Technics SU-3 - Page 2

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STANDARD CONNECTION METHOD WITH DIRECT
S HECONNECTOR: cisco a Seta Aw Sale rece Bee ee Sle ea
PROTECTION CIRCUITRY ....... 0.002 eee nee cee 2
BEFORE REPAIR AND ADJUSTMENT....... ee ee ee
LOCATION OF CONTROLS .......0.0 20200 ee ee
DISASSEMBLY INSTRUCTIONS .........22 e220 eee 3,4
TERMINAL GUIDE OF TRANSISTORS, DIODES
ANDIC’S ......
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CIRCUIT BOARD AND WIRING CONNECTION |
DIAGRAM. <2 puck cats och cea dew wo ease tab 6
RESISTORS & CAPACITORS ........2000e0eeeeeee 7
BLOCK DIAGRAM ......... 200 ee ee ne nnn can vee se 89
CIRCUITS TO BE CHANGED AND THE AREAS ........10
SCHEMATIC DIAGRAM.......... ree eee ee 11 ~ 13
REPLACEMENT PARTS LIST........ ee ee ee 14
EXPLODED VIEW ..... Oe ae ee eee eee ee ~s 2» -15,.16
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STANDARD
CONNECTION
METHOD
WITH
DIRECT
CONNECTOR
@) Lift the direct connector on the
tape deck. Push it straight
down to lock it into place. clockwise 90°.)
After lifting
properly.
@) Remove the stabilizing pin
from the back panel. (Turn
counterclockwise 90° and
pull.)
~@®.
cords.
Mi
PROTECTION
CIRCUITRY
The protection circuitry may have operated if eigher of
the following conditions is noticed:
-@ No sound is heard when the power is turned on.
@ Sound stops during performance.
The function of this circuitry is to prevent circuitry
damage if, for example, the positive and negative speaker
connection wires are ‘‘shorted’’, or if speaker systems
with an impedance less than the indicated rated
impedance of the amplifier are used. |
G3) Insert the pin into the top
panel. (Push in and turn 1.
© Connect the turntable and
speakers with their respective
Notes: .
When using the direct
connectors, do not use pin
cords. |
2. When using the graphic
equalizer (SH-E5), place it
between the amplifier and the
tape deck. |
@) Lower the amplifier onto the
tape deck. Line up the direct
connector and stabilizing pin
a
(SU-3)
RS-5)
G) Connect the tuner to the
amplifier the same way as in @
3. Position the units in a straight
column to avoid twisting and
breaking the direct connectors.
If this occurs, follow the procedure outlined below:
1. Turn off the power. |
2. Determine the cause of the problem and correct it.
3.. Turn on the power once again. : |
Note: Once the protection circuit operates, the unit Is
- not reset even when there is no abnormality. So,
turn off the power supply and, about 60 sec.
later, turn it on again. —
fH BEFORE REPAIR AND ADJUSTMENT |
Turn off the power supply and short-circuit both ends of power supply condensers (C501, C502, 4700 uF) at
resistance (about 1082, 5W) in order to discharge the charged voltage. Avoid short-circuit with a screwdriver or the like,
otherwise the transistors or diodes may break down. | |
Before turning on the power supply after completion of repair, slowly apply the primary voltage by using a voltage
regulator to make sure that the current consumed is free of abnormality The current consumed at 60Hz/50Hz in no
signal mode is shown below with respect to supply voltage 110/120V/220V/240V.
|
80Hz
|
—60~130mA
55
~120mA
45~90mA
40~85mA
60~130mA
55
~120mA
(45~90mMA
|
40~85mA
AC120V AC240V
Current consumed