Mechanical Adjustments - RCA SelectaVision VideoDisc SFT 100 Service Data

СЕО-1
MECHANICAL ADJUSTMENTS
Stylus Set Down Adjust
With player connected to monitor:
1.
2.
4.
Insert test disc (Stock No. 149235) in player.
Place Function Switch in "Play" position.
Check monitor TV display. Stylus must land so that display on
monitor reads "X" x 5 seconds.
NOTE: "X" is nominal landing time (in seconds) for each
test disc. The exact value of "X" (seconds) depends
on the diameter of the first groove on the Test Disc.
The diameter (in inches) of the first modulated
groove is marked on each Test disc caddy label.
Use the following formula to determine the exact
value of "X" in Seconds.
"X" = (diameter of first modulated groove — 11.483
inches) (642)
EXAMPLE:
UX" = (11.558" – 11.483" (642)
.075) (642)
= 4B.150 seconds.
If monitor displays 51 seconds as setdown time.
Stylus setdown would be within the required 3: 5 sec-
ond setdown time and would require no adjustment.
Adjust landing screw (Fig. 3-1) and recheck set-down as nec-
essary.
NOTE: Landing screw is an allen head set screw (.078") ac-
cessable through hole in rear of cabinet. When
replacing arm assembly or stylus cartridge it is ad-
visable to first adjust screw inward approximately 2
to 3 turns (1 turn = approximately 1 minute play time)
then adjust screw out to proper stylus landing posi-
tion.
Landing :
Screw
* Adjust
Fig. 3-1, Landing Screw Adjust
Slider Cam Adjust
Proper positioning of the slider Cam is extremely important. It is
the main mechanical timing adjustment on which all other
mechanical adjustments are based. Therefore this adjustment
must be checked or performed prior to all other mechanical ad-
justments.
1.
2.
Place function lever in "Load" position.
Loosen 1/4" hex head screw in slider cam actuating pivot arm
(Fig. 3-2).
SLIDER CAM
PIVOT ARM
Fig. 3-2. Slider Actuating Pivot Arm
3. Position pivot arm so that the turntable shaft follower (item
24) is approximately 1/16 of an inch from the end of the slider
Cam (item 31). lowest level. Tighten hex head screw in pivot
arm (Fig. 2-13).
4. Place function lever in "PLAY" position. Check that turntable
shaft follower is resting on the flat surface (highest level) of
the slider Cam (item 31). The turntable shaft follower (item 24)
must not rest оп the slope portion of the slider Cam (item 31)
in either the "LOAD" or "PLAY" mode.
Caddy Entry Door Adjust
1. Place function lever in "LOAD" position.
2. Loosen 1/4" hex head screw in caddy door actuating pivot
arm (item 14) Figs. 3-3 & 2-13.
3. Position pivot arm so that caddy door (item 51) just clears
caddy entry. Tighten 1/4" hex head screw.
4. Place Function lever їп "PLAY" position. Check that caddy
entry door (item 51) blocks caddy entry.
5. Place Function lever in "OFF" position. Caddy entry door
should travel an additional 1/16" (approximately) to com-
pletely block caddy entry opening without binding.
CADDY DOOR
ия PIVOT ARM
Fig. 3-3. Caddy Door Actuating Pivot Arm
ANTENNA PUSH ROD CAP ADJUST
With cabinet bottom removed:
1. Place function switch lever in "off" position.
2. Loosen Allen set screw (.050") (item 35) in antenna push rod
cap (item 34). Position push rod cap so that antenna switch
(on PW3000 circuit board assembly) just bottoms out.