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Com-Tech 1600 Amplifier Service Manual
POWER AMPLIFIER
SERVICE MANUAL
COM-TECH
®
1600
Model CT1600B
©1996 by CROWN INTERNATIONAL, INC.
Mailing Address:
Shipping Address:
P.O. Box 1000
57620 C.R. 105
Elkhart, IN U.S.A. 46515-1000
Elkhart, IN U.S.A. 46517
Com-Tech
®
, ODEP
®
and Crown
®
are registered trademarks of Crown International, Inc.
K-SVCCT1600
1-96
1
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Table of Contents
Related Manuals for Crown Com-Tech CT-1600
Summary of Contents for Crown Com-Tech CT-1600
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Page 1: Power Amplifier
©1996 by CROWN INTERNATIONAL, INC. Mailing Address: Shipping Address: P.O. Box 1000 57620 C.R. 105 Elkhart, IN U.S.A. 46515-1000 Elkhart, IN U.S.A. 46517 Com-Tech ® , ODEP ® and Crown ® are registered trademarks of Crown International, Inc. K-SVCCT1600 1-96... - 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 Technical Support Group.
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Page 3: Table Of Contents
Com-Tech 1600 Amplifier Service Manual Table of Contents Introduction ... 4 Parts Information ... 5 Specifications ... 6 Theory ... 7 Electrical Checkout Procedures ... 12 Parts List (Non Module) ... 16 Module and Schematic Information ... 19 Q42828-6 Control Module Parts List ... 20 Q43213-0 Control Module Parts List ... -
Page 4: Introduction
Because most Crown products carry a 3 Year Full Warranty (including round trip shipping within the United States), all warranty service should be referred to the Crown Factory or Authorized Warranty Service Center. -
Page 5: Parts Information
Part Numbering System As of the printing of this manual, Crown is using two numbering systems. The elder system always uses eight characters. The first character is a letter. Com- mon letters used are C, D, H, M, P, and Q. -
Page 6: Specifications
8 ohm load per channel, both channels driven, the sensitivity switch in the 26dB position, the AC supply is 120VAC at 60Hz. Crown specifications are guaranteed through the warranty period (normally 3 years). Because our testing methods are more strin- gent than our published specifications, every Crown amplifier will exceed its published specifications. -
Page 7: Theory
Overview It should be noted that over time Crown makes im- provements and changes to their products for various reasons. This manual is up to date as of the time of writing. For additional information regarding these amplifiers, refer to the applicable Technical Notes provided by Crown for this product. - Page 8 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 amplifier output. The Voltage Translators are arranged in a common base configuration for non-inverting voltage gain with equal gain.
- Page 9 (no signal) conditions. This is because PNP devices require greater drive current. Figure 2. Crown Patented Grounded Bridge Topology Com-Tech 1600 Amplifier Service Manual Theory HS bias is regulated by Q18, the Bias Servo. Q18 is a Vbe multiplier which maintains approximately 3.3V...
- Page 10 AB+B in the same manner as the HS. When the amplifier output swings positive, the audio is fed to an op-amp stage where it is inverted. This inverted signal is delivered directly to the bases of the positive (NPN) and negative (PNP) LS predrivers. The negative drive forces the LS PNP devices on (NPN off).
- Page 11 Com-Tech 1600 Amplifier Service Manual ERROR BALANCED INPUTS Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown) Theory +VOLTAGE TRANSLATOR OUTPUT DEVICE EMULATION PROTECTION -VOLTAGE TRANSLATOR MAIN NEGATIVE FEEDBACK (NFb) LOOP INVERTING BRIDGE BALANCE POSITIVE +LVA HIGH SIDE...
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Page 12: Electrical Checkout Procedures
Electrical Checkout Procedures General Information The following test procedures are to be used to verify operation of this amplifier. DO NOT connect a load or inject a signal unless directed to do so by the proce- dure. These tests, though meant for verification and alignment of the amplifier, may also be very helpful in troubleshooting. - Page 13 4. Increase output level until current limit oc- curs. Current limit should occur at 39 ±6 Amps (39 Vpk). Observe clean (no oscillations) current clipping. Test 10: Slew Rate & 10 KHz Square Wave Spec: 17 - 25 V/µS, 8 ohm load. Initial Conditions: Controls per standard.
- Page 14 Electrical Checkout Procedures Test 12: Output Power Spec at 8 Ohm Stereo: 540 Watts/Ch at 0.1% THD Spec at 4 Ohm Stereo: 850 Watts/Ch at 0.1% THD Spec at 70-V Mode, Stereo: 875 Watts/Ch at 0.1% THD Initial Conditions: Controls per standard Procedure: Load each channel to 8 ohms.
- Page 15 Com-Tech 1600 Amplifier Service Manual Electrical Checkout Procedures Test 18: Intermodulation Distortion Spec at 0 dB output: 0.01%. Spec at -35 dB output: 0.05%. Initial Conditions: Controls per standard. 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).
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Page 16: Parts List (Non Module)
Mounting Clip, TO3P (For Drivers) D 7666-7 Mounting Bracket, TO3P (For Drivers) D 7796-2 Sil Pad, 2.87 x 14.57 (Between Heatsink & Chassis) D 6280-8 Sil Pad for use with Output Board P10315-3 D 6104-0 Sil Pad for use with Output Board P10233-8... - Page 17 Nylon Washer, .5 x .136 x .02 (For Grille) A10173-1 Clip, Filter Grille C 5297-4 Screw, 8-32 x .37 (For rack ears) C 6487-0 Power Switch, 2 Pole 22 Amp Rocker D 7119-7 Air Filter, 4.9 x 16.23 F11574J4 Front Panel Overlay F12708-8...
- Page 18 Main Chassis Assembly Cont. Item D 7249-2 Label, 3 Position Voltage Gain D 8501-5 Cover A10086-10606 Screw, 6-32 x .375 A10086-70806 Screw, 8-32 x .37 A10094-6 Washer, #8 Internal Star A10099-7 Shoulder Washer, #10 Nylon A10109-10822 Screw, 8-18 x 1.375 A10110-70812 8-32 x .750 Taptite A10102-5...
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Page 19: Module And Schematic Information
Module and Schematic Information Module History The Com Tech 1600B amplifier was introduced in 1990. Since then there have been several updates and revisions, some of which called for new modules. The following is a list of all modules used up to this date, January 1996. -
Page 20: Q42828-6 Control Module Parts List
Q42828-6 Control Module (P10251-0 board) Parts Lists Capacitors C700 C800 C 8426-6 .1µF 250V C701 C801 C 8426-6 .1µF 250V C900 C 8963-8 .47µF 250V Diodes D700 D800 C 3181-2 1N4148 D900 C 2851-1 1N4004 Relays C 7860-7 SPST Transistors Q700 Q800 C 3625-8... -
Page 21: Q43213-0 Control Module Parts List
Q43213-0 Control Module (P10404-5 board) Parts List Capacitors C700 C800 C 8426-6 .1µF 200V C701 C801 C 8426-6 .1µF 200V C900 C 8963-8 .47µF 250V C901 C 8511-5 .047µF 250V Diodes D700 D800 C 3181-2 1N4148 D900 C 2851-1 1N4004 Relays C 7860-7 SPST... -
Page 22: Q43241-1 Control Module Parts List
Q43241-1 Control Module (P10405-2 board) Parts List Capacitors C700 C800 C 8426-6 .1µF 250V C701 C801 C 8426-6 .1µF 250V C900 C 8963-8 .47µF 250V Diodes D700 D800 C 3181-2 1N4148 D900 C 2851-1 1N4004 Relays C 7860-7 SPST Transistors Q700 Q800 C 3625-8... -
Page 23: Q42706-4 Display Module Parts List
Q42706-4 Display Module (D 7083-5 board) Parts List Capacitors C500 C600 C 6802-0 .47µF 50V C901 C 6804-6 .1µF 50V Diodes D500 D600 C 3181-2 1N4148 D501 D601 C 3181-2 1N4148 D900 C 3533-4 1N966B 16V Zener D901 C 3533-4 1N966B 16V Zener LED's E500... -
Page 24: Q42758-5 Output Module Parts List
Q42758-5 Output Module (P10233-8 or P10263-5 board) Parts List Capacitors C 3978-1 .047µF C 2938-6 .1µF C 2938-6 .1µF C 6806-1 .01µF C 6806-1 .01µF C 6806-1 .01µF C 6807-9 .001µF C 6809-5 220pF C 6810-3 180pF Diodes C 2851-1 1N4004 C 2851-1 1N4004... -
Page 25: Q42889-8 Output Module Parts List
Q42889-8 Output Module (P10315-3 board) Parts List Capacitors C 8511-5 .047µF 250V Ax C 8426-6 .1µF C 8426-6 .1µF C 6806-1 .01µF C 6806-1 .01µF C 6806-1 .01µF C 6807-9 .001µF C 6809-5 220pF C 6810-3 180pF Diodes C 2851-1 1N4004 C 2851-1 1N4004... -
Page 26: Q42973-0 Output Module Parts List
Q42973-0 Output Module (P10337-7 board) Parts List Capacitors C 8511-5 .047µF C 8426-6 .1µF C 8426-6 .1µF C 6806-1 .01µF C 6806-1 .01µF C 6806-1 .01µF C 6807-9 .001µF C 6810-3 180pF C 6809-5 220pF C 7697-3 .01µF Diodes C 2851-1 1N4004 C 2851-1 1N4004... -
Page 27: Q43051-4 Output Module Parts List
Q43051-4 Output Module (P10337-7 board) Parts List Capacitors C 8511-5 .047µF 250V Ax C 8426-6 .1µF C 8426-6 .1µF C 6806-1 .01µF 100V Ax C 6806-1 .01µF 100V Ax C 6806-1 .01µF 100V Ax C 6807-9 .001µF 100V Ax C 6810-3 180pF C 6809-5 220pF... -
Page 28: Q43192-6 Output Module Parts List
Q43192-6 Output Module (P10396-3 board) Parts List Cont. Capacitors C 8511-5 .047µF 250V Ax C 8426-6 .1µF C 8426-6 .1µF C 6806-1 .01µF 100V Ax C 6806-1 .01µF 100V Ax C 6806-1 .01µF 100V Ax C 6807-9 .001µF 100V Ax C 6810-3 180pF C 6809-5... -
Page 29: Q42782-5 Main Module Parts List
Q42782-5 Main Module (D 7222-9 board) Parts List Capacitors C 4303-1 1000µF C 3913-8 470µF C 4303-1 1000µF C 6802-0 .47µF A10124-24 Jumper Wire A10124-24 Jumper Wire C 8897-8 .1µF C100 C200 C 8026-4 100µF C101 C201 C 3409-7 47pF C103 C203 C 6805-3... - Page 30 Q42782-5 Main Module (D 7222-9 board) Parts List Resistors (.25W 5% unless noted otherwise) N100 N200 C 4669-4 Resistor Network N101 N201 D 6081-0 Resistor Network N102 N202 D 6082-8 Resistor Network A10265-10021 10K 1% OPEN OPEN A10265-10521 10.5K 1% A10266-1041 100K A10266-2031...
- Page 31 Q42782-5 Main Module (D 7222-9 board) Parts List R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294 A10266-2031 R195 R295 A10266-4701 R196 R296 A10266-4721 4.7K R197 R297 A10266-1031 R198 R298 A10266-4721 4.7K R199 R299 A10266-1031...
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Page 32: Q42919-3 Main Module Parts List
Q42919-3 Main Module (D 7605-5 board) Parts List Capacitors C 4303-1 1000µF C 3913-8 470µF C 4303-1 1000µF C 6802-0 .47µF A10124-24 Jumper Wire A10124-24 Jumper Wire C 6804-6 .1µF C100 C200 C 5311-3 22µF C101 C201 C 2821-4 10pF C103 C203 C 6805-3... - Page 33 Q42919-3 Main Module (D 7605-5 board) Parts List Q121 Q221 C 7458-0 NPN 2N4123 Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 Resistors (.25W 5% unless noted otherwise) N100 N200 C 4669-4 Resistor Network N101...
- Page 34 Q42919-3 Main Module (D 7605-5 board) Parts List R184 R284 A10266-4741 470K R185 R285 A10266-2421 2.4K R186 R286 A10266-2751 2.7M R187 R287 A10266-3631 R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294...
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Page 35: Q43010-0 Main Module Parts List
Q43010-0 Main Module (D 7911-7 board) Parts List Capacitors C 4303-1 1000µF C 3913-8 470µF C 6802-0 .47µF A10124-24 Jumper Wire A10124-24 Jumper Wire C 6804-6 .1µF C100 C200 C 5311-3 22µF C101 C201 C 2821-4 10pF C103 C203 C 6805-3 .022µF C104 C204... - Page 36 Q43010-0 Main Module (D 7911-7 board) Parts List Q120 Q220 C 3625-8 NPN 2N4125 Q121 Q221 C 7458-0 NPN 2N4123 Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 Resistors (.25W 5% unless noted otherwise) N100 N200 D 4669-4...
- Page 37 Q43010-0 Main Module (D 7911-7 board) Parts List R186 R286 A10266-2751 2.7M R187 R287 A10266-3631 R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294 A10266-1041 100K R195 R295 A10266-3021 R196 R296 A10266-4721...
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Page 38: Q43041-5 Main Module Parts List
Q43041-5 Main Module (D 7993-5 board) Parts List Capacitors C 4303-1 1000µF C 3913-8 470µF C 6802-0 .47µF A10124-24 Jumper Wire A10124-24 Jumper Wire C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 2821-4 10pF C103 C203 C 6805-3 .022µF C104 C204... - Page 39 Q43041-5 Main Module (D 7993-5 board) Parts List Q120 Q220 C 3625-8 NPN 2N4125 Q121 Q221 C 7458-0 NPN 2N4123 Q122 Q222 C 7458-0 NPN 2N4123 Q123 Q223 C 7458-0 NPN 2N4123 Q124 Q224 C 3625-8 NPN 2N4125 Resistors (.25W 5% unless noted otherwise) N101 N201...
- Page 40 Q43041-5 Main Module (D 7993-5 board) Parts List R186 R286 A10266-2751 2.7M R187 R287 A10266-3631 R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191 R291 A10266-3331 R192 R292 A10266-1031 R193 R293 A10266-1031 R194 R294 A10266-1041 100K R195 R295 A10266-3021 R196 R296 A10266-4721...
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Page 41: Q43131-4 Main Module Parts List
Q43131-4 Main Module (D8283-0 board) Parts List Capacitors C 4303-1 1000µF C 3913-8 470µF C 6802-0 .47µF A10124-24 Jumper Wire A10124-24 Jumper Wire C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 9464-6 10pF C103 C203 C 6805-3 .022µF C104 C204... - Page 42 Q43131-4 Main Module (D8283-0 board) Parts List Q113 Q213 C 3625-8 NPN 2N4125 Q115 Q215 D 2962-5 NPN MPS8097 Q116 Q216 C 3786-8 PNP PN4250 Q117 Q217 D 2961-7 NPN 2N3859A Q118 Q218 D 2961-7 NPN 2N3859A Q119 Q219 C 3625-8 NPN 2N4125 Q120 Q220...
- Page 43 Q43131-4 Main Module (D8283-0 board) Parts List R181 R281 A10266-4721 4.7K R182 R282 A10266-2201 R183 R283 A10266-2421 2.4K R184 R284 A10266-4741 470K R185 R285 A10266-2421 2.4K R186 R286 A10266-2751 2.7M R187 R287 A10266-3631 R188 R288 A10266-3631 R189 R289 A10266-2731 R190 R290 A10266-2051 R191...
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Page 44: Q43240-3 Main Module Parts List
Q43240-3 Main Module (D 8369-7 board) Parts List Capacitors C 9859-7 1000µF C 9859-7 1000µF C 6802-0 .47µF A10124-24 Jumper Wire A10124-24 Jumper Wire C 8897-8 .1µF C100 C200 C 5311-3 22µF C101 C201 C 9464-6 10pF C103 C203 C 6805-3 .022µF C104 C204... - Page 45 Q43240-3 Main Module (D 8369-7 board) Parts List Q113 Q213 C 3625-8 NPN 2N4125 Q115 Q215 D 2962-5 NPN MPS8097 Q116 Q216 C 3786-8 PNP PN4250 Q117 Q217 D 2961-7 NPN SPS8010 Q118 Q218 D 2961-7 NPN SPS8010 Q119 Q219 C 3625-8 NPN 2N4125 Q120...
- Page 46 Q43240-3 Main Module (D 8369-7 board) Parts List R180 R280 A10266-4711 R181 R281 A10266-4721 4.7K R182 R282 A10266-2201 R183 R283 A10266-2421 2.4K R184 R284 A10266-4741 470K R185 R285 A10266-2421 2.4K R186 R286 A10266-2751 2.7M R187 R287 A10266-3631 R188 R288 A10266-3631 R189 R289 A10266-2731...