Sharp XL-DV50 (serv.man2) Service Manual ▷ View online
XL-DV50H
7 – 2
Although a DVD/CD is inserted and the cover is closed,
"NO DISC" is displayed.
"NO DISC" is displayed.
(1) Focus-HF system check.
Press the OPEN/CLOSE switch (SW717) without inserting a
disc, and try starting the playback operation.
disc, and try starting the playback operation.
Figure 1
Stop
1. Does the pickup move to the PICKUP-IN Switch position?
No
Sled motor.
Yes
2. Does the focus (lens) move up and down?
(Waveform drawing Figure 1)
(Waveform drawing Figure 1)
No
Check the focus peripheral circuit.
Yes
3. Is the laser lit?
No
Check the laser diode driver Q10,Q11 peripheral circuit.
Yes
4. Is the turntable rotating?
No
Spindle motor.
When a disc is loaded, start playback operation.
1. Is focus servo activated?
(Waveform drawing Figure 2)
(Waveform drawing Figure 2)
No
Pins 39~41, 79 and 63 on U7.
Check the laser diode driver Q409 peripheral circuit.
Check the laser diode driver Q409 peripheral circuit.
Yes
3. Is the HF waveform normal?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
Stop
Figure 3
Stop
XL-DV50H
7 – 3
Check the TE waveform at pin 39 on U7.
(2) Focus-HF system check.
If the waveform shown in Figure 4 appears and soon after NO
DISC appears?
DISC appears?
Yes
The tracking servo is not activated.
Check the peripheral circuits at pin 39 on U7, and Pin 145 on
U9 and JP13.
Check the peripheral circuits at pin 39 on U7, and Pin 145 on
U9 and JP13.
No
"Initialization" is possible, but play is not possible?
Yes
Check the CNP802 and J5 connect well or not.
No
"Initialization" is not possible.
Check the J5 connect well
or not
or not
Figure 4
Stop
(3) Spin system check.
Press the OPEN/CLOSE switch without inserting a disc, and
then try starting the play operation.
then try starting the play operation.
1. The turntable rotates a little?
(Waveform drawing Figure 5)
(Waveform drawing Figure 5)
Yes
The spin driver circuit is OK.
No
2. The turntable doesn't rotate.
Check around pins 17,18 on U8.
Figure 5
Stop
XL-DV50H
7 – 4
When toc can read out and play normal, but no sound, please check as the following steps:
(4) Others.
Is the waveform correct?
(Waveform drawing Figure 6)
(Waveform drawing Figure 6)
No
Check U9.
Yes
Is U1 output L/R and sub woofer normally?
No
Change U1.
Yes
Is J1 connect correctly?
No
Connect J1 well.
Yes
Check CNP904 if connect well.
Figure 6
Stop
XL-DV50H
8 – 1
Audio
XL-DV50H
Service Manual
XLDV50H
Market
E
CHAPTER 8.
OTHERS
[1] FUNCTION TABLE OF IC
IC601 VHiLC75341M-1: Signal Control (LC75341M)
IC603 VHiLC75341M-1: Signal Control (LC75341M)
IC601 VHiLC75341M-1: Signal Control (LC75341M)
IC603 VHiLC75341M-1: Signal Control (LC75341M)
Pin No.
Terminal Name
Function
1
DI
Serial data and clock input pin for con-
trol.
trol.
2
CE
Chip enable pin.
Data written into an internal latch in a
timing of "H" to "L".
Each analog switch is activated.
Data transfer enabled at "H" level.
Data written into an internal latch in a
timing of "H" to "L".
Each analog switch is activated.
Data transfer enabled at "H" level.
3
VSS
Ground pin.
4
LOUT
Bass band filter comprising
capacitor and resistor connection pin
and bass/treble output pin.
capacitor and resistor connection pin
and bass/treble output pin.
5
LBASS
Bass band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
6
LTRE
Treble band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
7
LIN
Volume + equaliser output pin.
8
LSEL0
Input selector output pin.
9-12
L4-1
Input signal pin.
Pin No.
Terminal Name
Function
13-16
R1-4
Input signal pin.
17
RSEL0
Input selector output pin.
18
RIN
Volume + equaliser output pin
19
RTRE
Treble band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
20
RBASS
Bass band filter comprising capacitor
and resistor connection pin.
and resistor connection pin.
21
ROUT
Bass band filter comprising capacitor
and resistor connection pin and bass/
treble output pin.
and resistor connection pin and bass/
treble output pin.
22
VREF
0.5x VDD voltage generation block
for analog ground. Capacitor of sev-
eral 10µF to be connected between
VREF and AWSS (VSS) as a counter-
measure against power ripple.
for analog ground. Capacitor of sev-
eral 10µF to be connected between
VREF and AWSS (VSS) as a counter-
measure against power ripple.
23
VDD
Supply pin
24
CL
Serial data and clock input pin for con-
trol.
trol.
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
18
17
LVref
RVref
CONTROL
CIRCUIT
LOGIC
CIRCUIT
CONTROL
CIRCUIT
LOUT
LBASS
LIN
LSEL0
L4
L3
L2
L1
R1
R2
R3
R4
RSEL0
RIN
RTRE
LTRE
RBASS
ROUT
VREF
VDD
CL
DI
CE
VSS
CCB
INTERFACE
Figure 1 BLOCK DIAGRAM OF IC
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