DX-V788W
Y Press the ON/STAND-BY button.
Is LED displayed ?"LED is not displayed."
No
Yes
Is the SHARP logo screen displayed ?"The SHARP logo is not displayed."
No
Yes
Is "ERROR" displayed ?"ERROR is displayed."
Yes
No
Can the tray be open or closed ?The tray mechanism is defective.
No
Yes
Is No Disc displayed ?"No Disc is displayed."
Yes
No
Can a Video CD be played ?"The Video CD cannot be played normally."
No
Yes
Can the Audio signal be heard ?"No sound is heard."
No
Yes
Is an audio signal being output from the microphone ?The microphone signal is not being output.
No
Yes
End
Y LED is not displayed.
Is pin 13 (RESET) on IC14 "H" ?Check R142, C106 and the reset signal line.
No
Yes
Is a 27 MHz clock signal available at pin 71 on IC14 (ES3883F) ?XL100 or peripheral parts are defective. The soldering on IC14
No
Is a 13.5 MHz clock signal available at pin 79 ? Is a 27 MHz clock(ES3883F) is poor, or the IC itself is defective.
signal available at pin 80 ?
Yes
Is a voltage of 3.5 V ? 0.2 V available at the Q11 (2SD1858 R2) Q11 or peripheral parts are defective.
emitter ?No
Yes
Is the signal shown in waveform drawings 7, 8 and 9 present atThe soldering on IC10, IC14, IC15 or IC16 is poor, or one or
No
pins 2, 3 and 4 on CNP804 ?more of the ICs defective.
Yes
When a button on the main unit or on the remote control is pressed,Pin 1 on CNP804 is broken or IC16 is defective.
does the signal on pin 1 (IRQ) on CNP804 change ?No
Yes
Is a clock signal being supplied to pin 96 (TDMCLK) on IC15
Check the traces and pin 7 on IC2 (TC9462F).
(ES3880F) ? (Refer to the waveform number 1 shown in page 27.)No
Yes
The soldering on IC15 (ES3880F) is poor or the IC is defective.
Solder the ES3880F or change it.
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ACEC
