Crown Com-Tech 1610 Service Manual Download Page 44

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Com-Tech 810 and 1610 Amplifier Service Manual

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7-15

Rev. 0

Item

Qty

Qty.....

Description

CPN

PWR CORD, 14-3 SJT NEON 39 IN, 120V DOMESTIC

A11793-0108N

PWR CORD, 14-3 SJT 5-15 39 IN, 100V, 220V, 120 EXP.

A11793-0308N

PWR CORD, EUR PLUG 39 IN, 220V CE

A10793-0507R

PWR CORD, INDIA PLUG 39 IN, 240V

A10793-0707R

PWR CORD, AUSTRALIA PLUG 39 IN, 240V

A10793-0807R

BP, CT1610A REM PIP2 4U DOMESTIC

102542-1*

8-32 X .5 PNHD PH TAPTITE BLK

A10110-70808

#8 INT STAR LOCKWASHER BLACK

A10094-5

4-141-Y #6 BARRIER BLOCK

C 5990-4

8-32 X .37 RDHD BZ MSCR

A10086-70806

DPDT 15A SLIDE SW PNL MT

C 7957-1

JACK, RJ11 PANEL MOUNT

102686-1

BRKR, 1 POLE 20A SNAP-IN VDE 1610A, 220V, 240V

C10177-1

BRKR, 30A 250VAC SNAP-IN THERM1610A, 100V, 120V

C 9837-3

STRAIN RELIEF SR7N-2 BLACK (14-3)

A10214-7

STRAIN RELIEF, EUR SR-6P30-CEE

C10187-0

COVER, DUAL/MONO SWITCH PC

100454-1

#6 INT STAR WASHER BLACK

A10094-3

6-32X.312 PAN HD T15 TT TYPE W

C 9491-9

8-32 X .37 RDHD BZ MSCR

A10086-70806

ASM, PIP2BB

100450-1

* Com-Tech 1610A only.

Summary of Contents for Com-Tech 1610

Page 1: ...Tech amplifiers are produced by the Professional Audio Division of Crown International Inc Trademark Notice SmartAmp and Grounded Bridge are trademarks and Amcron Crown Com Tech IOC ODEP IQ System P I P and TEF are registered trademarks of Crown International Inc Other trademarks are the property of their respective owners Models Com Tech 810 1610 Some models may be exported under the name Amcron ...

Page 2: ...S GAIN SWITCH CAUTION AVIS WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE 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 scop...

Page 3: ...on 3 1 4 AC Mains Voltage Conversion 4 1 4 1 Com Tech Voltage Conversion 4 1 4 1 1 120 VAC 60 Hz Units 4 1 4 1 2 100 120 VAC Export Units 4 1 4 1 3 220 240 VAC Export Units 4 1 5 Theory 5 1 5 1 Overview 5 1 5 2 Front End Operation 5 1 5 2 1 Balanced Gain Stage BGS 5 1 5 2 2 Variable Gain Stage VGS 5 1 5 2 3 Error Amp 5 2 5 3 Voltage Amplification 5 2 5 3 1 Voltage Translators 5 2 5 3 2 Last Voltag...

Page 4: ... DC Offset 6 1 6 2 6 Quiescent Power Draw 6 2 6 2 7 Voltage Gain 6 2 6 2 8 Current Sense Calibration 6 2 6 2 9 Common Mode Rejection 6 2 6 2 10 Current Limit 6 2 6 2 11 10 kHz Square Wave Response 6 2 6 2 12 20 kHz Crosstalk 6 3 6 2 13 Output Power 6 3 6 2 14 ODEP Limiting 6 3 6 2 15 Fan Operation optional in Com Tech 210 6 3 6 2 16 LF Protection 6 4 6 2 17 Signal to Noise 6 4 6 2 18 Intermodulati...

Page 5: ... range of power output capabilities Com Tech amplifiers can directly drive constant voltage lines so you can avoid the expense distortion and insertion loss associated with step up transformers for distributed loudspeaker systems Com Tech amplifi ers also utilize Crown s patented ODEP protection cir cuitry which keeps the amplifier working under severe conditions that would shut down a lesser ampl...

Page 6: ...Com Tech 810 and 1610 Amplifier Service Manual 1 2 Rev 0 This page intentionally left blank ...

Page 7: ...ionsareforunitswiththeinputsensi tivity set to 0 775 volts for 8 4 ohm output Com Tech810 64 1 12 or 36 dB 1 dB Com Tech1610 85 1 12 or39dB 1dB 2 2 Power OutputPower SeetheminimumGuaranteedPowertablein Figures 2 6 7 for the output power specifications under a variety of conditions It is extremely important to supply the amplifier with ad equateACpower Poweramplifierscannotaddpower they need the re...

Page 8: ...e Parallel Mono Unbalanced single channel Channel1con trols are active Channel 2 is bypassed 2 7 Protection Com Techamplifiersareprotectedagainstshorted openor mismatchedloads overloadedpowersupplies excessive temperature chaindestructionphenomena inputoverload damage and high frequency blowups It also protects loudspeakers from input output DC and turn on turn off transients If unreasonable opera...

Page 9: ...ght Com Tech1610 57pounds 14ounces 26 3 kg net 66 pounds 10 ounces 30 2 kg shipping weight 100 120 VAC 50 60 Hz Units Com Tech 810 45 pounds 1 ounce 20 5 kg net 49 pounds 10 ounces 22 5 kg shipping weight Com Tech1610 54pounds 11ounces 24 8 kg net 64 pounds 3 ounces 29 1 kg shipping weight 220 240 VAC 50 60 Hz Units Com Tech 810 45 pounds 4 ounces 20 5 kg net 49 pounds 13 ounces 22 6 kg shipping w...

Page 10: ...0 1 2 3 4 dB 5 6 7 4 ohm 8 ohm 1 watt 504 0 126 8 31 8 MILLIOHMS 8 0 2 0 6 dB 20 100 1 K 10 K 20 K 400 200 100 0 600 800 1000 1200 1400 FREQUENCY Hz 8 ohm 10 100 1 K 10 K 100 K FREQUENCY Hz Figure 2 1 Typical Frequency Response Figure 2 2 Typical Damping Factor Figure 2 3 Typical Output Impedance ...

Page 11: ...mplifier Service Manual 2 5 Rev 0 Figure 2 4 Typical Phase Response Figure 2 5 Typical Crosstalk TEF Measurement 100 1 K 10 K 20 K FREQUENCY Hz dB TECHRON TEF TECHRON TEF 45 0 45 100 1 K 10 K 20 K FREQUENCY Hz TEF Measurement ...

Page 12: ...n house measure ments you can expect every Crown amplifier to meet or exceed its published minimum power specs We believe you should get what you pay for Minimum Power Notes All minimum power specifications are based on 0 5 regulated AC mains with THD of less than 1 0 and an ambient room temperature of 70 F 21 C Standard EIA power RS 490 is not shown here because it is identical to FTC Continuous ...

Page 13: ...See note 3 1 kHz 100 120 VAC 50 60 Hz Dual both channels driven Bridge Mono balanced output Parallel Mono 220 240 VAC 50 60 Hz 6 25 70V 4 2 12 5 140V 8 3 13 70V 8 4 16 6 25 70V 4 2 12 5 140V 8 3 13 70V 8 4 16 6 25 70V 4 2 12 5 140V 8 3 13 70V 8 4 16 870 540 960 1745 1080 1805 1745 1080 1780 815 535 860 1625 1070 1700 1660 1080 1700 840 545 875 1675 1090 1755 1650 1075 1745 810 520 910 1595 1040 17...

Page 14: ...redfornonlinear distortion The average power during the burst is reported Loudspeakers must be able to withstand this level if they are to be safely used with this ampli fier 2 A 40 millisecond sine wave burst 10 percent duty cycle is presented to the amplifier and monitored for nonlinear distortion Aver agepowerduringtheburst is reported This power level is a measurement of the amplifier s maximu...

Page 15: ...70V 8 4 16 780 525 950 1600 1050 1770 1590 1140 1895 820 555 955 1635 1090 1895 1640 1090 1845 800 535 885 1600 1055 1800 1615 1065 1855 1000 600 1035 1995 1185 1980 1985 1170 2015 1060 655 1100 2095 1285 2165 2105 1300 2110 1060 630 1025 2060 1225 2115 2100 1230 2080 1245 670 1205 2480 1330 2315 2465 1330 2375 1370 750 1295 2700 1475 2550 2715 1470 2530 1295 700 1210 2580 1410 2475 2585 1415 2450...

Page 16: ...Com Tech 810 and 1610 Amplifier Service Manual 2 10 Rev 0 This page intentionally left blank ...

Page 17: ...mains voltage and current The following equation is used to calculate thermal dissipation Total output power with all channels driven watts Thermal Dissipation btu hr Quiescent Power Draw watts x 35 Duty Cycle x Amplifier Efficiency 65 x 3 415 The constant 0 35 is inefficiency 1 00 0 65 and the fac tor 3 415 converts watts to btu hr Thermal dissipation in btu is divided by the constant 3 968 to ge...

Page 18: ...rt Units These units have two tap transformers that accept a 50 or 60 Hz AC line and can be configured for 100 or 120 VAC To convert from one voltage to another switch the BLK RED and BLK WHT wires Refer to the follow ing chart Control Board Wiring Line Wiring Connections Voltage BLK RED BLK WHT 100V W9 W2 120V W2 W9 4 1 3 220 240 VAC Export Units These units have two tap transformers that accept ...

Page 19: ...Com Tech 810 and 1610 Amplifier Service Manual 4 2 Rev 0 This page intentionally left blank ...

Page 20: ... the high side PNP and low side NPN The two channels may be used together to double the voltage Bridge Mono or current Parallel Mono pre sented to the load This feature gives you flexibility to maximize power available to the load A wide bandwidth multiloop design is used for state of the art compensation This produces ideal behavior and results in ultra low distortion values Aluminum extrusions h...

Page 21: ...s for the bal anced voltage translator stage These offset reference voltages drive the input to the Voltage Translator tran sistors Q104 Q105 A nested NFb loop from the out put of the amplifier mixes with the inverted signal riding on the offset references This negative feedback fixes gain at the offset reference points and the output of the Error Amp at a factor of 25 2 with respect to the amplif...

Page 22: ...gure 5 2 Crown s Patented Grounded Bridge Topology bias resistor bypassing the output devices at levels below about 100mW An RLC network between the predriver and driver provide phase shift compensa tion and limit driver base current to safe levels Output devices are biased class B just below cutoff At about 100mW output they switch on to conduct high current to the load Together with predriver an...

Page 23: ...summary a power supply which pro duces a total of 70VDC rail to rail or 35VDC stati cally is capable of producing 140V peak to peak at the amplifier output when the grounded bridge topol ogy is used The voltages used in this example are relatively close to the voltages of the PB 1 460CSL The total effect is to deliver a peak to peak voltage to the speaker load which is twice the voltage produced b...

Page 24: ... STAGE OUTPUT Vcc Vcc TRANSLATOR LVA LVA Vcc Vcc BIAS CURRENT LIMIT TRANSLATOR BALANCE INPUT STAGE P I P BALANCED INPUT VARIABLE GAIN STAGE ERROR AMP DISPLAY BIAS BRIDGE BALANCE Vcc Vcc POWER SUPPLY CONTROL DC LF TIMER POWER SUPPLY Vcc Vcc ODEP A B A ODEP B ODEP D E DISPLAY D C DISPLAY E HS TEMP C ODEP 24 24 ENABLE BARRIER BLOCK Figure 5 3 Circuit Block Diagram ...

Page 25: ...the patented ODEP circuitry is used It produces an analog output propor tional to the always changing safe operating area of the output transistor This output controls the translator stage previously mentioned removing any further drive that may exceed the safe operating area of the output stage A thermal sensor supplies the ODEP circuits with infor mation on the operating temperature of the heat ...

Page 26: ...is applied to the output section of the ampli fier 6 2 3 Output Bias Adjustment Spec 320 to 340 mVDC Procedure While the heatsink temperature is less than 40 C measure the DC voltage on the output module across R37 15 ohm adjust R02 if necessary Mea sure the DC voltage on the output module across R39 15 ohm adjust R33 if necessary Repeat for the sec ond channel 6 2 4 ODEP Voltage Adjustment Spec S...

Page 27: ... channel 2 measure pin 9 of TP200 and adjust R461 Figure6 1DifferentiatorCircuit In Out 047 uF 1K Ohm Figure 6 2 Differentiated wave form at current limit 6 2 9 Common Mode Rejection Spec 70 dB 1 kHz Procedure Using a cable with the inverting and non inverting inputs shorted together inject a 0 dBu 0 775 Vrms 1 kHz sine wave into each channel one channel at a time At the output measure less than 4...

Page 28: ...hannel with less than 0 05 THD On a CT 1610 the VAC reading should be 58 7 Switch the output mode switches to 70V If working on a CT 410 load each channel to 12 5 ohms on a CT 1610 the load should be 6 25 ohms Inject a 1 kHz sine wave and on the CT 810 measure at least 75 4 VAC at the output of each channel with less than 0 05 THD On the CT 1610 you should measure at least 77 3 VAC 6 2 14 ODEP Lim...

Page 29: ...ows On CT810A and 1610A remove the jumpers across pins 3 4 of TP100 and TP200 Level Controls 9 to 11 O Clock Sensitivity Switch 775V 8 4 Ohm 6 2 17 Signal to Noise Spec CT 810 100 dB below 295 watts into 8 ohms 20Hz 20kHz unweighted Spec CT 1610 100 dB below 520 watts into 8 ohms 20Hz 20kHz unweighted Procedure Short inputs Load each channel to 8 ohms On a CT 810 measure less than 486µVrms at the ...

Page 30: ...ont 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 7 12 Com Tech 1610 Rear Panel 7 14 Com Tech 1610 Bottom Chassis 7 16 Com Tech 810 1610 Heatsink Assembly 7 18 Com Tech 810 1610 Capacitor Assembly 7 20 Com Tech 810 Transmotor Assembly 7 22 ...

Page 31: ...Com Tech 810 and 1610 Amplifier Service Manual 7 2 Rev 0 Figure 7 1 Com Tech 810 Main Chassis 4 5 6 1 2 3 7 9 10 23 16 17 20 19 18 22 21 24 25 15 14 13 28 27 26 11 12 8 ...

Page 32: ...E W C 9491 9 13 1 BACK PANEL ASSEMBLY See Fig 7 3 14 2 CAPACITOR ASSEMBLY See Fig 7 10 15 2 10 32 X 50 RDHD PH MSCR Z A10086 11008 16 1 CVR MA MT PB CT TOP PC D 8501 5 17 8 SCREW 6 32X 312 TORX PNHD SEM 103415 70605 18 1 XFMR CT810 A 120V 60HZ 102779 1 18 1 XFMR CT810 A 100 120V 50 60HZ 102780 1 18 1 XFMR CT810 A 220 240V 50 60HZ 102781 1 19 4 10 32 X 1 75 TRHD PH MSCR Z A10087 11028 20 4 10 NYL S...

Page 33: ...Com Tech 810 and 1610 Amplifier Service Manual 7 4 Rev 0 Figure 7 2 Com Tech 810 Front Panel 1 2 4 5 3 ...

Page 34: ...ty Qty Qty Description Description Description Description Description CPN CPN CPN CPN CPN 1 1 OVERLAY CT810 REM FP 101741 1 2 1 SWITCH DPDT CENTER OFF 16A 101843 1 3 1 CHASSIS CT 10A 3U CE 125302 1 4 1 PWA CT10A DISPLAY 125402 1 5 2 6 32X 312 PAN HD T15 TT TYPE W C 9491 9 Com Tech 810A only ...

Page 35: ...Com Tech 810 and 1610 Amplifier Service Manual 7 6 Rev 0 Figure 7 3 Com Tech 810 Rear Panel 13 12 11 4 3 5 6 2 7 15 10 1 14 8 9 ...

Page 36: ...M PIP2 3U DOMESTIC 102398 1 3 3 8 32 X 5 PNHD PH TAPTITE BLK A10110 70808 4 3 8 INT STAR LOCKWASHER BLACK A10094 5 5 1 4 141 Y 6 BARRIER BLOCK C 5990 4 6 4 8 32 X 37 RDHD BZ MSCR A10086 70806 7 2 DPDT 15A SLIDE SW PNL MT C 7957 1 8 1 JACK RJ11 PANEL MOUNT 102686 1 9 1 BRKR 1 POLE 10A SNAP IN VDE 810A 220V 240V C10170 6 9 1 BRKR 1 POLE 20A SNAP IN VDE 810A 100V 120V C10177 1 10 1 STRAIN RELIEF SR7N...

Page 37: ...Com Tech 810 and 1610 Amplifier Service Manual 7 8 Rev 0 Figure 7 4 Com Tech 810 Chassis Bottom 1 2 3 4 6 7 8 9 10 11 5 ...

Page 38: ...nel INSULATOR THROUGH HOLE OUTPUT 125547 1 3 1 per channel PWA CT810A 1610A OUTPUT 102774 1 4 2 1 SPACER TOGGLE NUT PLASTIC C 6913 5 5 2 TENSION RETAINING BD SUPPORTS C 6912 7 6 1 PWA CT810A MAIN DUAL POT 125412 3 7 2 NYL THUMBSCREW WASHER D 4137 2 8 2 8 18X1 375 PH PNHD ST SCR Z A10109 10822 9 2 75 SPACER TOGGLE NUT PLASTIC C 6914 3 10 12 per channel 6 32 X 56 HEX WSHR HD W T15 A10315 1 11 1 CHAS...

Page 39: ...Com Tech 810 and 1610 Amplifier Service Manual 7 10 Rev 0 Figure 7 5 Com Tech 1610 Main Chassis 25 9 10 4 5 6 1 2 3 7 23 16 17 20 19 18 22 21 24 15 14 13 28 27 26 11 12 8 ...

Page 40: ...491 9 13 1 BACK PANEL ASSEMBLY See Fig 7 7 14 2 CAPACITOR ASSEMBLY See Fig 7 10 15 2 10 32 X 50 RDHD PH MSCR Z A10086 11008 16 1 CVR MA MT PB CT TOP PC D 8501 5 17 8 SCREW 6 32X 312 TORX PNHD SEM 103415 70605 18 1 XFMR CT1610 A 120V 60HZ 102782 1 18 1 XFMR CT1610 A 100 120V 50 60HZ 102783 1 18 1 XFMR CT1610 A 220 240V 50 60HZ 102784 1 19 4 10 32 X 1 75 TRHD PH MSCR Z A10087 11028 20 4 10 NYL SHLDR...

Page 41: ...Com Tech 810 and 1610 Amplifier Service Manual 7 12 Rev 0 Figure 7 6 Com Tech 1610 Front Panel 1 2 4 5 3 ...

Page 42: ...ty Qty Qty Description Description Description Description Description CPN CPN CPN CPN CPN 1 1 OVERLAY CT1610 REM FP 101743 1 2 1 SWITCH DPDT CENTER OFF 16A 101843 1 3 1 CHASSIS CT 10A 4U CE 125303 1 4 1 PWA CT10A DISPLAY 125402 1 5 2 6 32X 312 PAN HD T15 TT TYPE W C 9491 9 Com Tech 1610A only ...

Page 43: ...Com Tech 810 and 1610 Amplifier Service Manual 7 14 Rev 0 Figure 7 7 Com Tech 1610 Rear Panel 2 7 15 1 14 8 9 13 12 11 4 3 5 6 10 ...

Page 44: ...PIP2 4U DOMESTIC 102542 1 3 3 8 32 X 5 PNHD PH TAPTITE BLK A10110 70808 4 3 8 INT STAR LOCKWASHER BLACK A10094 5 5 1 4 141 Y 6 BARRIER BLOCK C 5990 4 6 4 8 32 X 37 RDHD BZ MSCR A10086 70806 7 2 DPDT 15A SLIDE SW PNL MT C 7957 1 8 1 JACK RJ11 PANEL MOUNT 102686 1 9 1 BRKR 1 POLE 20A SNAP IN VDE 1610A 220V 240V C10177 1 9 1 BRKR 30A 250VAC SNAP IN THERM1610A 100V 120V C 9837 3 10 1 STRAIN RELIEF SR7...

Page 45: ...Com Tech 810 and 1610 Amplifier Service Manual 7 16 Rev 0 Figure 7 8 Com Tech 1610 Bottom Chassis 12 13 14 1 2 3 4 6 7 8 9 10 11 5 ...

Page 46: ...hannel PWA CT810A 1610A OUTPUT 102774 1 4 2 1 SPACER TOGGLE NUT PLASTIC C 6913 5 5 2 TENSION RETAINING BD SUPPORTS C 6912 7 6 1 PWA CT1610A MAIN DUAL POT 125413 2 7 2 NYL THUMBSCREW WASHER D 4137 2 8 2 8 18X1 375 PH PNHD ST SCR Z A10109 10822 9 2 75 SPACER TOGGLE NUT PLASTIC C 6914 3 10 12 per channel 6 32 X 56 HEX WSHR HD W T15 A10315 1 11 1 CHASSIS CT 10A 4U CE 1610A 125303 1 12 1 30A 120VAC SPS...

Page 47: ...Com Tech 810 and 1610 Amplifier Service Manual 7 18 Rev 0 Figure 7 9 Com Tech 810 1610 Heatsink Assembly 2 3 8 5 1 6 11 7 9 4 10 ...

Page 48: ...OR C 8187 4 3 28 per channel 6 32X 312 PAN HD T15 TT TYPE W C 9491 9 4 6 per channel TRANSISTOR PNP SELECT C 8188 2 D 9213 6 5 1 per channel ASM THERMAL SENSE H42902 9 6 1 per channel SILPAD 2 87X14 57 7 MIL D 7796 2 7 2 per channel BRKT T03P HEATSINK D 7666 7 8 2 per channel 2SC2837 PWR NPN T03P SANKEN DRIVER C 8574 3 9 2 per channel CLIP T03P MOUNTING D 7665 9 10 2 per channel 2SA1186 PWR PNP T0...

Page 49: ...Com Tech 810 and 1610 Amplifier Service Manual 7 20 Rev 0 Figure 7 10 Com Tech 810 1610 Capacitor Assembly 1 2 3 4 5 6 7 8 9 ...

Page 50: ...764 1 3 1 per channel BRACKET CAPACITOR D 8438 0 4 2 per channel 1 4 BELLEVILLE SPRING WSHR A10098 5 5 2 per channel 8 RING TERM 16 22 AWG PIDG C 7897 9 6 4 per channel 10 INT TOOTH LOCKWASHER ZINC A10094 8 7 2 per channel 10 32 X 50 RDHD PH MSCR Z A10086 11008 8 1 per channel 35A 400V BRIDGE RECTIFIER C 8752 5 8 1 per channel RECTIFIER 35A W 1UF CAP WELD export H43603 2 9 2 per channel 10 32 X 50...

Page 51: ...Com Tech 810 and 1610 Amplifier Service Manual 7 22 Rev 0 Figure 7 11 Com Tech 810 Transmotor Assembly ...

Page 52: ...em Item Item Item Item Qty Qty Qty Qty Qty Description Description Description Description Description CPN CPN CPN CPN CPN 1 2 6 32 X5 16 UNDERCUT FLTHD MSCR C 7062 0 2 1 BRACKET FAN D 8439 8 3 1 MOTOR CT FAN PREP CE 101399 1 4 1 FAN BLADE 4 0 INCH CCW C 9939 7 ...

Page 53: ...CT10 module Replace with 102831 1 101057 2 Built on 100283 1 board NLA Added remote turn on removed extra fan circuitry and added cap for turn on off transients Replace with 102831 1 102831 1 Built on 102824 1 board NLA Original CT10A module Replace with 125419 1 125235 1 Built on 125235 1 board CE version for use on ampli fiers that carry the CE rating Current Production 125419 1 Built on 125415 ...

Page 54: ...00291 2 board NLA Replace with 102755 1 102755 1 Built on 102756 1 board Replace with 125274 1 125274 1 Built on 125266 1 board Dual Pot Replace with 125412 3 125412 1 Built on 125414 board Dual Pot Replace with 125412 3 125412 2 Built on 125414 3 board NLA Dual Pot Replace with 125412 3 125412 3 Built on 125414 3 board Current Production CT 1610 A Q43473 0 Built on D9000 7 board NLA Replace with ...

Page 55: ...ame location on the new con trol module as was used on the old module The older CT10 series amplifiers use a 2 position on off switch with no remote position This switch has only one wire that should be connected to tab W1 on the new control board SCHEMATIC INFORMATION The schematics provided are representative only There may be slight variations from amplifier to amplifier These schematics are in...

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