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5
5. DIAGNOSIS
5.1 TROUBLESHOOTING
No Power
Is the voltage of MCU+5V
(POWER PCB Assy CON402-1 pin)
5 V?
Yes
Is the VDD3.3V (MAIN PCB Assy
IC8-3 pin), VDD1.8V (MAIN PCB Assy
U4-5 pin) output?
Yes
After having pressed STANDBY/ON
button, is the voltage of RELAY_CTL
(POWER PCB Assy CON402-3 pin) 3.3V
and is RELAY (RL401) on?
Yes
Does the voltages output in CON401?
(POWER PCB Assy: +B: 18V, USB_VCC: 12V,
iPod_VCC: 12V, +8V)
Yes
Replace MAIN PCB Assy.
Although a CD is inserted and the Tray is closed, "NO DISC" is displayed.
Press the Tray CD Eject Button without inserting a disc, and try starting the playback operation.
1. Does the pickup move to the PICKUP-IN Switch
position?
2. Does the focus (lens) move up and down?
3. Is the laser lit?
4. Is the turntable rotating?
5. Is the Laser power, Focus, Tracking circuit OK?
5
6
Check the IC401, D401 to D404, T401, F405
No
(POWER PCB Assy). At abnormal, replace
POWER PCB Assy.
No
Check the IC8, U4 (MAIN PCB Assy).
At abnormal, replace MAIN PCB Assy.
No
Check the RELAY_CTL line.
No
Check the F401 to F404 power lines.
At abnormal, replace POWER PCB Assy.
Yes
Yes
Yes
Yes
6
7
No
Check Sled circuit. U7 (pin 17,18,19,20)
No
Check Focus peripheral circuit.
U5 (pin 65) U7 (pin 1 to 4)
No
Check the laser diode at U5 pin 80 and R128
peripheral circuit.
No
Check Spindle circuit.
U5 (pin 68), U7 (pin 9,10,11,12)
No
Check the Laser power, Focus, Tracking peripheral
circuit. U5 (pin 64, 65, 80), U7 (pin 1 to 4 24 to 27)
X-HM20-K
7
8
A
B
C
D
E
F
11
8
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