Polaris Service Manual
This section contains the entire Fender Chroma Service Manual complete with large format Schematics, PC Layouts and Drawings in PDF format.
The Computer Tutorial may be useful as an introduction to the state of the art in the mid-1980s. Circuit Descriptions provides an overview of the main board, control panels, power supply, and output board. Disassembly covers just that; Diagnostics and Adjustments and Checkout should be useful for those who are repairing their Polaris keyboard. Options deals with memory and EPROM upgrades; the Parts List "outlines most parts needed to service the Polaris."
Thanks to Steve Grom [21030502] for supplying a copy of the manual.
Contents
Section 1: System Overview
Section 2: Computer Tutorial
Section 3: Circuit Descriptions
- Main Board
- Computer
- Memory Array
- Changing Memory Chips
- Battery Backup Power Supply
- Data Out Buffer
- Panel Buffer
- Strobe Decoders, Miscellaneous I/O
- Footswitches
- Keyboard
- Motor Control
- Channel Control
- Chroma Interface
- MIDI Interface
- Timer Interface, Serial I/O
- Click Generator
- Analog to Digital Converter
- Digital to Analog Converter
- Sample and Hold Control
- Noise Generator
- Synthesizer Data Bus Buffer
- Synthesizer Voices
- Control Panels
- Power Supply
- Output Board
Section 4: Disassembly
Section 5: Diagnostics
- The "Scratch Patch"
- Channel Enable/Disable
- Oscillator Enable/Disable
- Diagnostic Readouts
- Hidden Functions Quick Reference
Section 6: Adjustments and Checkout
- Digital +5V Level
- Reference +5V Level
- CD OK threshold
- ADC Range
- DAC Null
- Lever Position
- Tuning
- Volume
- Lever Range
- Pedal Range
- Volume Offset
- Key Sensitivity
- Configuration Parameters
- What To Do If You Lose Your Memory
- General Operational Checkout
- Testing the Synthesizer Channels
- Checking for Proper Adjustments
- Testing the Interfaces
Section 7: Options
Section 8: Parts List
- Main Board
- Control Panel Left
- Control Panel Right
- Primary Board
- Secondary Board (Early Version)
- Secondary Board (Late Version)
- Output Board
- Keyboard
Section 9: Schematics, PC Layouts and Drawings
- Main Board Layout (Early Version)
- Main Board Layout (Late Version)
- Computer, Memory, Data & Panel Buffers, Battery Back-Up
- Interface, Timer, Keyboard & Channel Control, Misc.
- A/D, D/A, S & H H Control, Noise Generator
- Synthesizer Channel
- Control Panel Left Layout
- Control Panel Left Schematic
- Control Panel Right Layout
- Control Panel Right Schematic
- Keyboard Schematic
- Primary Board/Secondary Board Layout (Early Version)
- Power Supply Schematic (Early Version)
- Primary Board/Secondary Board Layout (Late Version
- Power Supply Schematic (Late Version)
- Output Board Layout
- Output Board Schematic
- Interconnection Diagram
- Left Membrane Switch Matrix
- Right Membrane Switch Matrix
- Parallel Interface Cable