JRC JMA-2343 User Manual

246
9.7 Adjustment Procedures
9.7.1 General adjustments
1. Adjustments to be made when a part is replaced
1. Adjustments to be made when a part is replaced1. Adjustments to be made when a part is replaced
1. Adjustments to be made when a part is replaced
Adjustments need to be performed when major parts of the radar unit. are replaced.
(a) When the V101 magnetron is replaced Tuning
(b) When the E101 front end is replaced Tuning
(c) When the V901 Cathod-ray tube is replaced
＊
Off center adjustment
When the CRT monitor PCB is replaced
Brilliance level adjustment
Focus adjustment
＊: When exchanging V901 (CRT), the Direction coil implement in the stuck condition.
Incidentally, It is possible to arrange in cathode-ray tube monitor chassis (CKJ-159)
2. CRT monitor off center adjustment
2. CRT monitor off center adjustment2. CRT monitor off center adjustment
2. CRT monitor off center adjustment
(a) This adjustment must be performed on the centering magnet (permanent magnet)
located immediately behind the deflection coil. This permanent magnet is made up of
two doughnut-like disks.
(b) Turn the centering knob so that the neck of the Cathod-ray tube is in alignment with the
center of the PPI screen.
3. Adjusting the brilliance level of the CRT monitor screen.
3. Adjusting the brilliance level of the CRT monitor screen.3. Adjusting the brilliance level of the CRT monitor screen.
3. Adjusting the brilliance level of the CRT monitor screen.
(a) Set the brilliance level of the CRT monitor screen to its maximum from the menu.
● Please refer to "3.2.1 Changing the brightness of the screen" for the method of ad-
justment.
(b) Turn potentiometer R451 on the CRT monitor PCB so that no raster appears in the
non-displayable area. (Turn the potentiometer slowly since the circuit's sensitivity is
very high.)
4. Adjusting the focus of the CRT monitor screen
4. Adjusting the focus of the CRT monitor screen4. Adjusting the focus of the CRT monitor screen
4. Adjusting the focus of the CRT monitor screen
(a) Turn potentiometer R951 on the neck PCB in the display unit so that the range rings
and video images appear most clearly.

JRC JMA-2343 Specifications

General

Brand	JRC
Model	JMA-2343
Category	Marine Radar
Language	English