Technics SU-Z980 User Manual

SU-Z980
m CONTENTS
CIRCUIT BOARDS AND WIRING
CONNECTION DIAGRAM
SCHEMATIC DIAGRAM
DESCRIPTION OF FL PANEL
BLOCK DIAGRAM
EXPLODED VIEW
REPLACEMENT PARTS LIST
TERMINAL GUIDE OF IC’s, RESISTORS AND CAPACITORS
TRANSISTORS AND DIODES\ ...............00. cece cece eee ee eee 8
m BEFORE REPAIR
(1)Turn
off
the
power
supply.
Using
a
109,
5W
resistor
connect
both
ends
of
power
supply
capacitors(C703,C704,10000uF) in order to discharge the voltage.
(2)Before
turning
the
power
supply
on,
after
completion
of
repair
,
slowly
apply
the
primary
voltage
by
using
a
power
supply
voltage
controlier
to
make
sure
that
the
consumed
current
at
50Hz/60Hz
in
NO
SIGNAL
mode
should
be
shown
below
with
respect
to
supply
voltage
110V/127V/220V/240V.
Power supply voltage AC110V ACi27V AC220V AC240V
Consumed current 50Hz 280 ~ 530mA |} 250 ~ 500mA | 140 ~ 270mA | 120 ~ 250mA
Consumed
current
60Hz
280
~
530mA
|
250
~
500mA
|
140
~
270mA
|
120
~
250mA
m PROTECTION CIRCUITRY
The protection circuitry of the amplifier may have
operated if either of the following conditions is noticed:
@ No sound is heard when the power is turned on.
@ Sound stops during a performance.
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.
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.
Note:
When the protection circuitry functions, the unit will not
operate unless the power is first turned off and then
on again.

Technics SU-Z980 Specifications

General

Brand	Technics
Model	SU-Z980
Category	Amplifier
Language	English