Technics SL-HD301 Service Manual page 12

6.3. Table 1
Symptom
FL display
When CD tray opens, it closes by itself.
Disc tray "Open" detection sensor fault.
Does not play, even when CD play button is pressed. Pickup rest position detection switch fault.
Disc tray "Closed" detection sensor fault.
Does not move even when p> (PLAY) is pressed. System control or servo processor IC fault.
| H-16 When CD tray closes, it opens by itself.
6.4. Table 2
FL error Signal to check Normal voltage and waveform values
code Symptom Probable cause - : display PLAY STOP
1C702 8 pin MDATA ov
1C702 7 pin
MCLK
ia
Focus and tracking 1. Clocks X1, power supply Vop and :
E-01 offset adjustments reset/RST, all on IC702. IC702 9 ee
: not completed in the IC702 18 pin /RST 3.4V
specified time period. | 2. MDATA, MCLK, and MLD
signal to/from |C403. C702 58 pin X1 IN AM 2.4VPP | 24vp-p
F=39.8688MHZ F=33,8688MHZ
1C702 59 pin X2 OUT 2.4VPP | 24Vpp
F=33,8688MHzZ F=33.8688MHZ
PLAY
1C702 32pin FE best o2vpp 1.7V
2ms. 0.1
PLAY.
1. Scratches or contaminants on disc | 1C702 33 pin TE poh | eevee 1.7V
E-02
surface.
2ms. 0.1V/DIV
E-04 2. Focus and tracking servo circuits. 1C702 28 pin FOD 1.7V 1.7V
E-06 | Disc play unstable. (check waveforms, voltages, and
E-OA part values.) tee =ER0 TEN La
E-0C 3. Spindle driver circuit. 1C702 38pin _| /RFDET
E-OE 4. Optical pickup. PLA
vi a | 0.8Vp-p 1 0 Vv
oSus 0.2V/DV
1C702 17 pin 3.3V ov
1. Scratches or contaminants on 1C702 32 pin FE yereyrs { iin 1.7V
Focus or Tracking disc surface. ams. 0.1V/DIV
E-og | gain adjustment not 2. Focus and Tracking servo circuit. nae
E-0A | conpleted in the (check waveforms, voltages, and 1C702 33 pin TE | 0.6Vp-p 17
specified time period. part values.) ams. 0.2V/DIV '
3. Optical pickup. [ Icvo236pin | OFT | ov ov
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