Sharp XL-DAB227NH (serv.man4) Service Manual ▷ View online
XL-DAB227NH
7 – 4
The RF waveform is normal and the time is displayed
normally, but no sound is produced. Or the sound has
dropouts.
normally, but no sound is produced. Or the sound has
dropouts.
(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 TMAX waveform. (Figure 6)
Check around Pins 72, 73, 74, 75, 76 and 78 on IC1.
Figure 6
IC1
IC1
IC1
IC1
9
13
76
74
7
8
6
1
FOO
DMO
LPFO
TMAX
(5) Others.
Is pin 65, 66 and 67 on IC1. (Figure 7)
No
There are too many error flags on a damaged disc which makes
error correction impossible.
error correction impossible.
Yes
Check again using a known good disc.
If OK, Check the unit.
Figure 7
IC1
IC1
IC1
67
66
65
9
10
11
BCKI
AIN
LRCKI
XL-DAB227NH
8 – 1
CHAPTER 8. OTHER
[1] Function Table Of IC
IC2 VHILA6261//-1: Focus/Tracking/Spin/Sled Driver (LA6261)
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
* Set power system GND to the minimum potential together with SGND.
* Short-circuit three pins of power system SVSS and PVCC1 externally before use.
Pin No.
Terminal Name
Function
1
FO+
BTL Output pin (+) for focus coil.
2
FO-
BTL Output pin (-) for focus coil.
3
SP+
BTL Output pin (+) for spin motor.
4
SP-
BTL Output pin (-) for spin motor.
5
SL-
BTL Output pin (+) for slide motor.
6
SL+
BTL Output pin (-) for slide motor.
7
PGND1
Power GND for channels 1,2,3 and 4 (BTL).
8
REGIN
Regulator pin (External PNP base).
9
PVCC1
Power for channels 1,2,3 and 4 (BTL). (SVCC short-crircuited)
10
REGOUT
Regulator pin (External PNP collector).
11
VIN1
Input pin for channel 1
12*
VIN1G
Input pin for channel 1 (for gain control)
13
VIN2
Input pin for channel 2
14*
VIN2G
Input pin for channel 2 (for gain control)
15
VIN3
Input pin for channel 3
16*
VIN3G
Input pin for channel 3 (for gain control)
17
VIN4
Input pin for channel 4
18*
VIN4G
Input pin for channel 4 (for gain control)
19
FWD5
CH5 Output change pin (FWD). Logic input for bridge.
20
REV5
CH5 Output change pin (REV). Logic input for bridge.
21
VCONT5
Input pin for CH5 output voltage control.
22
FWD6
CH6 Output change pin (FWD). Logic input for bridge.
23
REV6
CH6 Output change pin (REV). Logic input for bridge.
24
VCONT6
Input pin for CH5 output voltage control.
25
VREFIN
Reference voltage input pin.
26
SGND
Signal system GND.
27
SVCC
Signal system power (PVCC1 short - circuited).
28
PVCC2
Power for channel 5 and 6 (H bridge).
29
MUTE
Input pin for BTL mute.
30
PGND2
Power GND for channels 5 and 6 (H bridge).
31
TR+
H bridge Output pin (+) for tray motor.
32
TR-
H bridge Output pin (-) for tray motor.
33
CAM+
H bridge Output pin (+) for cam motor.
34
CAM-
H bridge Output pin (-) for cam motor.
35
TR+
BTL Output pin (+) for tracking coil.
36
TR-
BTL Output pin (-) for tracking coil.
XL-DAB227NH
8 – 2
IC2 VHILA6261//-1: Focus/Tracking/Spin/Sled Driver (LA6261)
Figure 8-1 BLOCK DIAGRAM OF IC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
+
-
11k
22k
1k
1k
1k
1k
11k
11k
11k
22k
22k
22k
-
+
-
+
Pre
Dr
iv
e
Pre
Dr
iv
e
+
-
+
-
+
-
Refcronce
voltage
DUFFER AMP
For 1/2 VCC
DUFFER AMP
For VREF
TSD
Bandgad
BTL
Mode
select
Mode
select
CH4
CH5
CH6
CH3
CH2
CH1
VOLTAGE
CONTROL AMP
XL-DAB227NH
8 – 3
IC1 VHITC94A70FG2: CD MP3 DECODER (1/4)
Pin Description
Pin Description
Figure 8-2 BLOCK DIAGRAM OF IC
Click on the first or last page to see other XL-DAB227NH (serv.man4) service manuals if exist.