Crown Audio 1200 service manual Voltage Conversion

Page 7

Micro-Tech 1200 Amplifier Service Manual

Voltage Conversion

The 120 Volt 60 Hz version, sold in the United States, is not voltage selectable. It does not have voltage selection boards. This version is to be used only with 120 Volts and only with 60Hz.

All other versions of the Micro Tech 1200 use voltage selection boards. The following chart indicates which jumpers are used for different voltages. Note that the fuses and transmotor may need to be changed to accommodate different voltages. Versions with the voltage selection boards may be used at 50 or 60 Hz.

 

 

VOLTAGE SELECTION BOARD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

100V

120V

200V

 

220V/230V

 

240V

 

 

 

 

 

 

 

 

 

 

 

 

 

Z101

Z100

Z101

 

Z101

 

Z100

 

 

 

Z104

Z104

 

 

 

 

Jumpers

Z106

Z105

Z103

 

Z102

 

Z102

 

 

Z201

Z200

Z201

 

Z201

 

Z200

 

 

 

Z204

Z204

Z203

 

Z202

 

Z202

 

 

 

Z206

Z205

 

 

 

 

 

 

 

Fuses

A10285-28, 20A

 

A10285-26, 10A

 

 

 

F100/F200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Transmotor

H43068-8

H43407-8

 

 

H43061-3

 

 

 

TF1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Contents MICRO-TECH-1200 Avis Table of Contents Introduction WarrantyScope Parts Information Power SpecificationsVoltage Conversion Front END Operation FeaturesTheory OverviewVoltage Translators Voltage AmplificationGrounded Bridge Topology Last Voltage Amplifiers LVAsLow Side LS High Side HSOutput Device Emulation Protection Odep Positive Standard Initial Conditions Electrical Checkout ProceduresTest 2 Output Bias Adjustment Test 3 Odep Voltage AdjustmentTest 12 Output Power Test 4 AC Power DrawTest 5 Common Mode Rejection Test 7 Phase ResponseTest 15 LF Protection Test 16 Signal to Noise RatioTest 13 Reactive Loads Test 14 Odep LimitingSpec at 0 dB Output 0.01% Spec at -35 dB Output 0.05% Post TestingTest 19 Intermodulation Distortion Test 20 ClippingSupplimental Items Parts List Non-ModulePower Supply Output Assembly ONE PER ChannelMain Chassis Assembly Output AssemblyBack Panel Assembly Chassis Front AssemblyParts List Non-Module Module and Schematic Information Fuse and Display Module Parts Lists Q42549-8 Output Module P10115-7 board Parts List Q42647-0 Output Module P10137-1 board Parts List Q42717-1 Output Module P10233-8 board Parts List Q42871-6 Output Module P10305-4 board Parts List Q42968-0 Output Module P10341-9 board Parts List Q43202-3 Output Module P10397-1 board Parts List Resistor Networks Q42552A0 Main Module D6304A4/D6304B2 board Parts ListMounts U1, U2 SwitchesConnectors Integrated CircuitsQ42714-8 Main Module D 6910-0 board Parts List Dpdt Open Q42776-7 Main Module D 7251-8 board Parts ListQ42776-7 Main Module D 7251-1 board Parts List HDR, 5 PIN Q42980-5 Main Module D7911-7 board Parts List Resistors DP3T NPN MPS8097 Q43035-7 Main Module D7993-5 board Parts ListJumper IC’S Q43031-6 Main Module D7993-5 board Parts List Resistor Networks Switches