Clarion VRX925VD Service Manual page 7

ADJUSTMENTS
Main unit section
DC-DC converter output voltage / PLL output voltage adjust-
ment
Condition:
Function : VISUAL mode
Tuner amp unit : Input NTSC color bar video signal
1. Adjust VR150 so that the voltage of TP152 is
5.35V(+0.02V/-0.02V).
2. Adjust VR101 so that the voltage of TP105 is 1.6V(+0.1V/
-0.1V).
LCD PWB section
Power supply voltage confirmation
1. Make sure the voltage has become the following value
at each test point.
TP708 : 5.3V(+0.5V/-0.5V)
TP709 : 7.5V(+0.5V/-0.5V)
TP710 : 13.0V(+0.5V/-0.5V)
TP707 : -16.0V(+0.5V/-0.5V)
PLL adjustment
1. TP717 connect to GND. Confirm that the TP716 voltage
is 2.65V(+0.1V/-0.1V).
2. Adjust VR707 so that the frequency of TP718 is
15.734kHz(+50Hz/-50Hz).
Screen position adjustment
1. Adjust VR708 so that the pulse width of TP718 is 4.6u
sec(+0.1u sec./-0.1u sec.).
Voltage confirmation of J702 connector
VGH(pin32) : 13.0V(+0.5V/-0.5V)
VCC(pin24) : -11.0V(+0.5V/-0.5V)
VGL(pin18) : -8.4V(+0.5V/-0.5V)
VSH(pin1,pin3) : 5.3V(+0.5V/-0.5V)
VIDEO signal adjustment
(step 1 to 7 :NTSC, step 8 :PAL)
Input the visual signal(10step wave,monochrome,APL=50%,
1.0Vp-p)to the VIDEO input.
1. BRIGHT voltage confirmation
Make sure the voltage of TP701 is 2.00V(+0.1V/-0.1V).
2. GAMMA 0 voltage confirmation
Make sure the voltage of TP705 is 1.95V(+0.1V/-0.1V).
3. GAMMA 2 voltage confirmation
Make sure the voltage of TP706 is 2.15V(+0.1V/-0.1V).
4. RGB-AMP/CONT-G adjustment
Adjust VR705(RGB AMP) so that VBB voltage of TP712
is 4.0V(+0.05V/-0.05V).
Adjust VR701(CONT) so that VBW voltage of TP712 is
3.8V(+0.05V/-0.05V).
5. BRT-R Adjustment
Adjust VR703(BRT-R) so that VBB voltage of TP713 is
4.0V(+0.05V/-0.05V).
6. BRT-B Adjustment
Adjust VR704(BRT-B) so that VBB voltage of TP711 is
4.0V(+0.05V/-0.05V).
7. COM-AMP adjustment
Adjust VR702(COM-AMP) so that the amplitude of TP714
is 8.0V(+0.1V/-0.1V p-p).
8. Burst cleaning adjustment
Input a color bar signal.(PAL)
Adjust L702 so that the wave form of TP711 is in focus.
VCOM DC bias adjustment
1. Adjust VR706(VCOM DC) to obtain the optimum
contrast(CINEMA MODE).
Voltage/frequency confirmation of inverter section
TP901 : 5.0V(+0.5V/-0.5V)
TP902 : 53kHz(+5kHz/-5kHz)
EXPLANATION OF IC
051-6441-00 ES4408
1.Terminal Description
pin 1: VCC
pin 2: LA 4
pin 3: LA 5
pin 4: LA 6
pin 5: LA 7
pin 6: LA 8
pin 7: LA 9
pin 8: VSS
pin 9: VCC
pin 10: LA 10
pin 11: LA 11
pin 12: LA 12
pin 13: LA 13
pin 14: LA 14
pin 15: LA 15
pin 16: LA 16
pin 17: VSS
pin 18: VCC
pin 19: LA 17
pin 20: LA 18
pin 21: LA 19
pin 22: LA 20
pin 23: LA 21
pin 24: RESET
pin 25: TDM DX/RSEL :I/O: TDM transmit data output. ROM select
pin 26: VSS
pin 27: VCC
pin 28: TDM DR
pin 29: TDM CLK
pin 30: TDM FS
pin 31: TDM TSC
pin 32: TWS/SEL PLL1 :I/O: Audio transmit frame synchronous pulse
pin 33: TSD0/SEL PLL0 :I/O: Audio transmit serial data output. Select
pin 34: VSS
pin 35: VCC
pin 36: TSD1/SEL PLL1 :I/O: Audio transmit serial data output. Select
pin 37: TSD 2
pin 38: TSD 3
pin 39: M CLK
pin 40: TB CK
pin 41: SPDIF DOBM
pin 42: NU
pin 43: VSS
pin 44: VCC
pin 45: RSD
pin 46: RWS
pin 47: RBCK
pin 48: A PLL CAP
pin 49: X IN
pin 50: X OUT
pin 51: VCC
pin 52: VSS
pin 53: DMA 0
pin 54: DMA 1
- 7 -
DVD Processor
: - : Positive supply voltage.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: - : Negative supply voltage.
: - : Positive supply voltage.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: - : Negative supply voltage.
: - : Positive supply voltage.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: O : Device address output.
: IN : Reset signal input.
input.
: - : Negative supply voltage.
: - : Positive supply voltage.
: IN : TDM receive data input.
: IN : TDM clock pulse input.
: IN : TDM frame cynch.
: O : TDM output enable.
output. Select PLL input.
PLL input.
: - : Negative supply voltage.
: - : Positive supply voltage.
PLL input.
: O : Audio transmit serial data output.
: O : Audio transmit serial data output.
: O : The clock puse output to the CD IC.
:I/O: Audio transmit bit clock.
: O : S/PDIF format output.
: - : Not in use.
: - : Negative supply voltage.
: - : Positive supply voltage.
: IN : Audio receive serial data.
: IN : Audio receive frame synch.
: IN : Audio receive bit clock.
: IN : Analog PLL capacitor.
: IN : Crystal connection.
: O : Crystal connection.
: - : Positive supply voltage.
: - : Negative supply voltage.
: O : DRAM address output.
: O : DRAM address output.
VRX925VD