Technics SU-VX720 - Wiring Connection Diagram; Main and Support PCB Wiring; Power and Control Circuit Wiring; Measurements and Adjustments

SU-VX720 SU-VX720 |
m@ MEASUREMENTS AND ADJUSTMENTS
e ADJUSTMENT
@ WIRING CONNECTION DIAGRAM
TAPE2/DAT TAPE!) [Aux] [TUNER REMOTE
SPEAKERS CREC(OUT)) (REC(OUT)) CONTROL
Lech
Rech
CPLAY11IN))
CPLAYIIN))
[col
OUT
ili!
LN
Hill
{IH}
=
=
=
=
Lad
=
Cs
m
Eq vain P.C.B.
CPIOS
CN702A CN702B
REMOTE
SENSOR
HH OPERATION P.C.B.
cr9soa CP6O0! CP202 CNIO!
W501 10) (EEEEEET:) fi. 6)
—— CN6Ot CN202
fa. 13| :
SWITCH
Z701 {CAPACITOR BLOCK} MMmAC IN/VOLT ADJ. P. C.B
($2)
[
SOLDER SIDE
ST
SELECTOR
PC: 8.
WHT/ BLU
WMT/6BLK
WHT/ REO
WHT/BRN WHT / BRN
WHT /ORG
x 3 POWER
a t*]
~ : SWITCH P.C.B.
x = =
= i = =
SOLDER SIDE
Ti ( Power |
transformer } |
SOLDER SIDE.
(w3) (wa) (w2) WHT /ORG
WHT /@L«
WHT/8LY
- 25 —
Control positions and equipment used
eVolume knob .......... 0c. cc eee cee ee eens oc (Minimum) ®DC electronic voltmeter (EVM)
@ Speaker SElOCIOR: -ng.03 ects FCheada es bee
e VOLTAGE CONTROL (V) AMP. IDLING (ICQ)
ADJUSTMENT
1. Test equipment connection is shown in figure. (Connect the DC
EVM on both channels.)
2. Completely turn the (V) amp. adjusting volumes (VR451, VR452)
counter-clockwise.
3. Turn on the set when it is cold, and about 8 sec. later, adjust
VR451 and VR452 so that the voitage is 100+10 mV.
TP451(V-amp )
eADJUSTMENT POINTS
ENN ANN
08
TP451 |
VR451 YE } O}
V-Amop) (L-ch)
P /’ py VR452
he
es
f.
9
—"
a
—- 26-
foe
eee ee
Pye or re 7
iITP451(V-amp.)
a aan cerra &