Crown K1 Service Manual
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Crown K1 Service Manual

Crown k series professional audio amplifiers
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See also: Reference Manual , Operating Manual
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B A L A N C E D C U R R E N T A M P L I F I E R
B A L A N C E D C U R R E N T A M P L I F I E R
B A L A N C E D C U R R E N T A M P L I F I E R
B A L A N C E D C U R R E N T A M P L I F I E R
© 1999 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219-
294-8000. K Series amplifiers are produced by Crown International, Inc. Trademark Notice: Balanced
Current Amplifier ™ is a trademark, and Crown
International, Inc. Other trademarks are the property of their respective owners.
K SERIES
K SERIES
K SERIES
K SERIES
K SERIES

Service Manual

PROFESSIONAL AUDIO AMPLIFIERS
PROFESSIONAL AUDIO AMPLIFIERS
PROFESSIONAL AUDIO AMPLIFIERS
PROFESSIONAL AUDIO AMPLIFIERS
PROFESSIONAL AUDIO AMPLIFIERS
Models:
K1, K2
®
and BCA
®
are registered trademarks of Crown
15
13
15
13
15
13
15
13
17
11
17
11
17
11
17
11
Thermal
Thermal
19
9
19
9
19
19
9
9
21
7
21
7
21
21
7
7
Clip
Clip
5
5
25
25
25
5
25
5
IOC
Enable
3
IOC
3
Enable
30
3
30
3
30
30
45
1
45
1
1
1
45
45
Signal
Signal
100
0 dB
100
0 dB
100
0 dB
100
0 dB
1
1 1
2
1
2
KSVCK1K2
03/98
Rev. A

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Summary of Contents for Crown K1

  • Page 1: Service Manual

    PROFESSIONAL AUDIO AMPLIFIERS PROFESSIONAL AUDIO AMPLIFIERS © 1999 by Crown International, Inc., P.O. Box 1000, Elkhart, Indiana 46515-1000 U.S.A. Telephone: 219- 294-8000. K Series amplifiers are produced by Crown International, Inc. Trademark Notice: Balanced Current Amplifier ™ is a trademark, and Crown International, Inc.
  • 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.

  • Page 3: Module Parts

    Rev. A Revision Number None Rev. A ©1999 Crown International, Inc. Revision History Date 3-98 Initial Printing 6-99 Added Revision History, Module and Schematic Information, and Module Parts Sections. Upgraded Manual to Facilitate Component-Level Troubleshooting of PWA’s. Updated Cover Page and Table of Contents.
  • Page 4 Rev. A K Series Service Manual This page intentionally left blank ©1999 Crown International, Inc.

  • Page 5: Table Of Contents

    4 Line Voltage Conversion 4.1 Line Voltage Conversion ... 4-1 5 Maintenance ... 5-1 5.1 Where to Begin ... 5-1 5.2 Disassembly for Inspection & Service ... 5-1 ©1999 Crown International, Inc. Table of Contents ... 2-1 ... 4-1 K Series Service Manual...
  • Page 6 6.2.2 Shipment ... 6-1 7 Exploded View Parts 7.1 General Information ... 7-1 7.2 Main Chassis Assembly ... 7-3 7.3 Front Panel Assembly ... 7-5 7.4 Back Panel Assembly ... 7-7 Table of Contents ... 7-1 Rev. A ©1999 Crown International, Inc.
  • Page 7 Component Map ... 9-57 102176 PWA ... 9-58 Component Map ... 9-62 102175 Assembly ... 9-63 102552 PWA ... 9-65 Component Map ... 9-67 10 Schematics ... 10-1 ©1999 Crown International, Inc. Table of Contents ... 8-1 K Series Service Manual...
  • Page 8 Rev. A K Series Service Manual This page intentionally left blank ©1999 Crown International, Inc.

  • Page 9: Introduction

    1 Introduction 1.1 Introduction This manual contains complete service information on the Crown K1 and K2 power amplifiers. It contains service information for both non-CE and CE (Euro- pean) units. It is designed to be used in conjunction with the Reference Manual; however, some important information is duplicated in this Service Manual in case the Reference Manual is not readily available.

  • Page 10: Repair Strategy

    1.3 Repair Strategy The Balanced Current Amplifier technology rings in a new era in Crown history. Taking full advantage of the modular design approach used in the design of K Se- ries amplifiers, we are able to offer a module exchange program for this product.
  • Page 11 Rev A. K Series Service Manual Figure 1.2 Service Procedure Flow Chart Introduction 1-3 ©1999 Crown International, Inc.
  • Page 12 K Series Service Manual Rev A. This page intentionally left blank 1-4 Introduction ©1999 Crown International, Inc.

  • Page 13: Specifications

    A calibrated rotary level control for each channel lo- cated on the front panel. Each control is labeled from 0 to 100 dB of voltage attenuation. ©1999 Crown International, Inc. K Series Service Manual Power An on/off rocker switch located on the front panel.

  • Page 14: Input/Output

    310–B), 3.5–inch (8.9-cm) height and 16–inch (40.6- cm) depth behind front mounting surface. Weight 32 pounds (14.6 kg). 38 pounds (17.3 kg). Center of gravity approximately 6 inches (15.2-cm) be- hind front mounting surface and left-right centered. ©1999 Crown International, Inc. Rev A.

  • Page 15: Theory

    When S1 is closed and power is first applied the relay K1 is open and current passes through PTC (R1) to the power transformer primary. The PTC restricts the amount of inrush current while the transformer is en- ergizing.

  • Page 16: Input Stage

    Each NAND gate has two inputs: the modulated signal from the high speed comparater section and current limiter signal(U6A). In the event of over current the current limiter (U6A) signal is shut off disabling the NAND ©1999 Crown International, Inc. Rev A.

  • Page 17: Triangle Generator

    U02 (Vp) and U52 (Vn). U02 and U52 are optically coupled gates giving electrical isolation from main module cir- ©1999 Crown International, Inc. K Series Service Manual cuitry. The output of U02 and U52 are then sent to the output MOSTFET drivers.

  • Page 18: Overlap Correction And Adjustment

    (causing erratic operation) U8C switches states disabling the Modulator circuit. 4. Current Limit (U108D). If the amplifiers current limit is exceeded because of low impedances or a short circuit loading, U108D switches states and disables the modulator circuit. ©1999 Crown International, Inc. Rev A.

  • Page 19: Crowbar Circuitry

    Fault circuit in the Crowbar dis- abled condition. In order to clear this latched state the amplifier must be first turned off. ©1999 Crown International, Inc. When the amplifier is turned on the line current con- ducts through the R1 (power supply circuit diagram) until the relay energizes.
  • Page 20 K Series Service Manual Rev A. This Page Intentionally Left Blank 3-6 Theory ©1999 Crown International, Inc.

  • Page 21: Line Voltage Conversion

    Voltage Plug (P7), a 9 pin connector plug on the Con- trol PWA. Refer to Figure 4.1 for the Crown Part Num- ber of the plug you need. These plugs are available from the Crown Parts Department.
  • Page 22 K Series Service Manual Rev A. This page intentionally left blank 4-2 Line Voltage Conversion ©1999 Crown International, Inc.

  • Page 23: Maintenance

    ESD protection. Proper grounding straps and test equipment are required. Failure to use proper protection will result in component failure. ©1999 Crown International, Inc. K Series Service Manual 5.2 Disassembly for Inspection & Service The extent of disassembly required will depend upon the extent of inspection and service required.

  • Page 24: Power Supply Discharge

    Main PWA will be shorted to chassis. 5. Remove the two TX15 screws on the Main PWA. See Figure 5.2. Item B 6. Unplug the black and white wires (P8 & P9) and the ribbon cable (P4) from the Control PWA. See Figure 5.2. Item C 7.

  • Page 25: Front Panel Assembly Removal

    2. Using a TX 15 bit, remove two screws on each side of the amp located directly behind the rack ears. See Figure 5.2. Item G 3. Remove the four TX 15 screws along the top front of the amplifier.

  • Page 26: Output Pwa Removal

    4. Lift the Line Filter PWA out of the chassis. 5.2.10 Power Transformer Removal The Front Panel Assembly must be removed in order to remove the Power Transformer. 1. Follow the instructions in Section 5.2.2. Supply discharge is necessary to avoid circuit damage. Rev A. ©1999 Crown International, Inc.

  • Page 27: Display Pwa Removal

    Also remove the flat washers. Bridge PWA Output PWA Main PWA ©1999 Crown International, Inc. 4. Lift the Display PWA out of the Front Panel Assem- bly. 5.2.12 Bridge PWA Removal The Front Panel Assembly must be removed in order to remove the Bridge PWA.

  • Page 28: Troubleshooting

    AC line voltage is correct for the amplifier you are working on. Severely low AC line voltage could cause the amp to not power up. If both check out, then the amplifier is in a fault mode. The two most likely areas are the Main PWA or an Output PWA.
  • Page 29 No Signal; one or both channels. Enable on. IOC on. A constant IOC condition indicates a problem in the signal path including the Error Amp circuit. This in- cludes the Main and Output PWA’s. The problem most likely exists on the Main PWA.

  • Page 30: Required Test Equipment

    Control PWA. It should measure approximately 5 ohms. If it is shorted then replace it. Another possibility is that the relay (K1) has failed. If the amplifier trips breakers and you can never get it powered up, Discharge the supplies, then check the bridge rectifiers (D1 and D2) at the Bridge PWA lo- cated in the Front Panel Assembly.

  • Page 31: Electrical Checkout Procedures

    ©1999 Crown International, Inc. K1 Procedure: No Load. With the level controls at full gain and the input sensitivity switches set to 1.4 V, inject a 1 kHz, 0.775 Vrms, into each channel. At the output of each channel measure 29.3 Vrms, ±0.9 Vrms.

  • Page 32: Frequency Response

    0.1% TRUE THD. Measure at least 46.9 Vrms at the output. K1 Procedure 2 ohm: Due to the duty cycle of a test signal, the line fuse will blow if both channels are tested at the same time. When testing 2-ohm power, test one channel at a time.

  • Page 33: Post Test Settings

    (see Figure 5.1). Figure 5.2 shows “Underlap” (under adjustment). Figure 5.3 shows “Overlap” (over adjustment). If too much time is taken ©1999 Crown International, Inc. K Series Service Manual to perform this procedure the Sleep circuit may cause the amplifier to go into standby.
  • Page 34 K Series Service Manual Rev A. This page intentionally left blank 5-12 Maintenance ©1999 Crown International, Inc.

  • Page 35: Parts

    The parts listed are current as of the date printed. Crown reserves the right to modify and improve its products for the benefit of its customers. Crown is not a general parts warehouse. Parts sold by the Crown Parts Department are solely for servicing Crown/Amcron products.
  • Page 36 K Series Service Manual Rev A. This Page Intentionally Left Blank 6-2 Parts ©1999 Crown International, Inc.

  • Page 37: Exploded View Parts

    This chapter includes a mechanical part list for this product. All serviceable parts and assemblies will have a Crown Part Number (CPN) listed in this chapter. The parts listed are current as of the date printed. Crown reserves the right to modify and improve its products for the benefit of its customers.
  • Page 38 K Series Service Manual Rev A. Front Panel Assembly Chassis Control PWA Output PWA Main Wiring Harness Back Panel Assembly Figure 7.1 View of Main Chassis from Bottom 7-2 Exploded View Parts ©1999 Crown International, Inc.

  • Page 39: Main Chassis Assembly

    Screw, 8-32X.312 Flt Hd T15 Screw, 8-32X.5 Flt Hd T15 Lockwasher, CSK Ext Tooth #8 Wire, Pwr Switch Violet Wire Pwr Switch Orange Main Wiring Harness ©1999 Crown International, Inc. 7.2 Main Chassis Assembly Part # (CPN) 102226-X — —...
  • Page 40 K Series Service Manual Rev A. Figure 7.2 Front Panel Assembly Exploded View 7-4 Exploded View Parts ©1999 Crown International, Inc.

  • Page 41: Front Panel Assembly

    Screw, 1/4-20 x 2.0 FLTHD T27 Belleville Washer, #8 Screw, 8-32 x .5 UC FLTHD T15 Front Panel Overlay, Set, K2 Front Panel Overlay, Set, K1 Front Panel 5K Ohm Vol Pot Hardware Feet, Selfstick Black ©1999 Crown International, Inc. 7.3 Front Panel Assembly Refer to figure 7.2 for Exploded View...
  • Page 42 K Series Service Manual Rev A. Figure 7.3 Back Panel Assembly Exploded View 7-6 Exploded View Parts ©1999 Crown International, Inc.

  • Page 43: Back Panel Assembly

    Rev A. Item # Description Back Panel, K2 Back Panel, K1 Main PCA Input PCA, K1 Input PCA, K2 Line Filter PWA Lockwasher, #6 Int. Star Terminal, Dual Binding Post Screw, 6-32 X .375 PNHD T15 8-32 Hex Nut Fuseholder, 3AG–Scrdvr–Slot...

  • Page 44: Schematics

    Parts lists and schematics for Main, Output, and In- put PWAs are included begining with current produc- tion PWAs as of Revision A of this manual. Call the Crown Technical Support Group if you require a parts list or schematic for a module not included in this manual.

  • Page 45: Schematics

    101014-1 Line Filter PWA built on 101013-1 PWB. 101014-2 Line Filter PWA built on 101013-2 PWB. Replaced 101014- ©1999 Crown International, Inc. K Series Service Manual 8.3 Schematic Diagrams 8.3.1 Main PWA For PWA 100497-5 refer to schematic 100495 G.
  • Page 46 K Series Service Manual Rev. A This page left intentionally blank Module and Schematic Information 8-3 ©1999 Crown International, Inc.

  • Page 47: Module Parts

    All serviceable parts and assemblies will have a Crown Part Number (CPN) listed in this chapter. The parts listed are current as of the date printed. Crown reserves the right to modify and improve its products for the benefit of its customers.
  • Page 48 K Series Service Manual Rev A. 9-2 Module Parts ©1999 Crown International, Inc.
  • Page 49 Rev A. K Series Service Manual Module Parts 9-3 ©1999 Crown International, Inc.
  • Page 50 K Series Service Manual Rev A. 9-4 Module Parts ©1999 Crown International, Inc.
  • Page 51 Rev A. K Series Service Manual Module Parts 9-5 ©1999 Crown International, Inc.

  • Page 52: Component Map

    K Series Service Manual Rev A. 100438-3 Component Map (Component Side of Module) 9-6 Module Parts ©1999 Crown International, Inc.
  • Page 53 Rev A. K Series Service Manual Module Parts 9-7 ©1999 Crown International, Inc.

  • Page 54: Assembly

    K Series Service Manual Rev A. View of Inductor Pair, CPN H43507-5, for Output Assembly CPN 101554 9-8 Module Parts ©1999 Crown International, Inc.
  • Page 55 Rev A. K Series Service Manual Module Parts 9-9 ©1999 Crown International, Inc.
  • Page 56 K Series Service Manual Rev A. 9-10 Module Parts ©1999 Crown International, Inc.
  • Page 57 Rev A. K Series Service Manual Module Parts 9-11 ©1999 Crown International, Inc.
  • Page 58 K Series Service Manual Rev A. 9-12 Module Parts ©1999 Crown International, Inc.
  • Page 59 Rev A. K Series Service Manual Module Parts 9-13 ©1999 Crown International, Inc.
  • Page 60 K Series Service Manual Rev A. 9-14 Module Parts ©1999 Crown International, Inc.
  • Page 61 Rev A. K Series Service Manual Module Parts 9-15 ©1999 Crown International, Inc.
  • Page 62 K Series Service Manual Rev A. 9-16 Module Parts ©1999 Crown International, Inc.
  • Page 63 Rev A. K Series Service Manual Module Parts 9-17 ©1999 Crown International, Inc.
  • Page 64 K Series Service Manual Rev A. 9-18 Module Parts ©1999 Crown International, Inc.
  • Page 65 Rev A. K Series Service Manual Module Parts 9-19 ©1999 Crown International, Inc.
  • Page 66 K Series Service Manual Rev A. 9-20 Module Parts ©1999 Crown International, Inc.
  • Page 67 Rev A. K Series Service Manual Module Parts 9-21 ©1999 Crown International, Inc.
  • Page 68 K Series Service Manual Rev A. 9-22 Module Parts ©1999 Crown International, Inc.
  • Page 69 Rev A. K Series Service Manual Module Parts 9-23 ©1999 Crown International, Inc.
  • Page 70 K Series Service Manual Rev A. 9-24 Module Parts ©1999 Crown International, Inc.
  • Page 71 Rev A. K Series Service Manual Module Parts 9-25 ©1999 Crown International, Inc.
  • Page 72 K Series Service Manual Rev A. 9-26 Module Parts ©1999 Crown International, Inc.
  • Page 73 Rev A. K Series Service Manual Module Parts 9-27 ©1999 Crown International, Inc.
  • Page 74 K Series Service Manual Rev A. This Page Intentionally Left Blank 9-28 Module Parts ©1999 Crown International, Inc.

  • Page 75: Component Map

    Rev A. K Series Service Manual 100497-5 PWA Component Map (Component Side) Module Parts 9-29...
  • Page 76 K Series Service Manual Rev A. This Page Intentionally Left Blank 9-30 Module Parts...
  • Page 77 Rev A. K Series Service Manual Module Parts 9-31 ©1999 Crown International, Inc.
  • Page 78 K Series Service Manual Rev A. 9-32 Module Parts ©1999 Crown International, Inc.
  • Page 79 Rev A. K Series Service Manual Module Parts 9-33 ©1999 Crown International, Inc.
  • Page 80 K Series Service Manual Rev A. 9-34 Module Parts ©1999 Crown International, Inc.
  • Page 81 Rev A. K Series Service Manual Module Parts 9-35 ©1999 Crown International, Inc.
  • Page 82 K Series Service Manual Rev A. 9-36 Module Parts ©1999 Crown International, Inc.
  • Page 83 Rev A. K Series Service Manual Module Parts 9-37 ©1999 Crown International, Inc.
  • Page 84 K Series Service Manual Rev A. 9-38 Module Parts ©1999 Crown International, Inc.
  • Page 85 Rev A. K Series Service Manual 100524-6 PWA Component Map (Component Side) Module Parts 9-39 ©1999 Crown International, Inc.
  • Page 86 K Series Service Manual Rev A. 9-40 Module Parts ©1999 Crown International, Inc.
  • Page 87 Rev A. K Series Service Manual Module Parts 9-41 ©1999 Crown International, Inc.
  • Page 88 K Series Service Manual Rev A. 9-42 Module Parts ©1999 Crown International, Inc.
  • Page 89 Rev A. K Series Service Manual Module Parts 9-43 ©1999 Crown International, Inc.
  • Page 90 K Series Service Manual Rev A. 9-44 Module Parts ©1999 Crown International, Inc.
  • Page 91 Rev A. K Series Service Manual Module Parts 9-45 ©1999 Crown International, Inc.
  • Page 92 K Series Service Manual Rev A. 9-46 Module Parts ©1999 Crown International, Inc.
  • Page 93 Rev A. K Series Service Manual Module Parts 9-47 ©1999 Crown International, Inc.
  • Page 94 K Series Service Manual Rev A. 9-48 Module Parts ©1999 Crown International, Inc.
  • Page 95 Rev A. K Series Service Manual Module Parts 9-49 ©1999 Crown International, Inc.
  • Page 96 K Series Service Manual Rev A. 9-50 Module Parts ©1999 Crown International, Inc.
  • Page 97 Rev A. K Series Service Manual 101809-4 PWA Component Map (Component Side) Module Parts 9-51 ©1999 Crown International, Inc.
  • Page 98 K Series Service Manual Rev A. 9-52 Module Parts ©1999 Crown International, Inc.
  • Page 99 Rev A. K Series Service Manual Module Parts 9-53 ©1999 Crown International, Inc.
  • Page 100 K Series Service Manual Rev A. 9-54 Module Parts ©1999 Crown International, Inc.
  • Page 101 Rev A. K Series Service Manual Module Parts 9-55 ©1999 Crown International, Inc.
  • Page 102 K Series Service Manual Rev A. 9-56 Module Parts ©1999 Crown International, Inc.
  • Page 103 Rev A. K Series Service Manual Module Parts 9-57 ©1999 Crown International, Inc.
  • Page 104 K Series Service Manual Rev A. 9-58 Module Parts ©1999 Crown International, Inc.
  • Page 105 Rev A. K Series Service Manual Module Parts 9-59 ©1999 Crown International, Inc.
  • Page 106 K Series Service Manual Rev A. 9-60 Module Parts ©1999 Crown International, Inc.
  • Page 107 Rev A. K Series Service Manual Module Parts 9-61 ©1999 Crown International, Inc.
  • Page 108 K Series Service Manual Rev A. 102176-2 PWA Component Map (Component Side of Module) 9-62 Module Parts ©1999 Crown International, Inc.
  • Page 109 Rev A. K Series Service Manual Module Parts 9-63 ©1999 Crown International, Inc.

  • Page 110: Assembly

    K Series Service Manual Rev A. View of Inductor Pair, CPN H43507-5, for Output Assembly CPN 102175-2 9-64 Module Parts ©1999 Crown International, Inc.
  • Page 111 Rev A. K Series Service Manual Module Parts 9-65 ©1999 Crown International, Inc.
  • Page 112 K Series Service Manual Rev A. 9-66 Module Parts ©1999 Crown International, Inc.
  • Page 113 Rev A. K Series Service Manual Module Parts 9-67 ©1999 Crown International, Inc.
  • Page 114 K Series Service Manual Rev A. This Page Intentionally Left Blank 9-68 Module Parts ©1999 Crown International, Inc.

  • Page 115: Schematic Diagrams

    100436 Rev D 100442 Rev C 100495 Rev G 100522 Rev M 101012 Rev B 101848 Rev B 101946 Rev F 102195 Rev C 102550 Rev A Schematics 10-1 ©1999 Crown International, Inc.
  • Page 116 K Series Service Manual Rev A. This Page Intentionally Left Blank 10-2 Schematics ©1999 Crown International, Inc.

This manual is also suitable for:

K2

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