Technics SX-KN930

d)
IN
i
PRECAUTIONS BEFORE SERVICING
I Precautions for measuring of the output waveforms.
1.The waveform was measured with a “National Digital Storage Oscilloscope YP-5730A”. Therefore the waveforms of musical
tone signals shown may differ somewhat due to the difference in the timing of triggering.
2.Since the 1/10 test probe is used, the indicated voltage value on the bottom part of each waveform photo is 1/10 of the
actual value (e.g. 0.2 V/em should be 2.0 V/cm).
3.To measure the waveforms, first set this unit to the self-diagnostic mode (refer to page I -12, No.3). The Wave ROM output
will then be output as a sine wave to facilitate the servicing check.
I Important safety notice:
Components identified by a/\ mark have special characteristics impotant for safety.
When replacing any of these components, use only manufacture’s specified parts.
I Symbolic Marks
The symbolic marks for resistors and capacitors which used in this circuits are classified as following TABLE-1 and TABLE- 2.
1. RESISTORS
«Resistors without symbolic mark are FIXED CARBON FILM RESISTORS(ERD- type).
*All resistors are 1/4WATT, + 5%TOLERANCE unless otherwise designated in schematic diagrams.
(TABLE- 1)
SYMBOL SPECIFICATION SYMBOL SPECIFICATION
© Fixed Carbon Film Resistors ® Fixed Metal Film Resistors
“FLAME- PROOF”(ERD—F—type) “FLAME- PROOF”(ERX—type)
© Fixed Wire Wound Resistors Fuse Type Fixed Metal Oxide Film
“FLAME- PROOF”(ERF—type) Resistors “FLAME- PROOF”(ERQ—type)
© Fixed Metal Oxide Film Resistors Fuse Type Fixed Carbon Film Resistors
“FLAME- PROOF’(ERG—type) “FLAME- PROOF”’(ERD2FC—type)
(
Fixed Metal Film Resistors (Precision and High Stability) (ERO—type)
2, CAPACITORS , ;
*Capacitors without symbolic mark are POLYESTER CAPACITORS. (ECQM- type, ECQG-type, + 10%Tolerance)
*Polarized capacitors without symbolic mark are Aluminum Electrolytic Capapcitors. (ECEA-type, + 20%Tolerance)
(TABLE- 2)
SPECIFICATION
a
[@[Farsunsaieeeneyiccapmcme LCR Be
Metalized Plastic Film Capacitors(TF Series) ECQV_type
ECC_type
Temperature Compensating Ceramic Capacitors
: ; ; ; : ECK_type
High-Dielectric Constant Ceramic Capacitors ECR type
Axial Lead Ceramic Capacitors