Sharp XL-70 Service Manual page 35

Make sure that the disc is normal, and set the CD TEST MODE (STEP 1).
Is the measured voltage as specified in circuit diagram?
Is "Er-CD01" displayed"?
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?
Is +5V applied to pin 100 (/RST) of IC802?
Does the CD TEST MODE advance from "STEP 2"?
Does the laser come on in CD TEST MODE "STEP 2"?
Does the CD TEST MODE advance from "STEP 3" to "STEP
4"?
Does the spindle motor rotate normally when the CD TEST
MODE changes from "STEP 4" to "STEP 3"?
Is the HF output on pin 38 of IC802 in CD TEST MODE "STEP 5"?
Does the sound heard when the optical pickup move to the
selected play by the FF/REW key.
Does the LCD track number and time indicator work properly ?
Turn the power off and then back on.
Does the unit initialize properly and start playback when PLAY
key is pressed?
Does the unit play in order in the FF mode?
Does playback continue for 30 seconds after the start of
playback ?
Normal
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Check the main unit power supply circuit.
No
No
Check the pattern between pin 57 (PUIN) of IC701 and BI803/
No
CNS803.
Check the between BI803/CNS803 and PU-IN switch.
Check the PWB pattern between pin 45 (CD RES) of IC701 and
No
pin 100 (/RST) of IC802.
Is CD Lid switch SW701
No
ON condition ?
Yes
Check the between pattern IC701 and SW701 If OK.
Check the main unit power supply circuit.
Check the procedure in "LASER FAILURE".
No
Check the procedure in "FOCUS FAILURE".
No
Check the procedure in "SPINDLE MOTOR CLV SERVO
No
FAILURE".
Check the procedure "HF ERROR".
No
Does the sled motor
No
move ?
Yes
Check the procedure "NO SOUND"
Check the pattern between IC701 and LCD701.
No
Is "Er-CD01 "
No
displayed ?
Yes
Check the pattern between pin 57 (PUIN) of IC701 and
BI803/CNS803.
Check the between BI803/CNS803 and PU-IN switch.
Check the procedure in "HF ERROR".
Check the procedure in "TRACK SEARCH FAILURE".
No
Check the procedure in "SLED SERVO FAILURE".
No
– 35 –
XL-70/70C
Set ON condition the CD
No
Lid switch.
Check the procedure in
No
"SLED MOTOR
OPERATING FAILURE ".
Is "Er-CD01" displayed?
No
Yes