Go To Bulletins M2600 FR Series Power Amplifier SERVICE MANUAL 1998, 1999 MACKIE DESIGNS, INC.
SERVICE ON THIS EQUIPMENT IS TO BE PERFORMED BY EXPERIENCED REPAIR TECHNICIANS ONLY 2
Click on any item to open that page CONTENTS INTRODUCTION ................................................................................. 3 Technical Support ........................................................................ 3 Disclaimer ....................................................................................... 3 BLOCK DIAGRAM ............................................................................. 4 SPECIFICATIONS ..................................................................
MACKIE DESIGNS M•2600 BLOCK DIAGRAM 9/21/1998 THRU OUTPUT (XLR-MALE) LINE INPUT (XLR-FEMALE) LINE INPUT (1/4" TRS) THRU OUTPUT (XLR-MALE) LINE INPUT (XLR-FEMALE) LINE INPUT (1/4" TRS) FUSE LOW CUT FILTER FREQ LOW CUT FILTER FREQ LAMP POWER SWITCH TRANSFORMER THERMAL IN-RUSH LIMIT HIGH LOW 60-90-120Hz CROSSOVER THRU–LOW–HIGH CH 2 SIG HIGH LOW 60-90-120Hz CROSSOVER THRU–LOW–HIGH CH 1 SIG CH–2 TOROIDAL POWER TRANSFORMER IN-RUSH CONTROL LIMIT–OFF-LOW OUT Σ STEREO-MONO-BRIDGED
Specifications Maximum Power at 1% THD, midband: 500 watts per channel into 8Ω 850watts per channel into 4Ω 1300 watts per channel into 2Ω 1700 watts into 8Ω bridged 2600 watts into 4Ω bridged Continuous Sine Wave Average Output Power, both channels driven: 425 watts per channel into 8Ω from 20Hz to 20kHz, with no more than 0.025% THD 700 watts per channel into 4Ω from 20Hz to 20kHz, with no more than 0.05% THD 1000 watts per channel into 2Ω from 20Hz to 20kHz, with no more than 0.
Troubleshooting Tips-output failures After a catastrophic failure, it is likely that some of the supply fuses will be blown. Check and replace any fuses on the 129, 130, 133, and 171 boards. Short across the Left most lead of R1 to the right most lead of R2 on the 133 board to short out the two 15W inrush resistors (see the diagram on the next page). Very slowly bring up the Variac while monitoring line consumption. It is likely that substantial line current will be pulled due to shorted output parts.
Various test points 170 board (Bias and check points) R146 Q24 Q25 R151 MUTE-VA J18 SOA POWER J19 -15V-AMP SOA TRANSIENT AMP BIAS OUT TEST BIAS ADJUST ADD A TEMPORARY SHORT (SEE TROUBLEHOOTING TIPS) 133 board (inrush bypassing) 186 board (fan speed adjustment) J1 J3 J2 R1 129 channel board BR= BASE RESISTOR (2.2 OHM, 1/4W FUSIBLE) ER= EMITTER RESISTOR (0.
Reliability Verification Procedure After the unit has been repaired, the following should be done to assure long term reliable operation. If a distortion analyzer is present, distortion specifications should be verified. See the previous page for the 170 and 186 boards with some test points noted. 1. Adjust the bias control (R163 on 170 Board) in both channels for 12mV +/- 1mV measured at the bias test points (J23 along 170 board back edge) after unit has idled for a few minutes.
. Place the amplifier in bridge mode and connect 4Ω loading to the bridge outputs (across both “+” output binding posts). The 4Ω dummy load should have a minimum power rating of 2000W. Slip some card stock between the heatsink-outlets and chassis sides to temporarily restrict the airflow. Monitor one of the outputs and adjust for a 60V pk/pk signal. Short across both outputs and verify that all four ‘Short” and “Protect” LEDs light and the amplifier mutes for 5 seconds. 10.
Circuit Theory Much of the circuitry in the M•2600 we hope is self explanatory from the schematics. This section will explain the unique circuits and architecture. Examples in this section will refer to Channel 1 for circuitry that is identical on both channels. INPUT CIRCUITRY The signal path begins with the INPUT BOARD (055-131-00). Following Channel 1’s input, signal is fed to a unity gain differential op-amp, U1A. The signal is next sent to U1B which serves as a 12dB/Oct. highpass filter.
that float along with the amplifier output line (D3 & D4 and associated parts on the 129 board). Common +/-15V supplies are shared throughout the product. Referring now to the 170 schematic: The amplifier is muted for 3 seconds on power up as C29 charges via R56. When this voltage has charged above 11.6V, U3C goes low turning on Q7, providing current for the differential pairs. The output of U3C, labeled “MUTE-VA”, when low turns on the Voltage Amplifier.
SOA protection There are two SOA detectors in the M-2600: One that monitors steady state output stage dissipation and one that monitors transient high current events. Both detectors need to monitor the output stage current. A voltage, representing output stage current, is derived by first sampling the voltage drop across the output transistor emitter resistors. These voltages are rectified via U9A R87, R88, R59 and R89. The rectified voltage is converted to a current via U9B, Q23, and associated.
via R33 and R8 and compared against the 5V reference at U3A. If the AC line voltage falls to around 60% of nominal (around 70VAC), the output of U3A goes low, resetting the mute and short monostables via D5 and D12. If the +15V supply fails, D3 and D4 bias the U3A inputs such that the amplifier is also muted. In the event of the -15V supply failing, R7 is no longer able to pull the anode of D15 low, and this also causes U3A to go low and mute the amplifier.
The circled item numbers are shown in the parts list on page 20 Final Assembly 14
The circled item numbers are shown in the parts list on page 20
The circled item numbers are shown in the parts list on page 20 Final Assembly
The circled item numbers are shown in the parts list on page 21 Amplifier/Heatsink Assembly
The circled item numbers are shown in the parts list on page 21 Amplifier/Heatsink Assembly
The circled item numbers are shown in the parts list on page 21 Amplifier/Heatsink Assembly
Master Parts List 090-078-00 M2600 Assembly, 120v Item# Part # 1 2 3 5 6 7 8 9 10 11 12 13 23 15 16 17 18 19 20 21 46 22 49 31 24 25 26 27 30 32 34 35 33 29 36 37 38 39 40 41 47 48 49 42 53 43 44 45 20 040-257-00 040-272-00 040-273-00 040-301-00 055-131-00-01 055-132-00-01 055-133-00-01 055-171-00-01 055-172-00-01 080-076-00 080-087-10 080-087-20 080-115-00 080-117-00 400-331-00 400-332-00 500-022-00 510-044-00 550-245-00 550-246-00 550-370-00 550-371-00 550-376-00 550-378-00 550-419-00 551-029-40 640-0
Item# Part # 790-022-00 800-087-00 800-107-00 810-076-00 810-082-00 820-078-00 Description Rev POLY-SHEET 52CF X 26 4MIL A BOX - M2600 A BOX SLEEVE M2600 A INSERT - M2600 A FOAM CORNER M2600 A OWN MANUAL M2600 ENG/DOM Qty 1 1 1 2 4 A 1 080-076-00 Amplifier/Heatsink subassembly Item Part# 1 2 3 5 34 33 7 8 9 10 11 12 13 14 15 16 17 18 19 20 22 23 24 25 33 26 27 29 30 080-076-00 040-263-00 055-129-00-01 055-130-00-01 055-170-00-02 055-186-00-01 080-116-00 410-013-00 410-014-00 550-368-00 550-372-00 550-
055-129-00 Rev A Channel 1 board Part # Description Value Reference Designator 040-261-00 040-262-00 040-265-00 040-266-00 040-267-00 040-268-00 121-077-00 123-013-00 123-045-00 123-056-00 123-125-00 150-009-00 RIB 28GA TRAN 10C .1 3IN RIB 28GA TRAN 40C 3IN DIS 14GA BLK/ WHT 4.5IN QD DIS 14GA BLK/ WHT 6IN QDX2 DIS 14GA WHT 6IN QDX2 DIS 14GA BLKWHT 6IN QDX2 RESISTOR MOF RESISTOR MOF RESISTOR MOF RESISTOR MOF RES MO 3W 5% 15K OHM RES FUS .25W 5% 2.2 OHM 150 0.33 6.8 20 15K 2.
055-130-00 Rev A Channel 2 board Part # Description 040-262-00 040-269-00 040-270-00 121-077-00 123-013-00 123-045-00 123-056-00 123-125-00 150-009-00 RIB 28GA TRAN 40C 3IN DIS 14GA RED 6 IN QDX2 DIS 14GA BLKRED 6IN QDX2 RESISTOR MOF RESISTOR MOF RESISTOR MOF RESISTOR MOF RES MO 3W 5% 15K OHM RESISTOR, FUSABLE, 1/4W 150 0.33 6.8 20 15K 2.2 5% 5% 5% 5% 5% 5% 150-037-00 RES FUS .
055-131-00-01 Rev A Input board Part # Description 040-258-00 040-259-00 040-260-00 100-027-00 130-062-02 140-078-00 140-082-00 140-089-00 140-090-00 140-095-00 140-123-00 145-318-00 145-331-00 145-346-00 145-389-00 145-397-00 DO NOT STUFF RIB 28GA TRAN 20C .1 5IN RIB 28GA TRAN 20C .1 6IN RIB 28GA TRAN 20C .1 20IN RESISTOR CF RES POT 12MM HORIZ DUAL RESISTOR TF SMT RES TF SM .1W 5% 2K4 OHM RESISTOR CF RES TF SM .1W 5% 5K1 OHM RES TF SM .1W 5% 8K2 OHM RES TF SM .
055-132-00-01 Rev A Display board Part # Description Value 130-070-00 140-057-00 140-065-00 140-068-00 140-076-00 140-081-00 140-083-00 140-087-00 140-092-00 140-094-00 140-106-00 145-389-00 145-454-00 145-472-00 145-480-00 145-527-00 145-547-00 212-001-00 212-025-00 220-002-02 220-014-00 300-003-00 304-070-02 304-071-02 311-002-00 320-012-00 323-002-00 400-077-00 450-132-00 706-033-08 RESISTOR POT 9MM HORIZ 5KB 20% RESISTOR CF 220 5% RESISTOR CF 470 5% RESISTOR TF SMT 620 5% RESISTOR CF 1K3 5% RESISTOR
055-133-00-01 Rev A Power distribution 120V Part # Description 040-137-00 121-077-00 125-020-00 200-023-00 200-024-00 301-009-00 400-129-00 400-173-00 400-173-00 DIS 18GA GN/YL 96IN QD LUG RESISTOR MOF 150 5% RESISTOR WIRE WOUND 82 5% CAPACITOR, POLY BOX .001uF 20% CAPACITOR, POLY BOX .01uF 20% DIODE POWER 1N4004 FUSE CLIP 0.25 DIA PC MNT CONN QUICK DISC .250 CONN QUICK DISC .250 -00 AND -02 ASSY ONLY CONN QUICK DISC .250 -01 ASSY ONLY CONNECTOR,STR,3P,.
055-170-00 Rev A, Voltage amplifier and protection Part # Description Value Reference Designator 100-025-00 105-369-00 130-021-00 130-053-00 140-053-00 140-057-00 140-061-00 140-073-00 140-076-00 140-077-00 140-082-00 140-084-00 140-090-00 140-092-00 140-093-00 140-095-00 140-099-00 140-111-00 140-113-00 140-116-00 140-117-00 140-120-00 140-123-00 140-126-00 140-130-00 140-140-00 140-143-00 140-147-00 140-152-00 145-000-00 145-182-00 145-266-00 145-308-00 145-318-00 145-331-00 145-389-00 TEST POINT, PA
055-170-00 Rev A, continued Part # Description Value 200-011-02 200-036-02 205-006-02 210-017-02 212-001-00 212-006-00 212-007-00 CAPACITOR MYLAR T&R CAP, METALIZED POLY, T/R MICA 30PF 5% 500V T/A CAPACITOR, CERAMIC, T/R CER .01UF 10% 50V X7R SM CAPACITOR CERAMIC SMT CAPACITOR CERAMIC SMT 0.0022 .1uF 30pF 470pF 0.01 470PF 0.047 5% 10% 5% 5%/Y5E 10% 5% 5% 212-008-00 212-016-00 212-018-00 212-019-00 212-025-00 212-029-00 220-001-02 220-004-02 220-014-00 300-003-00 CER .
055-171-00-01 Rev A Power supply board Part # Description Value Reference Designator 100-077-00 123-109-00 150-037-00 200-036-02 211-009-00 220-006-00 220-029-00 220-041-00 300-001-00 301-009-00 301-010-00 301-015-00 310-007-00 400-060-00 400-133-00 400-173-00 RES CF .
055-186-00 Rev A 15 Volt supply/fan drive board Part # 100-031-00 100-049-00 100-056-00 100-061-00 100-066-00 100-068-00 100-069-00 100-073-00 100-078-00 100-080-00 100-090-00 100-097-00 121-081-00 130-021-00 211-009-00 220-001-02 220-027-02 300-001-00 301-009-00 310-002-00 310-024-00 310-050-00 320-011-00 321-001-00 321-002-00 400-078-00 400-171-00 450-186-00 550-369-00 601-013-00 712-021-01 30 Description Value TEST POINT, PART OF PCB RESISTOR CF 180 5% RESISTOR CF 1K 5% RESISTOR CF 2K 5% RESISTOR CF
M•2600 amplifier modification instructions Models affected: All M•2600 amplifiers with serial numbers “AU” or those less than DX10017. Add this mod as part of your normal repair procedures. Symptom: No signal, dead channel or distorted output. Possible Cause: 1: 2: Transistor Q5 on the V-amp protection boards may be shorted to an adjacent trace. Transistors Q3 and Q4 on the V-amp protection boards may oscillate under certain conditions, causing V-amp board failure, and/or failure of R57 on Ch.
THE MACKIE FIXER MACKIE DESIGNS SERVICE NEWS Amplifier Subassembly 055-170-00 V-AMP board Solder here Change R14 and R15 Cut trace here Cut trace here Change R20 and R21 Solder an insulated wire here M•2600 modification SSE July 2000 M2600mod.
