Technics SU-Z400 Service Manual

-} U Ey 4 Tele)
(R ch)
(Playback)
Tape 2/ext—| eh)
Speaker impedance switch
CD/video/aux input hee and Remote 162 4 Main and Remote 8Q
Main or Remote 8 ~ 162 Main or Remote 4 ~ 62
—__ Main speaker terminal
Phono input
AC inlet (except for [XL] )
Ground Voltage selector
+ (For [XA] and [PC] area only)
peer pus (120V <—©110V —»220V <—»240V)
(Rec out
Tape i onus) AC outlets (For [XA] and [PC] area only)
(Playback) bien
Remote speaker terminal
(R ch)
@ The power supply for this unit varies depending upon the areas. Also, the parts used for power supply are different.
So, refer to the circuit diagram and the replacement parts list.
* 220V (50/60Hz) for continental Europe. (Except for United Kingdom)
* 240V (50/60Hz) for Australia and United Kingdom.
* 110V/120V/220V/240V (50/60Hz) for other areas. (For other areas [XA and PC] are provided with voltage selector and
AC outlets)
* Phono input capacitance is about 150pF.
Mi
PROTECTION
CIRCUITRY
The protection circuitry may have operated if either of the If this occurs, follow the procedure outlines below:
following conditions is noticed: 1. Turn off the power.
@ No sound is heard when the power is turned on. 2. Determine the cause of the problem and correct it.
® Sound stops during a performance. 3. Turn on the power once again after one minute.
The function of this circuitry is to prevent circuitry damage
if, for example, the positive and negative speaker connection
wires are ‘‘shorted’’, or if soeaker systems with an impedance
less than the indicated rated impedance of this unit are used.
Note
When the protection circuitry functions, the unit will not
operate unless the power is first turned off and then on
again.
Mi BEFORE REPAIR AND ADJUSTMENT
1.
Turn
off
the
power,
Discharge
both
power
supply
capacitors
(C904,
C905,
6800uUF)
through
a
10
ohm,
5W
resistor
to
ground.
Do
not
short
between
C904
and
C905.
It
may
damage
the
capacitors.
2.
After
completion
of
repair,
slowly
apply
the
primary
voltage
by
using
a
variac
to
avoid
over
current.
Current
con-
sumption
at
60Hz/50Hz
in
no
signal
mode
should
by
shown
below
with
respect
to
supply
voltage
110V/120V/
220V/
240V.
Power
supply
voltage
AC110V
AC120V
AC220V
AC240V
ae mo ey 115 ~ 225mA [EK, XL]
290 ~ 580mA 265 ~530mA 145 ~285mA 135 Seem A lother!
nm as aS 105 ~ 205mA [EK, XL]
60Hz 232 ~464mA 212 ~424mA 116 ~228mA 108 ~ 212mA [other]
Mi SELECTING THE CORRECT SPEAKER IMPEDANCE
Consumed current
1. When one pair of speaker systems is being used, connected Note that, if 2 pairs of speaker systems are used at the same
to the MAIN or REMOTE terminals, set the speaker time, determine the composite impedance as described
impedance selector to the range, “4~6Q” or “8~162”, which below.
matches the impedance of the speaker systems being used. R,XR, Where:
2. When two pairs of speaker systems are being used, Ae R, +R, R=total impedance
Connected to the MAIN and REMOTE terminals: R;=impedance of speaker systems
1)If the impedance of both systems is 16 ohms, set the connected to “MAIN” terminals
speaker impedance selector to “16”. R2=impedance of speaker systems
2) If the impedance of both systems is 8 ohms, or one is 8 connected to “REMOTE” terminals
ohms and the other is 16 ohms, set the speaker impedance
selector to “8Q”.
pa drs

Technics SU-Z400 Specifications

General

Brand	Technics
Model	SU-Z400
Category	Amplifier
Language	English