Sharp XL 1700 Service Manual - Page 40

Check as stated in item SLED MOTOR OPERATION FAILURE.

Get Sharp XL 1700 - Executive Microsystem PDF manuals and user guides
UPC - 074000412644
View all Sharp XL 1700 manuals
Add to My Manuals
Save this manual to your list of manuals

Page 40 highlights

XL-1700/1700C • Track search failure Does the sled motor run in FF/REW state when the SERVO TEST MODE "STEP1" is set? Yes Is the following wave output to the pin 34 (TRO) of IC801 during track search in normal playback? Yes TRO Check as stated in item "SLED MOTOR OPERATION FAILURE". No IC801 failure. No Is the following wave output to the pins 11 (TEO) of IC802 during track search in normal playback? Yes TEO TEI TEZI Check the PWB pattern between pin 34 (TRO) of IC801 and pin No 25 of IC803. Check the PWB pattern between pins 26 and 27 of IC803 and Optical pickup. If OK. Optical pickup failure. Is the above wave output to the pins 31 (TEI) and 32 (TEZI) of IC801 during track serch in normal playback? No Yes Check the PWB pattern between pin 11 (TEO) of IC802 and pins 31 and 32 of IC801. If OK. IC802 failure. Is the following wave output to the pin 27 (RFZI) and 28 (RFRP) of IC801 during track search in normal playback? Yes RFRP Check the PWB pattern between pins 22 (RFO),17 (RFRP), 19 No (RFGO) and 20 (RFGC) of IC802 and pins 24,27,28 and 36 of IC801. If OK. IC802 failure. RFZI Normal. • Sled motor operation failure. Is following sled feed signal output the pin 40 (FMO) of IC801 when FF /REW key is pressed after the CD TEST No MODE "STEP 1" is set? Yes FF REW FMO C801 is faulty. Is following sled feed signal output the pins 3 and 4 of IC803 when FF /REW key is pressed after the CD TEST MODE "STEP 1" is set? Yes FF REW SL ± Check the PWB pattern between pin 40 of IC801 and pins 3 and 4 No of IC803. Is sled feed signal output the pins 1 and 2 of IC803? Yes Is sled feed voltage applied between both terminals of sled motor? 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. Check the peripheral parts of IC803. If OK, IC803 is faulty. No Check the CNW802. No • Sled servo failure. Is following sled signal output the pin 40 (FMO) of IC801 during playback? Yes FMO IC801 is faulty. No Normal. - 40 -

  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9
  • 10
  • 11
  • 12
  • 13
  • 14
  • 15
  • 16
  • 17
  • 18
  • 19
  • 20
  • 21
  • 22
  • 23
  • 24
  • 25
  • 26
  • 27
  • 28
  • 29
  • 30
  • 31
  • 32
  • 33
  • 34
  • 35
  • 36
  • 37
  • 38
  • 39
  • 40
  • 41
  • 42
  • 43
  • 44
  • 45
  • 46
  • 47
  • 48
  • 49
  • 50
  • 51
  • 52
  • 53
  • 54
  • 55
  • 56
XL-1700/1700C
– 40 –
• Sled motor operation failure.
Yes
Yes
Is following sled feed signal output the pin 40 (FMO) of IC801
when FF
/REW
key is pressed after the CD TEST
MODE "STEP 1" is set?
Is sled feed signal output the pins 1 and 2 of IC803?
Is sled feed voltage applied between both terminals of sled
motor?
No
Check the peripheral parts of IC803. If OK, IC803 is faulty.
No
C801 is faulty.
Check the CNW802.
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.
• Sled servo failure.
Yes
Is following sled signal output the pin 40 (FMO) of IC801
during 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?
Is the following wave output to the pin 34 (TRO) of IC801
during track search in normal playback?
Is the following wave output to the pins 11 (TEO) of IC802
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 34 (TRO) of IC801 and pin
25 of IC803.
Check the PWB pattern between pins 26 and 27 of IC803 and
Optical pickup.
If OK.
Optical pickup failure.
Yes
Is the above wave output to the pins 31 (TEI) and 32 (TEZI) of
IC801 during track serch in normal playback?
No
Check the PWB pattern between pin 11 (TEO) of IC802 and pins 31
and 32 of IC801.
If OK. IC802 failure.
Normal.
Yes
Yes
Is following sled feed signal output the pins 3 and 4 of IC803
when FF
/REW
key is pressed after the CD TEST
MODE "STEP 1" is set?
Check the PWB pattern between pin 40 of IC801 and pins 3 and 4
of IC803.
No
Is the following wave output to the pin 27 (RFZI) and 28
(RFRP) of IC801 during track search in normal playback?
No
Check the PWB pattern between pins 22 (RFO),17 (RFRP), 19
(RFGO) and 20 (RFGC) of IC802 and pins 24,27,28 and 36 of IC801.
If OK. IC802 failure.
Yes
TRO
TEO
TEI
TEZI
FF
REW
FMO
FMO
RFZI
RFRP
FF
REW
SL
±