Read Sharp XL-55 (serv.man18) Service Manual online
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XL-55H65H
Make sure that the disc is normal, and set the CD TEST MODE (STEP 1).
Is the measured voltage as specified in circuit diagram?
Check the main unit power supply circuit.
No
Yes
No
Is "Er-CD01" displayed"?
Yes
Move the pickup to most internal circumference side of disc.
Turn the power off and reset the CD TEST MODE (STEP 1).
Is "PU ERROR " not displayed?
Turn the power off and reset the CD TEST MODE (STEP 1).
Is "PU ERROR " not displayed?
Yes
Check the PWB pattern between pin 59 (MRST) of IC701 and pin
18 (/RST) of IC801.
18 (/RST) of IC801.
No
Is +5V applied to pin 18 (/RST) of IC801?
Yes
Is CD Lid switch SW801
ON condition ?
ON condition ?
No
Does the CD TEST MODE advance from "STEP 2"?
Yes
Check the between pattern IC701 and SW801 If OK.
Check the main unit power supply circuit.
Check the main unit power supply circuit.
No
Does the laser come on in CD TEST MODE "STEP 2"?
Check the procedure in "LASER FAILURE".
Yes
Does the CD TEST MODE advance from "STEP 3" to "STEP
4"?
4"?
Check the procedure in "FOCUS FAILURE".
Yes
Yes
Does the spindle motor rotate normally when the CD TEST
MODE changes from "STEP 4" to "STEP 3"?
MODE changes from "STEP 4" to "STEP 3"?
Yes
Is the HF output on pin 34 of IC801 in CD TEST MODE "STEP 5"?
Check the procedure "HF ERROR".
Yes
No
No
No
No
Check the pattern between pin 58 (PUIN) of IC701 and
CNW803/CNS803.
Check the between CNW803/CNS803 and PU-IN switch.
CNW803/CNS803.
Check the between CNW803/CNS803 and PU-IN switch.
Set ON condition the CD
Lid switch.
Lid switch.
Check the procedure in "SPINDLE MOTOR CLV SERVO
FAILURE".
FAILURE".
No
Does the sled motor
move ?
move ?
No
Does the sound heard when the optical pickup move to the
selected play by the FF/REW key.
selected play by the FF/REW key.
Check the procedure "NO SOUND"
No
Yes
Check the procedure in
"SLED MOTOR
OPERATING FAILURE ".
"SLED MOTOR
OPERATING FAILURE ".
Does the LCD track number and time indicator work properly ?
Check the pattern between IC701 and LCD701.
Yes
No
No
Turn the power off and then back on.
Does the unit initialize properly and start playback when PLAY
key is pressed?
Does the unit initialize properly and start playback when PLAY
key is pressed?
Check the pattern between pin 58 (PUIN) of IC701 and
CNW803/CNS803. Check the between CNW803/
CNS803 and PICKUP-IN switch.
CNW803/CNS803. Check the between CNW803/
CNS803 and PICKUP-IN switch.
No
Is "Er-CD01" displayed?
Check the procedure in "HF ERROR".
Yes
Yes
Does the unit play in order in the FF mode?
Check the procedure in "TRACK SEARCH FAILURE".
Yes
Does playback continue for 30 seconds after the start of
playback ?
playback ?
Check the procedure in "SLED SERVO FAILURE".
Yes
Normal
No
No
Yes
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