— 7 —
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
Содержание CTK-541
Страница 1: ...ELECTRONIC KEYBOARD CTK 541 JULY 1999 CTK 541 E E E...
Страница 13: ...11 PRINTED CIRCUIT BOARDS Main PCB JCM456 MA1M Main PCB JCM456 MA1M Top View Bottom View 1 7 8 6 6 5 2 4 3...
Страница 14: ...12 Sub PCB JCM453 MA2M Top View Bottom View Sub PCB JCM453 MA2M...
Страница 15: ...13 Console PCB JCM453 CN1 Top View Bottom View Console PCB JCM453 CN1...
Страница 17: ...15 SCHEMATIC DIAGRAMS Main PCB JCM456 MA1M 1 6 7 2 3 4 5 9 8...
Страница 18: ...16 Sub PCB KDM453 MA2M...
Страница 19: ...17 Console PCBs JCM453 CN1...
Страница 20: ...18 Keyboard PCBs JCM618T KY1M KY2M...
