Jvc PCXT 5 Service Manual

Page 1

Area suffix

@EE 2':

Contents

.. U.K.
.. Continental Europe

Page
I Safety Precautions ........................ 2
I Specifications .............. 4
I Instructions (Extraction) 5
m Location of Main Parts .................................... 15
E Removal of Main Parts/Exploded Wow and Parts List
Receiver Section ........ 17
Speaker Box Section . 23
CD Mechanism Section . 24
Cassette Mechanism Section .. .. 25

[S Main Adjustments
Tuner Section ......... 26
Cassette Section 29
CD Section .................................................... 32

1. Portable system incorporating a multi-tunctlon
Twin-CD player.
0 Twin-CD player with programmable play of up to 20
tunes/repeat play/random playfintro play functions.
. scm (3-3/16') '00 singles' capability.
2. MW/LWIFM-stereo PLL synthesizer tuner.
O ZO-station preset tuning (FM-10, MW-5. LW-S).
0 Seek Manual tuning.
3. The CD and tuner functions can be operated from
the remote control unit.
4 Synchro-record start tor CD recording
convenience.
5. Double-comm mechanism (Deck A tor recording
and playback, Deck B tor playback).
I Dolby 3 Noise Reduction System.
0 Metal and Cr02 tape can be played W, tor superior
tone quality.
OSynchro start dubbing function (normal/high-speed
dubbing).
0 Relay playback (irom Deck B to Deck A).
0 Full autosiop mechanism.
5. Hyper-Bass sound system with SD super woofer.

' Doby noise reduction manufactured under license trorn Dolby
Laboratories licensing Corporation. 'Dolcy' and the double-D
symbol [1] are trademarks of Dolby Laboratories Licensing
Corporation.

Page

El Block Diagram .
LEI Standard Schematic Diagram and
Location of P.C. Board
Tuner/DTS
Power Amplifier
Pre Amplifier
CD Control
CD Amplifier
Function ......
[E Wiring Connections ..
P.C. Board Parts List
Packing and Parts List .

No. 1843
September 1991

Page 2

PC-XT5 B/E

I Safety Precautions

l. The 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. Service 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 manufacturer or responsibility for personal injury or property damage resulting therefrom.

3. Many electrical and mechanical parts in the product 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 (A) on the schematic diagram and Parts List in Service Manual. The use
of a substitute replacement which does not have the same safety characteristics as the recommended replace-
ment part shown in the Parts List in 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~assemb|ing 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 pro»

duct 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 part 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 0.5 mA AC (r.m.s.l.

0 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 Ii 10 W resistor paralleled by a 0.15 uF AC-type capacitor
between an exposed metal part and a known good earth ground.

. . AC V LTMETER
Measure the AC voltage across the reSIstor With the AC @ (Haws; 1°00 ohms/volt
voltmeter. or more sensitivity.)

Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and Place this probe
repeat each measurement. Any voltage measured must w on each exposed
not exceed 0.75 V AC (r.m.s.l. 1500 n 10 w metal part.

This corresponds to 0.5 mA AC (r.m.s.l.

O.l5 [IF AC TYPE

Good earth ground

Warning

. This equipment has been designed and manufactured to meet international safety standards.

. It is the legal responsibility of the repairer to ensure that these safety standards are mainteined.
. Repairs must be made in accordance with the relevant safety standards.

. It is essential that safety critical components are replaced by approved parts.

. lf mains voltage selector is provided, check setting for local voltage.

(noun-

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