Service manual

XL-520W/CP-520
– 34 –
• HF error.
Yes
Yes
Is output (tracking error signal) obtained at the pin 35 (TSO) of
IC801 when the CD test mode "STEP4" is set?
Is tracking output obtained at the pin 30 (TS20) of IC801 when
the CD test mode "STEP5" is set?
Is output obtained between the pins 6 and 7 of IC804?
No
Check the peripheral parts of IC801. If OK, IC801 is faulty.
No
• No sound.
No sound from both L and R-ch?
Yes
Is power supply voltage of IC802 normal?
No
• Track search failure
Does the sled motor run in FF/REW state when the servo
test mode "STEP1" is set?
Is the following waveform output at the pin 35 (TSO) of IC801
during track search in normal playback?
Is the following waveform output at the pin 5 (RFRP) of IC801
during track jump?
Yes
Yes
No
Check IC801 and the periphery of CNW802. If OK, the optical
pickup is faulty.
VRO
Check the peripheral parts of IC804. If OK, IC804 is faulty,
No
Yes
Check the connection between IC804 and CNW801.
If OK, the optical pickup is faulty.
Check the interval between the pins 11 and 12 CNS602 as well as
between the pins 2 and 6 of IC602.
No
Check power supply line.
Yes
Is signal of pins 2 and 6 of IC802 output?
No
Check the peripheral parts of IC802. If OK, IC802 is faulty.
Yes
The main PWB is faulty.
Check as stated in item "SLED MOTOR OPERATION FAILURE".
No
Check the pattern between pins 34, 35 of IC801 and pins 48,49 of
IC802.
TSO
No
Check the C828. If OK, IC801 is faulty.
* The state where the waveform shown left is output at the pin 33 (TKIC) of
IC802 is referred to as track jump state.
or
Kick Pulse
Pin5
(RFRP)
Pin35
(TSO)
Yes
Is the following waveform output at the pin 30 (TS20) and pin
35 (TSO) of IC801 during track jump?
No
Check pattern between pin 33 of IC802 and pin 31 of IC801.
If OK, IC801 is faulty.
Check the pariphery of pin 30 (TS20) and pin 26 (FUSO) of
IC801.
Yes
Pin35
(TSO)
Pin30
(TS20)