RCA SelectaVision VideoDisc SFT 100 Service Data page 50

CED-1 Service Information Мо. 4
Use
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(2)
Place а program/test disc іп the player.
Remove the access cover and place the service strobe on the program/test disc. А small piece of double-sided tape
may be used to adhere the strobe to the disc.
Move the function lever to the play position.
Look at the strobe after a picture has appeared on the TV.
If the turntable is up to speed and synchronized, the black and white wedges will be stationary.
If the turntable Is not up to speed or synchronized, two basic symptoms will be seen on the strobe.
а. Black and white wedges continuously move clockwise or counter-clockwise. Turntable is not running at 450 RPM.
Synchronizer Is not operating at ail (missing magnetic strip or not magnetized, etc.) or the free speed is well outside
the pull-In range of the synchronizer. (Clockwise rotation means speed is greater than 450 RPM and counter-
clockwise means speed Із less than 450 RPM.)
b. Black and white wedges remaln statlonary for short periods of time (may be a few seconds to a few minutes).
Movement of the wedges will correspond to the loss of color or the loss of horizontal sync on the TV picture. Only
during loss of color or loss of horizontal sync will wedges show movement. (Clockwise movement of the wedges
mean speed Із increasing and counter-clockwlse movement of the wedges means speed is decreasing.)
If movement of the wedges is noted, appropriate repairs must бе made to the player.
Remove the service strobe. Never leave the service strobe on the disc when inserting the disc in the caddy. This may
damage the lip seal on the caddy. Also, if you leave the service strobe on the disc, the next time you use the disc, the
Strobe may be placed between the turntable and the disc. This may result in the loss of conductivity between the disc
and the spindle. Loss of conductivity could damage the stylus from a static discharge.
Replace the access door.
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