Technics SU-V4 Service Manual

SU-V4
e How to remove the front panel and the bottom board
1. Remove the 4 setscrews (Fig. 3 : dQ) ~ 3) holding the front panel.
2. Pull the front panel outward from the front of the unit. (Fig. 3:®@)
3. To remove the bottom board, remove the 7 setscrews (Fig. 4: (4 ~@Q) holding the bottom board.
[Fig. 3] | | a [Fig. 4]
e How to remove the power IC
1. Remove the cabinet and bottom board. (Refer to the sections ‘‘How to remove the cabinet” and ‘‘How to remove the
front
panel
and
the
bottom
board”’.)
|
2. Remove the solder of power IC for both L ch and R ch. ae G | =
3. Remove the 4 setscrews (Fig. 5 : @l)~@)) at the bottom of the heat sink and then remove the heat sink along with the
power IC in the direction of the i .
arrow ® . (Refer to Fig. 6)
4, Remove the 2 setscrews (Fig. 6 :
25), 26) used to secure the power
IC on the heat sink and then pull
the power !C. | :
5. When mounting the power IC,
apply silicone compound (or
equivalent heat diffuser) to the
back of power {C, and _ then
follow the steps 1 ~ 4 reversely.
_ Rear panel
Heat sink
Power IC Power IC
bracket
a mek _ [Fig. 6]
@
ADJUSTING
INSTRUCTIONS
sees
ENGLISH
om
®
Setting
of
controls
and
instruments
to
be
used
—
-
_
a
1. Speaker switch ....... main 3. DC voltmeter (capable to measure 5mV)
2. Sound volume. .......0 (minimum) | :
|
L
channel
-
|
*
Turn
Ica
sémi-fixed
resistors
R367, 368 to minimum. (counter-
clockwise direction}
- * Adjust R337 (L ch) and R338
(R ch) to approx.
~0.5m¥V after ten minutes warm-up
time. -
Between and pees R337 (L channel)
(minus probe)
R channel
Between §ygieyg and
(minus probe)
Clamp Voltage
R338 (R channel)
L channel
Between Bemsienm and Basco:
(minus probe)
R channel
Between Mamse¥A and Bmscer!
(minus probe)
* Adjust R367 (L ch) and R36
(R ch) to approx. |
15.5mV after ten minutes »
warm-up time.
R367 (L channet)
Ica
(Adjustment using
a DC voltmeter)
R368 (R channel)

Technics SU-V4 Specifications

General

Brand	Technics
Model	SU-V4
Category	Amplifier
Language	English