Sharp XL 1700 Service Manual - Page 36

Is the HF output on pin 24 of IC801 in CD TEST MODE STEP 5?

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Page 36 highlights

XL-1700/1700C Make sure that the disc is normal, and set the CD TEST MODE (STEP 1). Is the measured voltage as specified in circuit diagram? Yes Check the main unit power supply circuit. No Is "Er-CD01" displayed"? No 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? Yes Check the pattern between pin 58 (PU_IN) of IC701 and No CNW704/CNP704. Check the between CNW704/CNP704 and PU-IN switch. Is +5V applied to pin 63 (RST) of IC801? Yes Does the CD TEST MODE advance from "STEP 2"? Yes Does the laser come on in CD TEST MODE "STEP 2"? Yes Does the CD TEST MODE advance from "STEP 3" to "STEP 4"? Yes Does the spindle motor rotate normally when the CD TEST MODE changes from "STEP 4" to "STEP 3"? Yes Is the HF output on pin 24 of IC801 in CD TEST MODE "STEP 5"? Yes Does the sound heard when the optical pickup move to the selected play by the FF /REW key. Yes Check the PWB pattern between pin 65 (CD_RES) of IC701 and No pin 63 (RST) of IC801. Is CD Lid switch SW802 Set ON condition the CD No ON condition ? No Lid switch. Yes Check the between pattern IC701 and SW802 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 Check the procedure in No move ? No "SLED MOTOR Yes OPERATING FAILURE ". Check the procedure "NO SOUND" Does the LCD track number and time indicator work properly ? Yes Turn the power off and then back on. Does the unit initialize properly and start playback when PLAY key is pressed? Yes Check the pattern between IC701 and LCD701. No Is "Er-CD01 " No displayed ? Yes No Check the procedure in "HF ERROR". Check the pattern between pin 58 (PU_IN) of IC701 and CNW704/CNP704. Check the between CNW704/ CNP704 and PU-IN switch. Does the unit play in order in the FF mode? Yes Does playback continue for 30 seconds after the start of playback ? Yes Normal Check the procedure in "TRACK SEARCH FAILURE". No Check the procedure in "SLED SERVO FAILURE". No - 36 -

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XL-1700/1700C
– 36 –
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?
Yes
Check the PWB pattern between pin 65 (CD_RES) of IC701 and
pin 63 (RST) of IC801.
No
Is +5V applied to pin 63 (RST) of IC801?
Yes
Is CD Lid switch SW802
ON condition ?
No
Does the CD TEST MODE advance from "STEP 2"?
Yes
Check the between pattern IC701 and SW802 If OK.
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"?
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"?
Yes
Is the HF output on pin 24 of IC801 in CD TEST MODE "STEP 5"?
Check the procedure "HF ERROR".
Yes
No
No
No
No
Check the pattern between pin 58 (PU_IN) of IC701 and
CNW704/CNP704.
Check the between CNW704/CNP704 and PU-IN switch.
Set ON condition the CD
Lid switch.
Check the procedure in "SPINDLE MOTOR CLV SERVO
FAILURE".
No
Does the sled motor
move ?
No
Does the sound heard when the optical pickup move to the
selected play by the FF
/REW
key.
Check the procedure "NO SOUND"
No
Yes
Check the procedure in
"SLED MOTOR
OPERATING FAILURE ".
Does the LCD track number and time indicator work properly ?
Check the pattern between IC701 and LCD701.
Yes
No
Is "Er-CD01 "
displayed ?
No
Turn the power off and then back on.
Does the unit initialize properly and start playback when PLAY
key is pressed?
Check the pattern between pin 58 (PU_IN) of IC701
and CNW704/CNP704. Check the between CNW704/
CNP704 and PU-IN switch.
No
Yes
Check the procedure in
"HF ERROR".
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 ?
Check the procedure in "SLED SERVO FAILURE".
Yes
Normal
No
No
Yes