3. TECHNICAL BRIEF
- 31 -
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.
VA2
0
1
8
0
2
C
p
7
4
2
1
2
C
p
9
3
10
0
K
R2
0
9
SP2
0
1
0
0
2
N
C
1
2
SP2
0
0
VA2
0
0
1
1
2
C
p
9
3
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
0
1
NO2
1
V+
N
E
_
V
C
R
_
K
P
S
2V8_VMEM
C200
U201
NLAS468MR2
39p
C207
39p
C210
39p
R207
RCVN
RCVP
4.7
R206
4.7
Figure 3-18 Circuit Diagram pf Dual Mode Speaker
Summary of Contents for G1610
Page 1: ...Service Manual Model G1610 Service Manual G1610 P N MMBD0045701 Date February 2005 Issue 1 0 ...
Page 52: ...4 TROUBLE SHOOTING 51 Graph 4 14DCS TX Graph 4 15EGSM TX VC1 VC2 VC1 VC2 VC1 VC2 VC1 VC2 ...
Page 70: ...5 DISASSEMBLY INSTRUCTION 69 5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 ...
Page 71: ...5 DISASSEMBLY INSTRUCTION 70 Figure 5 3 Figure 5 4 ...
Page 72: ...5 DISASSEMBLY INSTRUCTION 71 Figure 5 5 ...
Page 73: ...5 DISASSEMBLY INSTRUCTION 72 Figure 5 6 1 3 2 4 Figure 5 7 1 2 3 ...
Page 74: ...5 DISASSEMBLY INSTRUCTION 73 Figure 5 8 4 2 3 1 2 1 Figure 5 9 ...
Page 75: ...5 DISASSEMBLY INSTRUCTION 74 Figure 5 10 ...
Page 86: ...7 BLOCK DIAGRAM 85 7 BLOCK DIAGRAM Power supply ...
Page 87: ... 86 ...
Page 108: ...12 AUTO CALIBRATION 107 12 3 Equipment Setup Figure 12 1 Equipment Setup ...
Page 111: ...12 AUTO CALIBRATION 110 ...