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MX-GA77
SERVICE MANUAL
COMPACT COMPONENT SYSTEM
MX-GA77
Area suffix
B ------------------------ U.K. E ---- Continental Europe EN ----- Northern Europe EV ------- Eastern Europe
CD 1
STANDBY
CD 2
CD 3 DISC CHANGE
ECO
COMPACT
COMPONENT
SYSTEM
MX-GA77
REC START / STOP
R O C K
D A N C E
REPEAT
CD REC START
P O P
H A L L
PROGRAM
DUBBING
CLASSIC
STADIUM
RANDOM
DISPLAY
VOLUME
CLOCK / TIMER
PHONES
UND MODE SO
PRESET
SET
MP3
CANCEL / DEMO
SOUND TURBO
TAPE A / B
DISPLAY MODE RDS MODE
SELECT
SUBWOOFER LEVEL
TUNING TUNING
BEEP
EJECT
EJECT
SP-MXGA77
CA-MXGA77
SP-MXGA77
Contents
Safety Precautions Important for laser produbts Preventing static electricity Disassembly method Wiring connection Adjustment method 1-2 1-4 1-5 1-6 1-19 1-20 Flow of functional operation until TOC read Maintenance of laser pickup Replacement of laser pickup Trouble shooting Description of major ICs 1-24 1-25 1-25 1-26 1-30~44
COPYRIGHT
2003 VICTOR COMPANY OF JAPAN, LTD.
No.22083 Jul. 2003
MX-GA77
1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Services should be performed by qualified personnel only. 2. Alterations of the design or circuitry of the product should not be made. Any design alterations of the product should not be made. Any design alterations or additions will void the manufacturer`s warranty and will further relieve the manufacture of responsibility for personal injury or property damage resulting therefrom. 3. Many electrical and mechanical parts in the products have special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the Parts List of Service Manual. Electrical components having such features are identified by shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a substitute replacement which does not have the same safety characteristics as the recommended replacement parts shown in the Parts List of Service Manual may create shock, fire, or other hazards. 4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling. 5. Leakage currnet check (Electrical shock hazard testing) After re-assembling the product, always perform an isolation check on the exposed metal parts of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock. Do not use a line isolation transformer during this check. Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure the leakage current from each exposed metal parts of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground. Any leakage current must not exceed 0.5mA AC (r.m.s.). Alternate check method Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by a 0.15 F AC-type capacitor between an exposed metal part and a known good earth ground. AC VOLTMETER Measure the AC voltage across the resistor with the AC (Having 1000 ohms/volts, voltmeter. or more sensitivity) Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to 0.15 F AC TYPE the chassis, and meausre the AC voltage across the resistor. Place this Now, reverse the plug in the AC outlet and repeat each probe on measurement. Voltage measured any must not exceed 0.75 V each exposed AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 1500 10W metal part.
Good earth ground
1. This equipment has been designed and manufactured to meet international safety standards. 2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. 3. Repairs must be made in accordance with the relevant safety standards. 4. It is essential that safety critical components are replaced by approved parts. 5. If mains voltage selector is provided, check setting for local voltage.
! Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.
In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " " mark nearby are critical for safety. (This regulation does not correspond to J and C version.)
1-2
MA-GA77
(U.K only)
1. This design of this product contains special hardware and many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. 2. Any unauthorised design alterations or additions will void the manufacturer's guarantee ; furthermore the manufacturer cannot accept responsibility for personal injury or property damage resulting therefrom. 3. Essential safety critical components are identified by ( ) on the Parts List and by shading on the schematics, and must never be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts shown in the Parts List of the Service Manual and may create shock, fire, or other hazards. 4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the like to be separated from live parts, high temperature parts, moving parts and/or sharp edges for the prevention of electric shock and fire hazard. When service is required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to normal, after re-assembling.
1. Service should be performed by qualified personnel only. 2. This equipment has been designed and manufactured to meet international safety standards. 3. It is the legal responsibility of the repairer to ensure that these safety standards are maintained. 4. Repairs must be made in accordance with the relevant safety standards. 5. It is essential that safety critical components are replaced by approved parts. 6. If mains voltage selector is provided, check setting for local voltage.
!
Burrs formed during molding may be left over on some parts of the chassis. Therefore, pay attention to such burrs in the case of preforming repair of this system.
1-3
MX-GA77
Important for laser products
1.CLASS 1 LASER PRODUCT 2.DANGER : Invisible laser radiation when open and inter lock failed or defeated. Avoid direct exposure to beam. 3.CAUTION : There are no serviceable parts inside the Laser Unit. Do not disassemble the Laser Unit. Replace the complete Laser Unit if it malfunctions. 4.CAUTION : The compact disc player uses invisible laserradiation and is equipped with safety switches whichprevent emission of radiation when the drawer is open and the safety interlocks have failed or are de feated. It is dangerous to defeat the safety switches. 5.CAUTION : If safety switches malfunction, the laser is able to function. 6.CAUTION : Use of controls, adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.
! CAUTION Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
REPRODUCTION AND POSITION OF LABELS
CLASS 1 LASER PRODUCT
WARNING LABEL
1-4
MA-GA77
Preventing static electricity
1. Grounding to prevent damage by static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
2. About the earth processing for the destruction prevention by static electricity
In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of the work environment. Be careful to use proper grounding in the area where repairs are being performed.
2-1 Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the traverse unit (optical pickup) on it.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption) Anti-static wrist strap Conductive material (conductive sheet) or iron plate
3. Handling the optical pickup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.) 2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily destroy the laser diode.
4. Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit. 2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a time when attaching it to the connector. 3. Handle the flexible cable carefully as it may break when subjected to strong force. 4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
Attention when CD mechanism assembly is decomposed
*Please refer to "Disassembly method" in the text for pick-up and how to detach the CD mechanism assembly. 1. Remove the CD changer unit. 2. Remove the CD changer mechanism. 3. Solder is put up before the card wire is removed from the pickup unit connector on the CD mechanism assembly. (When the card wire is removed without putting up solder, the CD pick-up assembly might destroy.) 4. Please remove solder after connecting the card wire with the pickup unit connector when you install picking up in the substrate.
Card wire Picup unit connector
CD changer unit
CD changer mechanism
Fig.1
Card wire
Soldering Fig.2
Picup unit connector
1-5
MX-GA77
Disassembly method
Removing the metal cover (See Fig.1)
1. Remove the three screws A attaching the metal cover on the back of the body. 2. Remove the six screws B attaching the metal cover on both sides of the body. 3. Remove the metal cover from the body by lifting the rear part of the cover.
Metal cover
A
(both sides)
B
ONE POINT How to eject the CD tray manually (see fig.2) Turn the loading pulley gear at the bottom of the CD changer unit as shown in Fig.2 and draw the CD tray toward the front.
Fig.1
Loading pulley gear (See fig.1)
Removing the CD tray fitting (See Fig. 3)
Prior to performing the following procedure, eject the CD tray. Fig.2 1. After drawing the lower part of the tray fitting toward the front, remove the five claws. Then, while moving the tray fitting upward, remove it.
CD tray fitting Joint
Removing the CD changer unit (See Fig.4 to 7)
Prior to performing the following procedure, remove the metal cover and CD tray fitting. 1. Remove the card wire attached to CD changer unit on the adhesion tape. 2. Disconnect the card wire from the connector CW105 on the CD board. 3. Disconnect the harness from the connector CW104 on the main board.
CD changer unit Claw
Fig.3
Card wire
4. Remove the two screws C attaching the CD changer unit to the rear panel. 5. Remove the two screws D attaching the CD changer unit to both sides of the front panel assembly. 6. Draw the CD changer unit upward from behind while pulling the rear panel outward. 1-6
Adhesion tape
Fig.4
MA-GA77
CW105
CD board
C
Rear panel
CD changer unit CW104
Fig.6
Front panel assembly
CD changer unit
(both sides) Main board
D
Fig.5
Rear panel
Fig.7
Front panel assembly Main board CW101 CW109 CW110 CW108
Removing the front panel assembly (See Fig.8 to 10)
Prior to performing the following procedure, remove the metal cover and CD changer unit. 1. Disconnect the card wire from the connector CW101 on the main board. 2. Disconnect the harness from the connector CW108, CW109 and CW110 on the main board. 3. Remove the screw E fixiing the lug wire. 4. Remove the two screws F attaching the front panel assembly to both sides of the body. 5. Remove the screw G attaching the main board to the front panel assembly. 6. Remove the screw H attaching the front panel assembly to bottom of the body. 7. Release the two joints1 and two joints2, and detach the front panel assembly toward the front.
Joint1 (both sides)
ACW1 ACW2
Amp. board
F
E(fixing the lug wire)
Fig.8
Front panel assembly
(both sides)
Main board
G
Joint1 (both sides)
Fig.9
F
(both sides)
1-7
MX-GA77 Removing the heat sink & amp. board (See Fig.8, 11 and 12)
Prior to performing the following procedure, remove the metal cover and CD changer unit. 1. Disconnect the card wire from the connector ACW1 and the harness from the connector ACW2 on the amp. board. 2. Remove the four screws I attaching the heat sink cover to the rear panel. Remove the heat sink cover. 3. Remove the four screws J attaching the heat sink and two screws K attaching the speaker terminal to the rear panel. 4. After moving the heat sink upward, remove the claws. Then pull out the heat sink & amp. board inward.
Heat sink cover Joint2 (Bottom side)
H
Fig.10
Rear panel
I
I
Removing the tuner board (See Fig.12 and 13)
Prior to performing the following procedure, remove the metal cover. 1. Disconnect the card wire from the connector CON01 on the tuner board. Fig.11
Rear panel
J L K
Speaker terminal
Claws 2. Remove the two screws L attaching the tuner board to the rear panel. Heat sink
J
Removing the rear panel (See Fig.12)
Prior to performing the following procedure, remove the metal cover, CD changer unit, heat sink & amp. board and tuner board. 1. Remove the three screws M and three screws N attaching the rear panel.
M
N
Fig.12
CON01 Main board Rear panel
Tuner board
Fig.13 1-8
MA-GA77
Removing the main board
(See Fig. 14)
CW101 CW109 CW110 CW108 Main board Heat sink Fuse board PW103
Prior to performing the following procedure, remove the metal cover, CD changer unit and rear panel. 1. Disconnect the card wire from the connector CW101, and the harness from the connector CW108, CW109, CW110 and CW11, and the power cord from the connector PW103 on the main board. 2. Disconnect the harness from the connector PCW1 on the fuse board. 3. Remove the screw G attaching the main board to the front panel assembly. (See Fig.9) 4. Remove the two screws O attaching the heat sink to the bottom chassis.
PW102 Bottom chassis Power supply board
PCW1
CW11
O
Power cord Power cord stopper
Fig.14
Removing the power cord
(See Fig. 14)
Power ICs solder point Heat sink
Prior to performing the following procedure, remove the metal cover, CD changer unit and rear panel. 1. Disconnect the power cord from the connector PW103 on the main board and pull up the power cord stopper upward.
Amp. board (reverse side)
Removing the power ICs (See Fig.15 and 16)
Prior to performing the following procedure, remove the metal cover, CD changer unit and heat sink & amp. board. 1. Unsolder the power ICs solder points. 2. Remove the four screws P attaching the power ICs to the heat sink.
Fig.15
P
Heat sink
Amp. board
Removing the power transformer (See Fig .17)
Prior to performing the following procedure, remove the metal cover, CD changer unit and heat sink & amp. board. 1. Disconnect the harness from the connector PW102 on the power supply board. 2. Disconnect the harness from the connector PCW1 on the fuse board. 3. Remove the four screws Q attaching the power transformer on the bottom chassis.
Fig.16
Power transformer
Fuse board
PCW1
Q
Bottom chassis
Power supply board
PW102
Fig.17
1-9
MX-GA77
Prior to performing the following procedure, remove the front panel assembly.
Front panel assembly (inner side) CD switch board
A B
Removing the CD switch board (See Fig.1)
1. Disconnect the card wire from the connector UCW03 on the CD switch board. 2. Remove the five screws A attaching the CD switch board.
UCW03 Front board
UCW02
Removing the front board (See Fig.1 and 2)
1. Pull out the sound mode knob, volume knob, and preset knob from the front side of front panel assembly. 2. Disconnect the card wire from the connector UCW02 on the front board and the connector on the mecha. board. 3. Remove the fifteen screws B attaching the front board. 4. Disconnect the card wire from the connector UCW01 on the front board.
B
Connector Mecha. board
UCW01
Fig.1
Sound mode knob Volume knob Preset knob
Removing the headphone jack board (See Fig.3)
Prior to performing the following procedure remove the front board. 1. You can pull out the headphone jack board. Fig.2
Front panel assembly (inner side)
Removing the cassette mechanism assembly (See Fig.3)
1. Disconnect the card wire from the connector on the mecha. board. 2. Remove the six screws C attaching the cassette mechanism assembly.
Connector Headphone jack board
C
Mecha. board
C
C
1-10
(fixing the lug wire)
Cassette mechanism assembly
Fig.3
MA-GA77
Prior to performing the following procedure, remove the CD changer unit.
CD changer uint (reverse side) CD tray
Removing the CD tray
(See Fig.1 and 2)
Loading pulley gear
CD board
1. Turn the black loading pulley gear on the under side of the CD changer unit in the direction of the arrow and draw the CD tray toward the front until it stops. 2. Disconnect the card wire from connector CW103 on the CD board. 3. Push down the two tray stoppers marked a and pull out the CD tray.
CW103
Fig.1
a (Tray stopper)
Reinstall the CD tray
(See Fig.3 and 4)
CD tray
1. Align the gear-cam with the gear-tray as shown fig.3, then mount the CD tray. 2. When assembling the CD tray, take extreme care not engage with gear - synchro.
a (Tray stopper) CW103 (on the CD board)
Fig.2
Gear-cam
Gear-tray
Gear-convert
Gear-cam timing point Gear-tray
Gear-synchro
CD tray Gear-convert Gear-tray
Fig.3
Fig.4 1-11
MX-GA77 Removing the sensor board (See Fig.5)
CD tray (reverse side)
Prior to performing the following procedure, remove the CD tray. 1. Remove the screw A attaching the sensor board on the CD tray. 2. Remove the sensor board releasing the two tabs a. 3. Disconnect the harness from the connector CW1 on the sensor board.
CW1 Tab a
A
Sensor board
Removing the turn tray motor (See Fig.6 and 7)
Prior to performing the following procedure, remove the CD tray and sensor board. 1. Remove the screw B attaching the turn tray. Detach the turn tray from the base tray. 2. Pull outward the tab b attaching the turn tray motor on the base tray and detach the turn tray motor.
Introductory notes: Base tray + Turn tray = CD tray
Fig.5
Turn tray
Base tray
B
Fig.6
Turn tray motor Base tray (upper side)
Tab b
Fig.7
1-12
MA-GA77 Removing the belt, the CD board and the switch board (See Fig.8 and 9)
Prior to performing the following procedure, remove the CD tray. 1. Detach the belt from the pulley on the upper side of the CD changer unit (Do not stain the belt with grease). 2. Disconnect the card wire from the pickup unit connector on the under side of the CD changer unit.
CD changer unit Belt
Attention : Solder is put up before the card wire is removed from the pick-up unit connector on the CD mechanism assembly. (When the card wire is removed without putting up solder, the CD pick-up unit assembly might destroy.) 3. Disconnect the motor wire harness from connector on the CD board. 4. Remove the screw C attaching the switch board and release the two tabs e attaching the switch board outward and detach the switch board. 5. Remove the two screws D attaching the CD board. First release the two tabs f and two tabs g attaching the motor, then release the CD board. If the tabs f and g are hard to release, it is recommendable to unsolder the two soldered parts on the motor terminal of the CD board.
Fig.8
D
Tabs e
CD board Tabs g Soldered parts Motor Tabs f
C
Switch board CW3 CD mechanism board motor connecter Pickup unit connector
Card wire
Soldering
Picup unit connector
Fig.9
1-13
MX-GA77 Removing the CD mechanism holder assembly (mechanism included) (See Fig.10 to 13)
1. Disconnect the harness from connector on the CD mechanism board in the CD mechanism assembly on the under side of the CD changer unit. Disconnect the card wire from the pickup unit connector. Attention : Solder is put up before the card wire is removed from the pick-up unit connector on the CD mechanism assembly. (Refer to Fig.9) (When the card wire is removed without putting up solder, the CD pick-up unit assembly might destroy.)
Motor connecter
CD changer unit CD mechanism holder assembly Pickup unit connector
2. Remove the screw E attaching the shaft on the right side of the CD mechanism holder assembly. Pull outward the stopper fixing the shaft on the left side and remove the CD mechanism holder assembly from behind in the direction of the arrow y. 3. Turn the CD mechanism holder assembly half around the lift up slide shaft h of the CD mechanism holder assembly until the turn table is reversed, and pull out the CD mechanism holder assembly.
Fig.10
E
Stopper CD mechanism holder assembly
Fig.11
Lift up slide shaft n Lift up slide shaft
y
CD mechanism holder assembly
CD mechanism holder assembly
Fig.13 1-14
Fig.12
MA-GA77
·
Removing the CD mechanism holder from the CD chager unit. (Refer to "Removing the CD mechanism holder assembly" )
Shutter Pickup unit Shaft
A
Removing the pickup unit
(See Fig.1)
1. Removing the cut washer on the feed gear sleeve and pull out the feed gear. 2. Remove the two screws A fixing the pickup shaft. 3. Removing the pickup unit.
A B
Cut washer Feed Gear Fig.1
Removing the motor board
2. Remove the moter board.
(See Fig.2)
1. Unsolder the motor terminal on the motor board.
Removing the feed motor
(See Fig.1) Remove the two motor fixing screws at B and removing the feed motor.
Motor board
Unsolder Feed motor
Removing the spindle motor
The spindle motor cannot be removed as a single unit. When removing the spindle motor, change the chasis and turntable together as aunit.
Spindle motor
Unsolder Fig.2
1-15
MX-GA77
Prior to performing the following procedure, remove the cassette mechanism assembly.
R/P Head
Removing the R/P head. (See Fig.1 and 2)
1. Remove the screw A on the right side of the R/P head. 2. Remove the screw B on the left side of the R/P head. Pinch roller
Remove the erase head.
(See Fig.1)
E. Head
C B
A
Fig.1
1. Remove the screw C fixing the erase head.
B
A
Spring
R/P Head Fig.2 Pinch roller stopper
Remove the pinch roller.
1. Pull out the pinch roller stopper. 2. Pull out the pinch roller.
(See Fig.3)
Pinch roller
Fig.3
1-16
MA-GA77 Removing the motor (See Fig. 4 to 6)
1. Slide the plastic cover in the direction of the arrow, and remove the three claws. Then remove the plastic cover. 2. Remove the two screws D fixing the motor. Be careful to grease's splash when the drive belt comes off. 3. Unsolder the motor terminal.
D
Plastic cover
Removing the mechanism board (See Fig. 5)
1. Unsolder the four solder parts a and the four solder parts b. 2. Remove the two screws E attaching the mecha. board.
Claw
Fig.4
E
Removing the flywheel (See Fig. 7 and 9)
1. Remove the cut-washer at c from the capstan shaft, then remove the flywheel. When reassembling the flywheel, be sure to use new washers as they cannot be reused.
Solder part a
Solder part b
Motor terminal
Solder part a
E
Mecha. board
Motor
Drive belt
Fig.5
Drive belt
Motor
Flywheel FR belt
Drive belt
Fig.6 Fig.8 c
Sleeve Washer
FR belt Capstan washer
Fig.9 Fig.7 1-17
MX-GA77
< Speaker section >
It is exchange in a unit. Please do not decompose as much as possible.
A
A
Removing the side panel
(See Fig. 1)
1. Remove the five screws A attaching the side panel and remove the side panel. A
Side panel
Fig.1
Removing the side speaker (See Fig. 2 and 3)
Prior to performing the following procedure, remove the side panel. 1. Remove the four screws B attaching the side speaker. 2. Pull out the side speaker and remove the speaker cord from the speaker terminal.
B
Side speaker
Fig.2
Side speaker
Speaker terminal
Fig.3
1-18
3809-001413
AH39-00295A 3809-001211
3809-001434
CD switch board
UCW03 ACW2
Amp. board
CON01
Tuner board
3809-001228
0
9
ACW1
CW101 UCW02 UCW04 UCW01 UCW05
CW104 CW103
Front board
9
0
CW109
CW110
Wiring connection
CW105
CW111
Main board
CW108
PW103
CW107
9 0
9
0
0
3809-001259
2
9
CW11 CW106
0
PCW1
9 Power transformer
PW102
9 0
2
0
9
AH39-00466A
0
9
AH39-00338A
0
3809-001121 AH39-20561P
CW01B
9
0
9
AH39-00247A
0
AH39-00022A
Headphone J.board
9
9
0
0
9 0
CW3 CW101 CW104
CD mechanism
CW2 CW3 CW1
8 8 2
AH38-12001A
9
AAN1 CW102 CW103
2 0
CW107 CW105 CW106
AH39-20002D
9
2 9 0 2 8 8 9 0 9
0
0
0
0
9
CD board 0
AH39-00060A
9
2 0
3809-001034
Color codes are shown below. 1 Brown 2 Red 3 Orange 4 Yellow 5 Green 6 Blue 7 Violet 8 Gray 9 White 0 Black
2
MA-GA77
1-19
MX-GA77
Adjustment method
1. Tuner
* Adjustment Location of Tuner PCB
ITEAM
Received FREQ. Adjustment point
AM(MW) OSC Adjustment 522~1629 KHz MO 1~7.0 0.5V
AM(MW) RF Adjustment 594 KHz MA
Maximum Output(Fig.1)
Output
MAIN PCB
VT
GND
TESTER
Fig.1 OSC Voltage 1-20
MA-GA77
FM THD Adjustment SSG FREQ. Adjustment point (FM DET) Output 98 MHz FM DETECTOR COIL 60 dB Speaker Terminal output Distortion Meter Fig.2 IF CENTER and THD Adjustment Output GND FM S.S.G FM Antenna SET Terminal Input Oscilloscope
Minumum Distortion (0.4% below) (Fig.2)
Input
FM Search Level Adjustment SSG FREQ. Adjustment point (SVR1) Output 98 MHz BEACON SENSITIVITY SEMI-VR(10K ) 28 dB( 2dB) FM S.S.G 28 dB FM Antenna SET GND FM IN
Adjust SVR1 (Fig.3) *Adjust FM S.S.G level to 28dB 20 k
Fig.3 FM Auto Search Level Adjustment
AM(MW) I.F Adjustment SSG FREQ. Frequency Adjustment point Maximum output (Fig.4) 450 kHz 522 kHz
AM IF 60cm
AM IF
OUTPUT AM SSG 450KHZ
INPUT
AM ANT IN Speaker Terminal
OUTPUT
VTVM
Oscilloscope
Fig.4 AM I.F Adjustment
1-21
MX-GA77
2. Cassette Deck
To adjust tape speed
Notes 1) Measuring tape: i) VT-712/MTT-111(or equivalent) (Tapes recorded with 3kHz) ii) AC-225/MTT-5512(or equivalent) 2) Connect the cassette deck to the frequency counter as in fig.1.
Cassette Deck
Frequency Counter
SPK OUT output Fig.1
Step 1
Item NOR SPEED Control
Pre-Setup Condition SPK OUT (connected to the frequency counter)
Pre-Setup 1) Deck 1:VT-712 2) Press PLAY SW button 3) Deck 2:Same as above
To Adjust Turn VSR1 to left and right (FRONT PCB)
Standard 3KHz
Remark
1%
range
To adjust plabyback level/REC
Notes 1) Before the actual adjustment, clean the play/recording head. 2) Measuring tape : i) VT-703/MTT-114N(or equivalent 10kHz AZIMUTH control) ii) AC-225/MTT-5512(or equivalent) 3) The cassette deck is connections as shown in fig.2.
MAIN PCB
SPK OUT
VTVM
Oscilloscope
(GND)
In Out Fig.2
1. Adjust Deck 1 Play Level
Step 1 Item AZIMUTH Pre-Setup Condition SPK OUT (VTVM is connected to the scope) Pre-Setup After putting VT-703 into Deck 1 - Press FWD PLAY button. To Adjust Standard Remark
After Turn the control Max output and same phase adjustment screw to as (both channels) secure it with shownin Fig.3. REGION LOCK.
1-22
MA-GA77
2. Adjust Deck 2 Play Level/REC BIAS
Step Item Pre-Setup Condition SPK OUT (VTVM is connected to the scope) Pre-Setup
After putting VT-703 into Deck 2 1)Press FWD PLAY button.
To Adjust
Standard
Remark
1
AZIMUTH
Turn the control Max output screw to as and same phase shown in Fig.3. (both channels)
After adjustment secure it with REGION LOCK.
2
Recording Bias Voltage
Fig.4
After putting AC-225 into Deck 2 1)Press REC PLAY button. 2)TAPE PCB JCW3, connectted to VTVM
Turn JSR2L, JSR2R to the right and left
CHECK TO 7mV( 0.5mV)
Recording /Play head
AZIMUTH control screw (FWD Play)
AZIMUTH control screw (RVS Play) Fig.3
Audio OSC.
SET (MAIN PCB)
VTVM
Oscilloscope
IN
TP SPK OUT
AUX IN
IN
OUT
Fig.4
1-23
MX-GA77
Flow of functional operation until TOC read
Check Point
Power ON
Play Key
RESET a CD LSI
Confirm that the voltage at the pin17 of KB9226(IC101) is "L" "H".
LIMIT SW ON
Confirm that the voltage at the pin33 of KB9226(IC101) is "H" "L" "H".
SET Default value of TE gain, TE balance
Automatic adjusting of focus bias
Automatic adjusting of FE offset
Automatic adjusting of TE offset
LASER power ON
Confirm that the voltage at the pin37 of KB9226(IC101) is 3.5V.
Detection of disk
Tracking error waveform at TOC reading Pin 34 of KB9226 (IC101)
Approx 0.4V 2.50V
Approx.3.7sec
Disc is rotated
Confirm that the signal from pin24 of KB9226(IC101) is 3.5V as a accelerated pulse during approx.1.96s. Confirm the waveform of the Tracking error signal at the pin 34 of KB9226(IC101).
Automatic adjusting of TE balance
Disc states to rotate
Automatic adjusting of TE gain
TOC reading
Confirm the eye-pattern at the pin2 of KB9226(IC101).
Play a disc
1-24
MA-GA77
Maintenance of laser pickup
(1) Cleaning the pick up lens Before you replace the pick up, please try to clean the lens with a alcohol soaked cotton swab. (2) Life of the laser diode When the life of the laser diode has expired, the following symptoms will appear. 1. The level of RF output (EFM output : amplitude of eye pattern) will below.
Is the level of RF OUT under 1.1V 0.2Vp-p?
NO
Replace it.
YES O.K (3) Semi-fixed resistor on the APC PC board The semi-fixed resistor on the APC printed circuit board which is attached to the pickup is used to adjust the laser power. Since this adjustment should be performed to match the characteristics of the whole optical block, do not touch the semi-fixed resistor. If the laser power is lower than the specified value, the laser diode is almost worn out, and the laser pickup should be replaced. If the semi-fixed resistor is adjusted while the pickup is functioning normally, the laser pickup may be damaged due to excessive current.
Replacement of laser pickup
Turn off the power switch and,disconnect the power cord from the ac outlet.
Replace the pickup with a normal one.(Refer to "Pickup Removal" on the previous page)
Plug the power cord in,and turn the power on. At this time,check that the laser emits for about 3seconds and the objective lens moves up and down. Note: Do not observe the laser beam directly.
Play a disc.
Check the eye-pattern at TP1.
Finish. 1-25
MX-GA77
Troubleshooting
1. Amplifier
Power malfunction
No output
1-26
MA-GA77
2.Tuner malfunction (FM/AM)
3.Tape
1-27
MX-GA77
4.CD
1-28
MA-GA77
5.CD - MP3 parts
1-29
MX-GA77
Description of major ICs
LC876764 (UIC1) : Microcontroller
1.Pin layout
S47/PF7 S46/PF6 S45/PF5 S44/PF4 S43/PF3 S42/PF2 S41/PF1 S40/PF0 VDD4 S39/PE7 S38/PE6 S37/PE5 S36/PE4 S35/PE3 S34/PE2 S33/PE1 S32/PE0 S31/PD7 S30/PD6 S29/PD5 S28/PD4 S27/PD3 S26/PD2 S25/PD1 S24/PD0 S23/PC7 S22/PC6 S21/PC5 S20/PC4 FIX0
81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51
2.Block diagram
Interrupt Control
Stand-by Control
CF RC MRC X' tal
Clock Generator
Bus Interface
SIO0
SIO1
Timer 0
(High speed clock counter)
Timer 1
Base Timer
VFD Controller
INT 0 - 5 Noise Rejection
Ti mer 4
Ti mer 5
1-30
P16/T1PWML P17/T1PWMH/BUZ P30/INT4/T1IN P31/INT4/T1IN P32/INT4/T1IN P33/INT4/T1IN P34/INT5/T1IN P35/INT5/T1IN P36/INT5/T1IN P37/INT5/T1IN RES XT1/AN10 XT2/AN11 VSS1 CF1 CF2 VDD1 P80/AN0 P81/AN1 P82/AN2 P83/AN3 P84/AN4 P85/AN5 P86/AN6 P87/AN7/MICIN P70/INT0/T0LCP/AN8 P71/INT1/T0HCP/AN9 P72/INT2/T0IN/NKIN/AN12 P73/INT3/T0IN/AN13 S0/T0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
S48/PG0 S49/PG1 S50/PG2 S51/PG3 P00 P01 P02 P03 VSS2 VDD2 P04 P05 P06 P07 P10/SO0 P11/SI0/SB0 P12/SCK0 P13/SO1 P14/SI1/SB1 P15/SCK1
50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31
S19/PC3 S18/PC2 S17/PC1 S16/PC0 VDD3 S15/T15 S14/T14 S13/T13 S12/T12 S11/T11 S10/T10 S9/T9 S8/T8 S7/T7 S6/T6 S5/T5 S4/T4 S3/T3 S2/T2 S1/T1
IR
PLA
ROM
PC
ACC
Port 0
B Register
Port 1
C Register
Port 3 AL U Port 7
Port 8
PSW
ADC
RAR
Weak Signal Detector
RAM
Ti mer 6
Stack Pointer
Ti mer 7
Watch Dog Timer
MA-GA77
3. Pin function
Pin name VSS1, 2 VDD1,2,3,4 FIX0 PORT0 P00 to P07 I/O I/O
(1/2)
Function Power supply (-) Power supply (+) Test pin Set as VSS with the user's option. (see Note 1) · 8bit input/output port · Data direction programmable in nibble units · Use of pull-up resistor can be specified in nibble units · Input for HOLD release · Input for port 0 interrupt · 15V withstand at N-channel open drain output · 8bit input/output port · Data direction programmable for each bit · Use of pull-up resistor can be specified for each bit · Other pin functions P10: SIO0 data output P11: SIO0 data input / bus input / output P12: SIO0 clock input / output P13: SIO1 data output P14: SIO1 data input / bus input / output P15: SIO1 clock input / output P16: Timer 1 PWML output P17: Timer 1 PWMH output / Buzzer output · 8bit input/output port · Data direction can be specified for each bit · Use of pull-up resistor can be specified for each bit · 15V withstand at N-channel open drain output · Other functions: P30 to P33: INT4 input / HOLD release input / Timer 1 event input / Timer 0L capture input / Timer 0H capture input P34 to P37: INT5 input / HOLD release input / Timer 1 event input / Timer 0L capture input / Timer 0H capture input · 4bit input/output port · Data direction can be specified for each bit · Use of pull-up resistor can be specified for each bit · Other functions P70: INT0 input / HOLD release input / Timer0L capture input / Output for watchdog timer P71: INT1 input / HOLD release input / Timer0H capture input P72: INT2 input / HOLD release input / Timer 0 event input / Timer0L capture input / High speed clock counter input P73: INT3 input(noise rejection filter attached input) / Timer 0 event input / Timer 0H capture input AD input port: AN8(P70), AN9(P71), AN12(P72), AN13(P73) · 8bit input/output port · Input/output can be specified in a bit unit · Other functions: AD input port: AN0 to AN7 Weak signal detector input port: MICIN(P87) · Large current output for VFD display controller digit (can be used for segment) · Large current output for VFD display controller segment/digit · Output for VFD display controller segment/digit · Other functions: High voltage input port: PC0 to PC7 · Output for VFD display controller segment · Other functions: High voltage input port: PD0 to PD7
PORT1 P10 to P17
I/O
PORT3 P30 to P37
I/O
PORT7 P70 to P73
I/O
PORT8 P80 to P87
I/O
S0/T0 to S8/T8 S9/T9 to S15/T15 S16 to S23
O O I/O
S24 to S31
I/O
1-31
MX-GA77
3. Pin function
Pin name S32 to S39 I/O I/O Function · Output for VFD display controller segment · Other functions High voltage input port: PE0 to PE7 · Output for VFD display controller segment · Other functions: High voltage input/output port: PF0 to PF7 · Output for VFD display controller segment · Other functions: High voltage input/output port: PG0 to PG3 Reset terminal · Input for 32.768kHz crystal oscillation · Other functions: General purpose input port When not in use, connect to VDD1. AD input port: AN10 · Output for 32.768kHz crystal oscillation · Other functions: General purpose input port When not in use, set to oscillation mode and leave open circuit. AD input port: AN11 Input terminal for ceramic oscillator Output terminal for ceramic oscillator
(2/2)
S40 to S47
I/O
S48 to S51
I/O
RES XT1
I I
XT2
I/O
CF1 CF2
I O
KA9258D (IC301) : 4-ch Motor driver
1.Block diagram
28
27
26
25
10K
24
23
22
GND
21
20
19
10K
18
17
16
15
VCC
VCC 10K
10K
REGULATOR T·S·D
10K
50K MUTE
+ LEVEL SHIFT
+ LEVEL SHIFT
10K
1
1-32
2
3
10K
4
5
6
7
10K
GND
8
9
10
11
12
13
14
MA-GA77
HA12237 (JIC01) : Audio signal processor
TEST (Open for normal use)
1. Block diagram
14 MUTE ON/OFF
13 A A/B (REC RETURN ON/OFF)
15 REC MUTE OFF/ON
18 GND
ALC
21
12 High/Normal
19 IREF
11 ALC ON/OFF
17 ALCDET
16 Vcc
20
REC OUT(L)
10
REC OUT(R)
NC
22
EQ
EQ
NC
ALC(L)
23
9 8 7 6 5 3 2 1 4
ALC(R)
REC IN(L)
24
REC IN(R)
NC
25
NC
TAI(L)
27
MUTE
MUTE
PB OUT(L)
26
PB OUT(R)
TAI(R)
120/60 (Norm/High)
EQOUT(L)
120/60 (Norm/High)
28
EQOUT(R)
Return SW
PB-EQ(L)
Return SW
29
PB-EQ(R)
B
+
A
PB-NF2(L)
30
B
+
PB-NF1(L) 31
AIN(R) 39
IN(L) 34
REC Return 35
AIN(L) 32
GND 36
A
PB-NF2(R)
2. Pin function
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Symbol PB-NF2(R) PB-EQ(R) EQOUT(R) TAI(R) PBOUT(R) NC RECIN(R) NC RECOUT(R) ALC ON/OFF High/Norm A/B MUTE ON/OFF Function PB EQ feed back NAB output EQ output Tape input PB output NC pin REC-EQ input NC pin REC output Mode control input Mode control input Mode control input Mode control input Pin No. Symbol 15 REC MUTE OFF/ON 16 Vcc 17 GND 18 IREF 19 20 21 22 23 24 25 26 Test mode RECOUT(L) NC RECIN(L) NC PBOUT(L) Pin No. 27 28 Vcc pin 29 30 GND pin 31 Equalizer reference 32 current input 33 Test mode pin 34 REC output 35 NC pin 36 37 REC-EQ input 38 NC pin 39 PB output 40 Function Mode control input Symbol TAI(L) EQOUT(L) PB-EQ(L) PB-NF2(L) PB-NF(L) AIN(L) RIP BIN(L) REC-RETURN GND BIN(R) NC AIN(R) PB-NF1(R) Function Tape input EQ output NAB output PB EQ feed back PB EQ feed back PB A deck input Ripple filter PB B deck input REC Return GND pin PB B deck input NC pin PB A deck input PB EQ feed back
PB-NF1(R) 40
IN(R) 37
RIP 33
NC 38
1-33
MX-GA77
KB9226 (IC101) : RF amp. & servo signal processor
1. Pin layout
36 35 34 33 32 31 30 29 28 27 26 25
TZC/SSTOP
LPFT
GND
SLO
FEO
TEO
ATSC
TEIO
FEM
TEM
37 LD 38 PD
SLM
12
SLP
SPO 24 SPM 23 ASY 22 EFM 21 LOCK 20 WDCK 19
39 PDAC 40 PDBD 41 PDF 42 PDE 43 DCB 44 MCP 45 DCCI 46 DCCO 47 VREF
S1L9226X
CLVI 18 RESET 17 MLT 16 MDATA 15 MCK 14
FRSH
48 EQC
ISTAT 13
FSET
EFMI
EQO
RFM
RFO
VCC
FGD
1
2
3
4
5
6
7
8
9
10
11
2. Block diagram
PDBD PDAC
39
VREF
EQC
RFM
RFO
PDE
TGU
FLB
EQI
FSI
3
2
1
48
47
42
41
PDF
EQI
40
EQO EFMI
4 5
RF AGC & EQ Control Focus OK Detect Defect Detect Mirror Gen
Center Voltage
Tracking Error (RW) I/V AMP
RF & Focus Error (CD-RW) I/V AMP
38 PD 37 LD 35 LPFT 34 TEIO
DCCI 45 DCC0 46 MCP 44 DCB 43 VCC/ VDD FRSH FSET FLB
APC. Laser Control & LPC
Focus Servo Loop - Gain & Phase Compensation - Focus Search - Offset Adjust - FZC Gen.
6 7 8 9
Tracking Servo Loop - Gain & Phase Compensation - Track Jump - Offset Adjust - TZC Gen.
TZC& SSTOP 36 ATSC 33 29 TEO 28 TEM
FGD 10
Hardware Logic - Auto-Sequencer - Fast Search - Febias, Focus Servo, Tracking Offset ADJ. - Tracking Balance & Gain Adjust - Interruption Detect - EFM Muting System
Sled Servo & Kick Gen
27 SLP 26 SLO 25 SLM
29 FEO 30 FEM 23 SPDLO 24 SPDLM
FSI 11
TGU 12 Micom Data Interface Logic Decoder
EFM Comparator 18 20 22 21
Spindle Servo LPF
13
14
15
16
17
19
MDATA
WDCK
RESET
ISTAT
LOCK
MCK
CLVI
MLT
ASY
1-34
EFM
MA-GA77
3. Pin function Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Symbol RFM RFO EQI EQO EFMI VCC FRSH FSET FLB FGD FSI TGU ISTAT MCK MDATA MLT RESET CLVI WDCK LOCK EFM ASY SPM SPO SLM SLO SLP TEM TEO FEM FEO GND TZC/ SSTOP TEIO LPFT ATSC LD PD PDAC PDBD PDF PDE DCB MCP DCCI DCCO VREF EQC I/O I O I O I P I I I I I I O I I I I I I I O I I O I O I I O I O P I B I I O I I I I I I I O I O I Function RF summing amp. inverting input RF summing amp. output RFO DC eliminating input(use by MIRROR, FOK ,AGC & EQ terminal) RF equalizer output EFM slice input. (input impedance 47K) Main power supply Capcitor connection to focus search Filter bias for focus,tracking,spindle Capacitor connection to make focus loop rising band Terminal to change the hign frequency gain of focus loop Focus servo input Connect the component to change the high frequency of tracking Loop Internal status output Micom clock Data input Data latch input Reset input Input the spindle control output from DSP 88.2KHz input terminal from DSP Sled run away inhibit pin (L: sled off & tracking gain up) EFM output for RFO slice(to DSP) Auto asymmetry control input Spindle amp. inverting input Spindle amp. output Sled servo inverting input Sled servo output Sled servo noninverting input Tracking servo amp.inverting input Tracking servo amp. output Focus servo amp. inverting input Focus servo amp. output pin Main ground Tracking zero crossing input & Check the position of pick-up wherther inside or not Tracking error output & Tracking servo input Tracking error integration input (to automatic control) Anti-shock input APC amp. output APC amp. input Photo diode A & C RF I/V amp. inverting input Photo diode B & D RF I/V amp. inverting input Photo diode F & tracking(F) I/V amp. inverting input Photo diode E & tracking(E) I/V amp. inverting input Capacitor connection to limit the defect detection Capacitor connection to mirror hold Output pin to connect the component for defect detect Input pin to connect the component for defect detect (VCC+GND)/2 Voltage reference output AGC_equalize level control terminal & capacitor terminal to input in to VCA
1-35
MX-GA77
5L9290 (IC201) : Digital signal processor for CDP
VDDD_DAC VDDA_DAC VSSD_DAC VSSA_DAC VDDA_PLL
1. Pin layout
RCHOUT
LRHOUT
VHALF
SADTI
LRCKI
38
VREF
48 VSSA_PLL VCO1LF 1 2
47
46
45
44
43
42
41
40
39
37 36 BCKO 35 LRCKO 34 SADTO 33 DATX 32 C2PO
VSSD_PLL 3 VDDD_PLL 4 VDDD1_5V 5 XIN XOUT 6 7
S5L9290X
DSP+DAC
48-LQFP-0707
BCKI
31 JITB 30 SBCK 29 VDDD3-5V 28 VSSD2-3V 27 VDDD2-3V 26 MUTE 25 SQDT
VSSD1_5V 8 EFMI 9
LOCK 10 SMEF 11 SMON 12
13
14
15
16
17
18
19
20
21
22
23
24
WDCK
SMDS
MDAT
RESETB
TESTV
2. Block diagram
SOS1 SQDT SBDT
SQCK SBCK
ISTAT
C2PO
SQCK
LKFS
LKFS
S0S1
MLT
MCK
DATX
VCO1LF EFMI DPLL
Subcode Out
Digital Out
LOCK SMEF SMDP SMDS WDCK
EFM Demodulator
Interpolator
Digital Filter
CLV Servo
ECC
1-bit DAC
WFCK RFCK C4M XIN ISTAT MLT MDAT MCK MUTE
Timing Generator
16K SRAM PWM
Micom Interface
Address Generator
I/O Interface
LPF
JITB
SADTO LRCKO BCKO
SADTI LRCKI BCKI
LCHOUT VHALF RCHOUT VREF
1-36
MA-GA77
3. Pin function NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 28 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Symbol VSSA_PLL VCO1LF VSSD_PLL VDDD_PLL VDDD1-5V XIN XOUT VSSD1 EFMI LOCK SMEF SMDP SMDS WDCK TESTV LKFS C4M RESETB MLT MDAT MCK ISTAT S0S1 SQCK SQDT MUTE VDDD2-3V VSSD2 VDDD3-5V SBCK JITB C2PO DATX SADTO LRCKO BCKO BCKI LRCKI SADTI VSSD_DAC VDDD_DAC RCHOUT VSSA_DAC VREF VHALF VDDA_DAC LCHOUT VDDA_PLL I/O O I O I O O O O O I O O I I I I O O I O I I O O O O O O I I I O O O O Function Analog Ground for DPLL Pump out for VCO1 Digital Ground Separated Bulk Bias for DPLL Digital Power Separated Bulk Bias for DPLL (3V Power) Digital Power (5V Power, I/O PAD) X'tal oscillator input (16.9344MHz) X'tal oscillator output Digital Ground (I/O PAD) EFM signal input CLV Servo locking status output LPF time constant control of the spindle servo error signal Phase control output for Spindle Motor drive Speed control output for Spindle Motor drive Word clock output (Normal Speed : 88.2KHz, Double Speed : 176.4KHz) Various Data/Clock Input The Lock status output of frame sync 4.2336MHz clock output System Reset at 'L' Latch signal input from Micom Serial data input from Micom Serial data receiving clock input from Micom The internal status output to Micom Subcode sync signal(S0+S1) output Subcode-Q data transfering bit clock input Subcode-Q data serial output System mute at 'H' Digital Power (3V Power, Internal Logic) Digital Ground (Internal Logic) Digital Power (5V Power, I/O PAD) Subcode data transfering bit clock Internal SRAM jitter margin status output C2 pointer output Digital audio data output Serial audio data output (48 slot, MSB first) Channel clock output Bit clock output Bit clock input Channel clock input Serial audio data input (48 slot, MSB first) Digital Ground for DAC Digital Power for DAC (3V Power) Right-Channel audio output through DAC Analog Ground for DAC Referance Voltage output for bypass Referance Voltage output for bypass Analog Power for DAC (3V Power) Left-Channel audio output through DAC Analog Power for PLL (3V Power)
1-37
MX-GA77 KS9274 (IC601) : CD-MP3 decoder
1.Block diagram
CD-ROM Decoder
20-22
MP3 Decoder
DAC INTERFACE
24-27
DRAM CONTROLLER
HOST MCU INTERFACE
44-63
35-39
1M 4bits DRAM
HOST MCU
2.Pin function 5 6 10 14 15 20 21 22 24 25 26 27 35 36 37 38 39 44 45 46 47 50 51 52 53-62 63 CLK RESETB FILTER_0 FILTER_1 PLL_BYPASS CD_DATA CD_LRCK CD_BCK ACLK BCLK LRCK ADAT MDAT MCK MLAT MDOUT MINT DDAT0 DDAT1 WEB RASB DDAT2 DDAT3 CASB DA9-DA0 OEB I I O O I I I I O O O O I I I O O System clock input System reset actibe LOW 820uF to GND940uF to GND When "HIGH" PLL is bypassed, Tied to LOW in normal operation
O O
O O O
Write/Read data from MCU to CD-MP3 Data strobe signal from MCU Micom command identifier from MCU to CD-MP3 Data from CD-MP3 to MCU Intertupt output to MCU Data BUS Data BUS Wtite enable Row address strobe Data BUS Data BUS Colume address strobe Address output Control output to make data output to "High-Z" at DRAM
KA3082 (IC401, IC402) : DC motor driver
1.Pin layout 2.Pin function
Pin No. 1 2 3 4 5 6 7 8 9 10 Symbol GND VO1 VZ1 VCTL VIN1 VIN2 SVCC PVCC VZ2 VO2 I/O O I I I O Function Ground Output 1 Phase compensation Motor speed control Input 1 Input 2 Supply voltage (Signal) Supply voltage (Power) Phase compensation Output 2
DRIVER OUT
PRE DRIVER
BIAS
LOGIC SWITCH
TSD
1
2
3
4
5
6
7
8
9
10
GND
VO1
VZ1
VCTL
VIN1
VIN2
SVCC
PVCC
VZ2
VO2
1-38
MA-GA77 TDA7442D (EIC01) : Audio processor
1.Pin layout
R_IN3 R_IN2 R_IN1 L_IN1 L_IN2 L_IN3 L_IN4 MUXOUTL IN(L) MUXOUT(R) IN(R) BIN(R) BOUT(R) BIN(L) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 R_IN4 LOUT ROUT AGND VS CREF SDA SCL DIG-GND TREBLE(R) TREBLE(L) PS1 LP BOUT(L)
2.Block diagram
100nF 2.2 F
IN(L)
5.6nF
5.6K 100nF
100nF
MUXOUT(L) 0.47 F L-IN1 50K 0.47 F L-IN2 50K 0.47 F L-IN3 0.47 F L-IN4 50K 6 50K 7 + + 5 4 31.5dB control 8
PS1 17 RPS1
TREBLE-L 18 14
BIN(L) BOUT(L) 15 RB
9
FIX
30K PS1 90Hz OFF 79dB CONTROL VAR SPKR ATT MUTE + FIX MIXING AMP TREBLE BASS 21 22 I2C BUS DECODER + LATCHES 20 TREBLE BASS FIX SURR VAR + 50K 30K OFF MUTE 79dB CONTROL 50K 31.5dB control 10 MUXOUT(R) 11
IN(R)
SYMULATED L+R MUSIC + L-R OFF
MUSIC/ SYMULATED
SURR
27
LOUT
SCL SDA DIG GND
0.47 F R-IN1
3 50K
0.47 F R-IN2
2 50K
LPF 9KHz
EFFECT CONTROL
MIXING AMP
0.47 F R-IN3 0.47 F R-IN4
SPKR ATT
1
26
ROUT
28 Vref RB 19 CREF TREBLE-R 12 BIN(R) 13 BOUT(R)
SUPPLY
16 LP
24 VS 1.2nF
25
AGND
23
D98AU947A
2.2 F
22 F 5.6nF 100nF 5.6K 100nF
BA4560 (FIC02) : Dual op amp.
1.Pin layout
OUT1 1 8 VCC
IN1 2 + IN1 3
1ch
7
OUT2
+
2ch
+
6
IN2
VEE 4
5
+ IN2
1-39
MX-GA77 L4959 (PIC02) : Voltage regulator
1.Pin layout
11 10 9 8 7 6 5 4 3 2 1 OUT 12V(a) VS OUT 8.6V EN 8.6V EN 12V(a) GND EN 12V(b) N.C. OUT 5.6V VS OUT 12V(b)
TAB CONNECTED TO PIN 6
D97AU716A
2.Block diagram
VS 2/10 5.6V, 250mA REGULATOR 8.6V, 600mA REGULATOR SWITCHED EN 8V 8 12V, 800mA REGULATOR SWITCHED EN 12V(a) 7 12V, 1.3A REGULATOR SWITCHED EN 12V(b) 5 1 11 3
OUT 5.6V
REF GEN
9
OUT 8.6V
OUT 12V(a)
OUT 12V(b)
6
D97AU569C
GND
3.Pin function
Pin 1 2 3 4 5 6 7 8 9 10 11 Pins OUT 12V (b) VS OUT 5.6V N.C. EN 12V (b) GND EN 12V (a) EN 8.6V OUT 8.6 VS OUT 12V (a) Description 12V/1.3A SWITCHED OUTPUT VOLTAGE Supply Voltage 5.6V/250mA OUTPUT VOLTAGE not connected Enable 12V/1.3A SWITCHED OUTPUT VOLTAGE Ground Enable 12V/0.8A SWITCHED OUTPUT VOLTAGE Enable 8.6V/0.6A SWITCHED OUTPUT VOLTAGE 8.6V/0.6A SWITCHED OUTPUT VOLTAGE Supply Voltage 12V/0.8A SWITCHED OUTPUT VOLTAGE
1-40
MA-GA77 M11L1644 (IC602) : DRAM
1. Block diagram WE RAS CAS CONTROL LOGIC CLOCK GENERATOR COLUMN ADDRESS BUFFER REFRESH CONTROLLER REFRESH COUNTER
11
DATA-IN BUFFER
4
I/O0 . . I/O3
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 A10
11
COLUMN DECODER
2048
4
DATA-OUT BUFFER
4
CE
SENSE AMPLIFIERS I/O RATING
2048 x 4
ROW DECODER
11
2048
11
ROW ADDRESS BUFFERS(11)
2048 x 2048 x 4 MEMORY ARRAY
11
Vdd GENERATOR 2. Pin function
Pin No. 3~11, 14~19, 7 5 21 4 20 2, 3,22, 23 1, 12 13, 24 6 Symbol A0~A10 RAS CAS WE OE I/O0~I/O3 Vcc Vss NC I/O I I I I I I/O Function Address Input Row Address : A0~A10 Column Address : A0~A10 Row Address Strobe Column Address Strobe Write Enable Output Enable Data Input/ Ountput Power (5V or 3.3V) Ground No Connect
Vcc Vss
-
1-41
MX-GA77
STK403-070 (FIC01) : Power amp.
1.Pin layout
+Vcc -Vcc Ch1 out Ch1 out Ch2 out Ch2 out +TRE SUB GND Ch1 IN Ch1 Ch2 NF ST-BY NF Ch2 IN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2.Block diagram
2 7
TR1
TR4
10 11
Pre Driver IC CH1
R1 TR3 R2
R5
R7 TR6 R8
R3 R4
Pre Driver IC CH2
14 13
R6
C1 TR2 TR5
C2
Bias Circuit 1
SUB
8
9
4 3
5 6
12
STK403-100 (WIC01) : Power amp.
1.Pin layout
Ch1 Ch1 Ch2 Ch2 Ch1 Ch1 Ch2 Ch2 -PRE -Vcc +Vcc OUT OUT OUT OUT +PRE SUB GND IN NF ST-BY NF IN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
2.Block diagram
3 8
11 12 Pre Driver IC CH1 1 2 Bias Circuit Pre Driver IC CH2
15 14
9
1-42
10
5 4 6 7
13
MA-GA77 PT8300 (UIC03, UIC04) : DRAM
1.Pin layout
VSS /RESET CLK LATCH P15 P14 P13 P12 P11 P10 P9 P8 LATCH0 CLK0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 VDD PULLUP DI1 DO2 P0 P1 P2 P3 P4 P5 P6 P7 DI2 DO1
2.Block diagram PULLUP
27
P0 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14 P15
VDD VSS
28
1
4
LATCH CLK DI1 /RESET /RESET CLKO DI2 LATCH0 DO2 DO1
3 26
LATCH RESET
O0 I0 LATCH 16-BIT
O7 O8 I7 I8
O15 I15
CLK Q0 SHIFT REGISTER1: 16-BIT SHIFT REGISTER SERIAL TO PARALLEL DI RESET 2 14 16 13 25 15 CLK DI D0 SHIFT REGISTER2: 16-BIT SHIFT REGISTER SERIAL TO PARALLEL
Q15 DO
D15 DO
3. Pin function Pin No. Pin Name I/O 1 VSS 2 /RESET I 3 CLK I 4 LATCH I 5-12 P15~P8 I/O 13 LATCHO O O 14 CLKO 15,25 DO1, DO2 O I 26,17 DI1, DI2 O 17-24 P7~P0 I 27 PULLUP Function Ground Reset pin Clock input pin Latch input pin Parallel data I/O pins Latch output pin Clock output pin Serial data output pins Serial data input pins Parallel data output pin P8 to P15 control pin for internal pull-up resistor When P8 to P15 are in the output state, the PULLUP pin must be connected to VDD. When P8 to P15 are in the input state, the PULLUP pin must be connected to VSS. Power supply pin 1-43
28
VDD
-
MX-GA77 LA72723(IC03) : RDS demodulation
1. Pin layout
VREF MPXIN Vdda Vssa FLOUT CIN TES XOUT 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 RDS-ID/READY RDCL RDDA RST MODE Vddd Vssd XIN
2. Block Diagram
VREF
Vdda
FLOUT CIN CLOCK RECOVERY (1187.5Hz)
+ REFERENCE VOLTAGE -
PLL (57kHz)
Vddd
Vssa
MPXIN
ANTI ALIASING FILTER
57kHz BPF (SCF)
VREF SMOOTHING FILTER DATA DECODER
Vssd
RDDA RDCL
RAM (128-bits)
MODE
RST CLK(4.332MHz)
TEST
TEST OSC
RDS-ID DETECT
RDS-ID/ READY
XIN
XOUT
3. Pin functions
Pin No.
Symbol VREF MPXIN Vdda Vssa FLOUT CIN TEST XOUT XIN Vssd Vddd MODE RST RDDA RDCL RDS-ID READY
I/O O I
Function Reference voltage output (Vdda/2) Baseband (multiplexed) signal input Analog power supply (+5V) Analog ground Subcarrier input (filter output) Subcarrier input (comparator input) Test input Crystal oscillator output (4.332MHz) Crystal oscillator input (exeternal reference input) Digtal ground Digtal power supply Read mode setting (0:master,1:slave) RDS-ID/RAM reset (positive polarity) RDS data output RDS clock output (master mode)/RDS clock input (slave mode) RDS-ID/READY output (negative polarity)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
O I I O I
I I O I/O O
1-44
MA-GA77
< MEMO >
1-45
MX-GA77
VICTOR COMPANY OF JAPAN, LIMITED AV & MULTMEDIA COMPANY AUDIO/VIDEO SYSTEM CATEGORY 10-1,1 chome,Ohwatari-machi,maebashi-city,371-8543,Japan
(No.22083)
Printed in Japan 200307
COMPACT COMPONENT SYSTEM
CA-MXGT88 CA-MXGA77
CA-MXGT88
CD 1
STANDBY
CA-MXGA77
CD 2 CD 3 DISC CHANGE
STANDBY
CD 1
CD 2
CD 3 DISC CHANGE
ECO
ECO
COMPACT
COMPONENT
SYSTEM
MX-GT88
COMPACT
COMPONENT
SYSTEM
MX-GA77
REC START / STOP
R O C K
D A N C E
REPEAT
REC START / STOP
R O C K
D A N C E
REPEAT
CD REC START
P O P
H A L L
PROGRAM
CD REC START
P O P
H A L L
PROGRAM
DUBBING
CLASSIC
STADIUM
RANDOM
DUBBING
CLASSIC
STADIUM
RANDOM
DISPLAY
VOLUME
CLOCK / TIMER
DISPLAY
VOLUME
CLOCK / TIMER
PHONES
UND MODE SO
PRESET
SET
PHONES
UND MODE SO
PRESET
SET
CANCEL / DEMO
CANCEL / DEMO
SOUND TURBO
TAPE A / B
SOUND TURBO
TAPE A / B
DISPLAY MODE RDS MODE
SELECT
DISPLAY MODE RDS MODE
SELECT
SUBWOOFER LEVEL
TUNING TUNING
SUBWOOFER LEVEL
TUNING TUNING
BEEP
BEEP
MP3
MP3
EJECT
EJECT
EJECT
EJECT
INSTRUCTIONS
For Customer Use: Enter below the Model No. and Serial No. which are located either on the rear, bottom or side of the cabinet. Retain this information for future reference. Model No. Serial No.
LVT1010-003B
[B]
Warnings, Cautions and Others
IMPORTANT for the U.K. DO NOT cut off the mains plug from this equipment. If the plug fitted is not suitable for the power points in your home or the cable is too short to reach a power point, then obtain an appropriate safety approved extension lead or consult your dealer. BE SURE to replace the fuse only with an identical approved type, as originally fitted. If nonetheless the mains plug is cut off ensure to remove the fuse and dispose of the plug immediately, to avoid a possible shock hazard by inadvertent connection to the mains supply. If this product is not supplied fitted with a mains plug then follow the instructions given below: IMPORTANT: DO NOT make any connection to the terminal which is marked with the letter E or by the safety earth symbol or coloured green or green-and-yellow. The wires in the mains lead on this product are coloured in accordance with the following code: Blue : Neutral Brown : Live As these colours may not correspond with the coloured markings identifying the terminals in your plug proceed as follows: The wire which is coloured blue must be connected to the terminal which is marked with the letter N or coloured black. The wire which is coloured brown must be connected to the terminal which is marked with the letter L or coloured red. IF IN DOUBT - CONSULT A COMPETENT ELECTRICIAN. 2 WARNING LABEL, PLACED INSIDE THE UNIT
CAUTION: Invisible laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE (e) TO BEAM. VARNING: Osynlig laserstrålning när denna del är öppnad och spärren är urkopplad. Betrakta ej (s) strålen. ADVARSEL: Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion. Undgå udsæt(d) telse for stråling VARO: Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättömälle lasersäteilylle. Älä katso (f) säteeseen.
IMPORTANT FOR LASER PRODUCTS
REPRODUCTION OF LABELS 1 CLASSIFICATION LABEL, PLACED ON EXTERIOR SURFACE
1. CLASS 1 LASER PRODUCT 2. CAUTION: Invisible laser radiation when open and interlock failed or defeated. Avoid direct exposure to beam. 3. CAUTION: Do not open the top cover. There are no user serviceable parts inside the Unit; leave all servicing to qualified service personnel.
switch! Caution Disconnect the mains plug to shut the power off completely. The switch in any position does not disconnect the mains line. The power can be remote controlled.
CAUTION To reduce the risk of electrical shocks, fire, etc.: 1. Do not remove screws, covers or cabinet. 2. Do not expose this appliance to rain or moisture.
CAUTION · Do not block the ventilation openings or holes. (If the ventilation openings or holes are blocked by a newspaper or cloth, etc., the heat may not be able to get out.) · Do not place any naked flame sources, such as lighted candles, on the apparatus. · When discarding batteries, environmental problems must be considered and local rules or laws governing the disposal of these batteries must be followed strictly. · Do not expose this apparatus to rain, moisture, dripping or splashing and that no objects filled with liquids, such as vases, shall be placed on the apparatus.
Caution: Proper Ventilation
To avoid risk of electric shock and fire, and to prevent damage, locate the apparatus as follows: 1 Front: No obstructions and open spacing. 2 Sides/ Top/ Back: No obstructions should be placed in the areas shown by the dimensions below. 3 Bottom: Place on the level surface. Maintain an adequate air path for ventilation by placing on a stand with a height of 10 cm or more. Front view
15 cm 1 cm 15 cm 1 cm 15 cm
Side view
15 cm
CA-MXGT88 CA-MXGA77
15 cm
CA-MXGT88 CA-MXGA77
10 cm
G-1
SAFETY INSTRUCTIONS "SOME DOS AND DON'TS ON THE SAFE USE OF EQUIPMENT"
This equipment has been designed and manufactured to meet international safety standards but, like any electrical equipment, care must be taken if you are to obtain the best results and safety is to be assured.
Do read the operating instructions before you attempt to use the equipment. Do ensure that all electrical connections (including the mains plug, extension leads and interconnections between pieces of equipment) are properly made and in accordance with the manufacturer's instructions. Switch off and withdraw the mains plug when making or changing connections. Do consult your dealer if you are ever in doubt about the installation, operation or safety of your equipment. Do be careful with glass panels or doors on equipment.
DON'T continue to operate the equipment if you are in any doubt about it working normally, or if it is damaged in any wayswitch off, withdraw the mains plug and consult your dealer. DON'T remove any fixed cover as this may expose dangerous voltages. DON'T leave equipment switched on when it is unattended unless it is specifically stated that it is designed for unattended operation or has a standby mode. Switch off using the switch on the equipment and make sure that your family know how to do this. Special arrangements may need to be made for infirm or handicapped people. DON'T use equipment such as personal stereos or radios so that you are distracted from the requirements of traffic safety. It is illegal to watch television whilst driving. DON'T listen to headphones at high volume as such use can permanently damage your hearing. DON'T obstruct the ventilation of the equipment, for example with curtains or soft furnishings. Overheating will cause damage and shorten the life of the equipment. DON'T use makeshift stands and NEVER fix legs with wood screws -- to ensure complete safety always fit the manufacturer's approved stand or legs with the fixings provided according to the instructions. DON'T allow electrical equipment to be exposed to rain or moisture. ABOVE ALL -- NEVER let anyone, especially children, push anything into holes, slots or any other opening in the case -this could result in a fatal electrical shock.; -- NEVER guess or take chances with electrical equipment of any kind -- it is better to be safe than sorry!
G-2
Introduction
We would like to thank you for purchasing one of our JVC products. Before operating this unit, read this manual carefully and thoroughly to obtain the best possible performance from your unit, and retain this manual for future reference.
About This Manual
This manual is organized as follows: · The manual mainly explains operations using the buttons and controls on the unit. You can also use the buttons on the remote control if they have the same or similar names (or marks) as those on the unit. If operation using the remote control is different from that using the unit, it is then explained. · Basic and common information that is the same for many functions is grouped in one place, and is not repeated in each procedure. For instance, we do not repeat the information about turning on/off the unit, setting the volume, changing the sound effects, and others, which are explained in the section "Common Operations" on pages 9 to 11. · The following marks are used in this manual: Gives you warnings and cautions to prevent damage or risk of fire/electric shock. Also gives you information which is not good for obtaining the best possible performance from the unit. Gives you information and hints you had better know.
Power sources
· When unplugging from the wall outlet, always pull the plug, not the AC power cord.
DO NOT handle the AC power cord with wet hands.
Moisture condensation
Moisture may condense on the lens inside the unit in the following cases: · After starting heating in the room · In a damp room · If the unit is brought directly from a cold to a warm place Should this occur, the unit may malfunction. In this case, leave the unit turned on for a few hours until the moisture evaporates, unplug the AC power cord, and then plug it in again.
Others
· Should any metallic object or liquid fall into the unit, unplug the unit and consult your dealer before operating any further. · If you are not going to operate the unit for an extended period of time, unplug the AC power cord from the wall outlet.
DO NOT disassemble the unit since there are no user serviceable parts inside.
Precautions
Installation
· Do not grasp the control knobs when moving or carrying the unit. · Install in a place which is level, dry and neither too hot nor too cold--between 5°C and 35°C. · Install the unit in a location with adequate ventilation to prevent internal heat built-up in the unit. · Leave sufficient distance between the unit and the TV. · Keep the speakers away from the TV to avoid interference with TV.
DO NOT install the unit in a location near heat sources, or in a place subject to direct sunlight, excessive dust or vibration.
If anything goes wrong, unplug the AC power cord and consult your dealer.
1
Contents
Location of the Buttons and Controls ....................... 3
Front Panel ................................................................. 3 Remote Control .......................................................... 5
Getting Started ............................................................ 6
Unpacking .................................................................. 6 Putting the Batteries into the Remote Control ........... 6 Connecting Antennas ................................................. 6 Connecting Speakers .................................................. 7 Connecting Other Equipment ..................................... 8 Canceling the Display Demonstration ....................... 8
Common Operations .................................................. 9
Turning On or Off the Power ....................................... 9 Saving the Power Consumption While on Standby --ECO Mode ........................................................ 9 Setting the Clock ........................................................ 9 Selecting the Sources ................................................... 9 Adjusting the Volume ............................................... 10 Reinforcing the Bass Sound ..................................... 10 Enjoying the Heavy Sound ....................................... 10 Selecting the Sound Modes ...................................... 11 Turning On or Off the Key-touch Tone .................... 11
Listening to the Radio .............................................. 12
Tuning in to a Station--Auto Search ....................... 12 Presetting Stations .................................................... 12 Tuning in to a Preset Station .................................... 12
Receiving FM Stations with RDS ............................ 13
Changing the RDS Information ............................... 13 Searching for Programs by PTY Codes (PTY Search) .............