SERVICE MANUAL
Checkout and adjustment
RTG PLUS (120V) (Rev. 0)
7-8
7.2.4
7.2.47.2.4
7.2.4
Potentiometer replacement/calibration
Potentiometer replacement/calibrationPotentiometer replacement/calibration
Potentiometer replacement/calibration
The procedure here after described, allows to store into the system non-
volatile memory the resistance values of the potentiometer (then
converted by the A to D Converter) when the tube-head is in the starting
position (0°) and final position (245°).
In this way, the system can continuously detect the angular position of
the arm by reading the value of the potentiometer attached to the
mechanics.
NOTE 1:
The following procedure must be started with the machine OFF and
cable X1 disconnected.
NOTE 2:
The following procedure, often requires to access the set-up programs;
access to the programs is achieved as follows:
a while holding the "s" (39) button depressed, turn the unit ON and do
not let go until the unit has gone through its check out mode which
will be signalled by 2 distinct sounds, one short and one long;
thereafter, the display would be blank
b press keys 37, 34, 29 in sequence (small, child, TMJ1 buttons); the
display will remain still blank
c Now the following keys, with the relevant functions, are active:
• "s" (39) to change the value of the "software DIP-switches" (S0 to
SB)
• "R" (32) to restore the default parameters of the non-volatile
memory
• "T" (31) to calibrate the circuit associated to the potentiometer of
the rotating arm.
Selection of the desired option is described within the procedure.
1. With the unit OFF, loosen the clutch of the belt motor.
2. Manually move gently the rotating arm to the 0° position, until
reaching the relevant microswitch S2 (see Figure 7-4 page 7-20).
3. Check the value of the new potentiometer to install (5kΩ, 10kΩ or
20kΩ).
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