RCA SelectaVision VideoDisc SJT 400 Basic Service Data page 9

АМ — Audio Модшаноп
AMA — Audio Mute Primary Channel A
AMB — Audio Mute Secondary Channet В
ANX — Antenna Transfer
AO — Arm Output
AS — Arm Stretcher
CAB — Channel A/B
CO — Clock Output (or Chroma Output)
CR — Caddy Reverse
CS — Caddy Sense
CV — Control Voltage
CY — Cored Luminance
DD — Decoder Defeat
DG — Defect Gate
DS — Dispíay
FM — Function Motor (or Frequency Modulation)
GND — Ground
HE — Hall Effect
HNC — Home Normally Closed
HNO - Home Normally Open
Hz — Hertz
IC — integrated Circuit
КРО — Kicker Putse Output
LA — Landing
LED — Light Emitting Diode
LO — Load
LSE — Least Significant Digit Voltage
MA — Modulator Audio
MSE — Most Significant Digit Voltage
NS — Negative Supply
FREQUENTLY USED ABBREVIATIONS 1983 SJT 400
OSD — On Screen Display
P — Play
PAU — Pause
PLL — Phase Lock Loop
RAF — Random Access Forward
RAR — Random Access Reverse
RES — Reset
ВКМ — Remote Keyboard Microcomputer
RS — Radius Sense
RSF — Rapid Search Forward
RSR — Rapid Search Reverse
SB — Sound Beat
SC — Stylus Clean
SI — Side Indicator
SL — Stylus Lifter
SQ — Squelch
SR — Sound Reference
SS — Spine Sense
SWP — Sweeper (in Arm Stylus Cleaner)
TT — Turntable
UNL — Unload
V — Voltage
VB — Video Blanking
VDO — Vertical Detail Output
VR — Voltage Reguiator
VSF — Visual Search Forward
VSR — Visual Search Reverse
Y — Luminance or B/W Video
Z — Impedence
SAFETY RELATED COPPER PATTERN
Modern circuit design/manufacturing techniques dic-
tate a rather high component density on the printed cir-
cuit board utilized in this instrument. It naturally follows
that the area available for "printing" copper patterns is al-
зо restricted. To maintain high reliability and safety stan-
dards, the printed circuit boards are manufactured under
carefully controlled conditions and to extremely close tol-
erances. Some areas of the board are more critical than
others due to spacing, pattern size, voltage/current re-
quirements, etc. RCA has concluded, as a result of exten-
sive studies that !ess-than-optimum repair of copper pat-
terns in these specific areas can degrade the reliability /
safety of the instrument. The critical copper patterns are
shown as "dark black" in the illustration (Fig. 3). In the
event printed circuit damage is evident in these designat-
ed areas (copper pattern broken, lifted, etc.) special sol-
dering techniques are necessary to maintain reliability
and safety standards. Contact your local RCA Consumer
Electronics Distributor Service Manager before attempt-
ing copper pattern repair in the designated areas on the
board layout
Выра
Fig. 3—PW 600 Critical Copper Pattern