Crown Macro-Tech 5002VZ Manuel de service Page 19
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Noté. / 5. Basé sur avis des utilisateurs
Circuit Theory 4-5
130446-1 Rev. A
MA-5002VZ Service Manual
©2000 Crown International, Inc.
Figure 4.3 Simplified VZ Supply in Operation
+
–
+Vcc (Positive Rail)
-Vcc (Negative Rail)
Load
(speaker)
Input
signal
HIGH SIDE LOW SIDE
Inverting Op-amp
R
V
1
S1
R
V
2
(+V
cc
)
(-V
cc
)
Parallel
=
Series =
R = Switch Resistance
+
––
+
VZ Power Supply Grounded Bridge Output Topology&
ite switch) are turned on. No current will flow through
either of the control diodes (D810 and D811, as shown
for channel 1) because reverse polarity is applied
through the MOSFET switch. Since this happens to both
rectifier sources at the same time, and the negative side
of Bridge 1 is then shorted to the positive side of Bridge
2, the supplies are forced to operate in series mode.
Like two batteries, the supplies will provide double volt-
age in series mode, double current in parallel mode.
Although shipped from the factory in VZ-ODEP mode,
the user may switch modes to Lock Low voltage (high
current), or operate the supply in VZ-AUTO mode. VZ-
ODEP is similar to VZ-AUTO mode, except that in AUTO
mode, in the event ODEP is activated to protect the
amplifier, the VZ will automatically lock into low voltage
(high current) mode. While this mode of operation will
cool the amplifier more quickly in the event that the ther-
mal reserve is exhausted, it may cause voltage clip-
ping rather than ODEP limiting. Seldom will the ampli-
fier be operated locked in high current mode unless a
very low impedance is being driven.
4.3.2 VZ Supply Circuitry
For simplicity, only channel 1 circuitry will be covered
unless noted otherwise. The actual VZ switch circuit is
located on the VZ switch assembly. This assembly con-
tains the filter capacitors, MOSFET switches, and con-
trol diodes (D810 and D811). Three MOSFETs are used
in parallel for sharing the high current supplied to the
rails. Operation of this section was covered in detail,
minus circuit designations, in Section 4.3.1.
WARNING: From a service standpoint, it is critical
to note that VZ switch control circuitry is NOT ground
referenced. Any attempt to take voltage measure-
ments using a ground reference when voltage is
applied will not only be unreliable, but may be ex-
tremely dangerous. Serious damage to equipment
or personnel may occur if this is attempted.
The output of a 555 timer (U703) on the control module
determines whether the MOSFETs are switched on
(high) or off (low). This 555 device and the various
sources that feed the 555 are the things that make the
articulation work.
The master 555 trigger is controlled by the output of
- 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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