Read Sony DVP-CX850D Service Manual online
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5-2.
Grid Check (Pressing the
R
button enters the grid check mode)
Any desired grid of the FL display tube can be turned on one after another by this mode. (All anodes of the corresponding grid are turned on.)
Move the click shuttle control of the DVP-CX850D to select the desired grid to test.
When the click shuttle is rotated in the clockwise direction starting from G16, the grid G15, G14, —— G1 are turned on. After G1, the grid
G16 turns on. Any one of the grids turns on during this test.
Move the click shuttle control of the DVP-CX850D to select the desired grid to test.
When the click shuttle is rotated in the clockwise direction starting from G16, the grid G15, G14, —— G1 are turned on. After G1, the grid
G16 turns on. Any one of the grids turns on during this test.
5-3.
Anode Check (Pressing the
t
button enters the anode check mode)
Any desired anode of the FL display tube can be turned on one after another by this mode. (All grids of the corresponding anode are turned
on.)
When the click shuttle is rotated in the clockwise direction starting from P1, the anode moves to P2, P3, —— and returns to P1 after the last
anode. Any one of the anodes turns on during this test.
on.)
When the click shuttle is rotated in the clockwise direction starting from P1, the anode moves to P2, P3, —— and returns to P1 after the last
anode. Any one of the anodes turns on during this test.
6. TESTING THE LED CONTROL FUNCTION
The LEDs can be turned on one after another when the button
r is pressed.
When the click shuttle is rotated, the LED to turn on moves.
The self-illuminating buttons can be turned on and off, not using this mode, but by operating the buttons.
The self-illuminating buttons can be turned on and off, not using this mode, but by operating the buttons.
7. TESTING THE KEY BOARD CONTROL FUNCTION
When [ENTER] of the direction pointing button inside the click shuttle is pressed, the message [Key Board TST] appears in the state waiting
for keyboard input.
The numerical and alphabetical character inputs are accepted. The typed characters appear on the display.
When pressing the [Caps Lock] button or [Num Lock] button turns on the LED, the keyboard circuit is judged to be functioning correctly.
The keyboard of the IBM compatible PC of the USA model can be connected.
for keyboard input.
The numerical and alphabetical character inputs are accepted. The typed characters appear on the display.
When pressing the [Caps Lock] button or [Num Lock] button turns on the LED, the keyboard circuit is judged to be functioning correctly.
The keyboard of the IBM compatible PC of the USA model can be connected.
8. TROUBLESHOOTING
8-1.
Cannot Enter the Test Mode
When any button is pressed by some reason after the front panel is already attached, the machine cannot enter the test mode.
The main power cannot also be turned in this state. (The machine stays in the standby state. = The red LED is kept turned on.)
The remote commander cannot also control the machine, not only the button operation is invalid.
To diagnose this state, turn on the main AC power while the self-check port (pin-69 of the IF commander) is kept "Low". The machine enters
forcibly the test mode. Alternately, short the soldering lands that have the indication SELF on the printed board. The IF controller checks the
self-check port only after the power-on reset. (It does not check the port in the standby mode.)
Pressing any button displays the button name on the FL display tube.
If any display other than NOTHING appears even though any button is not pressed, the machine mis-operates as if any button is pressed. In
this state, be sure to remove the FFC from pin-15 that is connected to the MB board, otherwise the machine enters the standby state immediately.
The main power cannot also be turned in this state. (The machine stays in the standby state. = The red LED is kept turned on.)
The remote commander cannot also control the machine, not only the button operation is invalid.
To diagnose this state, turn on the main AC power while the self-check port (pin-69 of the IF commander) is kept "Low". The machine enters
forcibly the test mode. Alternately, short the soldering lands that have the indication SELF on the printed board. The IF controller checks the
self-check port only after the power-on reset. (It does not check the port in the standby mode.)
Pressing any button displays the button name on the FL display tube.
If any display other than NOTHING appears even though any button is not pressed, the machine mis-operates as if any button is pressed. In
this state, be sure to remove the FFC from pin-15 that is connected to the MB board, otherwise the machine enters the standby state immediately.
8-2.
The Main Power Cannot Be Turned On
1. The red (STANDBY) LED does not turn on even though the main AC power is turned on.
The power (EVER 5V) is not supplied.
X201 does not oscillate.
Connectors connecting the FL board with the FR board have the defective connection.
X201 does not oscillate.
Connectors connecting the FL board with the FR board have the defective connection.
2. The red (STANDBY) LED remains ON even though the POWER button is pressed.
Any button is in the state of being kept pressed.
PCHECK (pin-77 of the IF controller) is 0.1 V or more.
PCHECK (pin-77 of the IF controller) is 0.1 V or more.
3. The LED turn on in green when the POWER button is pressed, but returns to red several seconds later.
PCHECK (pin-77 of the IF controller) voltage is not normal.
(Rising up from 0. 1 V to 1.5 V or higher is slow. Or the voltage does not go higher than 1.5 V.)
The system controller does not operate correctly.
(Rising up from 0. 1 V to 1.5 V or higher is slow. Or the voltage does not go higher than 1.5 V.)
The system controller does not operate correctly.
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