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Portastudio 246
Tascam Portastudio 246 User Manual
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2
Table of Contents
Table of Contents
2
Specifications and Service Data
2
Precautions
2
Circuit Description
4
Outline
4
Control Circuit
4
Block Diagram
5
Play Mode
6
REC Mode
6
Pause Mode
7
REW Mode
8
FF Mode
8
Power on Mute Circuit
9
Amplifier Circuit Control Signal
9
Record, Playback Circuit
10
Signal in the Decode Mode
11
Signal in the Encode Mode
11
Major Parts Location
12
Maintenance
13
Adjusting Tools and Equipment
13
Definition and Measurement Conditions
13
Disassembly of Major Parts
13
Check and Alignment of Tape Deck Section
14
Pinch Roller Pressure
15
Take-Up Torque
15
Tape Travel
16
Head Azimuth
16
Tape Speed
16
Signal Path and Response Check of Mixer Section
17
Setting of each Switch and Control
17
Wow and Flutter
17
PGM out Level and VU Meter
18
Peak LED of VU Meter
18
Insert Output Level
18
OL (over Load) Indicator
18
MIC/Line Input - PGM out
19
EQ Response (MIC/Line in - PGM Out)
19
MIC/Line Input - Effect out
19
MIC/Line Input - Monitor out
20
Frequency Response
20
Headphone Output
20
Pingpong Recording
20
Record/Playback Amplifier Checks and Adjustment
21
Playback Level
21
Playback Frequency Response
22
Bias Tuning (T611-641)
22
Bias Trap
22
Bias Voltage
22
Record Level
23
Overall Frequency Response
23
Overall Distortion
23
Overall SN Ratio
24
Erasing Ratio
24
Crosstalk between Channels
24
Dbx Amplifier
24
Function Generator Schematic
25
Exploded View and Parts List
27
PCB Boards and Parts List
34
Input AMP PCB Assy
35
Monitor PCB Assy (A)
35
Monitor PCB Assy (B)
35
Buss PCB Assy
36
Joint PCB Assy
36
Operation Switch PCB Assy
36
Control (A) PCB Assy
36
Meter (A) PCB Assy
37
Control (B) PCB Assy
37
Meter (B) PCB Assy
37
Drive PCB Assy
37
Power Supply PCB Assy
38
In/Out PCB Assy
38
VR PCB Assy
38
Phone Jack PCB Assy
38
LED PCB Assy
39
R/P PCB Assy
40
Monitor PCB Assy
45
OPE SW PCB Assy
46
Meter PCB Assy
48
P. Supply PCB Assy
49
PWR SW PCB Assy
50
Speed SW PCB Assy
50
Sensor PCB Assy
50
Block Diagram
53
Level Diagram
54
IC Internal Circuit
55
Schematic Diagram
57
Wiring Diagram
61
Schematic Diagram - In/Out Pcb/Input AMPL PCB/LED PCB/MIC Jack Pcb/Buss PCB Assys
63
Schematic Diagram - Joint Pcb/Control Pcb/Control Pcb/Operation Switch Pcb/Remote Pcb/Punch In/Out PCB Assy
67
Schematic Diagram - Rec/Play PCB Assy
69
Schematic Diagram - Power Switch Pcb/Power Supply PCB Assys
71
Schematic Diagram - LED Pcb/Phone Jack Pcb/In-Out Pcb/Meter Pcb/Monitor PCB Assys
73
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Tascam Portastudio 246 Specifications
General
Brand
Tascam
Model
Portastudio 246
Category
Recording Equipment
Language
English
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