Sharp CD-SW340H Service Manual ▷ View online
CD-SW340H
7 – 2
Although a CD is inserted and the cover is closed,
"NO DISC" is displayed.
"NO DISC" is displayed.
(1) Focus-RF system check.
Press the Tray1 CD Eject Button without inserting a disc, and try
starting the playback operation.
starting the playback operation.
Figure 1
IC1
IC1
1
22
23
2
FDO
TDO
1. Does the pickup move to the PICKUP-IN Switch (NSW1)
position ?
position ?
No
Sled motor (NM2).
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 Q1 peripheral circuit.
Yes
4. Is the turntable rotating ?
No
Spindle motor (NM1).
When a disc is loaded, start playback operation.
1. Is focus servo activated ?
(Waveform drawing Figure 2)
(Waveform drawing Figure 2)
No
Pins 5~9, 11, 18 19 and 22 on IC1
Check the laser diode driver Q1 peripheral circuit.
Check the laser diode driver Q1 peripheral circuit.
Yes
2. Is the RF waveform normal ?
(Waveform drawing Figure 3)
(Waveform drawing Figure 3)
No
If the level is not normal.
Figure 2
IC1
IC1
22
16
3
1
FDO
TE
Figure 3
IC1
2
RFOUT
4
CD-SW340H
7 – 3
Check the TE waveform at pin 16 on IC1.
(2) Focus-RF 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 pins 15, 16 and 23 on IC1,
and FFC1.
Check the peripheral circuits at pins 15, 16 and 23 on IC1,
and FFC1.
No
"Initialization" is possible, but play is not possible ?
Yes
A normal jump operation cannot be completed or the begin-
ning of the track cannot be found.
Check the around pin 23 on IC1.
ning of the track cannot be found.
Check the around pin 23 on IC1.
No
"Initialization" is not possible.
Data cannot be read. Check the VCO-PLL (Pin26~30 on IC1)
system.
system.
Figure 4
IC1
IC1
TE
16
RFOUT
2
3
4
(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 pin 25 on IC1, pins 1 and 2 on CNP2.
Figure 5
IC1
IC1
22
25
5
1
FDO
SPDO
CD-SW340H
7 – 4
(4) PLL system check.
When a disc is loaded, start play operation.
The RF waveform is normal, but the TOC data cannot be read.
Check the PDOUT waveform. (Figure 6)
Check around pins 26~30 on IC1.
Figure 6
IC1
IC1
IC1
28
22
27
1
7
6
PDOUT 1
PDOUT 0
FDO
CD-SW340H
8 – 1
CHAPTER 8. OTHERS
[1] Function Table Of IC
IC1 VHiLC78690E-1: CD Servo (LC78690E) (1/2)
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Pin No.
Terminal Name
Input/Output
Setting in Reset
Function
1
EFMIN
Input
INPUT
RF signal input pin.
2
RFOUT
Output
UNSTABLE
RF signal output pin.
3
LPF
Output
UNSTABLE
RF signal DC level detection. LPF capacitor connection pin.
4
PHLPF
Output
UNSTABLE
LPF capacitor pin for detection problem.
5
AIN
Input
INPUT
A signal input pin.
6
CIN
Input
INPUT
C signal input pin.
7
BIN
Input
INPUT
B signal input pin.
8
DIN
Input
INPUT
D signal input pin.
9
FEC
Output
UNSTABLE
FE signal LPF capacitor connection pin.
10*
RFMON
Output
UNSTABLE
Built in analog signal for monitoring LSI pin.
11
VREF
Output
AVDD/2
VREF voltage output pin.
12
JITTC
Output
UNSTABLE
Jitter detection capacitor connection pin.
13
EIN
Input
INPUT
E signal input pin.
14
FIN
Input
INPUT
F signal input pin.
15
TEC
Output
UNSTABLE
TE signal LPF capacitor connection pin.
16
TE
Output
UNSTABLE
TE signal output pin.
17
TEIN
Input
INPUT
TES signal generation TE signal input pin.
18
LDD
Output
UNSTABLE
Laser power control signal output pin.
19
LDS
Input
INPUT
Laser power control signal input pin.
20
AVSS
—
—
Analog GND pin. This pin must always be connected to 0V.
21
AVDD
—
—
Analog power supply pin.
22
FDO
Output
AVDD/2
Focus control output pin. D/A converter output.
23
TDO
Output
AVDD/2
Tracking control output pin. D/A converter output.
24
SLDO
Output
AVDD/2
SLED control output pin. D/A converter output.
25
SPDO
Output
AVDD/2
SPINDLE control output pin. D/A converter output.
26
VVSS1
—
—
For use
by the
EFM
PLL
Circuit
by the
EFM
PLL
Circuit
Built-in VCO GND pin. This pin must always be connected to 0V.
27
PDOUT1
Output
UNSTABLE
Phase comparison output pin 1 to control built in VCO.
28
PDOUT0
Output
UNSTABLE
Phase comparison output pin 0 to control built in VCO.
29
PCKIST
Input
INPUT
Resistor connection pin to set current for PDOUT 0 and 1 output.
30
VVDD1
—
—
Built_in VCO power supply pin 1.
31*
DMUTEB
Output
L
DMUTEB output pin.
32
PUIN
Input/Output
INPUT
PUIN input pin. (built-in pull-up resistor)
33*
DEFECT
Output
L
DEFECT signal output pin.
34*
FSEQ
Output
L
Detected sync signal output. This signal is high when the sync signal
detected from the EFM signal and the internally generated sync signal
agree.
detected from the EFM signal and the internally generated sync signal
agree.
35*
C2F
Output
L
C2 error flag monitor output pin.
36
DVDD
—
—
Digital power supply pin.
37
DVSS
—
—
Digital GND pin. This pin must always be connected to 0V.
38
DVDD1.8
Output
H
Supply voltage connect to capacitor for digital circuit.
39
VDD3
—
—
Built-in VCO power supply pin 3.
40
VVSS3
—
—
Built-in VCO GND pin 3. This pin must always be connected to 0V.
41
DVDD
—
—
Digital power supply pin.
42
DVSS
—
—
Digital GND pin. This pin must always be connected to 0V.
43
CE
Input
INPUT
Micro-
Com-
puter
Inter-
face
Com-
puter
Inter-
face
Chip enable signal input pin.
44
CL
Input
INPUT
Data transfer clock input pin.
45
DI
Input
INPUT
Data input pin.
46
DO
Output
H
Data output pin. (TRI-State Output)
47
RESB
Input
—
Reset input pin for LSI. This pin must set to low briefly after power is
applied.
applied.
48
INTB0
Output
H
Interrupt signal output pin 0. (SERVO Section)
49
INTB1
Output
H
Interrupt signal output pin 1. (DECODER Section)
50
ICONT2
Input/Output
INPUT
General Purpose I/O pin 2 Controlled by command from the microproces-
sor. Any of these that are unused must be
either set up as input pin ports and connected
to 0V, or set up as output pin ports and left
open.
either set up as input pin ports and connected
to 0V, or set up as output pin ports and left
open.
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