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Important Safety Precautions
Prior to shipment
from
the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of
the countries in which
they are to be sold. However,
in order to maintain such compliance, it is equally important to implement the following
precautions when a set is being serviced
@ Precautions during Servicing
1.
Locations
requiring
special
caution
are
denoted
by labels and
inscriptions
on
the
cabinet,
chassis
and
certain
parts
of the
product.
When
performing
service. be sure to read and comply
with
these
and
other
cautionary
notices
appearing
in the opera-
ON and service manuals
2. Parts identified
by the
A
symbol and shaded (
) parts are
critical for safety
Replace only with specified part numbers
Note:
Parts
in this
category
also
include
those
specified
to
comply with X-ray emission standards for products using
cathode
ray
tubes
and
those
specified
for compliance
with
vanous
regulations
regarding
spurious
radiation
emission,
3. Fuse replacement caution notice
Caution
for continued
protection
against
fire hazard.
Replace only with same type and rated fuse(s) as specified.
. Use specified internal wiring.
Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
5.
Use
specified
insulating materials for hazardous
live parts.
Note
especially:
1} Insulation Tape
3) Spacers
5) Barrier
2} PVC tubing
4) Insulation sheets for transistors
6. When
replacing
AC
primary
side components
(transformers,
power
cords, noise blocking capacitors, etc.) wrap ends of wires
securely about the terminals before soldering
"its bo h*
7, Observe that wires do not contact heat producing parts (heat-
sinks, oxide Metal film resistors, fusible resistors, etc.)
8. Check that replaced wires do not contact sharp edged or pointed
parts
9. When
a power cord has been replaced, check that 10-15 kg of
force in any direction will not
loosen
it.
Power cord
Fig. 2
. Also check areas surrounding repaired locations
. Products using cathode ray tubes (CRTs)
In regard to such
products,
the cathode
ray tubes themselves,
the high voltage circuits, and related circuits are specified for
compliance with recognized codes pertaining to X-ray emission.
Consequently,
when
servicing these products,
replace the cath-
ode
ray
tubes
and
other
parts with
only
the
specified parts.
Under
no
circumstances
attempt
to
modify
these
circuits.
Unauthorized
modification
can increase
the high voltage value
and cause X-ray emission trom the cathode ray tube.
to
prevent
safety
hazards,
according to the following steps
12. Crimp type wire connector
In such
cases
as when
replacing
the power
transformer
in sets
where
the
connections
between
the
power
cord
and
power
wansformer
primary
lead
wires
are
performed
using crimp
type
connectors,
if repiacing
the connectors
is unavoidable,
in order
perform
carefully
and
precisely
1) Connector part number : £03830-001
2) Required
tool . Connector
crimping tool of the proper type
which will not damage insulated parts
3) Replacement procedure
(1) Remove
the old connector
by cutting the wires at 8 point
close to the connector
Important : Do not reuse a cOnnector
(discard it).
524
\lz
S
ho.
10 connector
Fig. 3
(2) Strip about
15 mm
of the insulation from the ends of the
wires. tf the wires are stranded, twist the strands to avoid
frayed conductors.
15 mm
2
Fig. 4
(3) Align the lengths of the wires to be connected.
Insert the
wires fully into the connector
Metal
sleeve
Connector
Fig.S
(4) As shown
in Fig. 6, use the crimping tool to crimp the
metal
Sleeve at the center
position. Be sure to crimp fully
to the complete closure of the tool.
eS
hey
Cr
20
3
Fig. 6
(5) Check the four points noted in
Not easily pulled free
Wire insulation recessed
more than 4 mm
Fig. 7
imping tool
Fig. 7.
Crimped at approx. center
of metal sleeve
Conductors extended
SECTION 1
DISASSEMBLY
1.4 DISASSEMBLY FLOW CHART
This flowchart lists shows the disassembly steps for the
cabinet parts and P.C. boards in order to gain access to
item(s) to be serviced. When reassembling. perform the
step(s) in reverse order. Bend,route and dress the flat cables
as they were originally.
@
Top cover
¢
Bottom cover
[= 28
J
[Front panel assembly 7
© ©
®
SW/JACK & SW/DISPLAY board assemblies]
1.3 DISASSEMBLY/ASSEMBLY METHOD
PART NAME
TOP COVER
5(St)
—}-
@ | BOTTOM COVER
O2 | (S2}, 7(L1}
©)
FRONT PANEL ASSEMBLY|
D3 | 7121, °JOG/SHUTTLE [NOTE1>
(J636MS)
eeeremeees bec
ao
SW/JACK
& SW/DISPLAY|
D4 1 12(L3),°CN1201
|<NOTE2>
BOARD ASSEMBLIES i
*CN1204
©) | CASSETTE HOUSING | D5 | 2(S3) ,2(S4)
ASSEMBLY
Cassette housing assembly |
ey
Shield case
© © ®@
DRUM assembly
>)
Main deck assembly
@
1.2 HOW TO READ THE DISASSEMBLY AND ASSEMBLY
Main board assembly
PART NAME
TOP COVER
BOTTOM COVER
{$2), 7{L1)
1
FRONT PANEL ASSEMBLY | D3 } 7(L2),*JOG/SHUTTLE | <NOTE 1>
(J636MS)
+
+
+
SW/JACK & SW/DISPLAY | D4 | 12(L3),°CN1201, | <NOTE 2>
®
®
®
BOARD ASSEMBLIES
*CN1204
®
©
+
CASSETTE HOUSING | DS j 2(S3),2(S4)
ASSEMBLY
;
4
am
SHIELD CASE
D6 } 2(S5),*CN1
a
(1)
(2)
{3}
(4)
(5)
(1) Order of steps in Procedure
When reassembling, perform the step(s) in the reverse
order. These numbers are also used as the identification
(location) NO. of parts Figures.
(2) Part name to be removed or installed.
(3) Fig.No. showing procedure or part location
(4) Indentification of part to be removed, unhooked, unlocked,
released, unpluged,unclamped
or unsoldered.
P =
Spring,
W = Washer, S = Screw, L = Locking tab, * = Unhook,unlock,
release, unplug or unsolder.
(5) Adjustment information for installation
+—
SHIELD CASE
06
+—
DRUM ASSEMBLY
D7 | 3(S6),WRI,
MAIN DECK ASSEMBLY
| D8 | 2(S7),.WR2
WR3,2(L4),°CN703
OI
MAIN BOARD ASSEMBLY | D9 | 2(S8)
<NOTE1>
When reattaching the front panel assembly, make sure that
the door opener (@) of the cassette housing assembly is low-
ered in position prior to the reinstallation.
<NOTE2>
When plugging the connector in, check that the flat wire is
inserted properly and fully.
<NOTE3>
When reattaching the cassette housing assembly, pay careful
attention to the switch lever not to make it touch the REC
switch knob of the REC SAFETY board assembly from the
upside.
;
(If the REC switch knob of the REC SAFETY board assembly
is damaged, cassette loading is impossible.)
<NOTE4>
When plugging the connector in, check that the flat wire is
inserted properly and fully.
<NOTE5>
* When removing the Main deck assembly only, unhook the
two spacers connecting it with the Main board assembly
with pliers from the back side of the Main board assembly
first, and then remove the Main deck assembly.
« When reattaching the Main deck assembly to the Main
board assembly, make sure to set the spacers into the
retaining slots respectively.
11
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