JVC GR-DVM90U, Service Manual

Page: 18 / 105

2-1
A
Cassette housing assembly T Fig. 2-2-12 3(S1),(L1a)-(L1d) 1a, 1b, 1c, 1d Adjustment
2a
Reel disk (SUP) assembly T Fig. 2-2-13 (W2) 2a, 2b
2b
Reel disk (TU) assembly T Fig. 2-2-13 (W2) 2a, 2b
2c
Reel cover assembly T Fig. 2-2-13 (S2b),2(S2a),(W2) 2d
3a
Tension arm assembly T Fig. 2-2-14 (W3a) 3b
SECTION 2
MECHANISM ADJUSTMENT
2.1 PRELIMINARY REMARKS ON ADJUSTMENT AND
REPAIR
2.1.1 Precautions
1. When fastening parts, pay careful attention to the tightening
torque of each screw. Unless otherwise specified, tighten a
screw with the torque of 0.039 N·m (0.4 kgf·cm).
2. Be sure to disconnect the set from the power supply before
fastening and soldering parts.
3. When disconnecting/connecting wires, be careful not to get
them and their connectors damaged. (Refer to the Section 1.)
4. When replacing parts, be very careful neither to damage other
parts nor to fit wrong parts by mistake.
2.1.2 Notes on procedure for disassemby/assembly
The disassembling procedure table (Table 2-2-2 on page
2-5, a part of the table is shown below for reference) shows
the procedure to disassemble/reassemble mechanism parts.
Carefully read the following explanation before starting ac-
tual disassembling/reassembling work. The item numbers
(circled numbers) in the following explanation correspond to
those appearing under respective columns of the table.
(1)
Circled numbers appearing in this column indicate the
order to remove parts. When reassembling, follow these
numbers in the reverse order. Circled numbers in this
column correspond to those appearing in drawings of
this section.
(2) This column shows part names corresponding to circled
numbers in the left column.
(3) The symbol (T or B) appearing in this column shows the
side which the objective part is mounted on.
T = the upper side, B = the lower side
(4) Symbols appearing in this column indicate drawing
numbers.
Step
Part Name
Fig.
Point
Note Remarks
(1) (2) (3) (4) (5) (6) (7)
5
5
5
5
5 5 5
(5) This column indicates parts and points such as screws,
washers, springs, and others to be removed/fitted for
disassembling/reassembling the mechanism. Besides
such the parts, this column occasionally indicates
working points.
P =
Spring
W = Washer
S = Screw
* = Lock (L), soldering (SD), shield, connector (CN),
etc.
Example • Remove (W1) = Washer W1.
• * Remove the solder at (SD1) = Point SD1.
• * Disconnect
A = Connector A .
(6) Numbers in this column represent the numbers of notes
in the text. For example, “1” means “Note 1”.
(For parts that need phase adjustment after reassem-
bling, refer to “2.2.7 Check and adjustment of mechanism
phase”.)
(7) This column indicates required after-disassembling/-
reassembling work such as phase adjustment or
mechanism adjustment.