Crown Macro-Tech 5002VZ Manuel de service Page 35
- Page / 140
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Maintenance 5-7
130446-1 Rev. A
MA-5002VZ Service Manual
©2000 Crown International, Inc.
WARNING: Many of the following checks are done by connecting a resistive load to the output of the
amplifier. Use caution and follow check-out procedures carefully to ensure correct results. These
tests require a resistive load capable of over 3000 W continuous into as low as 1 ohm.
WARNING: The MA-5002VZ is capable of drawing in excess of 80 Amperes of current from 120VAC
Mains when loaded to 2 ohms per channel and with both channels driven by a 1 kHz sine wave.
CAUTION: 30 A fuses should be replaced after completion of tests, as they will be stessed during high
power tests. Special 30 A test fuses may be used during testing if they are replaced with the stock
fuses after the tests. 30 A fuse part number is A10285-30.
With the sensitivity switch in the high gain position
(0.775V), insert a common mode 1-kHz 0 dBu square
wave into channel 1 (phono tip & ring shorted or XLR
pins 2 and 3 shorted). At the output jacks measure
less than 25 mV. If necessary adjust R105. Repeat
test for channel 2, adjust R205 if necessary. This ad-
justment is easiest when done with an oscilloscope
at the output and adjusting the square wave for a flat
line. (Set scope for high vertical sensitivity.)
Set the sensitivity switches to the 26-dB position,
check both level controls full clockwise. Insert a .775V
1-kHz sine wave and measure 14.8V–16.1V at the out-
put of each channel. Set sensitivity to the 0.775V po-
sition and measure 95V–104V at the output of each
channel. Set the sensitivity switches to 1.4V position
and measure 51.8V–57.2V at the output of each chan-
nel.
Note: Always turn power to the amplifier off prior to
changing the position of the Stereo/Mono Switch.
With
the dual/mono switch in the bridge mono position, set
the channel two input level control to full CCW. Insert
a .775 Vrms 1-kHz signal into channel one input. There
should be signal present on both channel outputs,
equal in amplitude, with channel two 180 degrees out
of polarity from channel one (see Figure 5.2). Chan-
nel one input level control should control the output
level for both channels. Return the amplifier to stereo
operation.
7. CMR Null 0.775V (0 dBu),
1-kHz Sq. Wave
No Load
8. Sensitivity (Gain) 1-kHz Sine Wave
No Load
9. Bridge Mono 1kHz Sine Wave
No Load
Type of Test Input Signal and Comments
or Adjustment Load Parameters
- SERVICE MANUAL 1
- Macro-Tech® 1
- Revision History 3
- Table of Contents 5
- 1 Introduction 7
- 1-2 Introduction 8
- 2 Specifications 9
- ±10 millivolts 10
- 2-4 Specifications 12
- 3 Voltage Conversion 13
- INSTRUCTIONS 13
- 3-2 Voltage Conversion 14
- 4 Circuit Theory 15
- 4-2 Circuit Theory 16
- 4.2.2 Output Stage Circuitry 17
- 4.3 VZ Power Supply 18
- 4.3.2 VZ Supply Circuitry 19
- 4.4 ODEP Theory 20
- On Main ModuleOff Main 21
- 4.5 Front End Theory 22
- 4.6 Protection Systems 23
- 4-10 Circuit Theory 24
- 4.6.2 Over-voltage 25
- 4.6.3 DC/LF 25
- 4.6.5 Output Thermal 26
- 4.6.6 Transformer Thermal 26
- 4.6.7 FET Thermal 26
- 4.7 Display 27
- 4.8 Mono Modes 27
- 4.8.2 Parallel Mono 28
- 5 Maintenance 29
- 5.3.2 LED Checks 30
- Maintenance 5-3 31
- 5.4 Test Procedures 32
- 5-6 Maintenance 34
- Maintenance 5-7 35
- Maintenance 5-9 37
- 5-10 Maintenance 38
- Figure 5.3 10-kHz Square Wave 38
- Maintenance 5-11 39
- ENABLECH2 40
- 5-14 Maintenance 42
- 6 Parts 43
- 6-2 Parts 44
- 7 Exploded View Parts 45
- 7-2 Exploded View Parts 46
- 7.1 Main Chassis Assembly 47
- 7-4 Exploded View Parts 48
- 7.2 Front Chassis Assembly 49
- 7-6 Exploded View Parts 50
- 7.3 Middle Chassis Assembly 51
- 7-8 Exploded View Parts 52
- 7.4 Rear Chassis Assembly 53
- 7-10 Exploded View Parts 54
- Exploded View Parts 7-11 55
- 7-12 Exploded View Parts 56
- 7.6 Transformer Assembly 57
- 7-14 Exploded View Parts 58
- Exploded View Parts 7-15 59
- 7-16 Exploded View Parts 60
- Exploded View Parts 7-17 61
- 7-18 Exploded View Parts 62
- Exploded View Parts 7-19 63
- 7-20 Exploded View Parts 64
- Exploded View Parts 7-21 65
- 7-22 Exploded View Parts 66
- Figure 7.12 Output Assembly 66
- 7.12 Output Assembly 67
- 7-24 Exploded View Parts 68
- Exploded View Parts 7-25 69
- 7-26 Exploded View Parts 70
- Interconnect Cables 71
- 7-28 Exploded View Parts 72
- 8 Module and Schematic 73
- Information 73
- 9 Module Parts 75
- 9-2 Module Parts 76
- Module Parts 9-3 77
- 9-4 Module Parts 78
- Module Parts 9-5 79
- 9-6 Module Parts 80
- Module Parts 9-7 81
- 9-8 Module Parts 82
- Module Parts 9-9 83
- 9-10 Module Parts 84
- Module Parts 9-11 85
- 9-12 Module Parts 86
- Module Parts 9-13 87
- 9-14 Module Parts 88
- Module Parts 9-15 89
- 9-16 Module Parts 90
- Module Parts 9-17 91
- 9-18 Module Parts 92
- Module Parts 9-19 93
- 9-20 Module Parts 94
- Module Parts 9-21 95
- 9-22 Module Parts 96
- Module Parts 9-23 97
- 9-24 Module Parts 98
- Module Parts 9-25 99
- MA-5002VZ Service Manual 100
- 9-26 Module Parts 100
- 130446-1 Rev. A 100
- Module Parts 9-27 101
- 9-28 Module Parts 102
- (Component Side) 103
- 125903-4 PWA Component Map 103
- 9-30 Module Parts 104
- Module Parts 9-31 105
- 9-32 Module Parts 106
- Module Parts 9-33 107
- 9-34 Module Parts 108
- Module Parts 9-35 109
- 9-36 Module Parts 110
- Module Parts 9-37 111
- 9-38 Module Parts 112
- 127488-2 PWA Component Map 113
- 9-40 Module Parts 114
- Module Parts 9-41 115
- 9-42 Module Parts 116
- Module Parts 9-43 117
- 9-44 Module Parts 118
- Module Parts 9-45 119
- 9-46 Module Parts 120
- Module Parts 9-47 121
- 9-48 Module Parts 122
- Q42929-2 PWA Component Map 123
- 9-50 Module Parts 124
- Q42934-2 Negative Emitter PWA 125
- 9-52 Module Parts 126
- Q42935-9 Positive Emitter PWA 127
- 9-54 Module Parts 128
- Module Parts 9-55 129
- 9-56 Module Parts 130
- Module Parts 9-57 131
- 9-58 Module Parts 132
- Module Parts 9-59 133
- 9-60 Module Parts 134
- Module Parts 9-61 135
- 9-62 Module Parts 136
- Module Parts 9-63 137
- 9-64 Module Parts 138
- 10 Schematics 139
- 10-2 Schematics 140
Commentaires sur ces manuels
Produits connexes et manuels pour Amplificateurs audio Crown Macro-Tech 5002VZ
(30 pages)
(18 pages)
(6 pages)© 2020, manymanuals.fr. Tous droits réservés | 0.044 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Luis pprca pasamelo