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3.12 Dual Mode Speaker and MIDI IC
(1) Dual Mode Speaker
There is a control signal (SPK_RCV_EN) which is for enabling receiver or speaker because one
dual mode speaker is used for both receiver and speaker. The signal is produced by AD6525
and controls the analog switch (U201).
The dual mode speaker is placed in the front cover and contacted to PCB.
A. Receiver Operation
The dual mode speaker is driven by VOUTNORP and VOUTNORN of AD6521 through a
analog switch (U201) when it is used for receiver. The gain is controlled by the PGA in
AD6521.
B. Speaker Operation
The dual mode speaker is driven by SPOUT1 and SPOUT2 of YMU759B (U200) through the
analog switch (U201) when it is used for loud speaker.
Figure 3-18. Circuit Diagram of Dual Mode Speaker.
3. TECHNICAL BRIEF
39p
C207
39p
C200
C212
39p
VA200
R234
0
4.7
R207
0
R236
VA201
5
7
NC2
2
NO1
10
NO2
1
V+
NLAS4684MR2
U201
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
CN200
1
2
R206
4.7
R209
100K
39p
C210
SP201
C208
47p
SP200
C211
39p
RCVP
RCVN
SPK_RCV_EN
Summary of Contents for C3100
Page 1: ...Service Manual Model C3100 Service Manual C3100 P N MMBD0033001 Date June 2004 Issue 1 0 ...
Page 51: ...Graph 4 15 EGSM TX 50 VCX VC2 VCX VC2 4 TROUBLE SHOOTING Graph 4 14 DCS TX ...
Page 67: ...5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 66 5 DISASSEMBLY INSTRUCTION ...
Page 68: ... 67 5 DISASSEMBLY INSTRUCTION Figure 5 3 Figure 5 4 ...
Page 69: ... 68 Figure 5 5 5 DISASSEMBLY INSTRUCTION ...
Page 70: ... 69 5 DISASSEMBLY INSTRUCTION Figure 5 6 Figure 5 7 1 3 2 4 1 2 3 ...
Page 71: ... 70 Figure 5 8 Figure 5 9 5 DISASSEMBLY INSTRUCTION 4 2 3 1 2 1 ...
Page 72: ... 71 5 DISASSEMBLY INSTRUCTION Figure 5 10 ...
Page 83: ... 82 7 BLOCK DIAGRAM 7 BLOCK DIAGRAM Power supply ...
Page 90: ... 89 9 PCB LAYOUT 9 PCB LAYOUT ...
Page 91: ... 90 9 PCB LAYOUT ...
Page 98: ... 97 11 3 HW Test Software for Standalone Test Setup 11 STAND ALONE TEST ...
Page 100: ... 99 Tx Stand alone Test Setting 11 STAND ALONE TEST ...
Page 102: ... 101 Rx Stand alone Test Setting 11 STAND ALONE TEST ...
Page 104: ... 103 12 3 Equipment Setup Figure 12 1 Equipment Setup 12 AUTO CALIBRATION ...
Page 107: ... 106 12 AUTO CALIBRATION ...
Page 109: ... 108 13 EXPLODED VIEW REPLACEMENT PART LIST ...