Jvc UXD 66 Service Manual

Page 1

Contents

I Safety Precautions -----------------------
I Safety Precautlon about PUX 7 D66
I Instructions ................................
m Loaation of Mam Parts ......................................... 35
Removal of Maln Parts ........................................ 40
[S Traubleshootlng
E J|g list ..............
[31 Main Adjustments ....................................
Wiring Connecflons ............................................. 54
m Block Diagram ................................................ 66
Standard Schematic Diagram
ITuner circuit -
I CD amplifier/mechanism dralve clrcu

I Cassette amplifier vlrcult ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 73
I Power ampllller clrcult ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, 74
ISystem control circuit ------------------------------------ 75

WEE

DIGITAL AUDIO
Area Suffix

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

E -------------------- Continental Europe

G .................................. Germany

Q] ........................................ ltaly

EN .......................... North Europe
I Function clrcult ........................................... 75

[3 Location of P.C. Board Parts and Parts list

I Microprocessor/function board ------------------- 77
I Key switch board ------------------------------------------- 82
IMaln board ................................................... 84

I Preamplifier board
I CD amplifier board

.Tuner board ..........

ICassette mechanism board --------------------------- 96
Exploded View of Enclosure Component Parts

.cD/Tuner section ........................................... 97

I Deck and amplifier/power supply section ------ 100
E]. Exploded View of Mechanism Component Parts

I Cassette mechanlsm sectlon ------------------------ 103

I CD mechanism section ------------------------------ 104
Illustration of Packing and Parts List ---------------- 104

No. 1945
September 1995

7 D66 B/E/EN/G/Gl

Page 2

UX - 066 B/E/EN/G/Gl

1. Safety Precautions

. The design 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 manufactures 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 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 pans list of service manual. Electrical components having such features are identified by shading(E:l) and (A)
on the schematic diagram and parts list in the service manual. The use of a substitute replacement which does not have the same
safety characteristics as the recommended replacement part 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. mpving 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 reassembling.

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

AC V0 LTMETE R
transformer during this check. m (Having 1000 ohms/volt.

- Plug the AC line cord directly into the AC outlet. using a"Leakage 0' more nmwny,

,
current tester". measure the leakage current from each exposed fl
metal art of the c binet articula an ex osed etal art 0.15pFACTYPE
P a r P Y Y P 'T' P
having a return path to the chassis. to a known good earth ground. pm, this probe
on each exposed
Any leakage current must not exposeed 0.5mA AC(r.m.s.) 1500 n 10 w mew pa".

~ Alternate check method

Plug the AC line cord directly into the AC outlet. Use an AC 600d earth ground
voltmeter having 1.000 ohms per volt or more sensitivity in the following manner. Connect a 1.500 ohms 10W resistor paralleled
by a 0.15 ,u F AC type capacitor between an exposed metal part and a known good earth ground, Measure the AC voltage
across the resistor with the AC voltmeter. 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 repeat each measurement, Any voltage measured must not exceed 0.75V AC(r,m.s.).This corresponds to 0.5mA

AC(r.m.s.).

Warning (UK om)

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 maintaintaind.
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.

2 (No.1945)

Page 21

UX - D66 B/E/EN/G/GI

Repeat play (using the remote control unit)

Press the REPEAT button while pressing the SHIFT button
betore or during play. A single track or all the tracks can be
repeated.

Whether a single track or all tracks are to be repeated can
be specified. Each time the REPEAT button is pressed
while pressing the SHIFT button, the mode will change
Irom a single track (<2), to all the tracks (C ALL), to the
clear mode, in this order,

Goes oil

<: ii> CALL Ci)

Still"r Single track All tracks

Repeat playback is released.
EPEAT
t I

0 Single track repeat (6)
The track being played will play repeatedly.

o All track repeat (r: ALL)
All tracks or the programmed tracks of a CD will play
repeatedly.

Random play (using the remote control unit)

Press the RANDOM button while pressing the SHIFT
button, and all tracks on a CD play once in random order.

HANDLING CASSETTE TAPES

Cassette tapes Cassette loading

i. Loose tape may cause trouble, Using a pencil or like 1. Press the EJECT button to open the cassette holder,
object, gently tighten the tape as shown. 2. Load a cassette as shown.

2. To prevent recordings from being erased accidentally, 3. Close the cassette holder by pressing it gently. Listen
remove the tab(s) with a screwdriver, etc. Reseal the lor the click indicating that the holder is securely shut,

slots with adhesive tape to erase and re-record alter the
tabs have been removed.

3 6-120 cassettes are not recommended because they
are prone to malfunction.

Side "A"

Tab "B" Side is" Tab "A

Adhesive tape

(No. 1945) 21

Page 46

UX - 066 B/E/EN/G/Gl

lHow to disassemble the

mechanism

cassette

6 Head mount assembly (See Figure 2- 27)
1. Remove the three head mount assembly mounting screws
Q).
2. Remove the head wire holder from the chassis.
*After replacing the head mount, adiust the angle of the
head.
0 How to engage the gear section of the direction lever
with the head mount gear during assembly is illustrated
on the right.

QPinch roller assembly (See Figure 2-28)

Right

1. After opening the pinch roller assembly retaining tab ®

outwards, pull out the pinch roller assembly.

0 When assembling, the studs, located under the pinch
roller, must be inserted between the direction lever and
pinch roller spring.

Left

1. Perform the same procedure for the right as shown

above.

OCapstan motor and flywheel assembly
(See Figures 2~29 to 2- 31)

1. Flemove the three FM bracket assembly mounting screws
®.

2. Open outwards and remove the two FM bracket retaining
tabs (B).

3. The capstan belt. flywheel and other related parts can be
removed with the FM bracket pulled up slightly. Since, at
this time, the reel belt between the flywheel and main
pulley will be hooked on the FM bracket, remove the belt
using a tool which will not damage the belt. If the flywheel
is hooked on the FM bracket, remove them together as
they are.

46 (No.1945)

Cassette mechanism top view

e

Head mount assy

=7 L
D' a. | ' Head base Directionlever Head base
Ire IO" ever
[I d m .- [F d
r filliumlu_ -fi

Left is wider--
When the gear section is located
within the lelt halt viewed at the
central axis.the spring at the head
mount must be located within the
right hall as shown above.

--.1 .- Right is wider
When the gear section is located
within the right half viewed at the
central axis.the spring oi the head
mount must be locade within the

left half as shown above.

Pinch roller section FIG 2 - 27

Pinch roller ass'y

When asse ling,
the stud must be
inserted into the
direction lever.

Fig. 2 - 28

Cassette mechanism top view

FWD/REV anti gear ass'y

Fig. 2 - 29