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Tascam BR-20 Series Maintenance Manual

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Operating and maintenance instructions manual (33 pages)

Operation & maintenance manual (32 pages)

Table Of Contents

Table of Contents

Table of Contents
Parts Lists
Parts Location Illustrations
View with Top Rear/Bottom Panel Removed
Test Equipment
Voltage Conversion
Voltage Selector Location Diagram
Front Panel Removal
Control Panel Removal
Side Panels Removal
Top Rear/Connector/Lower Rear Panels Removal
Screw Locations for Side and Top Rear Panel Removal
Screw Locations for Connector and Lower Rear Panel Removal
Bottom Panel Removal
Fuse Replacement
Mechanical Checks and Adjustments
Brake Mechanism
Brake Band-Drum Clearance Adjustment Diagram
Brake Torque/Brake Check
Brake Torque Measurement/Adjustment
Pinch Roller Pressure Check/Adjustment
Capstan Shaft Tolerance Adjustment
Reel Table Height Adjustment
Rape Tension Servo
Tape Tension in Edit Mode Check/Adjustment
Tape Tension Adjustment Resistors View
Play Tape Tension Check/Adjustment
Fast Forward/Rewind Tape Tension Check/Adjustment
Tape Speed/"Fix" Tape Speed Check/Adjustment
"EXT" Speed Check/Adjustment
Fast Winding Speeds Check/Adjustment
Wow and Flutter
Tape Positioning Check and Fine Adjustment
Tension Roller Height Adjustment
Head Alignment
Head-Tape Contact
Erase Head/Record and Sync Repro Heads
Head Azimuth
Amplifier Checks and Adjustments
Nominal Input/Output Levels
Level Controls
Amp. Check/Adjustment
Reproduce Level
At High/Low Tape Speed
Bias Tuning and Bias Trap Adjustment
Reproduce Frequency Response
Bias Tuning (L4)
Bias Trap Adjustment (U9)
Record Bias
Record Level Check/Adjustment
Overall Frequency Response Check/Adjustment at High/Low Speed
Overall Distortion
Overall Signal-To-Noise Ratio
Erasure
Headphones Output Level
Crosstalk
Time Code Channel Adjustments (BR-20T Only)
Reproduce Level Set
Output Level/Bias Tuning (L4)/Bias Trap (U13)
Input Level/Record Bias/Record Level
Crosstalk Suppression
Crosstalk from Audio to Time Code Channels
Adjustment Procedure
Checks and Adjustments Chart
Optional Modifications
DIP-Switch Locations Diagram
Parts List
Mechanics - Exploded View-1
Mechanics - Exploded View-2
Mechanics - Exploded View-3
Mechanics - Exploded View-4
Mechanics - Exploded View-5
Electronics: Control PCB Ass'y View
Electronics: Mother PCB Ass'y View
Electronics: Operation Key PCB Ass'y View
Electronics: Operation CPU PCB Ass'y
Electronics: R/P AMPL PCB Ass'y View
Electronics: AMP CONT PCB Ass'y
IN/OUT AMPL PCB Ass'y View
Capstan Servo PCB Ass'y View
N Filter PCB Ass'y (J, US, C, GE)/(E, UK, A)
PS PCB Ass'y
VR PCB Ass'y View
Phone AMPL PCB Ass'y View
Speed SW PCB Ass'y View
Phone VR PCB Ass'y View
Joint PCB Ass'y View
Jack PCB Ass'y View
Sensor L/R PCB Ass'y/Pg PCB Ass'y/Transistor PCB Ass'y View/Speaker SW PCB Ass'y (BR-20N - 20T)
TC AMPL PCB Ass'y (-20T Only)
Coil A/B PCB
TC In/Out PCB Ass'y (-20T Only)
Control PCB Assy Parts List
Mother PCB Assy Parts List
Operator Key PCB Assy Parts List
R/P AMPL PCB Assy Parts List
Operator CPU PCB Assy Parts List
AMP CONT PCB Assy Parts List
In/Out AMPL PCB Assy Parts List
Capstan Servo PCB Assy Parts List
N Filter PCB Assy Parts List
PS/VR PCB Assy Parts List
Phone AMPL PCB Assy Parts List
Speed SW PCB Assy/Phone VR PCB Assy/Jack PCB Assy/Joint PCB Assy Parts List
Sensor L/R PCB Assy Parts List
PG PCB Assy Parts List
Transistor PCB Assy Parts List
TC AMPL PCB Assy (-20T Only) Parts List
Speaker SW PCB Assy (BR-20N (US, C, J), -20T (J)) Parts List
TC IN/OUT PCB Assy (-20T Only)
Schematic Drawings
Wiring Diagram
Mother PCB Assy Schematic Drawing
R/P AMPL PCB Assy Schematic Drawing
Control PCB Ass'y Schematic Drawing
Operation CPU PCB Assy, Operation Key PCB Assy, Speed SW PCB Assy Schematic Drawing
PS PCB Assy Schematic Drawing
AMP CONT PCB Assy Schematic Drawing
TC AMPL PCB Assy (-20T Only) Schematic Drawing
Capstan Servo PCB Assy Schematic Drawing
Mechanism Section PCB Assy Schematic Drawing
VR PCB Assy Schematic Drawing
In/Out AMPL PCB Assy Schematic Drawing
Phone AMPL PCB Assy, Phone VR PCB Assy Schematic Drawing
IC Internal Block Diagrams
CMOS MPU/CMOS Programmable Peripheral Interface/32768-Word B-Bit UV Erasable and Programmable ROM Schematic Drawings
Numeral Display/8-Bit Multiplying Ditigal-To-Analog Converter Schematic Drawings
Regulated Voltage Supply/Voltage Detect Alarm Circuit Schematic Drawing
Y-F/F-V Converter Schematic Drawing

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Tascam BR-20 Series Maintenance Manual

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