Tascam 38 Manuals

Manuals and User Guides for Tascam 38. We have 1 Tascam 38 manual available for free PDF download: Operation And Maintenance

Tascam 38 Operation And Maintenance (100 pages)

8-Track Recorder/Reproducer

Brand: Tascam | Category: Tape Deck | Size: 6.42 MB

Table of Contents
3
Introduction to the 38 and Its Design Philosophy
4
Control Panel
5
Features and Controls
6
Entering "Record"
8
Threading the Tape
9
Sound and Music Reference
10
The Db; Who, What, Why
10
Impedance Matching and Line Levels
14
True Output Impedance
15
Minimum Load Impedance
15
Input Impedance
15
Finding Impedance Values on Other Brands of Equipment
15
Reference Levels
16
Daily Setup
17
Voltage Conversion
18
Note for U.K. Customers
18
Connection and Operation of the DX-4D
19
Hook up
19
DBX Bypass Switch
20
Original Recording
20
Overdubbing
20
How the DX-4D Works
20
Mixing
21
Subsonics and Interference
21
M-30 Recording Mixer
22
Features of the M-30
22
Specifications of the M-30
23
Accessory Information
24
Specifications of the 38
26
More Information Is Available
28
Maintanance
29
System Control IC
30
Theory of Operation
30
Logic Used in the Tape Deck
30
Pin Assignments and Their Functions
30
Block Diagram
31
Input Signals and Resulting Modes
31
Mode Transition
32
Operation with more than One Input Signal
32
Input/Output Levels
32
Initial Reset Circuit
33
System Control IC Input Circuit
33
Power Shut-Off Circuit
33
Capstan and Brake Solenoid Drive Circuit
34
Flashing & Steady State Voltage
34
Solenoid Drive Circuit
35
Reel Motor Drive Circuit
36
Reproduce (Record) Operation
36
Tape Direction Sensing and Counter Clock Generation Circuits
39
Counter Clock Pulse
40
Motion Sensing Circuit
40
F.F. and REW Mode Operation
42
Electrical Brake System
42
FF and REW Mode Operation Control Circuits
43
Counter Zero Return
44
Counter Zero Return Control Circuit
45
Punch In/Out Control Circuit
46
Edit Control Circuit
48
REC and PLAY Mute Signal
48
Rec & Play Mute Circuit
48
Display Circuit
49
Amplifier Circuit Description
50
Power Muting Circuit
50
Bias and Record Control Circuit
51
Record Circuit Switching Timing Diagram
52
Reproduce Amplifier Circuit
53
Amplifier Circuit Diagram
54
SYNC Relay Operation Timing Chart
55
Level Diagram
55
Checks and Adjustments
56
Essential Test Equipment Required
56
Removing the Panels of the Deck
57
Dress Panels
57
Rear Panel
57
Capstan Thrust Clearance
58
Brake Mechanism
58
Brake Torque
58
Reel Motor Torque
59
Take-Up Torque
59
Back Tension
59
Resistors for Tension Adjustment on Control PC Board
60
Pitch Roller Pressure
60
Reel Table Height Adjustment
61
Tape Speed
61
Wow and Flutter Check (Reproduce Method)
61
Record/Reproduce Amplifier Checks and Adjustments
62
Head Contact
62
Head Azimuth Adjustment
62
Tape Path Adjustment
62
Head Contact and Azimuth Adjust Screws
63
Phase Shift
63
Input Level Calibration
63
Meter Calibration
64
Reproduce Level Calibration
64
Reproduce Frequency Response
64
Bias Tuning and Bias Trap Adjustments
65
Recording Bias Adjustment
65
Bias Level Adjustment
65
Recording Level Adjustment
66
Frequency Response (Overall)
66
Signal-To-Noise Ratio (Overall)
66
Erase Ratio Test Set-Up
67
Crosstalk Measurement Set-Up
67
Adjacent Channel Crosstalk
67
Distortion Measurement Set-Up
67
Exploded View and Parts Lists
68
Assembling Hardware Coding List
80
PC Boards and Parts Lists
82
Mother PCB Assy
82
Control PCB Assy
84
Record/Reproduce AMPL, PCB Assy
86
Power Supply PCB Assy
86
Function Select PCB a Assy
88
Function Select PCB B Assy
88
Out Select PCB Assy
88
Master OSC PCB Assy
88
REC/REP Ampl.pcb Assy
91
Function Select a(B) PCB Assy
94
Punch In/Out PCB Assy
94
Fuse PCB Assy (PC Board Omitted)
94
Function LED PCB Assy
95
Out Select LED PCB Assy (PC Board Omitted)
95
Operation PCB Assy (PC Board Omitted)
95
Head PCB Assy (PC Board Omitted)
95
Schematics
96
Wiring Circuit Diagram
96
Head Assembly Circuit
98

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