the Mackie ART300A amplifier assembly:
PART # DESCRIPTION QUANTITY NOTES
33191290 REAR PANEL 33543.......................................................................................1
33955480 CAUTION LABEL 32650.................................................................................1
RCF ART300A parts
Summary of Differences
The main differences between the RCF brand and the Mackie brand ART300A are:
the rear panel silkscreens, the front badges, the shipping boxes and literature.
The following parts are used in the RCF brand ART300A US model. The other parts, not
shown, are the same as the Mackie model.

ART300A Service Manual
16
R126 2K2 R127 2K2
R129 100K
Q29
BC560
1
2
Q30 BC550
2
Q31
BC550
2
Q32 BC550
2
R131
1M
D39
R130 3K3
R128
100
+15V
-15V
1
3
1
1
3
3
NOTE: ALL DIODES NOT SPECIFIED ARE 1N4148
3
R104
10K
C47 470n
R105
100
R119 10K
R120 10K
R121 10K
R122 1M
R123 1M R124 1M
R125 1M
R132 10K
R134 10K
R136
10K
R137 220K
R98
M68
C51 4u7
+D33
D34 D35
D36
D37
D38
C42 680n
C48 680n
C50
10u
+
IC6A
NE5532
3 21
+ -
+15V
-15V
4
8
R96 10K
R97 100
C41
1u
+
ISO1 R999
1K R99 10K
C44 33n
R100 1K8 1
IC6B
NE5532
5 67
+ -
IC8
MC34001P
3 26
+ -
+15V
-15V
-15V
4
4
71
5
R107 10K 1%R108
10K 1%
R109
10K 1%
R110 10K 1%
R112
10K 1%
R113 10K 1%
R114 1K R115 1K
R135 1K
C55 22n C56
22n C57
22n
IC4A
NE5532
2 31
IC5B
NE5532
6 57
IC5A
NE5532
2 31
R138 150K
+15V +15V +15V
-15V -15V -15V
4
8
4
8
4
8
R111
10K 1%
R116 1K
C49 100n
IC9A
NE5532
2 3
1
IC9B
NE5532
6 5
7
IC10B
NE5532
6 5
7
IC10A
NE5532 2
3
1
IC4B
NE5532
R133 10K
+15V
+15V
+15V
+15V
-15V -15V
-15V
-15V
8 44
8
8
44
8
R117 2K7
R102 1K8 R103 1K8
C46 33n
R106
10K 1%
R118 47K
C54
1u
+
C58 22n
IC7B
NE5532
5 67
+
-
6 57
+15V
-15V
-15V
LOW
4
8
4
8
IC7A
MC34001P
3 21
+ -
-15V
4
R87 4K7 R88 4K7
R92 10K
C37 10n C38 22n C39 22n
C43 68n
R101 1K8
R90 3K3
IC2A
NE5532
3 21
+
-
IC2B
NE5532
5 6
+
-
+15V +15V
+15V
-15V
-15V 4
8
8
4
8
7
C45 68n
+15V
HIGH
R89 4K7
R93 10K
C34 220p
R94 10K
C36 10n
R95 3K3
D40 D41
C52 10n
C53 10n
C40 2u2
+
R91
10K
IC3B
NE5532
5 67
+
-
IC3A
NE5532
3 21
+
-
+15V
+15V
-15V
-15V
4
4
8
8
+15V
8
C35 1u
+
CON1
1 2 3 4 5 6 7 8 9
10
-15V-5V
+5V
+15V
-
1234
A
B
C
D
12345678
Sheet 4 of 5
SE031851
ART300A Final Filter 31/01/1997
C D B
5678
A
ART 300A Low/High Crossover

ART300A Service Manual
17
D22
1N4007
D30
1N4007
D31
1N4007
R67 2K2
+15V
R56 2K2
2
DL3 LED
D24
R54 2K2
Q17 2N5551
R57 6K8
C30 33p
R59 2K2 Q16 2N5401
R55 2K2
R58 2K2
D23
2
DL4 LED
3
D26
R82
0.33
5W
Q23 TIP35C
2
3
R77
Q27 BD179
2 1
R72 22
2R7
1/2W
R80
2K2 1/2W
R76 47
R69
1K
R62 100
R68
470
D25
Q21
BC550
Q20 BC550
C26
100n
R74 1K8
2
R65
560
R73
1K
3
R60 2K2 390
D29
C31 10p
D28 Q19
2N5551
2
Q24 2N5401
3
3
1
R70
1K
R81
0.33 5W
Q26
BC560 2
2
R79
2K2 1/2W
1
3
3
1C33
47n
C29
100n
R86 10
5W
CF3 CF4
L2 4uH
R84
10
3W
F4 2.5AT
-40V
OUT HIGH
R66 100
D32
R71 22
Q22 TIP36C
1
Q18 2N5401
2
3
R75
2R7
1/2W
Q28 BD180
31
2
1
3
2
R63 2K2 R64
390
D27 C32 10p
Q25 2N5551
2
-15V 3
1
C21
1n R50
47K
R51 2K2
C25 68p
R85 560
R52 560
R78 15K
R53 10K
C27 100u
1
+
C23 100n
C24
100n
IC1B
MC34002P
6 5
SIGN A2
HIGH 8
4
7
R83 47K
C28 100n
F3 2.5AT
+40V
- ALL DIODES NOT SPECIFIED ARE 1N4148
Sheet 3 of 5
SE031851
ART300A FINAL HIGH
5678
C D B A
56782341
A B C D
1234
R61
ART 300A High Frequency Amplifier

ART300A Service Manual
18
R5 2K2
C7 100p
R9 R10 2K2
R11 390
R12 100
R15 560 R21
1K
D4
D5
D6
D9 D10
BAV21
R37 1K8
R48 6K8
Q15
BF872
Q7 MJE15030
560
Q2 2N5551
Q4 2N5551
Q6
BC550
DL1 LED
DL2
C8 100n
C11
100n
R18 2R2 3W
C10 10p
R17 2K2
Q13
BC550
R36
1K
D1
1N4007
D11
1N4007
D12
1N4007
+15V R20
470
R22
1K
R23 2K2
R35 22
R39 0.15
5W
R40 0.15
5W
R44 47
Q12
IRFP140
Q9 2SC3281
DZ312V
R45
2R7 1/2W
F1 6.3AT
R7 2K2
R25
47
R26 100
C16 680p
R29 4K7
3W
C19 22u 16V
C12 1n
D14
D16 BAV21
R31 150K
R42
D21 MR854
+
DZ1 12V
D3
1N4007
D18
D19
R38 180K
180K
C14100n
R33
4R7 5W
R46 4R7 5W
CF2 CF1
L1 4uH
+80V +40V
OUT
LOW
R27 100
R28 47 D2
1N4007
C13
1n
D15 BAV21
D17
R32 150K
C18 680p
D20 MR854
Q11
IRFP9140
Q10 2SA1302
C15 22u 16V
+
R30 4K7
3W
DZ2 12V
DZ4
12V
F2 6.3AT
-80V -40V
R16 100
R24 2K2
D13
R34 22
Q8
MJE15031
Q3 2N5401
C20 100n
R19 2R2 3W
R43
2R71/2W
R6 2K2
R8 2K2 2K2
C9
10p
R13 2K2 R14
390
D7 BAV21
D8
Q14
BF871
Q1 2N5401
Q5
BC560
LED
-15V
C1
1n R1
47K R2 47K
R47
R49 560
C17 100u
+
C4
100n
C2 100n
IC1A
MC34002P
SIGN A1
R3 2K2
R4
C3 100n
2 31
4
8
10K
C6 68p
R41 33K
C5 100n
- ALL DIODES NOT SPECIFIED ARE 1N4148
LOW
A B C D
12345678
Sheet 2 of 5
SE031851
ART300A FINAL LOW
A B C D
67834512
ART 300A Low Frequency Amplifier

ART300A Service Manual
19
C63 10n R139
4.7M
D46 1N4007
D47 1N4007
D48 1N4007
D49 1N4007
CF18
LM1 LM7905
VIN
3
GND
VOUT
LM2 LM7805
VIN
1
GND
VOUT 2
+40V
+80V +40V -40V -80V
-5V +5V
1
3
C59 6800u 50V
+
C60 6800u 50V
+
C61 6800u 50V
+
C62 6800u 50V
+
DB2 GBU4D
1
-
2
3
4
100
2
2
3
3
R152
100 1,6W
Q33 TIP121R148
2K2
R149
R147 4K7
C68
220u
16V
+
R146 1
C69
10u
C65 100n
2
+15V
1
1
A B
46785
+
D44 1N4148
+
Q36 BC560
DZ5 15V
CF10 CF11 CF12 CF13 CF14 CF15
FOR 115VAC POWER SUPPLY, CHANGE FUSE TO T 6.3A
FT6.3A
SW 115V
1 3 2
CF5 CF6 CF7 CF8 CF9
CF16
CF17
TR
SW
C22 220n
C
C
0V 60Vac 30Vac 30Vac 60Vac
CF14 CF13 CF12 CF11 CF10 CF15
CF16
CF17
TR
1 2
5 7 8 6 9
3 4
SW
SW
230V
1 3 2
C22 220n
C
C
F T2.5A
60Vac 30Vac 0V
30Vac 60Vac
CF9 CF8 CF7 CF6 CF5
DB1 GBU4D
2
1
3
4
Q37
J108 R140 100K D45 1N4148
SIGN A1
SIGN A2
C66
470n
R150 10K
R151 2K2
C70
220u
16V
+
R145 1
R154 4K7 R144
56K
Q34
BC560
C67 100n
Q35
TIP126 -15V
Q38
J108
R153
100K
R142 10M
R141 100K
C64
100n
R143 100
-40V 1,6W
Sheet 5 of 3
SE031851
ART300A Power Supply
45678
C D
123
C D
A
B
123
ART 300A Power Supply

ART300A Service Manual
20
ART 300A Main Circuit Board 31851