— 11 —
POWER AMPLIFIER (IC301: LA4620)
The power amplifier is a two-channel amplifier with standby switch.
6
16
2
10
11
13
12
Pre-drive
Amp.
Input
Amp.
Power
Amp.
+
–
Pre-drive
Amp.
Input
Amp.
Power
Amp.
+
–
9
7
3
5
+
–
Input
Amp.
Pre-drive
Amp.
Power
Amp.
+
–
Input
Amp.
Pre-drive
Amp.
Power
Amp.
4
19
20
21
22
23
1
18
17
15
14
8
RL Short
Protector
RL Short
Protector
Terminal
Protection
Circuit
Pop Noise
Prevention
Circuit
Ripple
Filter
IN11+
IN11–
IN12–
IN21+
IN21–
IN22–
NC
DC
MUTE
ADJ
Boot11
OUT11
PoGND1
OUT12
Boot12
VCC1
Boot21
OUT21
PoGND2
OUT22
Boot22
VCC2
PriGND
Summary of Contents for WK-1200
Page 16: ...15 SCHEMATIC DIAGRAMS Main PCB JCM730 MA1M 8 7 2 3 1 4 6 5...
Page 17: ...16 Sub PCB JCM730 MA2M 10 9...
Page 18: ...17 Console PCBs JCM730 CN1M CN2M CN3M CN4M...
Page 19: ...18 LCD Driver PCB JCM730 LCD1M...
Page 20: ...19 Keyboard PCBs JCM731T KY1M KY2M KY3M...
Page 25: ...8 11 10 Nishi Shinjuku Shinjuku ku Tokyo 160 Japan Telephone 03 3347 4926 MA0700571A...
