Nikon NR-5500 Manuale di riparazione - Pagina 11

Sfoglia online o scarica il pdf Manuale di riparazione per Strumenti di misura Nikon NR-5500. Nikon NR-5500 25. Auto refractometer

_TEST PROGRAM

@ TEST - 04 : Turning on the C. LED (Calibration LED) and M. LED (Main LED)

Press this

key to quit

TEST-04.

• Turning on the C. LED: Press the [CLED OFF] key to change the display into

[CLED ON], and the C. LED will light up. This mode is used to check the CHA and

CHB signals.

• Turning on the M. LED: Press the [MLED OFF] key to change the display into

[MLED ON], and the M. LED will light up cotinuously. This mode is used to adjust

the position of the M. LED.

(5) TEST - 06 : Displaying the CHA and CHB phase count offsets and the CHA - FIL

and CHB - FIL signal peak values

Press this

key to quit

TEST-06.

• Displaying the CHA and CHB phase count offsets

This test displays the digital read - out of the phase difference offset after A/D

conversion is made when the C. LED is on. Make sure that the following readings

are observed:

Offset: - 00200 to +00200 ;

Variation: 0010 or less

• Displaying the CHA - FIL and CHB - FIL signal peak values

This test displays the digital read - out of the peak values of the CHA - FIL and

CHB - FIL signals after A/D conversion is made when the C. LED is on.

CHA: 150 to 200 ; CHB: 150 to 200

Adjust VR7 CAL until the reading of the CHA - FIL and CHB - FIL peak values

falls between 150 to 200.

(it is advisable that this adjustment be carried out during TEST - 0D)

• 0V display: Make sure that the level measured is 000. If read - out is not 000, the

A/D converter is damaged.

C6 - 51

Repair Manual