Technics SU 800 Service Manual

Page 2

VLLLLSCHEMATIC DIAC M .

V I CONTENTS
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l
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t}, EFORE REPAIR... 2 _
PROTECTION CIRCUITRY -2 PRINTED CIRCUIT BOARDS 9 ~ 11
ACCESSORY ................... 2 BLOCK DIAGRAM .,.,12
LOCATION OF CONTROLS. 3 D VIE 13 14
DISASSEMBLY INSTRUCTIONS 5 EXPLODE W. .
.LTERMINAL GUIDE 0; IC'S REPLACEMENT PARTS LIST 15.16
5 RESISTORS AND CAPACITORS..17,18

. ~JRANSISTDRSAN DDlODES ............................

(1L)TurVnL Off the power supply Using a too

capacitors(6901 6902 ,4700uF) in order to discha

(2)_B_efore__ turning the power supply on, after comple
a power supply vOItage controller to make sure t

_ should be shown below with respect to supply vol

9 my using
lGNAl; mode

Powersupplyyolta'ge AC110v A0127v= - Aczzov Acz4ov
. Consumed current 50Hz 190 ~. 430mA 180 ~ 400mA 100 ~ 220mA 90 ~ 210mA
. L. current 60Hz 160, , SBOmA 150 ~ 350mA 90 ~ ZOOmA 80 ~ 190mA

j V IPROTECTILON CIRCUITRY

The proteOtion Circuitry may have Operated it either of the ioliowing conditions is noticed:
>I< No sound Is heard when the power is switched ON.
l * Sound stops during a performance.

The function at this circuitry is to pre

connection wires are shorted" , or
' impedance Of this unit are used.

it this Occurs, follow the procedure outlined below

1. Switch OFF the power.

2 Determine the cause of the problem and cOerVeLCt it.

8. Switch ON the power onCe again. I
V Note:

vent circuitry damage it for example, the positive and negative speaker

_ When the protection circuitry functions, the unit will not Operate unless the power is first switched LOFFL and then

ON again.

I ACCESSORY

OPowersupplycordL .....

SJA173...(XL): -'

SJA183.. .(xe)

SJA185.. .(XA) « - ,.
SFDACOSEOS. .(E Ee, EF. EH EB, LEI) , _
SFDACOSGO2 (EK) , .

if speaker systems with an impedance less than the indicated rated L,

I LOCATION OF CONTROLS _ ,

Power switch (power) ,-
Headphones Iack (phones)

Speaker selectors (speakers) , V,

LrTon'chVomrols(bass/treble) _'

Balance control (balance) ,

Vlnputselectors (Input selector)

Audio mutlng switch (muting)

Volume control (volume)

Tbchnlcs u... ,

I.

_ 0..."..."1 u

.~*°

"I...

, . Power indicator
(WWW)

, Loudness switch (loudness)

Tape-monitor selectors (tape monitor)

solely operationVl/Itdlcator (safety) _L

, Main speaker terminal _r

- ' ' ' . Voltage adjust switch
(playback) _, (For [XA] and [x3] areas only)
Ta e 1
P C(Iec out) _
Lr - - AC outlets ,
Tape 2/9 I: (Playback) (R) ; (L) i (For [XA] area only)
(rec out) I . I (Switched/Unswltched)
- Ac Inlet
l
..o_. I
_ I...
l'
l

+ ' I I L :1

(lb . It} tI

(ID , Li 1-: [81°
+ V

; P
Ground 1 I
_ - Speaker Im ance
Phone-y in): - (L) (1 a~Iso,_f:;sO)
Tuner l-,--l-- Remote speaker terminal
CDIAux V

oThe power supply for this unit varies depending upon the areas Also, the arts us

So, refer to the circuit diagram and replacement parts list. p ed for power supply are different
s[XA] area is provided with voltage selector and AC outlets.
I240 V (50/60 Hz) for Australia and United Kingdom.
-220 V (50/60 Hz) for Continental Europe.
*110 V/127 V/220 V/240 V (50/60 Hz) for other [XA] and [X3] areas.
. Phono input capacitance is about 100 pF.