Circuit Protection - RCA SelectaVision VideoDisc SFT 100 Service Data

СЕО-1
CIRCUIT PROTECTION
Fuse (or Device) Circuit Protected
F1 1 Amp SB (426973) AC input
F2 1/4 Amp SB (149004) Power Supply
Physical Location
PW АС In circuit board
PW AC In circuit
FREQUENTLY USED ABBREVIATIONS
AM — Audio Mute (or Audio Modulation)
AO — Arm Output
AS — Arm Stretcher
C — Capacitor
CF — Ceramic Filter
CO — Clock Output (or Chroma Output)
CR — Diode
CV — Control Voltage
CY — Cored Luminance
F — Fuse
G — Ground
Hz — Hertz
J — Jack
KPO — Kicker Pulse Output
Е — Coil
M — Motor
OS — Optical Switch
P — Plug
PLL — Phase Lock Loop
PS — Power Switch
Q — Transistor
R — Resistor
RS — Radius Sense
$ — Switch
SB — Sound Beat
SC — Stylus Clean
SL — Stylus Lifter
SM — Servo Motor
$0 — Squelch
SR — Sound Reference
SS — Servo Signal
U — Integrated Circuit
V — Voltage
VR — Voltage Regulator
VDO — Vertical Detail Output
Y — Luminance or B/W Video
Z — Impedance
GLOSSARY
ANGSTROM — One tenth of a millimicron. Angstrom unit is а
term utilized to express the length of very short
waves.
BEATS — A term used to describe the unwanted signals pro-
duced when two original signals are mixed together.
BURIED SUBCARRIER — See Subcarrier, except frequency is
down converted. Example: In CED
system color burst is 1.53 MHz.
BURST — А short time occurance (8 to 10 Hz) of the color sub-
carrier signal appearing right after Horizontal sync.
but centered on the blanking portion of the video
waveform.
C — Designates capacitor on schematics and in parts list.
CF — Designates Ceramic Filter on schematics and in parts list.
CR — Designates Diode on schematics and in parts list.
Caddy — Name given to device in which the VideoDisc is
enclosed.
Chroma — The color portion of a video signal.
DAXI — Digital Auxiliary Information recorded on the disc and
utilized by the system control microprocessor to con-
trol operation of the disc player.
Delta Frequency (4f) — А term to indicate that a signal or fre-
quency has some variation or change.
Dropout — А momentary absence of carrier signal off the disc,
whether due to uneven stamping or a particle of
dust on the disc or stylus.
Deviation — А term used to describe how far the FM carrier fre-
quency swings when it is modulated.
Emphasis — The process of boosting the level of the high fre-
quency portions of the video signal.
FM Signal — Abbreviation for Frequency Modulated Signal.
Field — One half of a television picture. A field consists of 262.5
horizontal scanning lines across a picture tube. Two
fields (line 1 thru 252.5 and line 252.5 thru 525 in-
terlaced) are necessary to complete a fully scanned
television picture (frame). The two sweeps of the TV
picture tube, or two fields make up one complete TV
picture or "frame". Frame repetition is 30 Hz, therefore
field repetition is 60 Hz.
Frame — One complete television picture (see "Field").
Gate — A circuit which will deliver an output only when a
specific combination of its inputs are present for use in
analog or digital applications.
IC — Designates Integrated Circuit on schematics and in parts
list.
Interlacing — The property of the scan lines of two television
fields to lie in-between each other.
Interleaving — А term used to indicate that the harmonics of the
chrominance signal lie in-between the har-
monics of the luminance portion of the video
signal as it is viewed on a spectrum analyzer.
This means that the color information of a video
signal does not interfere with, although it is
broadcast at the same time as, the luminance in-
formation.