Technics SU-V4 Service Manual

| su-v4_ |
2. Adjustment of FL power meter
* Conditions of the set, and equipment used
1.
2.
3.
4,
2-1.
1)
2)
3)
4
2-2.
1)
2)
3)
A)
5)
Input selector... ....... tuner 5. Low frequency oscillator
Speaker switch ....... .main 6. AC electronic voltmeter
Meter range switch. .....X1 7. 8-ohm load resistor
Sound volume. ....... .10 (max.) a
Adjustment of 0.1W 7
Connect the low frequency oscillator to the tuner terminals for both channels, and the AC electronic voltmeter to
the speaker terminals in parallel with the load resistor.
Set the meter range switch to ‘’X1” position. ,
Add 1kHz signal. from the low frequency oscillator, and ener the input level SO that the AC electronic voltmeter
indicates 1.5V.
Adjust R730 while observing the FL peak power meter until the first segment is about to turn on (Refer to Fig. 7)
Adjustment of 10.25W
Set the meter range switch to oe had position:
Regulate the input level so that the AC electronic volimeter indicates OV.
Make the adjustment in the same way as mentioned in 2-1 by regulating R731 so that the 11th segment to turn on.
(Each segment consists of three bars)
Next, make the adjustment in 2-1(0.1W) by regulating the input evel.
Again regulate the input level to make the output 9V, and make sure that the segment at 10.25W (Refer to Fig. 8)
position is on.
(left)
(right)
[Fig. 7] (Abb. 1)
: ct 23 33 eS ce ca Eanes ae rita 121 e134) 144 1154 6) r17
PAREREL (LUG 0000000000000
10 * 20 3040100
HUEGNUREA 000000 000008000000
[Fig. 8] (Abb. 2)
rSpeakers terminal
de i
ar
Ma ee
rowel aC) Om
transfor-
Beak On
Clamp volt.
| R338 — ‘Adjustment
(R:. ch.) ° |
ica Adjustment
4 (R.ch.)
Clamp voit. |
Rect Adjustment
(bL.ch.)
Ica Adjustment
(L.ch.)
Front panel |
Peak hold power Peak hold power
meter Adj. meter Adj.

Technics SU-V4 Specifications

General

Brand	Technics
Model	SU-V4
Category	Amplifier
Language	English