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Service Position; How To Take Out The Mechanism And Main Board Assemblies - JVC HR-J271MS Service Manual

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1.4 SERVICE POSITION

In order to facilitate diagnosis and the repair of the Mecha-
nism assembly, this unit is constructed so as to allow the
Mechanism and Main board assemblies to be removed to-
gether from the Bottom chassis assembly.
1.4.1 How to take out the Mechanism and Main board
assemblies
(1) Remove the Top cover, Bracket, Front panel assembly,
and Mini ope (Mini front) board assembly. (See 1.3 DIS-
ASSEMBLY/ASSEMBLY METHOD.)
(2) Lower the cassette holder, and make the preparations re-
quired in order to remove the screws from the Mecha-
nism assembly. (Refer to the "Procedures for Lowering
the Cassette holder assembly" on page 1-2 of 1.3 DIS-
ASSEMBLY/ASSEMBLY METHOD.)
(3) Take out 2 screws A , 1 screw B , 1 screw C and 1
screw D as shown in Fig. 1-4-1.
D
Fig. 1-4-1
(4) Remove the Main board and Mechanism assemblies to-
gether while holding the edge of the Main board assem-
bly. At this stage be careful of the power cord and prongs
of the jacks on the back side. (See Fig. 1-4-2.)
Fig. 1-4-2
1-4
(5) Connect the power cord to the wall socket, and lift the
cassette holder.
(Before turning on the power make sure that there is noth-
ing which may produce a short circuit, such as faulty sol-
dering.)
(6) When performing a diagnosis or repair of the Main board
assembly with a cassette tape in place, turn on the power,
insert a cassette tape, and turn over the Main board and
Mechanism assemblies together.
Note:
• When carrying out diagnosis and repair of the Main
board assembly in the service position, be sure to
ground both the Main board and Mechanism assem-
blies.
If they are improperly grounded, there may be noise
on the playback picture or the FDP counter display may
move even when the mechanism is kept in an inopera-
tive status.
• When performing diagnostics of the tape playback or
recording condition in the "SERVICE POSITION", en-
ter the desired mode before turning the set upside
C
down, and do not change the mode during diagnos-
tics while the set is placed upside down. If you want
to switch the mode, turn the set to the normal posi-
tion.
Digitized in Heiloo Netherlands
MAIN BOARD ASSEMBLY
<03>
Fig. 1-4-3
1/21/2018

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