Technics SA 210 K Service Manual

Page 2

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AM suppresslon 50 dB Sensltlvlty (5m 20 as) 20 V, 300 pV/ln
Stereo separation Selectiylty 55 dB
1 RH: 40 dB Image relecllon at 1,000 kHz 40 dB
10 kHz 30 dB IF rejecllon at 1.000 kHz 60 dB
Carrler leak
19 kHz -33 dB (-35 dB, IHF) I GENERAL
35 kHz -50 dB (-50 as, lHF)
Channel balance (25!) Hz~6,300 Hz) i1 5 63 Power consumption 220W
Limiting point 1-2 uV Power supply
Bandwidth For Unlted Kingdom and Auslralla AC 50 Hz/GO Hz, 240V
IF ampliller 150 kHz For conllnental Europe AC 50 Hz/eo Hz. 220v
FM demodulator 1000 kHz For others AC 50 Hz/60 Hz, 110w120w220w240v
Antenna terminals 3000 (balanced) Dlmenslons (WXHXD) 430 X 97 X 243 mm
750 (unbalanced) (16-15/16 x 3-13/16>< 9-9/16")
Welght 5.1 kg
I AM TUNER SECTlON (12 3-)
Frequency range 522~1811 kHz (9 kHz-step)
530~1620 kHz (10 kHbstep)

Page
LOCATION OF CONTROLS. . PRINTED CIRCUIT BOARDS ................... 10 ~11
PROTECTION CIRCUITRY ......... . , . _ . BLOCK DIAGRAM . _ . . 12 ~ 14
BEFORE REPAIR AND ADJUSTMENT .......... SCHEMATIC DIAGRAM ................ . . . 15 ~19

3 .
HOW TO PRESET RADIO BROADCAST FREQUENCIES . 4 FUNCTION OF TERMINAL (PLL CONTROLLER ICSOI) .

DISASSEMBLY INSTRUCTIONS .............. -4'~ 6 RESISTORS 81 CAPACITORS .................
MEASUREMENTS AND ADJUSTMENTS .......... 7,8 REPLACEMENT PARTS LIST. . V ........ 22
T'ERMINAL GUIDE OF TRANSISTORS, DIODES AND IC 9 EXPLODED VIEWS ......................... 23 24

I LOCATION OF CONTROLS

Memory button

Up
Tuning buttons-1
down

Digital frequency display

Qua nz-Iock indicator

Signalatrength .
indicators Tape monltor/aux
FM stereo Indicator (1 mums. - tape/flu

Band selector (tuner)

Input selectors
(l FM, _ AMI (phenol

Volume control

Auto scan/FM mode selector
I I. on/autc, - off/mono)

FM/AM preset rrunlng (ch. 1 ~ ch. 7)

Bass co nt ml

Treble control

Balance control

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FM antenna terminals

(Unbalanced)

AM allocation

(GkHz a. 10kl-lz stein]
(ForlXAJanleLl
areas only)

Ground-J

Phono input

Rec outj

Tape deck-E
Playback,

aux input

AM loop antenna terminal

AM antenna terminal

Battery case (memory reserve)

[Lch.l Speaker terminals

AC OHIIEI (Unswnchedl
150W MAX (For [XA] area only)

LVoltage selector
(on the bottom board)
(For [XA] area onlyl

(RchJ Speaker terminals

- FM antenna terminals (Balancedl

O The power supply for this unit varies depending upon the areas. Also,the parts used for power suDDly aredifferent.
So, refer to the Circuit diagram and the replacement parts list.
* [XA] area is provided with voltage selector and AC outlet

240V (50/50Hz) for Australia.
220V([50/60Hzl for Continental Europe

* llOV/l20V/220V/240V (SO/EOHzl for other [XA] area.
* [XA] and [XL] areas are provided with AM allocation switch.

* Phono input capacitance is about l50pF.

I PROTECTION CIRCUITRY

The protection circuitry may have operated if eigher of
the following conditions IS noticed:

I No sound is heard when the power is turned on.

I Sound stops during performance.

The function of this circuitry is to prevent circuitry
damage if, for example, the positive and negative speaker
with an impedance less than the indicated rated lm»
pedance of the amplifier are used.

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

Note:
When the protection circuitry functions the unit will not
operate unless the power is first turned off and then on
again

I BEFORE REPAIR AND ADJUSTMENT

1. Turn off the power supply and shortcircuit of the power supply capacitors (C702, C703, 4700;1F) with a resistor
(about 1052, SW) to discharge the charged voltage. Do not short both ends of C702 and C703 with a screwdriver,

it may damage the component.

2. Before turmng on the power supply after completion of repair, slowly apply the primary voltage by using a power
supply voltage controller to make sure that the consumed current is free of abnormality. The consumed current at
BOHz/SOHZ in no signal mode is shown below with respect to supply voltage 1 lOV/lZOV/ZZOV/24OV.

Power supply voltage AC1 10V l AC120V i ACZZOV ACZ4OV
50 Hz l20~420mA I 110 ~4lO-rnA I 60~210mA 50~200mA
Consumed Current ¥"7 -*-* -' ,_
60 Hz 1iO~4iOmA 100~400mA 50~200mA 40~lQOmA