Technics SUMA 10 Service Manual

Page 2

I GENERAL Notes:
1. Specifications are subject to change Without notice.
Power consumption 920 w Weight and dimensrons are approxlmate.
Power supply 2. Total harmonic distortion is measured by the digital spectrum
For Continental Europe and Germany analyzer.
AC 50Hz/60HZ, 220V
For Great Britain AC 50Hz/60Hz, 240V
Dimensions (WXHXD) 430><433 mm
(lGS/is><75/is> Weight 25 kg (55 lb.)
I CONTENTS
Page
BEFORE PEpAm ___________________________ SCHEMATIC DIAGRAM ................... 21 ~ 29
PROTECTION CIRCUITRY _ , _ . _ _ PRINTED CIRCUIT BOARDS . . . . . . t . , . 30~36
ACCESSORY ______________________ WIRING CONNECTION DIAGRAM ................ 37
FRONT PANEL CONTROLS AND FUNCTIONS . TERMINAL GUIDE OF IC'S, TRANSISTORS
CONNECTIONS ___________________ AND DIODES .......................... 38
FEATURES ,,,,,,,,,,, EXPLODED VIEW ................ 39~41
DISASSEMBLY INSTRUCTIONS __________ REPLACEMENT PARTS LIST ........... 42~46
MEASURMENTS AND ADJUSTMENTS RESISTORSBICAPAClTORS . . . . t . . . . 47~49
TERMINAL FUNCTION OF ICS _ , , _ PACKING ................................ 50

BLOCKDIAGRAM......,........:::

IBEFORE REPAIR

(1) Turn off the power supply. Using 3100,5W resistor connect both ends of power supply capacitors (0551A,
C552A, IZOOOuF) 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 controller to make sure that the consumed current at 50H2I60 Hz in NO SIGNAL mode
should be shown below wlth respect to supply voltage 220V/240V.

Power supply voltage AC220V AC240V
Consumed current GOHZ 140 ~ 400mA 130 ~ 360mA
Consumed current 60HZ 120~ 350mA 110 ~ 320mA

I PROTECTION CIRCUITRY

The protection circuitry may have operated ii either of the iollowing appears in the output.
conditions Is noticed: If this occurs, follow the procedure outlined below:
0No sound is heard when the power is switched ON. 1. Switch OFF the power.
(The power indicator will not change from green to red.) 2_ Determine the cause of the problem and correct it.
OSound stops during a pertormance. 3. Switch ON the power once again.
The function of this circuitry is to prevent Circuitry damage it, for Note:
example, the positive and negative speaker connection wires are When the protection circuitry tunctions, the unit will not operate
shorted", il speaker systems with an impedance less than the unless the power is first switched OFF and then ON again.

indicated rated impedance of this unit are used, or it DC voltage

I ACCESSORY

CAC power supply cord .................... 1
SFDACOSEDB .................... (E), (EG)
SJA193

Page 3

IFRONT PANEL CONTROLS AND FUNCTIONS
2 W

E7? 6

m

Power switch/indicator (power)

When the power is turned on, the green indicator lights, and
after about 4 seconds it changes to red to indicate that the unit
can now be operated.

The protection circuit is activated and the indicator will not
change to red when trouble in the Circuitry, such as a
short-Circuit in the + and 7 speaker cords or a DC
voltage generated in the output, has been detected.

Volume control/indicator (volume)

There are two types of volume scale indications: one for
when the input selector is set for an analog position and one
for when it is digital position (indicator Will illuminate).

Lock indicator (lock)
Indicates that a digital Signal is being received and that the
amplilier is in operational status.

Sampling frequency indicators

(sampling frequency)

The appropriate indicator will illuminate whenever a digital
signal with one of the sampling frequencies listed below is
deteCted at the "DlGITAL iNPUT" (®~©) or DAT" digital
terminal on the rear panel of this unit.

Note that some digital components (compact disc players,
etc) emit digital signals whenever their power switches are
ON.

32 kHz: For digital Signals with the 32akHz mode sampling
frequency

44.1 kHz: CD and others

48 kHz: For digital signals with the 48-kHz mode sampling

frequency

Phono cartridge selector (phono selector)
This selector should be set to the posttion which corresponds
to the type of cartridge used on the turntable.

Input selector (input selector)
This selector is used to select the sound source to be heard,
such as a disc, radio broadcast, etc.

Recording output selector

(recording selector)
This selector is used to select the sound source to be
recorded by the connected tape deck arid/or DAT.

Digital input selectors/indicators

(digital input selector)

These selectors are used when a component connected to
one of the DIGITAL INPUT (®~©) terminals (on the rear
panel of this unit) is to be used as the sound source.
First set the main input selector to the digital" position and
then use the digital input selector to select the digital sound
source. (The corresponding indicator wili illuminate.)

DAT monitor switch/indicator

(DAT monitor)

This is used for monitoring when playing back a tape in the
DAT component connected to the DAT digital terminals (on
the rear panel of the unit) or when digitally recording material
onto a DAT tape from a digital component.

Speaker selector (speakers)

This selector is used to select the speaker systems to be

used.

off: No sound will be heard from the speaker systems.

A: Sound can be heard from the speaker systems con-

nected to the A" terminals.

B: Sound can be heard from the speaker systems con-

nected to the B" terminals.

A+B/bi-wiring: Sound can be heard simultaneously from
the speaker systems connected to the A
terminals and the B" terminals.

Or, it bi-wned speaker systems are con-
nected, sound can be heard from them

Headphones jack (phones)

MA1

Page 33

Ref. No. Part No.

Values & Remarks

0750 000111210st 25v 0010
0757 0001104721015 10v 47000
T515752 0050111104255 500 0110 7
W 70001110010030 710v 10L 7
0754,7155 00011010325 250 0.010 7
0771470 000110104255 500 010
0777-703 000110104215 50v 0.10
0705,7110 500110104255 500 0.10
0700, 700 000110104255 50v 0.10
0702703 500110104255 50v 0.10
0704 500010121005 50v 1200
0705 000010121105 500 1200
0706 500110270157 50v 271»
0000,1104 000110104255 501' 0,10 7
0005000 00000032210 5.3V 2200
007010 002110sz4701? 15v 470
0011,1312 5001111151023 500 15007 7
0010014 000010150005 500 151)
@5015 0010110101125 50v 100?
0021022 5001110023300 15V 030
0025025 0010110022123 50v 02001>
0027,0213 50011103311237 50v 330?
0020030 1000111102023 500 1000p 7
0001002 001010121st 500 1000
0030,1134 0001110022210 100 2200
0005,0215 500010472127 50v 4700?
0051,1152 500010151st 50v 1500
E50054 5000111150005 500 1517
0051 10100101010 613V 1000
0052 00010101000 25v 100 7
0054 505111010000 10v 101 7
0055 0000000102 0.30 10001 7
0050 501010473120 ' 500 0. 0470
0057 00001503030 250 3.30
0050 10000100101 150 1000
M051 11100110104255 500 0.10
0903054 501010102103 50v 10001
0100171000 0051100010110 03v 1001
01000 50000001010 5,30 1000 7
0101171013 Ecmmfif 53V 1000 7
01014 001100052210 0.30 2200
0710151010 5001101021015 50v 1000?
01010710247500110104255 50v 0.10

"71;,

.7

_49_