Sharp XL-30V Service Manual page 43

Set an audio disc and turn on the power, set to the CD function. Is +8.0V on the 2 pin and +5.0V on the 4 pin of BI605B/CNS605B?
Is +5.0V on CNP810?
Is the measured voltage the same as the one specified in the circuit
diagram?
(Turn on the power again if "Er-CD30" is displayed on the LCD
during the measurement.)
Is +5.0V on the 40 pin of IC806?
Is the sending waveform (8MHz) also on the 16 pin?
Is the SHARP logo displayed on the TV screen?
Is "Er-CD30" displayed on the LCD?
Is "Er-CD01" displayed on the LCD?
Cut off the power and return the pickup to the innermost periphery
of disc by hand and turn on the power again.
Isn't "Er-CD01" displayed?
Is the disc rotating after turning on the power?
Is the pickup moving up and down?
Does laser light on when the pickup is moving up and down?
Check the items of "Focus abnormal".
Is "NO DISC" displayed on the LCD?
Is "READ ERROR" displayed on the LCD?
Does the disc stop after a while and are track and time displayed
on the LCD?
Is sound heard when playback is started by pressing the PLAY
key?
Is the next track played by pressing the FF key?
Does playback last 30 seconds after start?
Can video CD be played back?
Normal
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Check the power supply circuit of the main unit.
No
Check around IC806/IC807.
No
If OK, IC807 or IC806 are defective.
Check the items of "SHARP logo is not displayed".
No
Check the items of "Communication error".
No
Check pattern between the 9 pin of IC806 (PUN SW) and
No
BI803/CNS803. Check between BI803/CNS803 and PU-IN
switch.
Check the items of "Pickup does not move up and down".
No
Check the items of "Laser abnormal".
No
Check the items of "NO DISC display".
Yes
Check the items of "HF abnormal".
Yes
Check the items of "HF abnormal".
No
Check the items of "No sound".
No
Check the items of "Track search abnormal".
No
Check the items of "Feed motor abnormal".
No
Check the items of "Video CD not played back".
No
– 43 –
XL-30V