Troubleshooting; Clock Adjustment - Clarion VRX630 Service Manual

TROUBLESHOOTING

Problem
Nothing happens when
buttons are pressd.
Display is not accurate.

CLOCK ADJUSTMENT

1. Press the ADJ button to display the adjustment selec-
tion display.
2. Move the JOYSTICK up or down to select CLOCK,then
press ENT at the center of the JOYSTICK to display the
clock adjustment display.
3. Move the JOYSTICK left or right to select HR or MIN,then
move the JOYSTICK up or down to adjust the time.
The time is displayed in 12-hour format.
4. Pressing ENT at the center of the JOYSTICK when the
cursor is above HR or MIN saves the adjusted value in
memory and simultaneously returns the display to the
previous display(adjustment selection display).
To cancel clock adjustment before completion,use the
JOYSTICK to move the cursor to MENU,then press ENT
at the center of the JOYSTICK.
ADJUSTMENTS
Dot clock adjustment(at Digital PWB)
1. Turn the screen on,and connect TP601(TEST) to GND.
2. Adjust TC601 so that the reading of the frequency counter
at TP602(VSYNC) is 12.00MHz+0.01/-0.02MHz.
DC-DC converter output voltage adjustment
(at LCD PWB)
1. Adjust VR701 so that the voltage of TP703 is 5.05+0.05/
-0.052V.
2. Make sure the voltage has become the following value
at each test point.
TP702 : 7.5+0.5/-0.5V
TP704 : 18.5+1.0/-1.0V
TP701 : -15.5+1.0/-1.0V
Frequency of IC706 adjustment(at LCD PWB)
1. Adjust VR708 so that the frequency of TP712 is 144kHz.
VIDEO signal adjustment(at LCD PWB)
Input the visual signal(10step wave,monochrome,APL=50%,
1.0Vp-p)to the VIDEO input.
10step wave
VOLTS/DIV=0.1V(10:1PROVE)
V
BB
3
2
1
0
1. BRIGHT voltage confirmation(NTSC mode)
Make sure the voltage of TP706 is 1.88+0.1/-0.1V.
2. RGB-AMP/CONT-G adjustment(NTSC mode)
Adjust VR707(RBG AMP) so that VBB voltage of TP710
Cause Measure
The microprocessor Turn off the power,then press the RELEASE lever
has malfunction due to and remove the DCP.Press the Reset button for about
noise,etc. 2 seconds with a thin rod.
A.B TIME/DIV=10usec.
10
9
8
7
6
V
5
BW
4
GND
Fig.1
is 4.0+0.5/-0.5V.
Adjust VR703(CONT) so that VBW voltage of TP710 is
3.8+0.05/-0.05V.
3. BRT-R Adjustment(NTSC mode)
Adjust VR705(BRT-R) so that VBB voltage of TP711 is
4.0+0.05/-0.05V.
4. BRT-B Adjustment(NTSC mode)
Adjust VR706(BRT-B) so that VBB voltage of TP709 is
4.0+0.05/-0.05V.
5. COM-AMP adjustment(NTSC mode)
Adjust VR704(COM-AMP) so that the amplitude of TP705
is 6.7+0.1/-0.1Vp-p.
6. Burst cleaning adjustment(PAL mode)
Input a color ber signal.
Adjust L709 so that the wave form of TP709 is in focus.
Burst cleaning
VCOM DC bias adjustment
Adjust VR702(VCOM DC) to obtain the optimum contrast.
EXPLANATION OF IC
M30624MGA-173GP 052-6043-40
AV Center System Controller (Tuner, LCD panel, Ce-NET)
1.Terminal Description
pin 1 : LCD COLOR
pin 2 : LCD HUE
pin 3 : IR IN
pin 4 : AMP REM OUT : O : Amplifier ON signal output terminal.
pin 5 : NU
pin 6 : BYTE
pin 7 : CNVSS
pin 8 : SUB CLCK I
pin 9 : SUB CLCK O
pin 10: RESET_
pin 11: X OUT
pin 12: VSS
pin 13: X IN
pin 14: VCC
pin 15: NMI
pin 16: ACC DET
pin 17: B/U DET
pin 18: OPEN/CLOSE
pin 19: 27pinCONNECT : IN : IE bus data detect.
pin 20: ACC +B ON
pin 21: AV 5V ON
pin 22: NU
pin 23: PANEL ON
pin 24: BRT
pin 25: NU
pin 26: IR OUT
- 3 -
Reset button
Fig.2
: O : Color control signal output to LCD panel.
: O : Hue control signal output to LCD panel.
: IN : Signal input from Remote controller.
: IN : Not in use.
: IN : Connect to ground.
: IN : Connect to ground.
: IN : Crystal connection for sub clock.
: O : Crystal connection for sub clock.
: IN : Reset signal input. Negative logic.
: O : Crystal connection for main clock (10MHz).
: - : Ground.
: IN : Crystal connection for main clock (10MHz).
: - : Positive supply voltage.
: IN : Not in use.
: IN : ACC ON signal input.
: IN : Backup voltage ON signal input.
"L"=Backup OFF.
: IN : Open/close key input.
: O : LCD back light ON signal output.
: O : 5V power supply ON signal output.
: O : Not in use.
: O : LCD panel power on signal output.
: O : LCD panel brightness control signal output.
: IN : Not in use.
: O : Signal output to Remote controller.
VRX630