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Com-Tech 200 Amplifier Service Manual

COM-TECH

200

POWER AMPLIFIER

SERVICE MANUAL

K-SVCCT200

12-95

Com-Tech

ODEP

and

Crown

are registered trademarks of Crown International, Inc.

Mailing Address:

P.O. Box 1000

Elkhart, IN U.S.A. 46515-

1000

Shipping Address:

57620 C.R. 105

Elkhart, IN U.S.A. 46517

Model CT200B

Содержание Com-Tech 200

Страница 1: ...ER SERVICE MANUAL K SVCCT200 12 95 Com Tech ODEP and Crown are registered trademarks of Crown International Inc Mailing Address P O Box 1000 Elkhart IN U S A 46515 1000 Shipping Address 57620 C R 105 Elkhart IN U S A 46517 1995 by CROWN INTERNATIONAL INC Model CT200B ...

Страница 2: ...CESS 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 s...

Страница 3: ...ist 20 Q43215 5 Control Module Parts List 21 Q43244 5 Control Module Parts List 22 Q43242 9 Control Module Parts List 23 Q42706 4 Display Module Parts List 24 Q42716 3 Output Module Parts List 25 Q42888 0 Output Module Parts List 26 Q42969 8 Output Module Parts List 27 Q43188 4 Output Module Parts List 28 Q43013 4 Main Module Parts List 29 Q43044 9 Main Module Parts List 32 Q43128 0 Main Module Pa...

Страница 4: ...ists Schematics are attached Note that component parts with circuit board comprise a complete module Module part numbers are always associated with a specificcircuitboard althoughanunpopulatedcircuit board may be built up with different parts to create different modules Note that Crown does not sell blank unpopulated circuit boards Each of the compact audio power amplifiers are de signed for profe...

Страница 5: ...our character number after the prefix letter the space is considered a character The seventh character is usually a hy phen though it may be a letter to indicate a revision or specialnote Thelastcharacteriscalledacheck digit and is useful to Crown for internal tracking Crown is in the process of converting to a new part number system Length may vary from eight to twelve characters There is still a...

Страница 6: ...e Nominally 20K ohms balanced 10K ohms unbalanced Output Impedance 10 milliohms in series with 2 microhenries Protection Systems Output Device Emulation Protec tion ODEP limits drive in the event of dangerous dynamicthermalconditionswithoutinterruptingpower Current limiting for shorted load protection DC LF and common mode output current Fault circuitry to mute audio Delay of 4 seconds from turn o...

Страница 7: ...neral thepackagingofthis model is designed for maximum watt price weight size value with user friendly features For additional details refer to the specification section or to the applicable Owner s Manual Front End Operation The front end is comprised of three stages Balanced Gain Stage BGS Variable Gain Stage VGS and the Error Amp Figure 1 shows a simplified diagram of a typical front end with v...

Страница 8: ...annelsthesignaltothe Last Voltage Amplifiers LVA s in a balanced configu ration The LVA and LVA with their push pull effect through the Bias Servo drive the fully complementary output stage The LVAs are configured as common emitter amplifiers This configuration provides suffi cient voltage gain and inverts the audio The polarity inversion is necessary to avoid an overall polarity inversionfrominpu...

Страница 9: ...in parallel with this 3 3V With a full base emitter on voltage drop across Theory Vcc Positive Rail Vcc Negative Rail Load speaker Input signal HIGH SIDE LOW SIDE Inverting Op amp Figure 2 Crown Patented Grounded Bridge Topology predrivers and drivers the balance of voltage results in approximately 35V drop across the bias resistors in the positive half and about 5V across the bias resistor in the...

Страница 10: ...re quire two power supplies per channel one positive and one negative and never exposing any output device to more than half of the peak to peak output voltage which does occur in conventional designs Low side bias is established by a diode string which also shunts built up charges on the output devices Bias is adjustable via potentiometer Flyback diodes perform the same function as the HS flyback...

Страница 11: ... PNP STAGE POSITIVE HIGH SIDE OUTPUT NPN STAGE HIGH SIDE BIAS SERVO LVA 1 LVA 1 VOLTAGE TRANSLATOR VOLTAGE TRANSLATOR OUTPUT DEVICE EMULATION PROTECTION ERROR AMP VGS BGS BALANCED INPUTS INVERTING BRIDGE BALANCE LOW SIDE BIAS DIODE STRING 1 1 MAIN NEGATIVE FEEDBACK NFb LOOP Figure 3 Typical Crown Amplifier Basic Block Diagram One Channel Shown ...

Страница 12: ...oduleacrossR32 15 ohm adjust R23 if necessary Repeat for second channel Test 3 ODEP Voltage Adjustment Spec Bias Per Chart 0 1V DC Initial Conditions Controls per standard heatsink at room temperature 20 to 30 C 68 to 86 F Note This adjustment should normally be performed within 2 minutes of turn on from ambient cold conditions If possible measure heatsink temperature if not mea sure ambient room ...

Страница 13: ...4 ohm Sensitivity 6 Spec 0 775V 70 V Sensitivity 6 Initial Conditions Controls per standard Procedure No load connected Inject a 0 775 VAC 1 kHz sine wave with the Sensitivity Switch in the 26 dB position Measure 15 5 VAC 0 5 VAC at the amplifier Electrical Checkout Procedures output Inject a 0 775 VAC 1 kHz sine wave with the Sensitivity Switch in the 0 775V 8 4 ohm position Measure 28 9 VAC 1 7 ...

Страница 14: ...ive Loads Spec No oscillations Safe with all types of loads Initial Conditions Controls per standard Procedure Capacitive Load each channel to 8 ohms in parallelwith2µF Injecta20kHzsinewavewith22VAC output for 10 seconds Procedure Inductive Load each channel to 8 ohms in parallel with 159µH Inject a 1 kHz sine wave with 15 VAC output for 10 seconds Procedure Torture Load each channel with the prim...

Страница 15: ...ndard Procedure Load each channel to 8 ohms Inject a SMPTE standard IM signal 60 Hz and 7 kHz sine wave mixed at 4 1 ratio Set the 60 Hz portion of the sine wave to 23 volts RMS Set the 7 kHz portion to 25 With an IM analyzer measure less than 0 01 IMD Repeat test at 35 dB reference 23 volts RMS 60 Hz portion and measure less than 0 05 IMD Test 19 Clipping Spec No protective action during test Ini...

Страница 16: ...er Channel CPN Item Quantity Per Channel A10315 1 Screw 6 32 x 56 Hex Washer Head 12 C 8188 2 Output Power Transistor PNP 2 D 6729 4 Output Power Transistor NPN 2 C 7065 3 Output Power Transistor PNP early units 2 C 8573 5 Driver Transistor 2SA1186 PNP 2 C 8574 3 Driver Transistor 2SC2837 NPN 2 M20591 0 Old Style Driver Transistor Assm NPN 2SC2527 2 M20590 2 Old Style Driver Transistor Assm PNP 2S...

Страница 17: ...90 8 Back Panel 1 P10286 6 PIP Interconnect Board 1 Chassis Front Assembly CPN Item Quantity A10031 1 Captive Nut 8 32 x 060 Flush For rack ears 4 A10090 70808 Screw 8 32 x 5 Oval Head For Grille 3 A10101 5 Nylon Washer 5 x 136 x 02 For Grille 3 A10173 1 Clip Filter Grille 3 C 5297 4 Screw 8 32 x 37 For rack ears 4 C 6487 0 Power Switch 2 Pole 22 Amp Rocker 1 D 6944 9 Air Filter 1 45 x 16 23 1 F11...

Страница 18: ... Transformer Mtg 1 F12642 9 Chassis 3 5 1 PIP BB CPN Item Quantity M46011 9 PIP BB Assembly 1 A10086 70806 Screw 8 32 x 37 2 A10094 5 Lockwasher 8 Internal Star Black 2 A10110 10608 Screw 6 32 x 5 4 A10266 2202 Resistor 22 Ohm 5W 2 C 3842 9 Barrier Block 3 Position 2 C 6806 1 Capacitor 01µF 100V 2 C 7161 0 Screw 8 x 1 4 6 PNHD 2 F12553J7 Panel 1 P10343 5 PC Board 1 CT 200 Fan Assembly Optional on ...

Страница 19: ...128 0 as a service replacement Q43013 4 Main Module on D 7911 7 board This module is still available at this time If not then use Q43128 0 as a service replacement Q43044 9 Main Module on D 7993 5 board No longer available Use Q43128 0 as service replacement Q43128 0 Main Module on D 8283 0 board Q43237 9 Main Module on D 8369 7 board Detent Pots Not reverse compatible Control Module Q42762 7 CT 2...

Страница 20: ...801 C 7663 5 Triac MAC224A4 Q900 C 3625 8 PNP 2N4125 Q901 C 3625 8 PNP 2N4125 Q902 C 3625 8 PNP 2N4125 Resistors R700 R800 A10266 1222 1 2K 5W R701 R801 A10266 1812 180 5W R900 A10266 2722 2 7K 5W R901 A10266 1021 1 5K 5W R902 C 7669 2 300 10W R903 C 7669 2 300 10W R904 A10266 3902 39 5W R905 A10266 3602 36 5W ICs U700 U800 C 7664 3 MOC3031 Optotriac U901 C 7665 0 MOC3011 Optotriac U902 C 7665 0 M...

Страница 21: ...25 Q701 Q801 C 7663 5 Triac MAC224A4 Q900 C 3625 8 PNP 2N4125 Q901 C 3625 8 PNP 2N4125 Q902 C 3625 8 PNP 2N4125 Resistors R700 R800 A10266 1222 1 2K 5W R701 R801 A10266 1812 180 5W R900 A10266 2722 2 7K 5W R901 A10266 1021 1 5K 5W R902 C 7669 2 300 10W R903 C 7669 2 300 10W R904 A10266 3902 39 5W R905 A10266 3602 36 5W ICs U700 U800 C 7664 3 MOC3031 Optotriac U901 C 7665 0 MOC3011 Optotriac U902 C...

Страница 22: ...00 C 3625 8 PNP 2N4125 Q901 C 3625 8 PNP 2N4125 Q902 C 3625 8 PNP 2N4125 Resistors R700 R800 A10266 3622 3 6K 5W R701 R801 A10266 1812 180 5W R702 R802 A10266 3622 3 6K 5W R703 R803 A10266 3622 3 6K 5W R900 A10266 2722 2 7K 5W R901 A10266 1021 1 5K 5W R902 C 7669 2 300 10W R903 C 7669 2 300 10W R904 A10266 3902 39 5W R905 A10266 3602 36 5W ICs U700 U800 C 7664 3 MOC3031 Optotriac U901 C 7665 0 MOC...

Страница 23: ...2N4125 Q901 C 3625 8 PNP 2N4125 Q902 C 3625 8 PNP 2N4125 Resistors R700 R800 A10266 3622 3 6K 5W R701 R801 A10266 1812 180 5W R702 R802 A10266 3622 3 6K 5W R703 R803 A10266 3622 3 6K 5W R900 A10266 2722 2 7K 5W R901 A10266 1021 1 5K 5W R902 C 7669 2 300 10W R903 C 7669 2 300 10W R904 A10266 3902 39 5W R905 A10266 3602 36 5W ICs U700 U800 C 7664 3 MOC3031 Optotriac U901 C 7665 0 MOC3011 Optotriac U...

Страница 24: ...1 10K R501 R601 A10266 2221 2 2K R502 R602 A10266 1051 1M R503 R603 A102662751 2 7M R504 R604 A10266 2032 20K 5W R505 R605 A10266 2221 2 2K R506 R606 A10266 4751 4 7M R507 R607 A10266 2221 2 2K R508 R608 A10266 1021 1K R905 A10266 5141 510K R906 A10266 2721 2 7K R907 A10266 5141 510K R908 A10266 3931 39K R909 A10266 3931 39K R910 A10266 4741 470K R911 A10266 3931 39K R912 A10266 1041 100K R913 A10...

Страница 25: ...odule See Output Assembly parts list for these part numbers Resistors R00 C 2626 7 470 R01 C 2872 7 100 R02 C 3299 2 5 6 5W R04 C 6486 2 2 5W R07 C 6486 2 2 5W R09 C 4479 9 22 R10 C 2872 7 100 R11 C 7317 8 2 7 5W R12 C 1001 4 2 7 1W R13 C 2626 7 470 R16 C 6486 2 2 5W R19 C 6486 2 2 5W R21 C 3299 2 5 6 5W R22 C 4479 9 22 R23 C 6844 2 250 Pot LS Bias R24 C 4300 7 13K R25 C 2628 3 2 2K R26 C 6844 2 2...

Страница 26: ...mbly parts list for part numbers Resistors R00 C 2626 7 470 R01 C 2872 7 100 R02 C 7778 1 5 6 5W Flame Proof R04 C 6486 2 2 5W R07 C 6486 2 2 5W R09 C 7779 9 22 Flame Proof R10 C 2872 7 100 R11 C 7317 8 2 7 5W R12 C 1001 4 2 7 1W R13 C 2626 7 470 R16 C 6486 2 2 5W R19 C 6486 2 2 5W R21 C 7778 1 5 6 5W Flame Proof R22 C 7779 9 22 Flame Proof R23 C 6844 2 250 Pot LS Bias R24 C 4300 7 13K R25 C 2628 ...

Страница 27: ...list for part numbers Resistors R00 A10266 4711 470 R01 A10266 1011 100 R04 C 6486 2 2 5W R07 C 6486 2 2 5W R10 A10266 1011 100 R11 A10266 2R73 2 7 1W R12 A10266 2R73 2 7 1W R13 A10266 4711 470 R14 A10266 2R73 2 7 1W R16 C 6486 2 2 5W R19 C 6486 2 2 5W R23 C 6844 2 250 Pot LS Bias R24 A10266 1331 13K R25 A10266 2221 2 2K R26 C 6844 2 250 Pot HS Bias R27 A10266 3911 390 R28 A10266 1331 13K R29 A102...

Страница 28: ...rs Resistors R00 A10266 4711 470 R01 A10266 1011 100 R04 C 6486 2 2 5W R07 C 6486 2 2 5W R10 A10266 1011 100 R11 A10266 2R73 2 7 1W R12 A10266 2R73 2 7 1W R13 A10266 4711 470 R14 A10266 2R73 2 7 1W R16 C 6486 2 2 5W R19 C 6486 2 2 5W R23 C 6844 2 250 Pot LS Bias R24 A10266 1331 13K R25 A10266 2221 2 2K R26 C 6844 2 250 Pot HS Bias R27 A10266 3911 390 R28 A10266 1331 13K R29 A10266 5101 51 R30 A102...

Страница 29: ...49 C 6808 7 470pF C150 C250 C 6806 1 01µF C151 C251 C 6806 1 01µF C152 C252 C 6950 7 82pF 5 C153 C253 C 6804 6 1µF C154 C254 C 8426 6 1µF 250V C155 C255 C 6804 6 1µF C156 C256 C 6804 6 1µF C157 C257 C 6806 1 01µF Diodes D1 C 2851 1 1N4004 D2 C 2851 1 1N4004 D3 C 2851 1 1N4004 D4 C 2851 1 1N4004 D5 C 2851 1 1N4004 D6 C 2851 1 1N4004 D7 C 2851 1 1N4004 D108 D208 C 3181 2 1N4148 D109 D209 C 3181 2 1N...

Страница 30: ...229 A10266 1041 100K R130 R230 A10266 1041 100K R131 R231 A10266 1031 10K R132 R232 C 5062 2 100K Pot ODEP R133 R233 A10266 2741 270K R134 R234 A10266 2032 20K 5W R135 R235 C 7782 3 100 Flame Proof R136 R236 A10266 6821 6 8K R137 R237 C 7782 3 100 Flame Proof R138 R238 A10266 6821 6 8K R139 R239 A10266 8211 820 R140 R240 A10266 6801 68 R141 R241 A10266 1541 150K R142 R242 A10266 1541 150K R143 R24...

Страница 31: ...4711 470 R913 R1013 A10266 1051 1M R914 R1014 A10266 1051 1M R915 R1015 A10266 2201 22 R916 R1016 A10266 2201 22 Switches S2 OPEN S3 C 7960 5 Sensitivity S4 C 6781 6 Switch Stereo Mono IC s U1 C 5095 2 UA7815 U2 C 5096 0 UA7915 U100 U200 C 6911 9 UPA75 U101 U201 C 4345 2 LM339 U102 U202 C 4345 2 LM339 U103 U203 C 6910 1 UPA76 U104 U204 C 7558 7 MC33079P Misc Board D 7911 7 Socket C 3450 1 14 Pin Q...

Страница 32: ... 3 180pF C149 C249 C 6808 7 470pF C150 C250 C 6806 1 01µF C151 C251 C 6806 1 01µF C152 C252 C 6950 7 82pF 5 C153 C253 C 8897 8 1µF C154 C254 C 8426 6 1µF 250V C155 C255 C 8897 8 1µF C156 C256 C 8897 8 1µF C157 C257 C 6806 1 01µF Diodes D1 C 2851 1 1N4004 D2 C 2851 1 1N4004 D3 C 2851 1 1N4004 D4 C 2851 1 1N4004 D5 C 2851 1 1N4004 D6 C 2851 1 1N4004 D7 C 2851 1 1N4004 D108 D208 C 3181 2 1N4148 D109 ...

Страница 33: ...26 R226 C 7782 3 100 Flame Proof R127 R227 A10266 6821 6 8K R128 R228 A10266 1031 10K R129 R229 A10266 1041 100K R130 R230 A10266 1041 100K R131 R231 A10266 1031 10K R132 R232 C 5062 2 100K Pot ODEP R133 R233 A10266 2741 270K R134 R234 A10266 2032 20K 5W R135 R235 C 7782 3 100 Flame Proof R136 R236 A10266 6821 6 8K R137 R237 C 7782 3 100 Flame Proof R138 R238 A10266 6821 6 8K R139 R239 A10266 8211...

Страница 34: ...470 R913 R1013 A10266 1051 1M R914 R1014 A10266 1051 1M R915 R1015 A10266 2201 22 R916 R1016 A10266 2201 22 R917 R1017 A10265 10021 10K 1 R918 R1018 A10265 10021 10K 1 R919 R1019 A10265 10021 10K 1 R920 R1020 A10265 10021 10K 1 R921 R1021 C 9079 2 200 Pot CMR Null Switches S2 OPEN S3 C 7960 5 Sensitivity S4 C 6781 6 Switch Stereo Mono IC s U1 C 5095 2 UA7815 U2 C 5096 0 UA7915 U100 U200 C 6911 9 U...

Страница 35: ...7 470pF C150 C250 C 6806 1 01µF C151 C251 C 6806 1 01µF C152 C252 C 6950 7 82pF 5 C153 C253 C 8897 8 1µF C154 C254 C 8426 6 1µF 250V C155 C255 C 8897 8 1µF C156 C256 C 8897 8 1µF C157 C257 C 6806 1 01µF C158 C258 C 6807 9 001µF C159 C259 C 6807 9 001µF C160 C260 C 6811 1 100pF C161 C261 C 6811 1 100pF Diodes D1 C 2851 1 1N4004 D2 C 2851 1 1N4004 D3 C 2851 1 1N4004 D4 C 2851 1 1N4004 D5 C 2851 1 1N...

Страница 36: ... 20K 5W R124 R224 A10266 6821 6 8K R125 R225 C 7782 3 100 Flame Proof R126 R226 C 7782 3 100 Flame Proof R127 R227 A10266 6821 6 8K R128 R228 A10266 1331 13K R129 R229 A10266 1041 100K R130 R230 A10266 1041 100K R131 R231 A10266 1331 13K R132 R232 C 5062 2 100K Pot ODEP R133 R233 A10266 2741 270K R134 R234 A10266 2032 20K 5W R135 R235 C 7782 3 100 Flame Proof R136 R236 A10266 6821 6 8K R137 R237 C...

Страница 37: ... 1 R920 R1020 A10265 10021 10K 1 R921 R1021 C 9079 2 200 Pot CMR Null R922 R1022 A10265 66501 665 1 R923 R1023 A10265 35711 3 57K 1 R924 R1024 A10265 66501 665 1 R925 R1025 A10265 10031 100K 1 R926 R1026 A10265 66501 665 1 R927 R1027 A10265 10031 100K 1 R928 R1028 A10265 35711 3 57K 1 R929 R1029 A10266 1041 100K R930 R1030 A10266 1041 100K Resistor Networks N101 N201 D 7945 5 Resistor Network N102...

Страница 38: ... 470pF C150 C250 C 6806 1 01µF C151 C251 C 6806 1 01µF C152 C252 C 6950 7 82pF 5 C153 C253 C 8897 8 1µF C154 C254 A10434 104JD 1µF 250V C155 C255 C 8897 8 1µF C156 C256 C 8897 8 1µF C157 C257 C 6806 1 01µF C158 C258 C 6805 3 022µF C159 C259 C 6805 3 022µF C160 C260 C 6811 1 100pF C161 C261 C 6811 1 100pF Diodes D1 C 2851 1 1N4004 D2 C 2851 1 1N4004 D3 C 2851 1 1N4004 D4 C 2851 1 1N4004 D5 C 2851 1...

Страница 39: ...K 5W R124 R224 A10266 6821 6 8K R125 R225 C 8836 6 100 5W Flame Proof R126 R226 C 8836 6 100 5W Flame Proof R127 R227 A10266 6821 6 8K R128 R228 A10266 1331 13K R129 R229 A10266 1041 100K R130 R230 A10266 1041 100K R131 R231 A10266 1331 13K R132 R232 C 5062 2 100K Pot ODEP R133 R233 A10266 2741 270K R134 R234 A10266 2032 20K 5W R135 R235 C 8836 6 100 5W Flame Proof R136 R236 A10266 6821 6 8K R137 ...

Страница 40: ...10265 10021 10K 1 R919 R1019 A10265 10021 10K 1 R920 R1020 A10265 10021 10K 1 R921 R1021 C 9079 2 200 Pot CMR Null R922 R1022 A10265 66501 665 1 R923 R1023 A10265 35711 3 57K 1 R924 R1024 A10265 66501 665 1 R925 R1025 A10265 10031 100K 1 R926 R1026 A10265 66501 665 1 R927 R1027 A10265 10031 100K 1 R928 R1028 A10265 35711 3 57K 1 R929 R1029 A10266 1041 100K R930 R1030 A10266 1041 100K Resistor Netw...

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