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Power Base-3 & 1400CSL Amplifier Service Manual
POWER AMPLIFIER
SERVICE MANUAL
POWER BASE
™
-3 & 1400CSL
™
©1995 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
CSL
™
and Power Base
™
are trademarks, and ODEP
®
and Crown
®
are registered trademarks of Crown International, Inc.
K-SVCPB3
6-95
1
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Table of Contents
Related Manuals for Crown 1400CSL
Summary of Contents for Crown 1400CSL
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Page 1: Power Amplifier
Power Base-3 & 1400CSL Amplifier Service Manual POWER AMPLIFIER SERVICE MANUAL POWER BASE ™ -3 & 1400CSL ™ ©1995 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 ™... - 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
Power Base-3 & 1400CSL Amplifier Service Manual Table of Contents Introduction ... 4 Scope ... 4 Warranty ... 4 Parts Information ... 5 Specifications ... 6 Voltage Conversion ... 7 Circuit Theory ... 8 Electrical Checkout Procedures ... 13 Parts List (Non-Module) ... 16 Module Information ... -
Page 4: Introduction
Note that Crown does not sell blank (unpopulated) circuit boards. Introduction Each of the compact audio power amplifiers are designed for professional or commercial use. -
Page 5: Parts Information
PART NUMBERING SYSTEMS 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
Power Base-3 & 1400CSL Amplifier Service Manual Unless noted otherwise, all specifications are based on driving an 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). -
Page 7: Voltage Conversion
F100, fanformer, and power cord refer to voltage- parts cross-reference. Specific parts are required for the PB-3/1400CSL in order to be used at different international line volt- ages. Refer also to Mechanical Parts Lists. Voltage Specific Parts: 30A Breaker for 100-120V Operation 15A Breaker for 220-240V Operation 0.5A F1, Low Voltage*... -
Page 8: Front End Operation
Technical Notes provided by Crown for this product. This section of the manual explains the general opera- tion of a typical Crown power amplifier. Topics cov- ered include Front End, Grounded Bridge, and ODEP. Due to variations in design from vintage to vintage (and similarities with other Crown products) the theory of operation remains simplified. -
Page 9: Voltage Amplification
Power Base-3 & 1400CSL Amplifier Service Manual output of the amplifier at 26 dB. Diodes prevent overdriving the Error Amp. Because the Error Amp amplifies the difference between input and output signals, any difference in the two waveforms will produce a near open loop gain condition which in turn results in high peak output voltage. - Page 10 Power Base-3 & 1400CSL Amplifier Service Manual ultra low distortion in the signal zero-crossing region and high efficiency. High Side (HS) The High Side (HS) of the bridge operates much like a conventional bipolar push-pull output configuration. As the input drive voltage becomes more positive, the HS NPN conducts and delivers positive voltage to the load.
- Page 11 Power Base-3 & 1400CSL Amplifier Service Manual In other words, the high voltage power supply floats with respect to ground, but ±Vcc remain constant with respect to each other. This allows the power supply to deliver +Vcc and -Vcc from the same bridge rectifier and filter as a total difference in potential, regardless of their voltages with respect to ground.
- Page 12 Power Base-3 & 1400CSL Amplifier Service Manual BALANCED INPUTS Figure 3. Typical Crown Amplifier Basic Block Diagram (One Channel Shown) Theory +VOLTAGE TRANSLATOR ERROR OUTPUT DEVICE EMULATION PROTECTION -VOLTAGE TRANSLATOR INVERTING BRIDGE BALANCE POSITIVE +LVA HIGH SIDE OUTPUT NPN STAGE...
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Page 13: Electrical Checkout Procedures
Power Base-3 & 1400CSL Amplifier Service Manual 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. - Page 14 Power Base-3 & 1400CSL Amplifier Service Manual Electrical Checkout Procedures TEST 6: VOLTAGE GAIN Spec 26dB Gain: ±3%. Spec 0.775V Sensitivity: ±6%. Spec 1.4V Sensitivity: +12%/–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.
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Page 15: Post Testing
Power Base-3 & 1400CSL Amplifier Service Manual Electrical Checkout Procedures TEST 14: ODEP LIMITING Spec: No oscillation on ODEP Limiting wave form; either channel controls limiting in Parallel Mono Mode. Initial Conditions: Controls per standard; rag or other obstruction blocking fan so that it does not turn. -
Page 16: Parts List (Non-Module)
Power Base-3 & 1400CSL Amplifier Service Manual SUPPLIMENTAL ITEMS ITEM D 4137-2 Nylon Thumbscrew Washer C 3342-0 Feet, Black Self-Stick A10087-71012 10-32 .75 Machine (Rack Screw) K80607-3 PB Series Owners Manual POWER SUPPLY ITEM C 9837-3 Breaker, 30A 250VAC (100-120VAC) -
Page 17: Back Panel Assembly
Power Base-3 & 1400CSL Amplifier Service Manual OUTPUT ASSEMBLY (ONE PER CHANNEL) ITEM C 8187-4 NPN Output Device C 8188-2 PNP Output Device C 8573-5 PNP Driver Transistor, TO-3P (2SA1186) C 8574-3 NPN Driver Transistor, TO-3P (2SC2837) D 7665-9 Clip, TO-3P Mounting... -
Page 18: Main Chassis Assembly
Power Base-3 & 1400CSL Amplifier Service Manual MAIN CHASSIS ASSEMBLY ITEM A10086-70806 Screw, 8-32 x .37 RDHD Ph A10086-10604 Screw, 6-32 x .25 RDHD Ph A10094-3 Washer, #6 Black Star A10094-4 Washer, #6 Zinc Star A10094-6 Washer, #8 Black Star... -
Page 19: Module Information
The following is a list of Main and Output modules used up to this date, June 1995. It should be noted that both the PB-3 and the 1400CSL use the same modules. OUTPUT MODULES:... -
Page 20: Q43339-3 Output Module
Power Base-3 & 1400CSL Amplifier Service Manual Q43339-3 Output Module Parts List (P10429-2 Board) Q43339-3 Output Module for PB-3: 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... -
Page 21: Q43353-4 Main Module (Original)
Power Base-3 & 1400CSL Amplifier Service Manual Q43353-4 Main Module Parts List (D 8679-9 Board) Q43353-4 Applicability: Main Module PB-3/1400CSL units. For Schematic See J0659-3. CAPACITORS C 3913-8 470µF C 3913-8 470µF C 6802-0 .47µF C 6806-1 .01µF C 6806-1 .01µF... - Page 22 Power Base-3 & 1400CSL Amplifier Service Manual Q43353-4 Main Module Parts List Cont. (D 8679-9 Board) Q106 Q206 C 3625-8 NPN 2N4125 Q107 Q207 C 3786-8 PNP PN4250 Q108 Q208 C 5891-4 NPN MTS105 Q109 Q209 D 2961-7 NPN 2N3859A...
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Page 23: Integrated Circuits
Power Base-3 & 1400CSL Amplifier Service Manual Q43353-4 Main Module Parts List Cont. (D 8679-9 Board) R164 R264 A10266-4711 R165 R265 A10266-4711 R166 R266 A10266-4711 R167 R267 A10265-10011 1K 1% R168 R268 A10265-10011 1K 1% R170 R270 A10265-10011 1K 1%... -
Page 24: Q43400-3 Main Module
Power Base-3 & 1400CSL Amplifier Service Manual Q43400-3 Main Module Parts List (D 8827-4) Q43400-3 PB-3, 1400CSL MAIN MODULE CAPACITORS C 3913-8 C 3913-8 C 6802-0 C 6806-1 C 6806-1 C 8897-8 C 5362-6 C100 C200 C 5311-3 C101 C201... - Page 25 Power Base-3 & 1400CSL Amplifier Service Manual Q43400-3 Main Module Parts List Cont. (D 8827-4) NETWORK RESISTORS N101A N201A A10265-68111 N101B N201B A10265-32421 N101C N201C A10265-17421 N101D N201D A10265-17421 N101E N201E A10265-32421 N101F N201F A10265-68111 TRANSISTORS Q100 Q200 D 2961-7...
- Page 26 Power Base-3 & 1400CSL Amplifier Service Manual Q43400-3 Main Module Parts List Cont. (D 8827-4) R145 R245 A10266-4711 R146 R246 A10266-1231 R147 R247 C 8836-6 R148 R248 A10266-2721 R149 R249 C 8836-6 R150 R250 A10266-2721 R151 R251 A10266-1231 R152 R252...
- Page 27 Power Base-3 & 1400CSL Amplifier Service Manual Q43400-3 Main Module Parts List Cont. (D 8827-4) U102 U202 C 4345-2 U103 U203 C 6910-1 U104 U204 C 7558-7 U100A U200A OPEN U103A U203A OPEN MISCELLANEOUS Board D 8827-4 Socket C 3450-1...
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