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Contents
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Input Buffers and Crossover Filters ..... ..... .. 2
Input Muting and Protection Circuits . . . .. . ..... 5
Power Amplifiers . . . .. . ..... . .. . . . . . .. .. . . . 6
Pulse Width Modulating Power Supply ...... . ..
Required Equipment . . ... . . . . ........ . . . . . . 11
Power Supply . ..... . . . ... .. . . . . ....... . .. 11
Bias Adjustment . . . . ... ..... .. . . .. .. . . . . . . 12
Frequency Response ........ . .. . . .. .. .. . ... 12
Low Pass Crossover . . ... . . . .. . .. . ... . . . . . . 12
High Pass Crossover .. ....... ... . .. . . ... . . . 12
Commutator Threshhold ... . ........ .. . . ... . 13
Power and Distortion . . . . . .... . ......... . .. 13
Protection Circuits ... ... ....... . ... . .. ... . 13
Noise . .. ...... . ... .. . . .... ... ........... 14
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Mechanical Installation of PCB . . .. . ... . .... . 14
Mechanical PCB Changes .. ... . . . . . . . . .. . .. 14
Phono Jacks . . . .... .... ..... . .. ....... .... 14
Pulse Width Modulating Supply .... . .. . .... .. 14
Replacement of 3524 Chip . .. . . . . ... .... .... 15
Mechanical Design of Level Controls . . . . .. . .. 15
Part Substitutions ........... . . .. ... ....... 15
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1.
M240 Block Diagram . . . . ...... .. .... . ...... 3
2.
M240 Schematic Diagram ...... . . . . ... ..... . 4
3.
Frequency Response Graph . ..... . . . . ..... ... 5
4.
Commutator Threshhold .. .. . .. .... ..... ..... 7
5.
@ 1 KHz ..... .. . .. . ... . . . . . .. . ........... 7
6.
@ lO KHz . ..... .. . . ..... .. . . . . .. .. ...... . 7
7.
3524 Block Diagrams . . . . . ..... . . .
8.
Maximum Duty Cycle . . . .. .. . . ..
Service Manual
M240 Mobile Magnetic Field Amplifier
Service Manual
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9.
Ramp and 3524 Output,
Minimum Duty Cycle
10.
Maximum Duty Cycle
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Switcher Driver Minimum Duty Cycle . . . . . . . . 10
11.
12. Differentiator Waveform . . ........... ... . . . 10
13. PCB Assembly Diagram, Sheet 1 .... . ... . ... 21
14 .
PCB Assembly Diagram, Sheet 2 ............ 22
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15. Final Assembly Diagram .
16. Assembly Instructions, Sheet 1 ..............
17. Assembly Instructions, Sheet 2 . .
18.
Assembly Instructions, Sheet 3
Introduction
This manual is designed to provide qualified
service personnel with all of the technical
infonnation needed to test and to repair
malfunctioning M240 Mobile Magnetic Field
Amplifiers.
The rationale behind the design of this manual is
that experienced service personnel are better served
by detailed technical infonnation, rather than by
step-by-step fault isolation procedures, which may
or may not apply in any given situation.
this manual describes the theoretical operation of
the unit, then lists a series of perf onnance
verification tests.
Further background infonnation is provided in the
form of service bulletins, parts lists, mechanical
assembly instructions, and supporting illustrations.
This manual is a companion document to the
8
Carver Car Amplifier M240
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9
Refer to the
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Owner's Manual.
Owner's Manual
for detailed
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As such,
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