Adjustments; Power Supply Voltage Adjustment; Free-Run Frequency Adjustment; Bright Voltage Adjustment - Clarion MAX668RVD Service Manual

ADJUSTMENTS

* Refer to the printed wiring board(page 37) for the ad-
justment points and VRs.
* The NTSC composite output signal of the signal gen-
erators is performed with the following output.(Video in-
put of visual mode)
Video signal: 714 +/-17.5mV
Synchronized signal: 286 +/-7.5mV

Power supply voltage adjustment

Input signal: NTSC / COMP: 10-steps signal / Monochrome
/ DIMMER 100% / Measuring instrument: digital volt meter
1. Adjust VR600 so that the voltage of TP710 is 5.30+0.02/
-0.02V.
2. Confirm the following voltages.
TP709 : -17.0+0.8/-0.8V
TP711 : 7.5V+0.5/-0.5V
TP713 : 15.0V+0.8/-0.8V

Free-run frequency adjustment

Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
frequency counter and digital volt meter
1. Connect TP40 to GND, and adjust VR401 so that the
frequency of TP42 will become 15.734kHz+50/-50Hz.
2. Confirm the following voltages.
TP46 : 2.58V+0.15/-0.15V

BRIGHT voltage adjustment

Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
digital volt meter
1. Adjust VR705 so that the voltage of TP708 will become
2.00V+0.02/-0.02V.
RGB-AMP adjustment (black-black)
Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
oscilloscope
1. Adjust VR707 so that the black-black level of the wave-
form of TP716(G) will become 4.0V+0.1/-0.1V.
Black
Withe
Black
Contrast adjustment (black-white)
Input signal: NTSC / COMP: 10-steps signal / Monochrome
/ APL 50% wave form / With composite screen display /
BRT,COL,HUE: Initial setting of touch panel microcomputer
/ Measuring instrument: oscilloscope
1. Adjust VR702 so that the black-white level of the wave-
form of TP716(G) will become 3.8V+0.1/-0.1V.
3.8V+0.1/0.1V
White balance pre-adjustment
Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
oscilloscope(DC range)
MAX668RVD
4.0V+0.1/0.1V
Withe
Black
Withe
Withe
Black
1. Set the range of CH1 and CH2 of an oscilloscope to 1V
range.
2. Indicate CH1 and CH2 by GND,adjust GND as follows.
White balance red adjustment
Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
oscilloscope(DC range)
1. Display the waveform of TP716 on CH1, and display the
waveform of TP715 on CH2.
2. Adjust VR703 so that the waveform of TP715 will be-
come the same as TP716.
White balance blue adjustment
Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
oscilloscope(DC range)
1. Display the waveform of TP716 on CH1, and display the
waveform of TP717 on CH2.
2. Adjust VR704 so that the waveform of TP717 will be-
come the same as TP716.
VCOM AC adjustment
Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
oscilloscope
1. Adjust VR701 so that an amplitude of a waveform of
TP705 is 8.0V+0.1/-0.1V, and confirm that there is no
distortion in the waveform.
Display position adjustment
Measurement conditions: the same conditions as the ad-
justment of "Power supply voltage". / Measuring instrument:
oscilloscope
1. Adjust VR402 so that the pulse width of TP42 is "5.4+0.1/
-0.1u sec.".
- 4 -
CH1
CH2
8.0V+0.1/0.1V