Technics SA 818 Service Manual

Page 2

requenc ra _\

sensitlvity a dBf (1 a pv lI-IF 58)
_ I, 50 dB quleting sensitivity ,

' MONO 13.2 dBf (2.5 pv IHF '58)

. .. STEREO 36.2 dBf (35.4 yV IHF '53)

Islortlon (normal)
' 0.15% (MONO). 0.25% (STEREO)
0.1% (MONO). 0.15% (STEFIEO)
0.25% (MONO). 0.3% (STEREO)

STEREO
Frequency response
Alternate channel selectivity
normal i400 kHz
narrow i400 kHz
' narrow i300 kHz
Capture ratlo (normal)
Image rejection at 98.1 MHz
IF rejection at 98.1 MHz
Spurious response reiectlon at 98.1 MHz'
AM suppression
stereo separation (normal)

20 Hz~15 kHz. +0.2 d

45 dB

1 kHz

10 kHz 35 dB
Carrier leak

19 kHzr -65 dB

38.](Hz -70 dB

25m, Says. 75ys
300 ohms (balanced)
75 ohms (unbalanced)

FM eta-emphasis
Antenna terminals

Sensitivity
Selectivity
Image reiection at 1000 kHz
IF rejection at 1000 kHz

I GENERAL.

3 AA" size batteries :

Panasonic UM- 3 or equivalent

. . 566 X 172 x 396 mm

' 22- 9/32" >< 6-25/32 x 15- -19/32")
18 5 kg

(40. 8 lb.) '

(Note:
Total harmonic distortion is measured by the digital spectrum
analyzer (HP, 3045 system).

This unit is equipped with an FM/AM allocation selector on
the rear panel. The specifications shown above are correct
with this selector set lathe FM 200 kHz/AM 10 kHz position.
If it is set to the "FM 50 kHz/AM 9 kHz" position. however,
the FM frequency range becomes 87.5~1OB.0 MHz. and the
AM frequency range becomes 522~1611 kHz.

CONTENTS

LOCATION OF CONTROLS ............ . .
BEFORE STARTING THE REPAIRING .
DISASSEMBLY INSTRUCTIONS ........
ADJUSTMENT POINTS .......... .
ADJUSTING INSTRUCTIONS
LOCATION OF P.C.B. . . .
PRINTEDCIRCUIT BOARDS . . . . . . . . . . . . . . . . :13~22
BLOCK DIAGRAMS .................. 1 . l . .23~25

LOCATION OF CONTROLS

Program indicators

Safety Indicators

BLOCK DIAGRAM OF IC' 5 ;'. " -
REPLACEMENT PARTS LIST (Electrical Parts)

HOW TO REPLACE CHIPS. . . . . .
VARIABLE RESISTORS .,.
SCHEMATIC DIAGRAM A
SCHEMATIC DIAGRAM B,

EXPLODED VIEWS . . . . ,1 . . . . ........... 42~45
REPLACEMENT PARTS LIST L .. .3
(Cabinet & Chassis Parts). I, ~..- ........ . ............ 46

Preset~channel indicators

Peak-power indicators

FMV lF-band indicators

Signal strength. indicators

Memory indicator

FM stereo indicator

4 I. Quartz-lock indicators