— 6 —
FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
POWER AMPLIFIER (IC201: TA8248K)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC201.
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
Amp.
TA8248K
Filter
Block
CPU
MSM6755B-17
Summary of Contents for CTK-501
Page 11: ...9 PRINTED CIRCUIT BOARDS Main PCB JCM443 MA1M Top View Bottom View 5 2 1 3 4 8 9 6 7...
Page 12: ...11 SCHEMATIC DIAGRAMS Main PCB JCM443 MA1M 1 7 6 2 3 4 5 9 8...
Page 13: ...12 Sub PCB JCM443 MA2M...
Page 14: ...13 Console PCBs JCM443 CN1M CN2M...
Page 15: ...14 Keyboard PCBs JCM6112K KY1M KY2M...
Page 17: ...16 EXPLODED VIEW 13 13 16 17 18 19 20 21 15 22 23 R 1 R 2 2 4 3 1 6 5 8 7 9 14 10 12 11 R 3...
Page 21: ...MA0600571A...
