Jvc XVSA 70 BK Service Manual

Page 1

XV-SA70B K/XV-SA7ZSL

SERVICE MANUAL

DVD AUDIONIDEO PLAYER

XV-SA7OBK / XV-SA7ZSL

Area Suffix
(XV-SA7OBK)

EN ---- Northern Europe
UJ ----------- USA Military
Area Suffix
(XV-SA7ZSL)

B -------------------------- U.K.

E -»- Continental Europe
EN ---- Northern Europe
EE - Russian Federation
US ------------- Singapore

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M W I" V" v "n UW -» Brazil,Mexico,Peru
(For only Asia)
) ........ E,
.2. mm a"; aim
(This illustration is version EN)
Each difference point
Model Body color
XV-SA70BK Black
XV-SA728L Silver
Contents
Safety precautions ------------------------ 1-2 Disassembly method .................... 1-6
Preventing static electricity ------------- 1-3 Adjustment method ...................... 1-15
Precautions for service ------------------ 1-4 Troubleshooting .......................... 1-19
important for laser products ------------ 1-5 Description of major le ................ 1-23

Glossary of term and abbreviations -- 1-44

This service manual is printed on 100% recycled paper.
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

No.A0022
Oct. 2001

Page 2

XV-SA7OBK/XV-SA728L

-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 current 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 measure 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)

Page 42

XV-SA7OBK/XV-SA728L

I SST39VF160-7CEK (IC509) : 16M EEPROM

1. Pin layout
A15: 1 O 48 :1 A16
A14l: 2 47 :1 IBYTE
A13: 3 46 :I Vss
A12: 4 45 : D15
A11': 5 44 :' D7
A10: 6 4a :' D14
AQE 7 42 E D6
A8 a 41 D13
A19:: 9 40 % D5
Nc.:1o 39 :1 D12
NVE:11 33 :1 D4
IRST:12 37 :. VDD
NC|:13 36 :1 D11
NC:14 35 :1 D3
RIB:15 34 :1 D10
A1sl:16 33 :1 D2
A17:17 32 :1 D9
A7E1s 31 :I D1
A6:19 30 :| DB
A5|:20 29 :' D0
A4I:21 2a :' IOE
A3|:22 27 E Vss
A2|:23 2e :1 /CE
A1 :24 25 :1 A0

2. Block diagram

16,777,216Bit
X-Decoder EEPROM

Cell Array

A19~A0 <-> Address Buffer & Latches

i

Y-Decoder

/CE ->

i

/OE 4» Control Logic l/O Buffers & Data Latches
/\NE 4> i
DQ15~DQO
3. Pin function
Symbol Pin name Description

A19~A0 Address Inputs

To provide memory addresses. During sector erase A19~A11 address
lines will select the sector. During block erase A19~A15 address lines
will select the block.

DQ15~DQO Data Input/Output

To output data during read cycles and receive input data during write
cycles. Data is internally latched during a write cycle. The outputs are
in tri-state when /OE or/CE is high.

/CE Chip Enable To activate the device when /CE is low.
/OE Output Enable To gate the data output buffers.

/WE Write Enable To control the write operations.

VDD Power Supply To provide 3-volt supply ( 2.7V-3.6V ).
Vss Ground

NC No Connection

1 -42