Sharp XL-30H Service Manual page 51

IC804 VHiLA6541D/-1: Focus/Tracking/Spin/Sled Driver (LA6541D)
Pin No. Port Name
1 VCC Power (short-circuited to pin 30)
2 MUTE All BTL AMP output ON/OFF
3 VIN1 BTL AMP1 input terminal
4 VG1 BTL AMP1 input terminal (for gain adjustment)
5 VO1 BTL AMP1 output terminal (noninversion side)
6 VO2 BTL AMP1 output terminal (inversion side)
7 GND GND terminal (lowest potential)
8 GND GND terminal (lowest potential)
9 GND GND terminal (lowest potential)
10 VO3 Output terminal of BTL AMP2 (inversion side)
11 VO4 Output terminal of BTL AMP2 (noninversion side)
12 VG2 Input terminal of BTL AMP2 (for gain adjustment)
13 VIN2 Input terminal of BTL AMP2
14 REG OUT Connect the collector of externally provided transistor (PNP). 5V power output
15 REG IN Connect the base of externally provided transistor (PNP).
16* RES Reset output
17* CD Reset output delay time setting (capacitor provided externally)
18 VIN3 Input terminal of BTL AMP3
19* VG3 Input terminal of BTL AMP3 (for gain adjustment)
20 VO5 Output terminal of BTL AMP3 (noninversion side)
21 VO6 Output terminal of BTL AMP3 (inversion side)
22 GND GND terminal (lowest potential)
23 GND GND terminal (lowest potential)
24 GND GND terminal (lowest potential)
25 VO7 Output terminal of BTL AMP4 (inversion side)
26 VO8 Output terminal of BTL AMP4 (noninversion side)
27 VG4 Input terminal of BTL AMP4 (for gain adjustment)
28 VIN4 Input terminal of BTL AMP4
29 VREF Application of standard voltage of level shift circuit
30 VCC Power (short-circuited to pin 1)
*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.
30 29 28
11kΩ
Level shift
4
Level shift
1
11kΩ
1 2 3
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27 26 25 24
Vcc
BTL AMP
4
BTL AMP
1
4 5 6 7
Figure 51 BLOCK DIAGRAM OF IC
– 51 –
Function
23 22 21 20
BTL AMP
3
BTL AMP
2
8 9 10 11
XL-30H/30W
19 18 17 16
11kΩ
Level shift
RESET
3
Level shift
Regulator
2
11kΩ
12 13 14 15