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SU-V55A
Technics SU-V55A User Manual
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Manual
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MEASUREMENTS
AND
ADJUSTMENTS
Control
positions
and
equipment
used.
•
Volume
knob
0
(Minimum)
•
Main
speaker
selector
off
•
Remote
speaker
selector
off
•
Speaker
impedance
switch
.
.
.
.
•
DC
electronic
voltmeter
(EVM)
8^2
~
16f2
IDLING
(ICQ)
ADJUSTMENT
1.
Test
equipment
connection
is
shown
in
figure.
Connect
the
DC
EVM.
on
both
channels.)
2.
Turn
the
ICQ
control
volume
(VR401,
VR402)
counter-clockwise.
3.
Turn
ON
the
set
when
it
is
cold,
and
15
sec.
later,
adjust
VR401
and
VR402
so
that
the
voltage
is
50mV
Also,
check
that
the
voltage
is
60
~
85mV
(standard:
80mV)
after
lapse
of
10
—
15
minutes.
(Below
85mV
after
lapse
of
60
min.).
d)
®
QQIQS
*®
d)'
Lch.
Rch.
DC
EVM
2SA1309
2SC3311
MA165,
MA167
SVDS10VB20F
SVDSR1K2LF
MA29WA
MA4062M,
MA4033M
MA4160M
LN021315P
LN014314PH1
LN064316P
4
6
Table of Contents
Specifications
1
Contents
2
Location of Controls
2
Protection Circuitry
2
Before Repair and Adjustment
2
Disassembly
3
How to Remove the Front Panel
3
How to Remove the P.C.B.
3
How to Remove the Main P.C.B.
4
How to Remove the Power IC.
4
Measurements and Adjustments
5
Idling Adjustment
5
Adjustment Points
5
Terminal Guide of IC, Transistor and Diodes
5
Printed Circuit Boards and Wiring Connection Diagram
6
Schematic Diagram
12
Block Diagram
12
Replacement Parts List
13
Exploded View
15
4
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Technics SU-V55A Specifications
General
Type
Integrated Amplifier
Speaker Load Impedance
4Ω to 16Ω
Damping Factor
60
Input Sensitivity
2.5mV (MC)
Dimensions
430 x 125 x 350 mm
Channel Separation
70 dB
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