Read Sharp XL-70 (serv.man5) Service Manual online
– 41 –
XL-60H/70H
• HF error.
Yes
Yes
Is output (tracking error signal) obtained at the pins 46 (TEI)
and 47 (TEZI) of IC802 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
and 47 (TEZI) of IC802 the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
Is output (HF signal) obtained at the pin 38 (RFI) of IC802
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 pins 41 (RFZI) and 42
(RFRP) of IC802 when the CD TEST MODE "STEP 4" is
changed to "STEP 5"?
(RFRP) of IC802 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
Is +4.5V applied to pin 83 (DVDD) of IC802?
No
Check the PWB pattern between pin 50 (TEO) of IC802 and pin 18
of IC804.
Check the periphery of IC804 and BI801/CNS801.
If OK. Optical pickup failure.
of IC804.
Check the periphery of IC804 and BI801/CNS801.
If OK. Optical pickup failure.
Check the periphery of IC801.
Check the PWB pattern between pin17 (RFRP) of IC801 and pins
41 (RFZI) and 42 (RFRP) of IC802.
If OK. IC801 is faulty.
Check the PWB pattern between pin17 (RFRP) of IC801 and pins
41 (RFZI) and 42 (RFRP) of IC802.
If OK. IC801 is faulty.
No
Yes
Normal.
Check the interval between the pins 82 or 85 of IC802 and the pins
1 or 3 IC601.
1 or 3 IC601.
No
Check the PWB pattern between R819 and Q861.
Yes
Is signal of pins 82 and 85 of IC802 output?
No
Check the peripheral parts of IC802. If OK, IC802 is faulty.
Yes
The main PWB is faulty.
Check the periphery of IC801.
Check the PWB pattern between
pin 12.
(TEO) of IC801 and pins 46 and 47
of IC802.
Is it normal ?
Check the PWB pattern between
pin 12.
(TEO) of IC801 and pins 46 and 47
of IC802.
Is it normal ?
Is output obtained at the pins 2 and
5 of BI802/CNS802
5 of BI802/CNS802
Optical pickup failure.
IC801 is faulty.
Check the periphery of IC801.
Check the PWB pattern between pin 19 (RFGO) of IC801 and pins
38 (RFI) of IC802.
If OK. IC801 is faulty
Check the PWB pattern between pin 19 (RFGO) of IC801 and pins
38 (RFI) of IC802.
If OK. IC801 is faulty
Is output obtained at the pins 1 and
3, 4 of BI802/CNS802.
3, 4 of BI802/CNS802.
Optical pickup failure.
Is the following wave output to the pin 55 (DMO) of IC802
when the CD TEST MODE "STEP 4" or "STEP 5"?
when the CD TEST MODE "STEP 4" or "STEP 5"?
Check the periphery pins 28~32 of IC802.
If OK. IC802 failure.
If OK. IC802 failure.
No
No
No
Yes
Yes
No
Yes
Yes
test mode "step 4"
test mode "step 5"
TEI
TEZI
test mode "step 4"
test mode "step 5"
RFI
test mode "step 4"
test mode "step 5"
RFZI
RFRP
test mode "step 4"
test mode "step 5"
DMO
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