Corghi EM8540, Technical & Service Manual

11

 
If the values displayed after the spin cycle are not within the specified ranges, use the stud 
bolts to tighten down the pickups until the readings are correct. 
The correct values are usually obtained at a tightening torque of 2 Nm. 
-

Fully tighten down the locknuts and then release them slightly (about one sixth of a turn) 
to load the Belleville washers. 
During this operation, immobilize the stud bolts so as to avoid altering the pickup 
preloads. 

-

Refit the side casing and the weight-holder lid. 

-

Run a three spin cycle sensitivity calibration. 

REPLACING THE BRAKE PEDAL SWITCH 

-

Remove the side panel; 

-

unscrew the ring nuts securing the switch to its mount; 

-

disconnect the cable from the switch's terminal block; 

-

connect the cable to the new switch; 

-

fit the new switch to the mount (the position is unequivocal since no adjustment is required); 

-

tighten down the two ring nuts (nut and locknut). 

REPLACING THE ENTIRE CENTRAL UNIT 

After making sure that the unit is really the cause of the machine's malfunctions, replace it as 
described below: 
-

Remove the weight-holder lid. 

-

Remove the search circuit board complete with mount by undoing the two M8 screws 
securing it. 

-

Remove the central unit by undoing the two M12 bolts with a 19 wrench. 

-

Fit the new central unit, locating it to ensure perfect coupling between the spin unit base 
(front reference plane) and the block to which the leaf springs are mounted. Also make 
sure that the drive roller is centered on the pulley. 

-

Fit the search circuit board with its two M8 bolts, making sure that the encoder disk teeth 
can run inside the fork without collisions.  

-

Reconnect the pickup cable and the search circuit board. 

-

Close the weight-holder lid again. 

-

Run a three spin cycle sensitivity calibration. 

REPLACING THE QUICK LOCK CENTRAL UNIT PNEUMATIC CYLINDER 
GASKETS 

The cylinder gaskets 
must be replaced 
whenever there are air 
leaks or piston operation 
is defective. 

•

Remove the weight-
holder lid; 

•

Undo the two bolts 
securing the rear 
flange of the 
pneumatic cylinder; 

•

Recover the inside 
spring (B);