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Lowrey M375 Parade Service Manual

Organ

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Table Of Contents

Table of Contents

Table of Contents
Specifications
Upper Keyboard
Lower Keyboard
Upper Tabs
Orchestral Symphonizer Presets
Track II Rhythm
Bass
General Features
Dimensions
Circuit Description
Overview
Central Processing Unit
Summary of System Operation
Keyswitch Data Processing
Rhythm Data Processing
Lower Keyboard/Genie Keying
Component Functional Description
Orchestral Symphonizer Button
Data Processing
IC1 Microprocessor
Instruction Timing Cycle
Writing Data to Programmed Oscillator
IC11D, IC6 Inverter, Write Delay
Q1 Genie Keyer
Q2 Magic Swing Piano Keyer
Q9 Bass Keyer
Instrumentation
IC8A Pedal Divider
IC4A, IC4B Bass Filter, Preamp
IC1, IC2 Rhythm Generators
DC Control
Q2, Q3 Power on Reset Delay
Parallel/Serial Shift Registers
Serial to Parallel Decoders
Q28, Q27 Slow Attach Enable Switcher
Q24 Brass Enable Switcher
Q9 16 Disable Switcher
Q4, Q5 Vibrato Oscillator
Flute/String Keyers
Q18, Q17 Marimba Enable Switchers
IC7D, IC7C Repeat Oscillator
Orchestral Symphonizer Keyers
IC15, IC16 String Collector Amp
Brass Keying
Percussion/Slow Attach Keying
Slow Attach Keying
Percussion Keying
Upper Keyboard Quality Control
Lower Keyboard QC
FET Switches
Lower Keyboard Accent
Chorus Modulator
High Speed, Low Speed Oscillators, Mixer, Inverter
Power Supply
Amplifier
IC3, IC4 Bucket Brigades
Q1, Q2 Chorus Output Low-Pass Filters
P1 Photocell
Q1 Preamp
Q3 Driver
Q9 Phase Splitter
Adjustments
Vibrato Speed Adjustment
Master Oscillator Tuning Procedure
Bias Adjustment
Self Test Procedure
Simplified Block Diagram
Test Equipment
Oscilloscope Usage
Calibration
Time Base
Triggering
Determining Frequency
Internally Triggered Data
Externally Triggered Data
Block Diagram
Tab Panel Referenec
Important Information
Schematic Drawings, Printed Wiring Boards
Components
Transistor Basing Diagram
Frequency Distribution Chart
Rhythm Pattern Charts
Parts Information
Parts Ordering Procedure
Parts List

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1 Specifications
2 Upper Keyboard
3 General Features
4 Schematic Drawings, Printed Wiring Boards
5 Parts List
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Lowrey M375 Parade Service Manual

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