XL-55 (serv.man18). Troubleshooting - Sharp Audio Service Manual (repair manual). Page 5

Read Sharp XL-55 (serv.man18) Service Manual online

XL-55H/65H
– 42 –
• 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"?
Is output (HF signal) obtained at the pin 44 (ARF) of IC801
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"?
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.
Check the periphery of IC801.
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.
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 ?
Is output obtained at the pins 2 and
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
Is output obtained at the pins 1 and
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"?
Check the periphery pins 52~53 of IC801.
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

Display

Click on the first or last page to see other XL-55 (serv.man18) service manuals if exist.

Random: