Read Sony DVP-CX850D Service Manual online
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1. TESTING THE BUTTON FUNCTION
Press any function button (except [POWER] of the DVP-CX850D in the test mode. Then the machine exits the FL display tube automatic
display test mode. As long the button is kept pressed, the FL display tube shows the function name of the pressed button. When hand is
removed from the button, the message [NOTHING] appears. For the function name of the buttons on the FL display tube, refer to the
following table.
display test mode. As long the button is kept pressed, the FL display tube shows the function name of the pressed button. When hand is
removed from the button, the message [NOTHING] appears. For the function name of the buttons on the FL display tube, refer to the
following table.
When any of the self-illuminating buttons (the buttons equipped with LED), every pressing of the button toggles between turning on and off.
To test the MULTI CHANNEL LED (blue LED), press the [RETURN] button because the LED does not have its corresponding button.
To test the MULTI CHANNEL LED (blue LED), press the [RETURN] button because the LED does not have its corresponding button.
The direction pointing buttons function to enter the special modes as shown below.
R: FL display tube grid check
r: LED check
T: Direct search dial check
t:FL display tube anode check
r: LED check
T: Direct search dial check
t:FL display tube anode check
All buttons are judged by the input voltage value to the A/D port. The reference voltage of the A/D port is EVER 5V. The input voltage value
is calculated with 10-bit accuracy. Only when the input voltage value agrees twice, the value is input to the A/D port in order to remove
chattering of buttons.
When the buttons of the IF controller are judged, the A/D port had a dead zone so that the message [IGNORE] appears when an input voltage
in the range of the dead zone is input.
is calculated with 10-bit accuracy. Only when the input voltage value agrees twice, the value is input to the A/D port in order to remove
chattering of buttons.
When the buttons of the IF controller are judged, the A/D port had a dead zone so that the message [IGNORE] appears when an input voltage
in the range of the dead zone is input.
2. TESTING THE REMOTE COMMANDER SIGNAL RECEPTION FUNCTION
When the machine receives the remote commander signal while [NOTHING] is displayed, the function name of the remote commander code
is displayed on the FL display tube. The machine receives the DVD category code only.
The [DISPLAY] button of the remote commander functions to switch the display between the function name display and the code display.
When the code is displayed, the message [REM NO xx] appears. The characters xx indicates the received code in the hexadecimal number.
When the remote commander signal is not received, the message [FF] appears.
is displayed on the FL display tube. The machine receives the DVD category code only.
The [DISPLAY] button of the remote commander functions to switch the display between the function name display and the code display.
When the code is displayed, the message [REM NO xx] appears. The characters xx indicates the received code in the hexadecimal number.
When the remote commander signal is not received, the message [FF] appears.
3. TESTING THE SYSTEM CONTROLLER
↔
IF CONTROLLER
SERIAL COMMUNICATION FUNCTION
The bi-directional serial communication between the system controller and the IF controller is performed normally at the rate of 24 ms. This
mode can easily check if the communication is correctly performed or not.
When the non-relief type characters such as [VIDEO CD], [DVD] and [CD] in the left of the FL display tube turn off while [NOTHING] is
displayed, it indicates that the serial communication with the system controller is correctly performed.
When these non-relief type characters turn on, it indicates that the serial communication with the system controller is not performed.
However, during the period of several seconds (until initialization of the MB board is complete) after the test mode is activated, the non-relief
type characters can turn on. This is normal.
mode can easily check if the communication is correctly performed or not.
When the non-relief type characters such as [VIDEO CD], [DVD] and [CD] in the left of the FL display tube turn off while [NOTHING] is
displayed, it indicates that the serial communication with the system controller is correctly performed.
When these non-relief type characters turn on, it indicates that the serial communication with the system controller is not performed.
However, during the period of several seconds (until initialization of the MB board is complete) after the test mode is activated, the non-relief
type characters can turn on. This is normal.
4. TESTING THE CLICK SHUTTLE FUNCTION
This test checks that the IF controller can recognize the rotation of the click shuttle control. When the illuminating segment moves as the
click shuttle is rotated during the subsequent grid check and the anode check, the click shuttle is normal.
click shuttle is rotated during the subsequent grid check and the anode check, the click shuttle is normal.
5. TESTING THE FL DISPLAY TUBE ILLUMINATION CHECK
The FL display tube can be simply checked by the automatic display mode, but can be checked more precisely by this mode.
All segments of the FL display tube are turned on when the [STOP] and [PLAY] buttons of the DVP-CX850D are pressed at the same time.
All segments of the FL display tube are turned on when the [STOP] and [PLAY] buttons of the DVP-CX850D are pressed at the same time.
DETAILED DESCRIPTION OF THE FRONT BOARD TEST
1
2
3
4
5
6
7
8
Input
Voltage [V]
0
0.65
1.24
1.88
2.41
2.92
3.45
3.94
Pin 6 ANO
STOP
PAUSE
T
r
ENTER
R
t
JOG
Pin 5 AN1
POWER
PLAY
MEGA-CTRL
DISC/ACS
ACS ENTER
EASY PLAY
Pin 4 AN2
TITLE
DVD MENU
RETURN
DISPLAY
CLEAR
1/ALL DISCS
TIME/TEXT
LOAD
Pin 3 AN3
REPEAT
PROGRAM
SHUFFLE
SORT
FILE
EDIT
Pin 2 AN4
FOLDER A
FOLDER B
FOLDER C
FOLDER D
FOLDER ALL
FOLDER DVD
FOLDER CD
IC201 IF CON
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