GARRARD RC70 Audio Schematics Service Instruction Manual
- June 1, 2024
- GARRARD
Table of Contents
GARRARD RC70 Audio Schematics Service
Instruction
Fig. 4—Details of the pick-up control rear, centre spindle and record
platform
To neatly unscrew the nuts on the three suspension springs, which secure the motor to the unit plate, remove the motor away from the unit plate, drawing the suspension of steel and rubber washers onto each suspension screw.
Pick-up Dropping Position
The pick-up arm has been finely adjusted, so that the needle comes onto 10-in. records in a 9-in. diameter circle and 12-in. records in a 11-in. diameter circle. Adjusting screw—accessible through a hole in the unit plate (A and 129)—should be turned with the changer in its start position, that is, with the pick-up arm on its rest. A quarter of a turn in either direction gives maximum adjustment.
Should pick-up arm have been forced out of position and the adjustment provided by the screw be insufficient, operate the changer and allow it to switch off automatically. When the pick-up arm will be locked on or near the rest, loosen the hexagonal headed screw 200 (do not attempt to turn the nut)—when the pick-up arm will be free, place arm centrally on rest and retighten the screw. Pick-up should now be in the correct position and any fine adjustment can be made with pick-up adjusting screw.
Pick-up Height can be adjusted by loosening the eccentric securing the eccentric 191 and adjusting the eccentric pivot with screwdriver in slot at back. Finally, retighten locking nut.
Caution. When making adjustments to the pick-up arm it should never be forced into position. If the turntable is turned by hand it should not be turned backward. If the pick-up does not run onto the record grooves after alighting on the record edge, see that the record changer is level by placing a spirit level on a record on the turntable. Make sure that the flexible wire leading to the pick-up is not twisted or held in such a manner as to prevent the free movement of the pick-up arm; also see that the associated levers are free.
Auto-trip Mechanism is set to operate when the needle reaches a 10-in. radius, or if it oscillates in an eccentric groove. If occasionally records having a smaller or larger radius at the end of the playing grooves are encountered, it is desired to adjust the mechanism to take these exceptional records to be screwed. B, visible through hole in unit plate, should be adjusted.
To make the trip operate earlier for larger radius records loosen the screw, and holding pick-up arm steady, move screw in a steady wise towards turntable. The screw should be moved a barley noticeable amount at each adjustment.
If an early model in which the draw plate 111 is missing and the pawl pivot is attached directly to the pick-up lever 173 has a tendency to trip prematurely on records that are eccentric (swingers), carefully polish corner of impulse lever 43 that engages on cam in trip receiver 106 and strengthened slightly adjusting 105. Also stretch pawl spring 176 to weaken it.
To Repair Sporn Adjustment. To set the platform, the nut 156 locking the eccentric should be loosened, and with mechanism set for 12-in. records pick- up arm in the playing position, and the largest “eccentric adjustable loaded on platform, turn the than 1 in. record available” until there is a gap of not more than 1/64 in. between the edge of the record and the locking edge of the platform pawl. Finally, retighten and fine rout nut 156.
Auto Stop at End of Last Record. When the last record on the platform drops on to the turntable it allows the record clip to fall and this unlocks the auto stop, which should switch off the motor at the end of the record clip. If, when the last record has been played, the record stop has fallen and the mechanism does not automatically stop, the following procedure should be carried out.
Locate swing lever 42 and knock-off extension 163. Note that in the upper edge of the knock-off extension there is a step. With the record replaced, lower the arm and needle removed from the pick-up head, start the changer with a hand on the turntable and slow it down to the slowest possible speed at which the mechanism will operate. Move the control lever to the “Reject” position. Swing lever 42 should now move outwards until it engages step on knock-off extension, and should remain engaged until record changer switches off. If swing lever does not engage step but passes over it, proceed as at (a) to correct. If it engages in step, set as at (b).
- (a) Load two records on platform spindle in the usual way. Lower record clip and start changer. First record will now drop on to turntable, leaving one remaining on the platform. Again, with the hand operating as a brake to slow down turntable, move control lever to “Reject” position. The tip of the step on knock-off extension should now clear the surface of the swing lever in its outward movement by 1/64 in. If this dimension is incorrect, stop the changer when the swing lever is directly over step in knock-off extension. Knock-off adjusting screw 160, Knock-off lever 163 by adjust 159 and extension is attached to loosen the screw to rivet and keyhole of the extension until 1/64 in. clearance is obtained, then retighten screw. Finally, re-check changer with record clip lowered to ensure that swing lever engages step. Should auto stop fail to operate, set as at (b) below.
- (b) Loosen screws 89 and bring the two parts of the trip link 90 together so that upon slightly the effective length and retighten the screws. Check and repeat adjustment if necessary until changer operates correctly.
Pick-up slides across 10-in record and rejects without playing. This is due to the gap between swing lever and catch on knock-off extension being set too fine and the adjustment described at (a) above should be carried out.
Pick-up commences at varying distances. The fault can be due to two causes. Firstly, ascertain that the spring is marked C is present in the changer. If spring corresponding to the fault is probably due to pick-up arm lifting too high when it returns to the rest after playing a record, and to check this stop the motor when pick-up arm is halfway back towards the rest after 10 records have been played. In this position, with a 4-in. long needle in the pick-up, the tip of the needle should be just clearing the surface of top record.
If clearance is greater, it indicates the mechanism is lifting arm too high, and to correct it, loosen locking nut on back of eccentric pin 191 and turn pin by means of slot in the end opposite to nut until pick-up is at the correct height, then retighten nut.
If the spring mentioned above is not fitted it may be obtained from the Garrard Service and Spares factory. Pick-up alights on record and immediately rises again, until drops next record without playing process through all records on platform, and repeats the any. When unit is in playing position with the needle being on the record, there should be a slight amount of play in lever 164 discernible as a movement between pin 49 and end of slot in lever 164. If no movement is present, slightly adjust eccentric pin 164 to produce it.
There should be a clearance between the end of reject lever 82 and trip lever 106. If not, gently bend reject lever 82 slightly away from trip lever 106.
Occasionally, due to either spring 105 being weak, or to trip lever 106 being stuck on its pivot, the impulse to lever 43 does not engage slight inside trip lever but moves back in the give the pin on the cam the impulse to recommence to changing cycle, in which case free trip lever and strengthen spring as necessary.
Specifications
| Feature | Specification |
|---|---|
| Pick-up Arm Adjustment Diameter | 10-in. records in a 9-in. diameter circle |
12-in. records in a 11-in. diameter circle
Adjusting Screw Access| Through a hole in the unit plate (A and 129)
Height Adjustment Component| Eccentric securing the eccentric 191
Auto-trip Radius| 10-in. radius or oscillation in an eccentric groove
Record Clip Function| Unlocks the auto stop when the last record drops
Reject Mechanism Adjustment| Clearance of 1/64 in. between swing lever and
step on knock-off extension
FAQ
How do I adjust the pick-up arm dropping position?
The pick-up arm’s dropping position can be adjusted by using the adjusting screw accessible through a hole in the unit plate when the changer is in its start position.What should I do if the auto-stop does not operate correctly?
First, ensure that swing lever 42 engages with the step on the knock-off extension when the control lever is set to the “Reject” position. If necessary, adjust the knock-off adjusting screw 160, and check the effective length of trip link 90.What could cause the pick-up to start playing at varying distances?
This could be due to a missing spring marked C or the arm lifting too high. Stop the motor halfway through the return cycle and check the needle clearance. Adjust the eccentric pin 191 if necessary.