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TA-RW255
Onkyo TA-RW255 User Manual
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HA12167FB/HA12169FB
29
Gain
g1
g2
g3
f1
f2
f3
f
BW
3dB
Figure 10 REC Equalizer Frequency Response
g1
=
9
R
6.67
RR
g2
9R
R
g3
9R
R
when Gain of EQ
-
VR is center
REF
GP
GH
GL
REF
GH
REF
×+
(
)
=
×
=
×
f1
=
1
2
6.67
10
R
–10
FM
π
××
×
f2
=
R
2
6.67
10
RR
GL
–10
FM
GH
π
××
×
×
f3
=
1
2
0.3
2.25
10
RR
–21
FQ
F/Q
π
⋅
××
×
BW
=
1
4
2.78
10
R
–10
F/Q
π
××
×
Q=
f3
BW
3.51
R
R
F/Q
FQ
=×
50
52
Table of Contents
Specifications
2
Exploded View
3
Cassette Mecha. Parts List
5
Schematic Diagram
6
Power Supply Pc Board
9
Schematic Diagram
9
Pc Board Connection Diagram
12
Printed Circuit Board Views-1
13
Main P.C.board
15
Display Circuit Pc Board (Nadis-8556)
17
Power Supply Pc Board (Naps-8557)
18
Input Volume Pc Board (Naetc-8558)
19
Power Switch Pc Board (Nasw-8559)
19
IC Block Diagram/ Terminal Description
22
Audio Signal Processor for Cassette Deck (Deck 1 Chip)
23
Description
23
Functions
23
Features
23
Ordering Information
24
Pin Description
25
Block Diagram
30
Absolute Maximum Ratings
31
Test Circuit
36
Mode Controller
37
Level Diagram
38
REC Mode (1 Khz NR-OFF)
38
PB Mode (1 Khz NR-OFF)
39
Application Note
40
Power Supply Range
40
Reference Voltage
40
Supply Voltage
40
Operating Mode Control
41
Threshold Voltage (VTH)
41
Serial Data Formatting
42
Attention Point of Serial Interface
42
Input Level
42
Serial Data Timming Chart Figure
42
Bias DAC Output Circuit
43
Input Volume Register
45
Equalizer Volume Register
45
Bias DAC Register
45
MPX ON/OFF Switch
46
Application as for the Dubbing Cassette Deck
46
MPX ON/OFF Switch Block Diagram
46
Injector Current
47
Gain Control of Electronic Volume
47
Application for Dubbing Deck
47
The Tolerances of External Components for Dolby NR-Block
48
Injector Current Application
48
Tolerances of External Components
48
Bias Dac
49
Level Meter
49
The Application of Equalizer Frequency Response
50
Transfer Function
50
REC Equalizer Block Diagram
50
REC Equalizer Frequency Response
51
Equalizer Characteristics Control Using a Bias DAC
52
Bias DAC Control of the GP Parameter
52
Equalizer Gain Vs. Frequency
53
Equalizer Peak Gain Vs. DAC Step Characteristics
54
Package Dimensions
95
Cautions
96
Microprocessor Block Diagram/ Terminal Description
98
Adjustment Procedure
101
Pc Board Layout
101
Packing View
102
Front Side
102
Exploded View Parts List
103
4
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Onkyo TA-RW255 Specifications
General
Brand
Onkyo
Model
TA-RW255
Category
Cassette Player
Language
English
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