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MX-GA77
JVC MX-GA77 User Manual
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1-41
MX-GA77
STK403-070 (FIC01) :
Po
wer amp.
2.Block diagram
1.Pin layout
14
Bias Circuit
Pre Driver IC
CH1
13
TR5
TR2
TR1
TR4
TR3
TR6
R6
R5
R8
R7
R3
R4
R1
C1
SUB
C2
R2
3
4
89
6
1
2
5
10
1
11
2
7
Pre Driver IC
CH2
4
1
+Vcc
12
ST
-BY
7
+TRE
8
SUB
9
GND
-Vcc
2
Ch1
out
3
Ch1
out
5
Ch2
out
10
Ch1
IN
11
Ch1
NF
13
Ch2
NF
14
Ch2
IN
6
Ch2
out
STK412-020 (WIC01) :
Po
wer amp.
1.Block diagram
1
3
13
10
12
14
TR1
TR3
TR5
TR7
TR17
TR8
TR9
TR19
TR18
TR20
TR10
TR4
TR2
TR12
TR6
TR16
D2
D12
D1
C2
C12
C1
R1
TR11
TR13
TR14
C11
R11
R4
R14
R5
R51
D51
D41
R41
Comaprator
Comaprator
SUB
TR41
D43
D42
D52
D53
R15
R6
R16
R7
R17
R2
TR15
TR51
R12
R3
R13
15
16
9
11
8
18
17
5
4
6
2
7
40
42
Table of Contents
Table of Contents
1
Area Suffix
1
Safety Precautions
2
Warning
2
Importance Administering Point on the Safety
3
Fuse Board (Forward Side)
3
Power Supply Board (Forward Side)
3
Preventing Static Electricity
4
Grounding to Prevent Damage by Static Electricity
4
Ground the Workbench
4
Ground Yourself
4
Removing the CD Tray Fitting
5
Removing the CD Changer Unit
5
Removing the Metal Cover
5
Disassembly Method
5
Removing the Front Panel Assembly
6
Removing the Heat Sink & Amp. Board
7
Removing the Tuner Board
7
Removing the Rear Panel
7
Removing the Main Board
8
Removing the Power Cord
8
Removing the Power Ics
8
Removing the Power Transformer
8
Removing the CD Switch Board
9
Removing the Front Board
9
Removing the Headphone Jack Board
9
Removing the Cassette Mechanism Assembly
9
Reinstall the CD Tray
10
Removing the CD Tray
10
CD Changer Unit
10
Removing the Sensor Board
11
Removing the Turn Tray Motor
11
Removing the Belt, the CD Board and the Switch Board
12
Removing the CD Mechanism Holder Assembly (Mechanism Included)
13
CD Mechanism Section
14
Removing the Pickup Unit
14
Removing the Motor Board
14
Removing the Feed Motor
14
Cassette Mechanism Section
15
Removing the R/P Head
15
Remove the Erase Head
15
Remove the Pinch Roller
15
Removing the Flywheel
16
Removing the Mechanism Board
16
Removing the Motor
16
Removing the Side Panel
17
Removing the Side Speaker
17
Speaker Section
17
Wiring Connection
18
Color Codes
18
Adjustment Method
19
Tuner
19
Adjustment Location of Tuner PCB
19
OSC Voltage
19
FM THD Adjustment
20
FM Search Level Adjustment
20
AM(MW) I.F Adjustment
20
IF CENTER and THD Adjustment
20
Adjust Deck 1 Play Level
21
Cassette Deck
21
To Adjust Plabyback Level/Rec
21
To Adjust Tape Speed
21
Adjust Deck 2 Play Level/Rec BIAS
22
Flow of Functional Operation until TOC Read
23
Cleaning the Pick up Lens
24
Life of the Laser Diode
24
Semi-Fixed Resistor on the APC PC Board
24
Maintenance of Laser Pickup
24
Replacement of Laser Pickup
24
Troubleshooting
25
Power Malfunction
25
No Output
25
Tuner Malfunction (FM/AM)
26
Tape
26
CD
27
Power on and CD Function
27
CD - MP3 Parts
28
LC876764 (UIC1) : Microcontroller
29
Pin Layout
29
Block Diagram
29
Description of Major Ics 1-29~42
29
Pin Function
30
KA9258D (IC301) : 4-Ch Motor Driver
31
KB9226 (IC101) : RF Amp. & Servo Signal Processor
32
5L9290 (IC201) : Digital Signal Processor for CDP
34
HA12237 (JIC01) : Audio Signal Processor
36
KS9274 (IC601) : CD-MP3 Decoder
37
TDA7442D (EIC01) : Audio Processor
38
L4959 (PIC02) : Voltage Regulator
39
M11L1644 (Ic602) : Dram
40
STK403-070 (FIC01) : Power Amp.
41
STK412-020 (WIC01) : Power Amp.
41
Pt8300 (Uic03, Uic04) : Dram
42
Compact Component System
45
Block Diagram
47
Standard Schematic Diagrams
48
Main Section
48
FL Display & System Control Section
50
CD Section
54
Printed Circuit Boards
58
Main Board
58
Front Board
60
Power Supply Board
65
Parts List
67
Exploded View of General Assembly and Parts List
68
CD Changer Mechanism
68
Parts List (General Assembly)
70
Speaker Box
72
CD Changer Mechanism Assembly and Parts List
73
Cassette Mechanism Assembly and Parts List
75
Electrical Parts List (Main Board)
77
Electrical Parts List (Front Board)
81
Electrical Parts List (Amp. Board)
83
Packing Materials and Accessories Parts List
88
Parts List (Packing)
89
Parts List (Accessories)
89
5
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JVC MX-GA77 Specifications
General
Brand
JVC
Model
MX-GA77
Category
Stereo System
Language
English
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