Sharp XL-70 Service Manual page 47

IC804 VHiLA6541D/-1: Focus/Tracking/Spin/Sled Driver (LA6541D)
Pin No. Port Name
1 VCC
2 MUTE
3 VIN1
4 VG1
5 VO1
6 VO2
7 GND
8 GND
9 GND
10 VO3
11 VO4
12 VG2
13 VIN2
14 REG OUT
15 REG IN
16* RES
17* CD
18 VIN3
19* VG3
20 VO5
21 VO6
22 GND
23 GND
24 GND
25 VO7
26 VO8
27 VG4
28 VIN4
29 VREF
30 VCC
*GND (lowest potential) is connected to the frame of pin center.
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
IC804 VHiLA6541D/-1: Focus/Tracking/Spin/Sled Driver (LA6541D)
30 29
11kΩ
Level shift
Level shift
11kΩ
1 2
Power (short-circuited to pin 30)
All BTL AMP output ON/OFF
BTL AMP1 input terminal
BTL AMP1 input terminal (for gain adjustment)
BTL AMP1 output terminal (noninversion side)
BTL AMP1 output terminal (inversion side)
GND terminal (lowest potential)
GND terminal (lowest potential)
GND terminal (lowest potential)
Output terminal of BTL AMP2 (inversion side)
Output terminal of BTL AMP2 (noninversion side)
Input terminal of BTL AMP2 (for gain adjustment)
Input terminal of BTL AMP2
Connect the collector of externally provided transistor (PNP). 5V power output
Connect the base of externally provided transistor (PNP).
Reset output
Reset output delay time setting (capacitor provided externally)
Input terminal of BTL AMP3
Input terminal of BTL AMP3 (for gain adjustment)
Output terminal of BTL AMP3 (noninversion side)
Output terminal of BTL AMP3 (inversion side)
GND terminal (lowest potential)
GND terminal (lowest potential)
GND terminal (lowest potential)
Output terminal of BTL AMP4 (inversion side)
Output terminal of BTL AMP4 (noninversion side)
Input terminal of BTL AMP4 (for gain adjustment)
Input terminal of BTL AMP4
Application of standard voltage of level shift circuit
Power (short-circuited to pin 1)
28 27 26 25
BTL AMP
4
4
BTL AMP
1 1
3 4 5 6
Figure 47 BLOCK DIAGRAM OF IC
Function
24 23 22 21
Vcc
BTL AMP
BTL AMP
7 8 9 10
– 47 –
20 19 18 17
11kΩ
Level shift
3
3
Level shift
2
2
11kΩ
11 12 13 14
XL-70/70C
16
RESET
Regulator
15