QSC audio RMX Series 2RU models Technical manual.pdf

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RMXFC_Service_Manual_Rev.pmd
RMX™ Series
2RU models
▲
RMX 850
▲
RMX 1450
▲
RMX 1850HD
▲
RMX 2450
QSC Audio Products, LLC
Costa Mesa, CA 92626 USA
www.qscaudio.com
*TD-000098-00*
TD-000098-00
Rev. D
708602682.001.png
RMX Series
Technical Service Manual
RMX 850
RMX 1450
RMX 1850HD
RMX 2450
QSC Audio Products, LLC
Technical Services Group
Phone: 1-800 QSC AUDIO (1-800-772-2834) USA only
+1 (714) 957-7150
Fax: +1 (714) 754-6173
Postal: 1665 MacArthur Blvd.
Costa Mesa, California 92626 USA
E-mail: tech_support@qscaudio.com
Web:
Copyright 2001, 2002, 2005, 2008, 2009 QSC Audio Products, LLC All rights reserved.
Document # TD-000098-00, Rev. D. Released September 2009.
RMX Series Technical Service Manual (2RU models)
1
TD-000098-00 rev. D
http://www.qscaudio.com (product information and support)
http://www.qscstore.com (parts and accessory sales)
708602682.002.png
RMX Series Performance Specifications
RMX 850
RMX 1450
RMX 1850HD
RMX 2450
OUTPUT POWER in watts
FTC: 20 Hz–20 kHz @ 0.1% THD, both channels driven
8
Ω
per channel
185
260
350
450
4 Ω per channel
280
400
550
650
EIA: 1 kHz @ 0.1% THD, both channels driven
8 Ω per channel
200
280
360
500
4
Ω
per channel
300
450
600
750
1 kHz @ 1% THD, typical, both channels driven
2 Ω per channel
430
700
900
1200
Bridge Mono:
8 Ω , 20 Hz–20 kHz, 0.1% THD
530
800
1300
8
Ω
, 1 kHz, 0.1% THD
600
900
1200
1500
4
Ω
, 1 kHz, 1% THD, typical
830
1400
1800
2400
DYNAMIC HEADROOM
2 dB @ 4 Ω
DISTORTION
SMPTE-IM
< 0.01%
< 0.01%
< 0.02%
< 0.02%
FREQUENCY RESPONSE
20 Hz–20 kHz, +0/-1 dB
(at 10 dB below rated output power)
-3 dB points: 5 Hz and 50 kHz
DAMPING FACTOR
> 300 @ 8 Ω
NOISE (unweighted 20 Hz to 20 kHz, below rated output)
100 dB
100 dB
100 dB
100 dB
VOLTAGE GAIN
31.6× (30 dB)
40× (32 dB)
46× (33 dB)
50× (34 dB)
INPUT SENSITIVITY, V RMS
full rated power @ 8
Ω
1.15v (+3.4 dBu)
1.15v (+3.4 dBu)
1.16v (+3.5 dBu)
1.23v (+4.0 dBu)
INPUT IMPEDANCE
10 k Ω unbalanced
20 k
Ω
balanced
CONTROLS
Front: AC switch, Ch. 1 and Ch. 2 gain
Rear: 10-position DIP switch
INDICATORS
POWER:
Green LED
CLIP:
Red LED, 1 per channel
SIGNAL:
Yellow LED, 1 per channel
CONNECTORS
Input:
Active balanced; XLR and ¼" (6.3 mm) TRS, tip and pin 2 positive, and barrier strip
Output:
“Touch-Proof” binding posts and Neutrik Speakon™
COOLING
Continuously variable speed fan, back-to-front air flow
AMPLIFIER PROTECTION
Full short circuit, open circuit, thermal, ultrasonic, and RF protection
Stable into reactive or mismatched loads
LOAD PROTECTION
Turn-on/turn-off muting (all models)
AC coupling
AC coupling
Triac crowbar (each channel) Triac crowbar (each channel)
OUTPUT CIRCUIT TYPE
AB
AB
H
H
AB: Class AB+B complementary linear output
H: Class AB+B complementary linear output with Class H 2-step high efficiency circuit
DIMENSIONS
19.0" (48.3 cm) wide, 3.5" (8.9 cm) tall (2 rack spaces)
15.9" (40 cm) deep (rack mounting to rear support ears)
WEIGHT Shipping:
41 lb. (18.6 kg)
46 lb. (20.9 kg)
50.5 lb. (23 kg)
50.5 lb. (23 kg)
Net:
35 lb. (15.9 kg)
40 lb. (18.2 kg)
44.5 lb. (20.2 kg)
44.5 lb. (20.2 kg)
POWER REQUIREMENTS
Available for 120 or 220–240 VAC, 50/60 Hz
POWER CONSUMPTION @ 120 VAC
(both channels driven)
T
1
F
2
M
3
T
1
F
2
M
3
Typical 1
Full 2
Max 3
T
1
F
2
M
3
I
0
A
I
0
A
Idle 0.8 A
8
I
0
A
Multiply currents by 0.5 for 230V units
8
Ω
3
A
4
A
7
A
8
Ω
3
A
5
A
1
A
Ω
3.9 A
6.9 A 12.6 A
8
Ω
4
A
9
A
1
A
4
Ω
4
A
6
A
1
A
4
Ω
6
A
9
A
1
A
Ω
6.1 A 11.2 A 20.7 A
4
Ω
6
A
1
A
2
A
8.7 A 16.6 A* 32 A*
1. Typical —Measured with pink noise signal on all channels at 1/8 of full average power. Producing peaks that occasionally reach the amp’s clipping point, this level approximates the maximum operating
level before clipping affects sound quality. These data would be the amp’s typical worst-case current.
2. Full —Measured with pink noise signal on all channels at 1/3 of full average power. Music at this level would typically produce massive clipping. In a class B amplifier, this would be the approximate
point of maximum heat production.
3. Max —Measured with continuous sine wave signal on all channels at a point of slight clipping (1% THD). This represents a “test bench” scenario and does not resemble any real-world usage.
2
Ω
6
A
9
A
1
A
2
Ω
9
A
1
A
2
A
Ω
2
Ω
9
A
2
A
4
A
US patents pending
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE
2
QSC Audio Products, LLC
4
2
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Table of Contents
RMX Series Performance Specifications ...................................................................................................................................................... 2
1. Introduction ..................................................................................................................................................................................................... 5
1.1 Restriction of Hazardous Substances Directive (RoHS) ................................................................................................................................ 5
1.2 QSC serial numbers ....................................................................................................................................................................................... 5
1.3 Service bulletins ............................................................................................................................................................................................. 5
1.4 The well-equipped service bench .................................................................................................................................................................. 6
1.5 Working with surface-mount components ................................................................................................................................................... 6
1.6 Series description .......................................................................................................................................................................................... 8
1.7 Technical descriptions and theory of operation ........................................................................................................................................... 8
2. Component identification and pinout ..................................................................................................................................................... 11
3. Troubleshooting: Symptoms, causes, & remedies ................................................................................................................................ 13
3.1 Excessive current draw ................................................................................................................................................................................ 13
3.2 Protection, muting, and turn-on/turn-off delay problems ......................................................................................................................... 13
3.3 Faults with signal present ........................................................................................................................................................................... 14
3.4 Instability ...................................................................................................................................................................................................... 14
3.5 Power supply and rail balancing problems ................................................................................................................................................. 15
4. RMX calibration procedures ...................................................................................................................................................................... 16
4.1 Setting bias .................................................................................................................................................................................................. 16
4.2 Setting positive and negative current limits .............................................................................................................................................. 16
5. Servicing RMX amplifiers ........................................................................................................................................................................... 18
5.1 Mechanical disassembly and re-assembly .................................................................................................................................................. 18
6. Replacement parts ....................................................................................................................................................................................... 19
6.1 RMX850 Replacement Parts ....................................................................................................................................................................... 19
6.2 RMX1450 Replacement Parts ..................................................................................................................................................................... 22
6.3 RMX1850HD Replacement Parts ................................................................................................................................................................. 25
6.4 RMX2450 Replacement Parts ..................................................................................................................................................................... 29
7. Schematics and diagrams .......................................................................................................................................................................... 33
7.1 RMX Assembly/Disassembly Diagram 1 of 2
(All models) ................................................................................................................................................................................................. 33
7.2 RMX Assembly/Disassembly Diagram 2 of 2
(All models) ................................................................................................................................................................................................. 34
7.3 RMX 850 Schematic Diagram 1 of 3
Channel 1 ................................................................................................................................................................................................... 35
7.4 RMX 850 Schematic Diagram 2 of 3
Channel 2 ................................................................................................................................................................................................... 36
7.5 RMX 850 Schematic Diagram 3 of 3
Power Supply ............................................................................................................................................................................................. 37
7.6 RMX 1450 Schematic Diagram 1 of 3
Channel 1 ................................................................................................................................................................................................... 38
7.7 RMX 1450 Schematic Diagram 2 of 3
Channel 2 ................................................................................................................................................................................................... 39
7.8 RMX 1450 Schematic Diagram 3 of 3
Power Supply ............................................................................................................................................................................................. 40
7.9 RMX 1850HD Schematic Diagram 1 of 3
Channel 1 ................................................................................................................................................................................................... 41
7.10 RMX 1850HD Schematic Diagram 2 of 3
Channel 2 ................................................................................................................................................................................................... 42
7.11 RMX 1850HD Schematic Diagram 3 of 3
Power Supply ............................................................................................................................................................................................. 43
7.12 RMX 2450 Schematic Diagram 1 of 4
Channel 1 ................................................................................................................................................................................................... 44
RMX Series Technical Service Manual (2RU models)
3
TD-000098-00 rev. D

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