Tascam BR-20 Series - Maintenance Manual

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Table of Contents3
Parts Lists4
Parts Location Illustrations5
View with Top Rear/Bottom Panel Removed6
Test Equipment7
Voltage Conversion7
Voltage Selector Location Diagram7
Front Panel Removal8
Control Panel Removal8
Side Panels Removal9
Top Rear/Connector/Lower Rear Panels Removal9
Screw Locations for Side and Top Rear Panel Removal9
Screw Locations for Connector and Lower Rear Panel Removal9
Bottom Panel Removal10
Fuse Replacement10
Mechanical Checks and Adjustments11
Brake Mechanism11
Brake Band-Drum Clearance Adjustment Diagram11
Brake Torque/Brake Check11
Brake Torque Measurement/Adjustment12
Pinch Roller Pressure Check/Adjustment12
Capstan Shaft Tolerance Adjustment12
Reel Table Height Adjustment13
Rape Tension Servo13
Tape Tension in Edit Mode Check/Adjustment13
Tape Tension Adjustment Resistors View13
Play Tape Tension Check/Adjustment14
Fast Forward/Rewind Tape Tension Check/Adjustment14
Tape Speed/"Fix" Tape Speed Check/Adjustment14
"EXT" Speed Check/Adjustment14
Fast Winding Speeds Check/Adjustment15
Wow and Flutter15
Tape Positioning Check and Fine Adjustment15
Tension Roller Height Adjustment16
Head Alignment16
Head-Tape Contact16
Erase Head/Record and Sync Repro Heads16
Head Azimuth17
Amplifier Checks and Adjustments18
Nominal Input/Output Levels19
Level Controls19
Amp. Check/Adjustment19
Reproduce Level19
At High/Low Tape Speed20
Bias Tuning and Bias Trap Adjustment20
Reproduce Frequency Response20
Bias Tuning (L4)21
Bias Trap Adjustment (U9)21
Record Bias21
Record Level Check/Adjustment22
Overall Frequency Response Check/Adjustment at High/Low Speed22
Overall Distortion23
Overall Signal-To-Noise Ratio23
Erasure24
Headphones Output Level24
Crosstalk24
Time Code Channel Adjustments (BR-20T Only)25
Reproduce Level Set26
Output Level/Bias Tuning (L4)/Bias Trap (U13)26
Input Level/Record Bias/Record Level26
Crosstalk Suppression26
Crosstalk from Audio to Time Code Channels27
Adjustment Procedure27
Checks and Adjustments Chart28
Optional Modifications30
DIP-Switch Locations Diagram30
Parts List31
Mechanics - Exploded View-131
Mechanics - Exploded View-233
Mechanics - Exploded View-335
Mechanics - Exploded View-437
Mechanics - Exploded View-539
Electronics: Control PCB Ass'y View42
Electronics: Mother PCB Ass'y View43
Electronics: Operation Key PCB Ass'y View44
Electronics: Operation CPU PCB Ass'y45
Electronics: R/P AMPL PCB Ass'y View46
Electronics: AMP CONT PCB Ass'y47
IN/OUT AMPL PCB Ass'y View48
Capstan Servo PCB Ass'y View49
N Filter PCB Ass'y (J, US, C, GE)/(E, UK, A)49
PS PCB Ass'y50
VR PCB Ass'y View51
Phone AMPL PCB Ass'y View51
Speed SW PCB Ass'y View51
Phone VR PCB Ass'y View52
Joint PCB Ass'y View52
Jack PCB Ass'y View52
Sensor L/R PCB Ass'y/Pg PCB Ass'y/Transistor PCB Ass'y View/Speaker SW PCB Ass'y (BR-20N - 20T)52
TC AMPL PCB Ass'y (-20T Only)53
Coil A/B PCB53
TC In/Out PCB Ass'y (-20T Only)53
Control PCB Assy Parts List54
Mother PCB Assy Parts List54
Operator Key PCB Assy Parts List55
R/P AMPL PCB Assy Parts List55
Operator CPU PCB Assy Parts List55
AMP CONT PCB Assy Parts List56
In/Out AMPL PCB Assy Parts List56
Capstan Servo PCB Assy Parts List56
N Filter PCB Assy Parts List56
PS/VR PCB Assy Parts List57
Phone AMPL PCB Assy Parts List57
Speed SW PCB Assy/Phone VR PCB Assy/Jack PCB Assy/Joint PCB Assy Parts List58
Sensor L/R PCB Assy Parts List58
PG PCB Assy Parts List58
Transistor PCB Assy Parts List58
TC AMPL PCB Assy (-20T Only) Parts List59
Speaker SW PCB Assy (BR-20N (US, C, J), -20T (J)) Parts List59
TC IN/OUT PCB Assy (-20T Only)59
Schematic Drawings60
Wiring Diagram60
Mother PCB Assy Schematic Drawing61
R/P AMPL PCB Assy Schematic Drawing62
Control PCB Ass'y Schematic Drawing64
Operation CPU PCB Assy, Operation Key PCB Assy, Speed SW PCB Assy Schematic Drawing65
PS PCB Assy Schematic Drawing66
AMP CONT PCB Assy Schematic Drawing67
TC AMPL PCB Assy (-20T Only) Schematic Drawing68
Capstan Servo PCB Assy Schematic Drawing69
Mechanism Section PCB Assy Schematic Drawing70
VR PCB Assy Schematic Drawing71
In/Out AMPL PCB Assy Schematic Drawing72
Phone AMPL PCB Assy, Phone VR PCB Assy Schematic Drawing73
IC Internal Block Diagrams74
CMOS MPU/CMOS Programmable Peripheral Interface/32768-Word B-Bit UV Erasable and Programmable ROM Schematic Drawings75
Numeral Display/8-Bit Multiplying Ditigal-To-Analog Converter Schematic Drawings75
Regulated Voltage Supply/Voltage Detect Alarm Circuit Schematic Drawing75
Y-F/F-V Converter Schematic Drawing75

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