Jvc MXDVA 9 R Service Manual

Page 2

MX- DVA9/MX-DVA9R

-Safety Precautions

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 manufacturers 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 (/t\,) 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.

0 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 Q10W resistor paralleled by a 0.1 51.1 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 a (Having1000
voltmeter. ohms/volts,

Move the resistor connection to each exposed metal part, c more sens'W'W)

particularly any exposed metal part having a return path to
the chassis, and meausre the AC voltage across the resistor. 0'15: AC TYPE

Now, reverse the plug in the AC outlet and repeat each -"| Placehis
measurement.IVoltage measured any must not exceed 0.75 V W . ~ ggiieeigosed
AC (r.m.s.). This corresponds to 0.5 mA AC (r.m.s.). 15009 10W metal part.
Good earth ground
- Warning A CAUTION
1.This equipment has been designed and manufactured to meet international safety standards. Burrs formed during molding may

2. it is the legal responsibility of the repairer to ensure that these safety standards are maintained. be left over on some parts of the
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. such burrs in the case of

5. If mains voltage selector is provided, check setting for local voltage. preforming repair of this system.

chassis. Therefore, pay attention to

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 (h) and ICP (Q) or identified by the (N
mark nearby are critical for safety.

When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.
(Except the J and C version)

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Page 14

MX-

I Removing the power transformer assembly

DVA9/MX-DVA9R

(See Fig.28 and 29)

- Prior to performing the following procedure, remove

the metal cover, the DVD changer mechanism
assembly and the rear panel.

.Disconnect the wire from connector CN218 and

CN219(only US/UJ/UG/UN/UW) on the power board.

. Remove the two wire clamps on the power amplifier

board (1) and power board.

. Disconnect the wire from connector CN204 on the

regulator board.

. Disconnect the wire from connector CN220 on the

transformer board.

. Remove the four screws L attaching the power

transformer assembly.

I Removing the regulator board

(See Fig.30)

' Prior to performing the following procedure, remove

2.

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the metal cover, the DVD changer mechanism
assembly, the rear panel, the antenna board, the
main board, the analog output board, the power
board, the power amplifier board (1), the power
amplifier board (2) and the speaker board.

. Disconnect the wire from connector CN204 on the

regulator board.

Remove the two screws M.

Power boa

Power transformer assembly

Transformer board

Wire clamps CN220

CN218 /'

Regulator board
CN204

Power transformer assembly
Fig.28

Wire clamp

4 Regulator board
CN204

L
Fig.29

Regulator board

Power transformer assembly

Fig.30

Page 29

I DVD section

TEST MODE FOR DVD a INITIALISE THE DVD UNIT BOARD
a) Insert A/C Power Cord

b) At standby mode press Stop Button and CANCEL/DEMO button.

Wait 4 seconds & for the display of " TEST VERSION REGION " i.e. TEST JC 1

c) Press the 'ENTER' button on remocon. The FL panel will display 'EEPROM'.
Plug out and plug in again the power cord. Repeat the process 1(a) and 1(b) again.
Confirm that the Area Code and Region Code is correctly display as below.

MX- DVA9/ M X- DVA9Fl

Are Code FL indicate of Area Code in Test mode Region Code.
J/C JC 1
UJ JC 1
UG/UX 2U 2
USIUN/UP 3U 3
UT UT 3
UW 4U 4
E/EN/B E 2
A A 4
EE EE 5

Note: Please plug out and plug in the power cord from NC supply before continue the next test.

Adjustment

Jig setup

1. Remove the rubber cushion from each of the four
corners of the traverse mechanism.
(When installing be sure not to make a mistake with
the cushion colors).

2. Install the jig stud.

3. Make a jig clamp. (Remove the clamp from the set
and assemble it as shown in the diagram below.

Note:
How to handle the pickup
To protect the pickup from electro-static damage,
make sure to hold it by the die-cast chassis (optical
base). And make sure that pickup lens do not touch
the top cover.

How to prepare a clamp

Remove the claws

from the 3 locations

Green rubber
cushion

Blue rubber
Xgfl cushion

E . - - . g
Blue rubber
cushion

Installing the
4 jig studs

Combine the clamp
and holder to become
a jig clamp.
Disassemge the clamp
and holder

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Page 46

MX- DVA9/MX-DVA9R

2.Pin function (2/5)

Pin No. Symbol [/0 Description
37 V88 - Connect to ground
38 NC - Non connect
39 NC - Non connect
40 NC » Non connect
41 NC - Non connect
42 NC - Non connect
43 PIOO I/O Programmable l/O terminal
44 V88 - Connect to ground
45 VDD - Power supply terminal 3.3V
46 P|O1 l/O Programmable l/O terminal
47 P|02 l/O Programmable l/O terminal
48 P|03 l/O Programmable l/O terminal
49 P|O4 l/O Programmable l/O terminal
50 FIGS |/O Programmable l/O terminal
51 PIOG l/O Programmable l/O terminal
52 PIO7 l/O Programmable l/O terminal
53 MDATAO l/O SDRAM data
54 MDATA1 l/O SDRAM data
55 VDD - Power supply terminal 3.3V
56 V88 - Connect to ground
57 MDATA2 I/O SDRAM data
58 MDATA3 l/O SDRAM data
59 MDATA4 l/O SDRAM data
60 MDATAS l/O SDRAM data
61 MDATAG l/O SDRAM data
62 MDATA7 l/O SDRAM data
63 MDATA15 l/O SDRAM data
64 VDD - Power supply terminal 3.3V
65 V88 - Connect to ground
66 MDATA14 l/O SDRAM data
67 VDD - Power supply terminal 2.5
68 V88 - Connect to ground
69 MDATA13 l/O SDRAM data
70 MDATA12 l/O SDRAM data
71 MDATA11 l/O SDRAM data
72 MDATA10 l/O SDRAM data
73 MDATAQ l/O SDRAM data
74 VDD - Power supply terminal 3.3V
75 V88 - Connect to ground
76 MDATAS l/O SDRAM data
77 LDQM O SDRAM Lower or upper mask
78 SD-CLK O SDRAM Clock
79 CLKSEL l Selects SYSCLK orVCLK as clock source. Normal operation is to tie HlGH.
80 MADDRQ O SDRAM address
81 MADDR8 O SDRAM address
82 VDD - Power supply terminal 3.3V
83 V88 » Connect to ground
84 MADDR7 O SDRAM address

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Page 54

MX- DVA9/MX-DVA9R

I AN7345K (IC302) : REC/PRE amp

1.Terminal layout & block diagram

REPPLE
FlEJ

2.Pin function

Pin No. l/O Function
1 l CH1 Playback amplifier input(1)
2 | CH1 Playback amplifier input(2)
3 | CH1 Playback amplifier negative feedback
4 0 CH1 Playback amplifier output
5 l CH1 Equalizer input
6 0 Pre amplifier input control time constant
7 | CH1 Receding amplifier input
8 | CH1 Receding amplifier negative output
9 0 CH1 Receding amplifier output
10 O ALC low cut
11 O ALC L.P.F
12 - Connect to GND
13 - Power supply
14 O Repple filter
15 l Equalizer control
16 0 CH2 Receding amplifier output
17 l CH2 Receding amplifier negative output
18 | CH2 Receding amplifier input
19 0 Pre amplifier input control
20 l CH2 Equalizer input
21 0 CH2 Playback amplifier output
22 | CH2 Playback amplifier negative feedback
23 l CH2 Playback amplifier input(2)
24 l CH2 Playback amplifier input(1)

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