Sharp XL-35 (serv.man21) Service Manual ▷ View online
– 33 –
XL-35H
• Focus failure.
Does the optical pickup move up and down when the disc is
removed?
removed?
Is the following waveform output at the pin 32 (FE) of IC801
when the disc is set? (See Fig.15-1)
when the disc is set? (See Fig.15-1)
Yes
Yes
No
No
The optical pickup is faulty.
Check as stated in item "FOCUS SERVO SAWTOOTH WAVE
FAILURE".
FAILURE".
Yes
Check the periphery of IC802 and CNW802/CNS802. Is it normal?
IC802 is faulty.
• Laser failure.
Yes
No
Does the laser come on when pattern cut between pin 24 of IC802
and pin 40 of IC801 ?
and pin 40 of IC801 ?
Check the PWB pattern between IC701 and IC801 (MCLK/MLD/
MDATA/BL)
MDATA/BL)
Yes
Yes
No
Check the peripheral parts of IC802 and Q801. If it is normal, the
optical pickup is faulty.
optical pickup is faulty.
No
Check CNW802/CNS802. If it is normal, the optical pickup is
faulty.
faulty.
Is approx. 2V applied to the collector of Q801.
Is +6.2V applied to the emitter of Q804 ?
Is +5V applied to the collector of Q804 ?
Yes
No
No
Check the PWB pattern between pin 5 of CNS605 and emitter of
Q804.
Q804.
Check the peripheral parts of IC804 and Q804.
Is +5V applied to the pin 4 (DVDD1) of IC802 ?
Is +5V applied to the pin 3 (VCC) of IC802 ?
Yes
No
No
Check the PWB pattern between collector of Q804 and pin 4 of
IC802.
IC802.
Check the PWB pattern between collector of Q804 and pin 3 of
IC802.
IC802.
Yes
Yes
Is 0V applied to the pin 40 of IC801 ?
XL-35H
– 34 –
• Focus servo sawtooth wave failure.
Is +6.2V applied to the pins 21 and 22 (VCC) of IC804 ?
Is sawtooh wave output to the pin 28 (FOO) of IC801 ?
IC801 is faulty.
No
Yes
Yes
Is sawtooth wave obtained between pins 26 and 27 of IC804 ?
No
No
Check the PWB pattern
between pin 7 of IC804
and pin 60 (CD STB) of
IC701.
between pin 7 of IC804
and pin 60 (CD STB) of
IC701.
Is +5V applied to the pin 7
(MUTE) of IC804 ?
(MUTE) of IC804 ?
Check the PWB pattern between pin 28 (FOO) of IC801 and pins
24 and 25 of IC804. If OK. IC804 is faulty.
24 and 25 of IC804. If OK. IC804 is faulty.
Check the PWB pattern between pin 5 of CNS605 and IC804.
No
Is sawtooth wave obtained between pins 3 and 4 of CNW801/
CNS801 ? (as shown above)
CNS801 ? (as shown above)
Yes
Check the PWB pattern between CNW801/CNS801 and IC804.
No
CNW801/CNS801 connection failure or optical pickup failure.
Yes
• Spindle motor clv servo failure.
Is above wave obtained between pins 9 and 10 of IC804 ?
Is following wave output to the pin 11,12 of IC804 when the CD
TEST MODE "STEP 3" is changed to " STEP 4" ?
TEST MODE "STEP 3" is changed to " STEP 4" ?
No
Yes
Check the procedure in "HF ERROR".
If OK. IC801 is faulty.
If OK. IC801 is faulty.
Check the PWB pattern between pin 24,25 of IC801 and pins 9
and 10 of IC804. If OK. IC804 is faulty.
and 10 of IC804. If OK. IC804 is faulty.
No
Is above wave obtained between pins 5 and 6 of CNW801/
CNS801 ?
CNS801 ?
Yes
Check the PWB pattern between CNW801/CNS801 and IC804.
No
CNW801/CNS801 connection failure or optical pickup failure.
Yes
VO2
Yes
1.5~2.5sec
1.5~2.5sec
– 35 –
XL-35H
• HF error.
Yes
Yes
Is output (tracking error signal) obtained at the pins 33 (TE)
and 37 (TRCRS) of IC801 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
and 37 (TRCRS) of IC801 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Is output (HF signal) obtained at the pin 44 (ARF) of IC801
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
Is output (HF signal) obtained at the pin 38 (/RFDET) of IC801
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
when the CD TEST MODE "STEP 4" is changed to "STEP 5"?
No
No
• No sound.
No sound from both L and R-ch?
Yes
Check the PWB pattern between pin 33 (TE) of IC801 and pin 19
of IC804.
Check the periphery of IC804 and CNW801/CNS801.
If OK. Optical pickup failure.
of IC804.
Check the periphery of IC804 and CNW801/CNS801.
If OK. Optical pickup failure.
Check the periphery of IC801.
Check the PWB pattern pin38 (/RFDET) of IC801.
If OK. IC802 is faulty.
Check the PWB pattern pin38 (/RFDET) of IC801.
If OK. IC802 is faulty.
No
Yes
Normal.
Check the interval between the pins 73 or 75 of IC801 and the pins
1 or 3 IC601.
1 or 3 IC601.
No
Yes
Is signal of pins 73 and 75 of IC801 output?
No
Check the peripheral parts of IC801. If OK, IC801 is faulty.
The main PWB is faulty.
Check the periphery of IC802.
Check the PWB pattern between
pin 20.
(TEOUT) of IC802 and pins 33 and
37 of IC801.
Is it normal ?
Check the PWB pattern between
pin 20.
(TEOUT) of IC802 and pins 33 and
37 of IC801.
Is it normal ?
Is output obtained at the pins 2 and
5 of CNS802
5 of CNS802
Optical pickup failure.
IC801 is faulty.
Check the periphery of IC801.
Check the PWB pattern pin 44 (ARF) of IC801.
If OK. IC802 is faulty
Check the PWB pattern pin 44 (ARF) of IC801.
If OK. IC802 is faulty
Is output obtained at the pins 1 and
3, 4 of CNS802.
3, 4 of CNS802.
Optical pickup failure.
Is the following wave output to the pin 10 (VIN2) of IC804
when the CD TEST MODE "STEP 4" or "STEP 5"?
when the CD TEST MODE "STEP 4" or "STEP 5"?
Check the periphery pins 52~53 of IC801.
If OK. IC801 failure.
If OK. IC801 failure.
No
No
No
Yes
Yes
No
Yes
Yes
test mode "step 4"
test mode "step 5"
TE
TRCRS
test mode "step 4"
test mode "step 5"
ARF
test mode "step 4"
test mode "step 5"
/RFDET
test mode "step 4"
test mode "step 5"
VO2
XL-35H
– 36 –
• Sled motor operation failure.
Yes
Is following sled feed signal input the pin 3 (VIN1) of IC804
when FF/REW key is pressed after the CD TEST MODE
"STEP 1" is seted?
when FF/REW key is pressed after the CD TEST MODE
"STEP 1" is seted?
Is sled feed voltage applied between both terminals of sled
motor?
motor?
No
C801 is faulty.
Check the CNW803/CNS803.
No
Yes
Check the CD mechanism (periphery of sled motor).
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
If the sled motor does not run when DC2.0V is applied to
both terminals of sled motor, the sled motor is faulty.
• Sled servo failure.
Yes
Is following sled signal output the pin 3 (VIN1) of IC804 during
playback?
playback?
Normal.
No
IC801 is faulty.
• Track search failure
Does the sled motor run in FF/REW state when the SERVO
TEST MODE "STEP1" is set?
TEST MODE "STEP1" is set?
Is the following wave output to the pin 27 (TRO) of IC801
during track search in normal playback?
during track search in normal playback?
Is the following wave output to the pins 20(TEOUT) of IC802
during track search in normal playback?
during track search in normal playback?
Yes
Yes
No
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
IC801 failure.
No
Check the PWB pattern between pin 27 (TRO) of IC801 and pin
19 of IC804.
Check the PWB pattern between pins 17 and 18 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
19 of IC804.
Check the PWB pattern between pins 17 and 18 of IC804 and
Optical pickup.
If OK. Optical pickup failure.
Yes
Is the above wave output to the pins 33 (TE) of IC801 during
track search in normal playback?
track search in normal playback?
No
Check the PWB pattern between pin 20 (TEOUT) of IC802 and pin
33 of IC801. If OK. IC802 failure.
33 of IC801. If OK. IC802 failure.
Normal.
Yes
Yes
Is following sled feed signal output the pins 1 and 2 of IC804
when FF/REW key is pressed after the CD TEST MODE
"STEP 1" is seted?
when FF/REW key is pressed after the CD TEST MODE
"STEP 1" is seted?
IC804 is faulty.
No
Is the following wave output to the pin 38 (/RFDET) of IC801
during track search in normal playback?
during track search in normal playback?
No
Check the PWB pattern pin 8 (ARF) and 38 (/RFDET) of IC801 and
pin15 (NRFDET) of IC802 . If OK. IC802 failure.
pin15 (NRFDET) of IC802 . If OK. IC802 failure.
Yes
TRO
TEOUT
TE
FF
REW
VIN1
VIN1
/RFDET
FF
REW
SL
±
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