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Manuals
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Tascam Manuals
Tape Deck
38
Operation and maintenance
Tascam 38 Operation And Maintenance
8-track recorder/reproducer
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Table Of Contents
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Contents
Table of Contents
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Table of Contents
Table of Contents
Introduction to the 38 and Its Design Philosophy
Control Panel
Features and Controls
Entering "Record"
Threading the Tape
Sound and Music Reference
The Db; Who, What, Why
Impedance Matching and Line Levels
True Output Impedance
Minimum Load Impedance
Input Impedance
Finding Impedance Values on Other Brands of Equipment
Reference Levels
Daily Setup
Voltage Conversion
Note for U.K. Customers
Connection and Operation of the DX-4D
Hook up
DBX Bypass Switch
Original Recording
Overdubbing
How the DX-4D Works
Mixing
Subsonics and Interference
M-30 Recording Mixer
Features of the M-30
Specifications of the M-30
Accessory Information
Specifications of the 38
More Information Is Available
Maintanance
System Control IC
Theory of Operation
Logic Used in the Tape Deck
Pin Assignments and Their Functions
Block Diagram
Input Signals and Resulting Modes
Mode Transition
Operation with more than One Input Signal
Input/Output Levels
Initial Reset Circuit
System Control IC Input Circuit
Power Shut-Off Circuit
Capstan and Brake Solenoid Drive Circuit
Flashing & Steady State Voltage
Solenoid Drive Circuit
Reel Motor Drive Circuit
Reproduce (Record) Operation
Tape Direction Sensing and Counter Clock Generation Circuits
Counter Clock Pulse
Motion Sensing Circuit
F.F. and REW Mode Operation
Electrical Brake System
FF and REW Mode Operation Control Circuits
Counter Zero Return
Counter Zero Return Control Circuit
Punch In/Out Control Circuit
Edit Control Circuit
REC and PLAY Mute Signal
Rec & Play Mute Circuit
Display Circuit
Amplifier Circuit Description
Power Muting Circuit
Bias and Record Control Circuit
Record Circuit Switching Timing Diagram
Reproduce Amplifier Circuit
Amplifier Circuit Diagram
SYNC Relay Operation Timing Chart
Level Diagram
Checks and Adjustments
Essential Test Equipment Required
Removing the Panels of the Deck
Dress Panels
Rear Panel
Capstan Thrust Clearance
Brake Mechanism
Brake Torque
Reel Motor Torque
Take-Up Torque
Back Tension
Resistors for Tension Adjustment on Control PC Board
Pitch Roller Pressure
Reel Table Height Adjustment
Tape Speed
Wow and Flutter Check (Reproduce Method)
Record/Reproduce Amplifier Checks and Adjustments
Head Contact
Head Azimuth Adjustment
Tape Path Adjustment
Head Contact and Azimuth Adjust Screws
Phase Shift
Input Level Calibration
Meter Calibration
Reproduce Level Calibration
Reproduce Frequency Response
Bias Tuning and Bias Trap Adjustments
Recording Bias Adjustment
Bias Level Adjustment
Recording Level Adjustment
Frequency Response (Overall)
Signal-To-Noise Ratio (Overall)
Erase Ratio Test Set-Up
Crosstalk Measurement Set-Up
Adjacent Channel Crosstalk
Distortion Measurement Set-Up
Exploded View and Parts Lists
Assembling Hardware Coding List
PC Boards and Parts Lists
Mother PCB Assy
Control PCB Assy
Record/Reproduce AMPL, PCB Assy
Power Supply PCB Assy
Function Select PCB a Assy
Function Select PCB B Assy
Out Select PCB Assy
Master OSC PCB Assy
REC/REP Ampl.pcb Assy
Function Select a(B) PCB Assy
Punch In/Out PCB Assy
Fuse PCB Assy (PC Board Omitted)
Function LED PCB Assy
Out Select LED PCB Assy (PC Board Omitted)
Operation PCB Assy (PC Board Omitted)
Head PCB Assy (PC Board Omitted)
Schematics
Wiring Circuit Diagram
Head Assembly Circuit
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Threading the Tape
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Maintanance
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