— 10 —
POWER AMPLIFIER (IC301: TA8248K)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC301.
Pin No.
Terminal
In/Out
Function
1
NC
—
Not used
2
B.S.2
—
Terminal for a bootstrap capacitor
3
OUT2
Out
Channel 2 output
4
VCC
In
+9 V source
5
OUT1
Out
Channel 1 output
6
B.S.1
—
Terminal for a bootstrap capacitor
7
Power GND
In
Ground (0 V) source
8
Stand by
In
Power control signal input. 0 V: Off, +9 V: On
9
DC
—
Terminal for a decoupling capacitor
10
NF1
In
Negative feedback input
11
IN1
In
Channel 1 input
12
IN2
In
Channel 2 input
13
NF2
In
Negative feedback input
14, 15
Pre GND
In
Ground (0 V) source
Summary of Contents for CTK-631
Page 16: ... 14 PRINTED CIRCUIT BOARDS Main PCB JCM454 MA1M Top View Bottom View 2 10 9 3 8 1 4 7 5 6 ...
Page 17: ... 15 Sub PCB KDM454 MA2M 12 11 ...
Page 18: ... 16 LCD PCB JCM454 LCD1M A Top View Bottom View ...
Page 19: ... 17 SCHEMATIC DIAGRAMS Main PCB JCM454 MA1M 2 10 6 6 3 4 1 5 6 9 ...
Page 20: ... 18 Sub PCB KDM454 MA2M 12 11 ...
Page 21: ... 19 Display PCB JCM454 LCD1M ...
Page 22: ... 20 Keyboard PCBs JCM617T KY1M KY2M ...
Page 23: ... 21 PCBs JCM454 CN1M JCM454 CN2M JCM454 CN3M JCM454 CN4M ...
