General Information - RCA SelectaVision VideoDisc SJT 400 Basic Service Data

GENERAL INFORMATION 1983 5ЈТ 400
Note: Technicians servicing this product will find helpful
the following related RCA Technical Training
Publications.
VideoDisc Manual SJT200/300-1
VideoDisc Manual SJT400 TR
These publications may be ordered, for a nominal
charge, from: RCA Technical Publications 1-450, P.O.
Box 1976, Indianapolis, IN 46206.
The New RCA SelectaVision Random Access VideoDisc
Player is simple to operate, and easy to install. External
connections to and from the player are minimal, involving
only intercept and reconnection of the television VHF an-
tenna input lead (cable). Necessary connecting lead
(cable) and matching transformers are included to handie
all but unusual installations.
1. A 5 foot, 75 ohm coaxial cable connects from the an-
tenna out connector on the player, to the VHF anten-
na input on the television receiver. Use cable direct if
the television has 75 ohm VHF antenna input connec-
tor; use via а 75 to 300 ohm matching transformer /
adaptor if the television VHF antenna input is 300
ohm.
2. A300 to 75 ohm matching transformer / adaptor mates
a 300 ohm twin lead antenna system (outside or rabbit
ears) to the player 75 ohm antenna input system.
(Captive, screw type lugs are integral to the 300 to 75
ohm antenna matching transformer/adaptor; strip
and insert the 300 ohm twin lead wires then tighten
the screws.) Keep in mind — for different or "ода" an-
tenna systems — the antenna input and output of the
Video Disc Player is 75 ohm unbalanced
Antenna connection instructions should be carefully
followed. The player produces an R-F signal which is
transmitted on VHF Channel 3 or 4 (switch selectable) fre-
quency. If the player antenna output is connected to an
antenna, directly or in parallel from the television antenna
input connections, the player may broadcast a signal.
Broadcasting an unauthorized signal could violate certain
regulations of the Federal Communications Commission
regarding the operation of R-F devices. Recheck the in-
stallation to avoid any broadcasting possibilities; make
sure the 75 ohm shielded cable is used to connect the R-F
output of the player to the television receiver, and that no
other connections are paralleled from these terminals.
The physical location of the antenna "in" and "out"
connectors are depicted in the rear apron photo of the
Video Disc Player (Fig. 2). "Е" type connectors accept the
VHF antenna input and output cables.
Interface of the antenna system, Video Disc Player, and
monitor television receiver is controlled by an electronic
antenna switch in the player. When the Player ON/OFF
Switch is in the "OFF" position, the antenna is connected
directly (via the player electronic antenna switch) to the
television receiver and the television will operate погта!-
ly. When the player ON/OFF switch is in the "ON" posi-
tion, the antenna is disconnected and the player R-F out-
put is connected directly to the television VHF antenna
input connector. Under this condition the television re-
ceiver will receive a signal only on Channels 3 or 4 (switch
selectable on the rear of Video Disc Player Fig. 2). Specifi-
сайу the Video Disc Player antenna switch system serves
to either connect the antenna system direct to the televi-
sion VHF antenna input or disconnect the antenna system
and connect the Video Disc Player R-F output direct to
the television VHF antenna connector
Stereo output jacks are available for connecting (cable
included) stereo sound output to an external Stereo Am-
plifier (optional equipment). Also available is a Video Out-
put Jack for connecting (cabie not included) a video sig-
ngl directly to a television receiver or video monitor
equipped with video input capabilities.
The new design of the RCA VideoDisc player uses the
single—main circuit board concept The main circuit
board contains nearly all of the electronic circuits. Cir-
cuits not contained on the main circuit board are АС in-
put, resonator, pick-up arm preamp, and in the case of the
remote controlled Random Access VideoDisc player, the
remote preamp and remote control/Features/on screen
display circuits.
Servicability of the new VideoDisc player is enhanced
by the logical physica! arrangement of circuits on the
main circuit board. The board is segmented by circuit
area. AND FURTHER ENHANCED BY PROMINENT ROAD
MAPPING ON THE CIRCUIT BOARD. In addition, a com-
ponent numbering system is used which relates to gener-
al circuit areas and will aid in readily locating individual
components.
The SJT 400 VideoDisc player has the capability of ran-
dom access to any area of the disc. Included with the unit
is an infrared hand unit which allows the user to control
ail functions of the player except Power On/Off and cad-
dy insertion /removal. Front panel buttons are provided to
contro! simple functions of the player along with a two
digit LED digital display device
To assist the user during the Hemote Handom Access
and Program operation, the player displays an on-screen
message which indicates the operating state of the Video-
Disc player, prompts the user with the appropriate action
to be taken, and assists in programming the Random ac-
cess features
There аге two IR remote units capable of controlling the
random access VideoDisc player. The CRK-36 (furnished
with the player) is dedicated solely to the control of the
SJT 400 player. The CRK-32 (referred to as the Digital
Command Center) can contro! not only the SJT 400
VideoDisc player but certain other RCA home entertain-
ment products having IR controlled capabilities.
For complete CRK 36 iR Remote Random Access and
Program operation instructions refer to SJT 400 Owner's
Manual Part No. 2817354.
For complete СВК 32 IR Remote "Digital Command
Center" operation instructions refer to RCA Technical
publications File 1983 DCC-1.