Crown Macro-Tech 5002VZ Manuel de service Page 41
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Maintenance 5-13
130446-1 Rev. A
MA-5002VZ Service Manual
©2000 Crown International, Inc.
Type of Test Input Signal and Comments
or Adjustment Load Parameters
Make sure the sensitivity switches are in the 26-dB
position and the level controls are fully clockwise. Ter-
minate the input with a 600-ohm load. Using a 20 Hz–
20 kHz bandpass filter, measure the noise on the out-
put of the channel under test. Noise should be less
than 574 µVrms (105 dB down from 1300 watts into 8
ohms).
Make sure the sensitivity switches are set in the
26-dB position. Load each channel to 8 ohms. Insert
a 20-kHz sine wave into channel 1 and adjust for 45
Vrms output. Terminate channel 2 input with 600 ohms.
Measure less than 80 mVrms at the output of channel
2. (Greater than 55 dB down at 20 kHz)
Move the input signal from channel 1 to channel 2
and the 600-ohm termination from channel 2 to chan-
nel 1. Ensure there is 45 Vrms at the output of chan-
nel 2. Measure less than 80 mVrms at the output of
channel 1.
Note: VZ-ODEP mode was checked during the ODEP
test, Step 23. I.M.D. and 1-kHz power checks ad-
equately tested the VZ (AUTO) mode. LOCK HIGH (if
present) was checked adequately in the static bal-
ance adjustment check, Step 12.
Place the VZ Mode
Switches in LOCK LOW (see Figure 5.4). With an
8-ohm load on each channel, insert a 1-kHz sine wave
into each channel. Clipping should occur at approxi-
mately 36 Vrms (410 W).
At the completion of testing, replace the 30 A fuses (if
testing was done at 100–120VAC), and set all switches
per customer request. If none are specified by the
customer, the following are standard factory settings
for original shipment:
Dual Mono Switch: STEREO position.
Sensitivity Switches: Both to 1.4V position.
Compressor Switches: Both to FAST position.
LOI Switches: Both to ON position.
VZ Mode Switches: Both to VZ–ODEP position.
Level Controls: Both down (counter-clockwise) fully.
In most applications, VZ–ODEP is the VZ Mode to use
for best thermal performance.
25. Noise No Signal
No Load
26. Crosstalk Check 20-kHz Sine Wave
8-ohm Load
27. VZ Modes 1-kHz Sine Wave
8-ohm Load
Post-testing Procedure:
- 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
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