3. Technical brief
- 34 -
3.12 Dual Mode Speaker and MIDI IC
(1) Dual Mode Speaker
There is a control signal (SPK_SEN) 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 (U203).
The dual mode speaker is placed in the front cover and contacted to main PCB.
A. Receiver Operation
The dual mode speaker is driven by VOUTNORP and VOUTNORN of AD6521 through an analog
switch (U203) 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 YMU762 (U204) through the analog
switch (U203) when it is used for loud speaker.
REC_SPK-
SPK-
SPK+
10p
C228
SP201
10p
C231
0.1u
C229
C230
0.1u
12
R215
3V3_VMIDI
C222
47p
VA201
AVL14K02200
C218
47p
2V8_VMEM
SP202
0
R211
R213
82K
33K
R212
C223
47p
C224
10p
2V8_VMEM
C220
1000p
R228
3.3K
100K
COM1
3
COM2
9
GND
6
4
IN1
8
IN2
NC1
5
7
NC2
2
NO1
10
NO2
1
V+
R217
NLAS4684MR2
U203
10p
C226
CN210
1
2
10p
C225
39p
C217
0
R208
C216
390p
R216
12
AVL14K02200
VA202
29
_IRQ
3
31
_RD
4
_RST
28
_WR
13
14
EQ3
HPOUT_L
10
HPOUT_R
11
IOVDD
32
2
LED
MTR
19
NC
5
6
PLLC
SPOUT1
17
18
SPOUT2
15
SPVDD
16
SPVSS
VDD
7
VREF
9
8
VSS
_CS
30
A0
1
CLK1
D0
27
D1
26
D2
25
D3
24
23
D4
22
D5
21
D6
20
D7
EQ1
12
EQ2
YMU762
U204
C227
0.1u
0.01u
C215
DATA09
DATA10
DATA11
DATA12
DATA13
DATA14
DATA15
MIDI_CS
MIDI_IRQ
RD
MIDI_RST
WR
13MHZ
SPK_SEL
REC_N
REC_P
ADD00
DATA08
Figure 3-18 Circuit Diagram of Dual Mode Speaker.
Summary of Contents for F7100
Page 1: ...Service Manual Model F7100 Service Manual F7100 P N MMBD0035501 Date July 2004 Issue 1 0 ...
Page 52: ...4 TROUBLE SHOOTIng 53 Graph 4 14 GSM TX Graph 4 15 DCS TX ...
Page 75: ...5 DISASSEMBLY INSTRUCTION 76 5 1 Disassembly 5 DISASSEMBLY INSTRUCTION 1 2 ...
Page 76: ...5 DISASSEMBLY INSTRUCTION 77 1 2 ...
Page 77: ...5 DISASSEMBLY INSTRUCTION 78 1 2 ...
Page 78: ...5 DISASSEMBLY INSTRUCTION 79 2 3 4 1 ...
Page 95: ... 96 9 PCB LAYOUT ...
Page 96: ... 97 9 PCB LAYOUT ...
Page 97: ... 98 Note ...
Page 105: ...11 STAND ALONE TEST 106 Figure 11 2 HW test setting Figure 11 3 Ramping profile ...
Page 109: ... 110 Note ...
Page 110: ... 111 13 EXPLODED VIEW REPLACEMENT PART LIST 13 1 Exploded View ...
Page 111: ... 112 Note ...
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