ABBERFIELD CT22 Series Technical & Service Manual - Page 5

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ABBERFIELD INDUSTRIES - CT22 coin time switch TECHNICAL DETAILS

Coin

Diameter

Minimum

The normal calibration procedure is all that is

ever needed and the following information is

for special circumstances only.

Sometimes there is a desire to vary the standard

calibration criteria, to invalidate a closely matched

fraudulent coin or increase the certainty of correct

validation of closely matched coins. Understanding

the calibration criteria and recording set values in

a table will allow evaluation of the equipment's

operation and from this it can be seen where

adjustments to the calibration criteria will help in

achieving a particular result. First understand that

there are three measurements being taken for

each coin, (optical detection of diameter and

"induced" electronic readings referred to as

amplitude and period. For each of these parameters

there is a reference number that is set into the coin

validator calibration tables. It is possible to write up

a table indicating these readings.

Follow steps 1. to 7. from the calibration

procedure and bring the desired coin on to

the screen.

Press the SET button this will show the first

entry of the coin table, it should be between

3000 and 7500.

Enter the displayed values for all coins in the

table provided, this will then help to show how

far each parameter can be adjusted before

overlapping another coin and possibly

causing miscredits. Also if any adjustments

made to parameters cause problems then

you have a record of the original values that

you can enter back into the validator.

To move to the next coin parameter press the

NEXT button.

After all parameters for that coin have been

displayed the screen will return to C1-C8.

To advance to the next coin press the NEXT

button.

To display parameters for the coin press the

SET button.

32 Cross St, Brookvale, Sydney NSW 2100, Australia

Adjusting Calibration

Period

Maximum

Minimum

Tel: (02) 99392844 Fax: (02) 99383462 Email: [email protected]

page 5

Amplitude

Maximum

Minimum

Repeat steps 3 to 7 until all coins have been

recorded.

An overlap in all 3 parameters (diameter,

period and amplitude) between 2 or more

coins will cause miscredits of coins which

fall into these parameters, but ONLY if they

occur simultaneously.

10. To change parameter press the SET button

while that parameter is on the screen. The

last digit (right side) will flash, this is the digit

that can be adjusted.

11. To advance the value of the flashing digit

press the NEXT button. The digit can then be

scrolled from 0 to 9 and back to 0.

12. To move to the next digit press the SET

button.

13. Repeat for all digits and once the first digit

(left side) is flashing then pressing the SET

button. The display will return to the coin

number, C1-C8.

14. Press the NEXT button to advance to the next

coin and repeat steps 10 - 13 to change other

coin parameters.

15. After adjusting the desired parameters make

sure the screen is showing a coin number C1-

C8. Remove power to the validator.

16. Set the dip switches to their normal operating

positions and re-apply power.

17. Test the validator to see if the adjustments

made do not cause problems with any of the

coins normally used.

NOTE: Some time a difficult fraudulent coin can be

"calibrated" so as to record its reference numbers

(Diameter Period and Amplitude). Then the

validator is recalibrated to remove the fraudulent

coin details, but the numbers taken can be used to

determine how best to adjust the Diameter Period

and Amplitude readings for the valid coin set.

Brochure # 1003-4

Maximum