Pioneer tuning fork, Service Manual

Page: 12 / 55

2
. 3
Parts N u m b e r i n g S y s t e m
OUR numbering system of switches is as follows:
Table 3 Numbering System of Pioneer Switches
Relay
Relay is a kind of switch activated by electro-magnetic
force.
1 . B A S I C STRUCTURE
A relay is m a d e of an electromagnet and contact pieces.
While the coil is open, the movable piece
C touches the
fixed contact piece
B
(break contact). In Fig. 10, when a
current is applied to the coil, C is attracted by the sole­
noid and touches the fixed piece A (make contact.)
Spring
Fig. 1 0 Structure of Relay
2 . KINDS OF RELAYS
Relays are classified into four; power relay, protective re­
lay, small current relay and reed relay.
2 . 1
P O W E R RELAY
Power relay t h a t functions at a predetermined value of
power is used in surge killer circuits of high power ampli­
fiers to reduce inrush current which flows when power is
turned on or in A C power circuits remote-controlled by
an infrared ray. T o withstand a high voltage and large cur­
rent, this relay uses Silver C a d m i u m Oxide (AgCdO) at
contact points. T h e dimensions of contact pieces are larg­
er t h a n those of the other to radiate heat.
10
Coil Yoke
A B
Part Number
Descriptions
S A - 0 0 0
S B - 0 0 0
S C - 0 0 0
S D - 0 0 0
S E - 0 0 0
S F - 0 0 0
S G - 0 0 0
S H - 0 0 0
S K - 0 0 0
SL-000
S M - 0 0 0
S N - 0 0 0
S X - 0 0 0
SAOOOO)
SBOOOO)
SCOOOO)
SDOOOO)
SEOOOO)
SFOOOO)
SGOOOO)
SHOOOO)
SKOOOO)
SLOOOO)
SMOOOO)
SNOOOO)
SXOOOO)
Power s w i t c h
Rotary s w i t c h (to be terminated
w i t h a binder)
Rotary s w i t c h (to be terminated
w i t h a binder small type)
Rotary s w i t c h (others)
Rotary s w i t c h (slide type)
M i c r o s w i t c h
Push s w i t c h or t a c t s w i t c h
Slide s w i t c h
Lever s w i t c h
Snap s w i t c h
Sea-saw s w i t c h
Plate spring s w i t c h
Others