General Instruments Corp. 205 Schematic

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Product Information:
Manufacturer:General Instruments Corp.

Schematics Content:

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The Model 205 Record Changer is an automatic cam type changer, featuring Single Button Control and Eccentric Spindle Record Selection.

OPERATION Starting... After the Switch Button Control (6) has been turned ON, thus supplying power to rotate the turntable, automatic cycling may be started by depressing the button. This movement pushes the Trip Bar (14) forward, causing engagement with the Carrier Lever 127) and its attached Drive Wheel (10). The latter thus contacts the rim of the turntable and rotates with it. This motion is transmitted through the Drive Spring (16) to the Worm Drive (17), which in turn drives the Main Cam (15).

Cycling... A single revolution of the Main Cam (15) results in complete automatic cycling of the changer. This includes selection of record from stack, lifting Pick - Up Arm (1) from rest position and setting needle on edge of record. Upon completion of the revolution. the Automatic Trip Cam (26) engages with the block on the Trip Lever (34) and pulls the Carrier Lever (27) back to its original position so that the Drive Wheel (10) is no longer engaged with turntable rim.

Record Feed... The lower side of the Main Cant (15) controls record selection. Motion of the Feed Cam Roller (32) about the can results in a backward and forward movement of the Feed Sector Lever (19) thus engaging the Record Feed Pinion (20). This in turn causes the Eccentric (35) to first rotate to the proper position for record selection and to then return, allow. ing record to drop over Spindle (3).

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Pick - Up Arm Movement... The upper side of the Main Cam (15) controls Pick - Up Arm (1) movement. Lift is effected by motion of the Lift Pin (23) along the vertical edge of the cam as the latter rotates. Direc: tion is controlled by engagement of the Main Cam (15) with the Sweep Lever Pinion (25). The Sweep Lever (29) is attached to the Pick - Up Arm (1) by means of a Clamp (24) around Pick - Up Arm Pivot Sleeve (30). A boss projecting from the upper side of the Main Cam (15) displaces the Stop Lever (28) at the end of the change cycle, thus permitting the Pick Up Arm to proceed across the record.

Positive Trip Action... As the Pick - Up Arm ap. preaches the Spindle (3), the Sweep Lever (29) hits the Positive Trip Screw (31) mounted on the Trip Lever (34). This action re-engages the drive wheel with the turntable rim and starts a new cycle.

Ten Inch or Twelve Inch Operation... Adjusting the Record Support (4) to the ten inch or twelve inch position lowers the Selector Rod (33) a definite degree. The length of the extension of this rod determines the positioning of the Stop Lever (28). The latter is the means of regulating the distance the Sweep Lever (29) and its attached Pick - Up Arm (1) travel before the Pick - Up Arm (1) is lowered to the edge of the record. (Operation of this feature is dependent on proper positioning of Record Support (4). Always turn Record Support (4) to full stop.)

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Changer trips before completion of record:
Turn Positive Trip Screw 131) clockwise.

Changer fails to trip after completion of record:
Turn Positive Trip Screw (31) counter clockwise.

Drop point of Pick - Up Arm (1) is not at proper point on record:
Loosen screw on Sweep Lever Clamp (24) slightly and reposition Pick - Up Arm (1) with respect to Sweep Lever (29).

Slow turntable speed:
Make sure Drive Wheel (10) does not strike rim of turntable. If necessary, re adjust eccentric bushing on Drive Wheel (10). (Note: this adjustment should be exceedingly slight as a large movement may cause continuous trip.)
Check for grease or oil on Idler Wheel (19) of Motor (11) and inside of turntable. Wipe with carbon tetrachloride.
Check for sticky Idler Wheel (91 plate on Motor (11). Free with screw driver.

Stalls in Cycle:
Remove any grease on Drive Wheel (10) or inside of turntable with carbon tetra chloride. Check mesh of Worm Drive (17) and Main Cam (15) for proper clearance. Loosen screws on main bracket and tighten. (See Figure 5.)
Check for bind in Spindle Assembly (See Figure 6). Disassemble Index Collar (22) and Record Feed Pinion (20), remove Spindle Cap (2), Eccentric (35) and eccentric rod. Check for freeness and remove binds.
The following cautions should be observed in reassembling Spindle Assembly:
(a) Reassemble with a maximum end play of. 005 between Eccentric (35) and Spindle Cap (2).
(b) The Eccentric (35) should be in line with the Spindle (3) when the changer has completed its cycle.
(c) The Feed Sector Laver (19) should mesh with the Record Feed Pinion (20) as shown in Figure 6.
(d) Align the Spindle Cap (2) with the Spindle (3) in detent position.

Records fail to drop:
Check meshing of Feed Sector Lever (19) with Record Feed Pinion (20). Reset as shown in Figure 6.

First Record does not play:
Readjust end of Lift Pin (23) so the needle will play first record. (See Figure 7.) (Note: Do not bend Lift Pin (23) too much as this will prevent playing of top record on full stack.) Make certain that pick-up lead does not hit top of Lift Pin (23) or hinge.

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