Jvc UXP 4 R Service Manual

Page 1

UX-P4R

JVB

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-P4R

SP-UXP4 CA-UXP4R SP-UXP4
Area Suffix
@figffi E Continental Europe
EN ------ Northern Euro e
DIGITAL AUDIO @ 8,9,5, p
Contents
Safety precautions ----------------- 12 Maintenance of laser pickup ............ 1.19
Preventing static electricity ------------- 1-4 Replacement of laser pickup - 1-1 9
Important for laser products ------------ 1-6 Description of major [Cs ................. 1.20
Disassembly method --------------------- 1-7 Internal connection of display .......... 1.39
Main adjustment .......................... 1-14
Flow of functional operation
until TOC read (CD) ------- 1-18

No.20975

COPYRIGHT {Q 2001 VICTOR COMPANY OF JAPAN, LTD.
Jun. 2001

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UX-P4R

-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.

. 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.

. 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 (fi) 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.

. 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.

. 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.).

C 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 Q 10W resistor paralleled by a 0.1511 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 (HavingiOOO
voltmeter. ohms/volts,

Move the resistor connection to eachexposed metal part, 00'9 sens'UV'W)

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

0.1511 F AC TYPE

Now, reverse the plug in the AC outlet and repeat each -"_ Placethis
measurement.IVoltage measured any must not exceed 0.75 V W , Zéitfieeiflosed
AC (r.m.s.).ThIs corresponds to 0.5 mA AC (r.m.s.). 15009 10w metal pm

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. chassis. Therefore, pay attention to
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.

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 "A"
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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UX-P4R

lRemoving the display board / switch F'°"Pa"e'assemb'y

board (See Fig.20 to 22)

- Prior to performing the following procedure, remove
the front panel assembly.

1. Pull out the VOLUME knob on the front panel. VOLUME knob

2. Remove the fifteen screws M attaching the display
board and the switch board on the back ofthe front
panel. Remove the display board with the switch
board.

3. Remove the screw N attaching the switch board to
the LCD holder.

4. If necessary, unsolder the wire extending from
connector FW931 on the display board and FW931
on the switch board.

5. If necessary, remove the band bundling the wires , Display board
extending from the headphone board and the display
board.

M

Switch board
Fig.21

Display board

FW931 N Switch board

Fig.22

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UX-P4R

3. Descriptions

1 -36

Pin name Pin No. Descriptions

L1 18

L2 17

L3 16

L4 15

L5 14

R1 20 Input signal pin

R2 21

R3 22

R4 23

R5 24

LSELO 13 Input selector output pin.

RSELO 25

LBASS1 10

LBASSZ 9

RBASS1 28 Capacitor and resistor connection pins comprising filters for
RBASS2 29 bass and super-bass band.

L88 8

R88 30

LOUT 7 ATT + equalizer output pin/capacitor connection pin
ROUT 31 comprising filter for super-bass

LVRIN 12 Volume input pin

RVRIN 26

3'2: 12; Capacitor connection pin comprising treble band filter.