Removing The Major Parts; How To Read The Procedure Table; Disassembly/Assembly Method - JVC HR-J691U Service Manual

1.2 Removing the major parts

1.2.1

How to read the procedure table

This table shows the steps for disassembly of the externally
furnished parts and board assemblies. Reverse these steps
when re-assembling them.
<Example>
Step/ Fig.
Part Name
No.
Loc No.
[1] Top cover, 1-3a 4(S1a),(S1b),3(L1a),
Bracket
(1) (2) (3)
(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) Identification of part to be removed, unhooked, unlocked,
released, unplugged, unclamped or unsoldered.
P= Spring, W= Washer, S= Screw, L= Locking tab, SD= Solder,
CN**(WR**)= Remove the wire (WR**) from the connector (CN**).
Note:
• The bracketed ( ) WR of the connector symbol are as-
signed nos. in priority order and do not correspond to
those on the spare parts list.
(5) Adjustment information for installation

1.2.2 Disassembly/assembly method

Step/ Fig.
Part Name
Loc No. No.
[1] Top cover 1-2-2d 3(S1a)
[2] Front panel assembly 1-2-2d 2(S2a), 4(L2a), 3(L2b)
1-2-2a
[3] Mechanism assembly 1-2-2d CN2001(WR3a),
(Drum Shield)
(Drum assembly) 1-2-2b CN1(WR3b),
1-2-2c (S3c), (S3d), (S3e)
[4] Main board assembly 1-2-2d 2(L4a), (L4b), (L4c)
<Note 2a>
• When reattaching the Front panel assembly, make sure that
the door opener of the Side frame (R) is lowered in position
prior to the reinstallation.
• When reattaching the Front panel assembly, pay careful atten-
tion to the switch lever of the Front panel assembly not to make
it touch the switch knob of the Main board assembly from the
side.
• When reattaching the Front panel assembly, lift the Cassette
door slightly.
1-2
Point Note
<Note 1a>
2(SD1a),(P1a),(W1a),
CN1(WR1a),
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2(S1c)
(4) (5)
Point Note
<Note 2a>
<Note 3a>
(S3a), (S3b) <Note 3b>
- - - - - - - - - - - - - - - - - - - - - - - - - -
<Note 3c>
(S3f), (L3a)
- - - - - - - - - - - - - - - - - - - - - - - - - - - <Note 3d>
Door
opener
Side
frame(R)
Fig. 1-2-2a
<Note 3a>
• Be careful not to damage the connector and wire etc. during
connection and disconnection.
• When connecting the flat wire to the connector, be careful with
the flat wire direction.
<Note 3b>
• When reattaching the Mechanism assembly, secure the screws
(S3a to S3b) in the order of a, b.
<Note 3c>
• When reattaching the Mechanism assembly, be sure to align
the phase of the Rotary encoder on the Main board assembly.
• When reattaching the Mechanism assembly, set the "Mecha-
nism assembly mode" (See "Mechanism disassembly/assem-
bly").
• When reattaching the Mechanism assembly to the Main board
assembly, take care not to damage the sensors and switch on
the Main board assembly.
<Note 3d>
• When reattaching the Drum assembly, secure the screws (S3c
to S3e) in the order of c, d, e.
(S3c)
(S3d)
(S3e)
<Note 3c>
Fig. 1-2-2b
• When handling the drum assembly alone, hold it by the motor
or shaft. Be careful not to touch other parts, especially the video
heads. Also take care not to damage the connectors.
Motor
Video heads
Fig. 1-2-2c
Switch
lever
Switch
knob
(S3e)
(S3d)
HOOK
(S3c)
<NOTE>
Attach the Drum assembly appropriately,
since the installation state of the Drum assembly
influences the FM WAVEFORM LINEARITY
greatly.
Shaft