Page 1: Service Manual
Some models may be exported under the name Amcron. ® © 1998 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-294-8000. Com-Tech amplifiers are produced by the Professional Audio Division of Crown International, Inc. Trademark Notice: SmartAmp ™...
Page 2 The information furnished in this manual does not include all of the details of design, production, or variations of the equipment. Nor does it cover every possible situation which may arise during installation, operation or maintenance. If you need special assistance beyond the scope of this manual, please contact the Crown Tech- nical Support Group.
Page 3: Table Of Contents
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Table of Contents 1 Introduction ................1-1 1.1 The Com-Tech Series ............1-1 1.2 Warranty ................1-1 2 Specifications ................2-1 2.1 Performance ..............2-1 2.2 Power ................2-1 2.3 Controls ................2-1 2.4 Indicators .................
Page 4 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual 5.6 Dual Operation ..............5-6 5.7 Bridge-Mono Operation ........... 5-6 5.8 Parallel-Mono Operation ..........5-6 6 Electrical Checkout Procedures ..........6-1 6.1 General Information ............6-1 6.2 Test Procedures ............... 6-1 6.2.1 Standard Initial Conditions ........
Page 5: Introduction
1 Introduction Each Reference Manual contains basic policies as re- lated to the customer. For further assistance please This manual contains service information for the Crown contact the Crown Technical Support Group at: Com-Tech–10 Series power amplifiers. It is designed to be used in conjunction with the Com-Tech Refer- ence Manual.
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Page 7: Specifications
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual voltage gain specifications are for units with the input sensi- 2 Specifications tivity set to 0.775 volts for 8/4 ohm output: Com-Tech 810: 64:1 ±12% or 36 dB ±1 dB. The following specifications apply to all models in Dual mode Com-Tech 1610 : 85:1 ±12% or 39 dB ±1 dB.
Page 8: Indicators
2.5 Input/Output Note: The turn-on delay time may be changed. Contact Input Connector: A barrier block on the standard PIP2-BB Crown's Technical Support Group for details. with three-terminal balanced connections for input to each channel and test points for a DVM.
Page 9 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Height B: 5.25 inches (13.3 cm) 100/120 VAC, 50/60 Hz Units: Models: Com-Tech 410 (100/120 VAC, 50/60 Hz) Com-Tech 810 : 45 pounds, 1 ounce Com-Tech 410 (220/240 VAC, 50/60 Hz) (20.5 kg) net;...
Page 10 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 –1 8 ohm 1 watt 4 ohm –2 –3 –4 –5 –6 –7 10 K 100 K FREQUENCY (Hz) Figure 2.1 Typical Frequency Response 1400 1200 1000 8 ohm 10 K 20 K FREQUENCY (Hz) Figure 2.2 Typical Damping Factor...
Page 11 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual ® Measurement +45˚ 0˚ –45˚ TECHRON TEF ® 10 K 20 K FREQUENCY (Hz) Figure 2.4 Typical Phase Response ® Measurement ® TECHRON TEF 10 K 20 K FREQUENCY (Hz) Figure 2.5 Typical Crosstalk...
Page 12 When measuring power, 0.1% THD appears to be the industry standard for distortion. Two of the maximum average power specifications shown in each minimum power matrix are measured at 0.1% THD so you can easily compare Crown specifications to those of other manufacturers.
Page 13 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Com-Tech 1610 – Minimum Guaranteed Power (Watts) Maximum Average FTC Continuous Average Dual/Mono At 0.1% THD At 0.1% THD At 0.05% THD At 0.1% THD (See note 1) (See note 2) (See note 3) (See note 4) Mode...
Page 14 Maximum Power Specifications Crown’s maximum power specifications represent the largest amount of output power you can expect from your amplifier when it is driven to full output under the given conditions. These specifications can be used to prevent loudspeaker and hearing damage.
Page 15 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Com-Tech 1610 – Maximum Power (Watts) Single Cycle Tone Burst 40 Millisecond Tone Burst Dual/Mono At less than 0.05% THD At 0.05% THD (See note 1) (See note 2) Mode 20 Hz 50 Hz 1 kHz 7 kHz...
Page 16 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 This page intentionally left blank. 2-10...
Page 17: Ac Power Draw And Thermal Dissipation
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual • Duty cycle of background music is 20%. 3 AC Power Draw and • Duty cycle of continuous speech is 10%. • Duty cycle of infrequent paging is 1%. Thermal Dissipation Here are the equations used to calculate the data pre- sented in Figures 3.1 and 3.2: “Soft-Star...
Page 18: Ac Mains Voltage Conversion
BLK/RED BLK/WHT 4.1 Com-Tech Voltage Conversion 100V Due to Crown's distribution of Com-Tech amplifiers all 120V over the world, not all of these amplifiers are built with the same power supply components. Refer to the fol- 4.1.3 220/240 VAC Export Units...
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Page 20: Theory
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual The two channels may be used together to double the 5 Theory voltage (Bridge-Mono) or current (Parallel-Mono) pre- sented to the load. This feature gives you flexibility to maximize power available to the load. 5.1 Overview Com-Tech amplifiers incorporate several new technologi- A wide bandwidth, multiloop design is used for state-of-...
Page 21: Error Amp
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual fed to its op-amp stage. Because gain after this stage into positive and negative drive signals for the bal- is fixed at 26 dB (factor of 20), greater amplifier sensi- anced voltage translator stage. These offset reference tivity is achieved by controlling the ratio of feedback voltages drive the input to the Voltage Translator tran- to input resistance.
Page 22: Grounded Bridge Topology
Flyback diodes shunt back-EMF pulses from reactive ased class AB. They provide output drive through the High Side Low Side of Bridge of Bridge H.S. L.S. Inverter Input Load H.S. L.S. NFb Loop Figure 5.2 Crown's Patented Grounded Bridge Topology...
Page 23: Low Side (Ls)
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual loads to the power supply to protect output devices from dangerous reverse voltage levels. An output ter- The total effect is to deliver a peak to peak voltage to minating circuit blocks RF on output lines from enter- the speaker load which is twice the voltage produced ing the amplifier through the amp’s output connectors.
Page 24 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Figure 5.3 Circuit Block Diagram...
Page 25: Dual Operation
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual 5.6 Dual Operation A thermal sensor supplies the ODEP circuits with infor- mation on the operating temperature of the heat sink on For simplicity, the discussion of Dual operation will refer which the output devices are mounted.
Page 26: Electrical Checkout Procedures
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual 40° C measure the DC voltage on the output module 6 Electrical Checkout across R37 (15 ohm), adjust R02 if necessary. Mea- sure the DC voltage on the output module across R39 Procedures (15 ohm), adjust R33 if necessary.
Page 27: Quiescent Power Draw
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 6.2.9 Common Mode Rejection 6.2.6 Quiescent Power Draw Spec: 60 watts maximum Spec: >70 dB @ 1 kHz. Procedure: Using a cable with the inverting and non- Procedure: With no input signal the amplifier should inverting inputs shorted together inject a 0 dBu (0.775 draw no more than 60 watts from the power source.
Page 28: Output Power
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Procedure: Load each channel to 8 ohms. Inject a 20 and, on the CT-810 , measure at least 75.4 VAC at the kHz sine wave into channel 1 and, if the amp is a CT- output of each channel with less than 0.05% THD.
Page 29: Lf Protection
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 6.2.16 LF Protection 6.2.19 Displays Spec: Spec: Amplifier channel will cycle into protect with .5 Hz 6Vp-p or 2 Hz 6 Vrms sine wave at the output. Enable - On when low voltage supply is on. ODEP - Dims in proportion to ODEP limiting.
Page 30: Exploded Views
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual 7 Exploded Views Com-Tech 810 Main Chassis ............7-2 Com-Tech 810 Front Panel ............7-4 Com-Tech 810 Rear Panel ............7-6 Com-Tech 810 Chassis Bottom ........... 7-8 Com-Tech 1610 Main Chassis ..........7-10 Com-Tech 1610 Front Panel ............
Page 31: Com-Tech 810 Main Chassis
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.1 Com-Tech 810 Main Chassis...
Page 32 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Item Qty Item Item Qty..Description Description Description Description Description GUARD, 2.4" FINGER BLK F11572J8 8-32 X.5 OVAL HD PH MSCR BZ A10090-70808 FILTER, FR AIR 3.15 X 16.23 X .13 D 7118-9 .5 X .136 X .02 NYLON WASHER A10101-5...
Page 33: Com-Tech 810 Front Panel
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.2 Com-Tech 810 Front Panel...
Page 34 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Item Qty Qty..Description Description Description Item Item Description Description OVERLAY, CT810 REM FP 101741-1 SWITCH, DPDT CENTER OFF 16A 101843-1* CHASSIS, CT'10A 3U CE 125302-1 PWA, CT10A DISPLAY 125402-1...
Page 35: Com-Tech 810 Rear Panel
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.3 Com-Tech 810 Rear Panel...
Page 36 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Item Qty Qty..Description Description Description Item Item Description Description A11793-0109N PWR CORD, 14-3 SJT NEON 39 IN, 120V DOMESTIC A11793-0308N PWR CORD, 14-3 SJT 5-15 39 IN, 100V, 220V, 120 EXP. A10793-0507R PWR CORD, EUR PLUG 39 IN, 220 V CE A10793-0707R...
Page 37: Com-Tech 810 Chassis Bottom
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.4 Com-Tech 810 Chassis Bottom...
Page 38 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Qty..Description Description Item Item Item Description Description Description OCB.500 SNAP BUSHING A10192-1 INSULATOR, THROUGH HOLE OUTPUT 2(per channel) 125547-1 PWA, CT810A/1610A OUTPUT 102774-1 1(per channel) 1"...
Page 39: Com-Tech 1610 Main Chassis
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.5 Com-Tech 1610 Main Chassis 7-10...
Page 40 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Qty..Description Description Item Item Qty Item Description Description Description GUARD, 4.024: FINGER BLK F11577J7 8-32 X.5 OVAL HD PH MSCR BZ A10090-70808 FILTER, FR AIR 16.23 X 4.9 D 7119-7 .5 X .136 X .02 NYLON WASHER A10101-5...
Page 41: Com-Tech 1610 Front Panel
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.6 Com-Tech 1610 Front Panel 7-12...
Page 42 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Qty..Description Description Item Item Item Qty Description Description Description OVERLAY, CT1610 REM FP 101743-1 SWITCH, DPDT CENTER OFF 16A 101843-1* CHASSIS, CT'10A 4U CE 125303-1 PWA, CT10A DISPLAY 125402-1...
Page 43: Com-Tech 1610 Rear Panel
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.7 Com-Tech 1610 Rear Panel 7-14...
Page 44 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Qty..Description Description Item Item Qty Item Description Description Description A11793-0108N PWR CORD, 14-3 SJT NEON 39 IN, 120V DOMESTIC A11793-0308N PWR CORD, 14-3 SJT 5-15 39 IN, 100V, 220V, 120 EXP. A10793-0507R PWR CORD, EUR PLUG 39 IN, 220V CE A10793-0707R...
Page 45: Com-Tech 1610 Bottom Chassis
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.8 Com-Tech 1610 Bottom Chassis 7-16...
Page 46 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Item Item Item Qty..Description Description Description Description Description OCB.500 SNAP BUSHING A10192-1 INSULATOR, THROUGH HOLE OUTPUT 1(per channel) 125547-1 PWA, CT810A/1610A OUTPUT 102774-1 1(per channel) 1"...
Page 47: Com-Tech 810 & 1610 Heatsink Assembly
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.9 Com-Tech 810 & 1610 Heatsink Assembly 7-18...
Page 48 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Item Item Item Qty Qty..Description Description Description Description Description 2(per channel) HS, ALUM 3/4" FINS ADH #7 M21324-5 6(per channel) SJ7148 NPN PWR XSISTOR C 8187-4 28(per channel) 6-32X.312 PAN HD T15 TT TYPE W...
Page 49: Com-Tech 810 & 1610 Capacitor Assembly
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.10 Com-Tech 810 & 1610 Capacitor Assembly 7-20...
Page 50 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Item Item Item Qty Qty..Description Description Description Description Description 1(per channel) 6300UF 150V ELECTROLYTIC CAP D 8639-3 2(per channel) WSHR, SHOULDER CAP ASM D6764-1 1(per channel) BRACKET, CAPACITOR D 8438-0...
Page 51: Com-Tech 810 Transmotor Assembly
Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 Figure 7.11 Com-Tech 810 Transmotor Assembly 7-22...
Page 52 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual Item Item Qty..Description Description Item Item Item Qty Description Description Description 6-32 X5/16 UNDERCUT FLTHD MSCR C 7062-0 BRACKET, FAN D 8439-8 MOTOR, CT FAN PREP CE 101399-1 FAN BLADE, 4.0 INCH CCW C 9939-7...
Page 53: Schematics And Module Documentation
Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual 102831-1 8 Schematics and Built on 102824-1 board. NLA. Original CT10A module. Replace with 125419-1. Module Documentation 125235-1 Built on 125235-1 board. CE version, for use on ampli- MODULE HISTORY fiers that carry the CE rating. Current Production. The Com Tech 10A can be distinguished from the Com 125419-1 Tech 10 by the addition of an RJ11 jack located on the...
Page 54 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 102829-1 125412-1 Built on 125414 board. Dual Pot. Replace with 125412- Built on 102824-1 board. NLA. Used in CT-1610A only. Replace with 125417-1. 125412-2 102833-1 Built on 125414-3 board. NLA. Dual Pot. Replace with Built on 102824-2 board.
Page 55 The grounding pad is located at the corner of the Com-Tech 1610A Main 102769 board around the mounting hole (it is also labeled Com-Tech 1610A Main (Dual Pot) 102769 "chassis ground"). The Crown part number for this wire is A11544-4140G. Com-Tech 10 Display 100281 Com-Tech 10A Display 125402...
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Page 57 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT810 Main Module Information On Following Pages Documentation, Component Map, Schematic...
Page 84 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810A Main Module 125412 Information On Following Pages Documentation, Component Map, Schematic...
Page 131 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT810A Main Module 102755 Information On Following Pages Documentation, Component Map, Schematic...
Page 156 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810A Main Module (Dual Pot) Information On Following Pages Documentation, Component Map...
Page 179 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610 Main Module Information On Following Pages Documentation, Component Map, Schematic...
Page 206 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT1610A Main Module 125413 Information On Following Pages Documentation, Component Map, Schematic 8-10...
Page 231 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610A Main Module 102789 Information On Following Pages Documentation, Component Map, Schematic 8-11...
Page 256 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT1610A Main Module (Dual Pot) Information On Following Pages Documentation, Component Map 8-12...
Page 279 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT810 Control Module 100V Information On Following Pages Documentation, Component Map, Schematic 8-13...
Page 289 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810 Control Module 120V Information On Following Pages Documentation, Component Map, Schematic 8-14...
Page 299 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT10 Control Module 220V/240V Information On Following Pages Documentation, Component Map, Schematic 8-15...
Page 309 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810A Control Module 100V 102833 Information On Following Pages Documentation, Component Map, Schematic 8-16...
Page 316 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT810A Control Module 100V 125420 Information On Following Pages Documentation, Component Map, Schematic 8-17...
Page 328 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT10A Control Module 120V 125416 Information On Following Pages Documentation, Component Map, Schematic 8-18...
Page 335 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT10A Control Module 220V/240V 102831 Information On Following Pages Documentation, Component Map, Schematic 8-19...
Page 342 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT10A Control Module 220V/240V 125419 Information On Following Pages Documentation, Component Map, Schematic 8-20...
Page 354 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610 Control Module 100V Information On Following Pages Documentation, Component Map, Schematic 8-21...
Page 363 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT1610 Control Module 120V Information On Following Pages Documentation, Component Map, Schematic 8-22...
Page 372 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610A Control Module 100V 102827 Information On Following Pages Documentation, Component Map, Schematic 8-23...
Page 378 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT1610A Control Module 100V 125417 Information On Following Pages Documentation, Component Map, Schematic 8-24...
Page 385 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610A Control Module 120V 102829 Information On Following Pages Documentation, Component Map, Schematic 8-25...
Page 391 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT1610A Control Module 120V 125418 Information On Following Pages Documentation, Component Map, Schematic 8-26...
Page 403 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT10 Display Module Information On Following Pages Documentation, Component Map, Schematic 8-27...
Page 412 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT10A Display Module 102682 Information On Following Pages Documentation, Component Map, Schematic 8-28...
Page 421 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT10A Display Module 125402 Information On Following Pages Documentation, Component Map, Schematic 8-29...
Page 428 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810/1610 Output Module Information On Following Pages Documentation, Component map, Schematic 8-30...
Page 438 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT810A/1610A Output Module Information On Following Pages Documentation, Component Map, Schematic 8-31...
Page 452 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810 Interconnect Diagram 8-32...
Page 454 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610 Interconnect Diagram 8-33...
Page 456 Com-Tech 810 and 1610 Amplifier Service Manual Rev. 0 CT810A Interconnect Diagram 8-34...
Page 458 Rev. 0 Com-Tech 810 and 1610 Amplifier Service Manual CT1610A Interconnect Diagram 8-35...

This manual is also suitable for:

Com-tech ct-810 Com-tech 810 Com-tech 1610

Crown Com-Tech CT-1610 Service Manual

Table of Contents

1 Introduction

2 Specifications

3 AC Power Draw and Thermal Dissipation

4 AC Mains Voltage Conversion

5 Theory

6 Electrical Checkout Procedures

7 Exploded Views

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Service Manual

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