© 2002-3 PRINTED IN JAPAN
B51-7936-00 (N) 1889
Cord with plug
(E30-6099-05)
Metallic cabinet
(A01-2787-03)
Magic tape
(H30-0051-05)
Screw set
(N99-1631-05)
Microphone
(W01-1590-05)
GSM HANDS FREE INTERFACE UNIT
KCA-HF521
SERVICE MANUAL
KCA-HF521
2
BLOCK DIAGRAM
COMPONENTS DESCRIPTION
J1
H/U
(5L-I/F)
(5L-I/F)
CH
J2
B. U 5V
Q114
AUD 8V
Q112
IC14
SW 5V
IC15
SW 3.3V
SELECTOR
SYSTEM
IC11
u-COM
CHCON
Q104
RESET IC
IC12
BUDET SW
Q103
DSP
IC6
IC3
u-COM
IC2
+14dB
BUFFER AMP
IC10 (2/2)
Q101
IC5
FLASH MEMORY
+3.1dB
IC8 (2/2)
BUFFER AMP
BUFFER AMP
IC7 (1/2)
+40dB
+13.7dB
IC7 (2/2)
BUFFER AMP
MIC INPUT
J3
IC4
LATCH
IC9
E-VOL
IC16
0dB
BUFFER AMP
BUFFER AMP
+2.4dB
IC10 (1/2)
IC1
SRAM
Q102
DIP SW
S1
MAIN
I/F
CN1
FRASH2
IC13
RS232C DR.
J4
GSM I/F
SW
140mV
700mV
4.8mV
480mV
1mV : 400Hz
140mV
46mV
46mV
46mV
60mV
(VOL MAX)
1270mV
1270mV
GSM (TEL) : 700mV
CHANGER : 1270mV
B. U
Lch0
Rch0
MUTE0
DATAH0
CLK0
DATAC0
REQH0
REQC0
RESET0
CHCON0
RESET1
CHCON1
REQC1
REQH1
DATAC1
DATAH1
MUTE1
CLK1
Lch1
Rch1
B. U
(1)
(2)
(3)
(4)
CONT1
CONT2
CONT4
CONT3
REQC0
REQH0
DATAC0
DATAH0
CLK0
DATAH1
DATAC1
REQH1
REQC1
CLK1
CHCON0
CHCON1
B
.U
DET
RESET
P-ON
MUTE
RELA
Y1
RELA
Y2
P-ON2
DSPRST
P-DWN
RX
TX
RSOUT
V-OUT (SP)
V-IN (MIC)
5
5
RES-
IRQ2
AS-
NRESET
P-DWN
V-IN (TEL)
V-OUT (TEL)
A15
A8
AD7
AD0
A15
A8
Q7
Q0
8
8
8
A0
A7
Q0
Q7
D7
D0
TXD2
RXD2
WR-
RD-
SD0
SD7
A0
A15
816
D
ATA
B
U
S
ADRESS
B
U
S
P77
P70
8
IRQ1
IRQ0
MD1
MD0
RXD1
TXD1
TXD0
RXD0
5
TXD1
RXD1
W2
W1
JUMPER
RXD1
TXD0
RXD0
TXD1
V
O
ICE
OUT
V
O
ICE
IN
SW 3.3V
SW 3.3V
SW 5V
SW 5V
SW 5V
SW 5V
SW 5V
SW 5V
SW 3.3V
B. U 5V
B. U 5V
AUD 8V
q PROCESSOR UNIT (X32-5332-70)
Ref.No.
Element/Function
Operation/Condition
IC1
SRAM
For MAIN U-COM
IC2
ANALOG SW
CHANGER or HANDSFREE AUDIO SW
IC3
MAIN U-COM
Microcomputer for the GSM communication control
IC4
LATCH
Communication control IC5-6
IC5
ROM
DSP ROM for the software
IC6
DSP IC
IC7
OP AMP
Amplifier for the MIC input
IC8
OP AMP
Amplifier for the voice input from GSM / Ref potential (4V) OUT
IC9
Digital Potentiometer
AUDIO level adjustment by GSM from the DSP
IC10
OP AMP
AMP from the DSP to H/U / AMP from the DSP to GSM
IC11
SYSTEM U-COM
H/U And CHANGER (5L) The microcomputer for the communication control.
IC12
RESET IC
Detection voltage of 3.0V
IC13
RS232C Driver
IC for the GSM communication
IC14
Power supply IC
Main microcomputer system 5V AVR (SW5V)
IC15
Power supply IC
Power supply with 3.3V of DSP systems. IC14 ON at the time of 5VOUT.
IC16
OP AMP
Buffer AMP for IC9
Q100, 108
ANALOG SW CONT
IC2, Q106 SW control. Q100VB = H : For each SW-ON
Q101
DSP CONT
DSP P-DWN, RST each VB = H : ON
Q105
RESET CONT
VB = H : MAIN U-COM RESET
Q103
B.U DET
BU ON VC = L, OFF VC = H
Q104
CHANGER CONT
H/U use VC = L, not use VC = H
Q105
RESET CONT
VB = H : SYSTEM U-COM RESET
Q106
AUDIO GND SW
CHANGER or HANDSFREE AUDIO GND switching SW
Q107
SW5V SW
IC14 VB = Hi-Z : ON, VB = H : OFF
Q110
AUDIO8V SW
(NPN) VB = H : ON
Q111, 112
AUDIO8V AVR
(Q111) VB = H : 8VOUT
Q113, 114
B.U5V AVR
(Q113) VB = H : 5VOUT
KCA-HF521
3
MICROCOMPUTER'S TERMINAL DESCRIPTION
q SYSTEM µ-COM uPD780058 (IC11 : X32)
Pin No.
Pin name
I/O
Description
Processing Operation
1-3
NC
O
Not used
4
AVSS
O
D/A, A/D Ground terminal
5, 6
NC
O
Not used
7
AVREF1
O
D/A Standard voltage input terminal
8
RX
I
Communication line with MAIN (reception)
9
TX
O
Communication line with MAIN (transmission)
10
NC
O
Not used
11
DATAH0
I
Data input from H/U
12
DATAC0
O
Data output to H/U
13
HCLK0
I/O
Clock input from H/U
14
REQC0
O
Communication request to H/U
15
NC
O
Not used
16
DATAC1
I
Data input from CD-CH
17
DATAH1
O
Data output to CD-CH
18
HCLK1
I/O
Clock output to CD-CH
19
REQH1
O
Communication request to CD-CH
20
CHCONO1
O
CD-CH system output
21
RELAY1
O
Relay control
H : OPEN
L : connect
22
RELAY2
O
Relay control
H : CD-CH
L : HF
23
NC
O
Not used
24
DSPRST
O
DPS chip reset output
H : reset
25
P-DWN
O
DSP chip power supply control line
H : power down
26
MUTE
O
5L mute control line
27
PON
O
Power supply control line
H : ON
L : OFF
28
RSOUT
O
Reset output to the CPU
H : reset
29
STBY
O
Not used
30
LED0
O
LED0
L : ON
31
LED1
O
LED1
L : ON
32
LED2
O
LED2
L : ON
33
VSS1
-
Ground terminal
34-58
NC
O
Not used
59
PON2
O
Power supply control line
H : P-on
L : P-off
60
RESET
I
System reset input terminal
L : reset
61
REQH0
I
Communication request input from H/U
62
BUDET
I
Moment decrease voltage detection input
63, 64
NC
O
Not used
65
REQC1
I
Communication request input from CD-CH
66
CHCON1
I
CD-CH system input from H/U
67
VSS0
-
Ground terminal in the port part
68
VDD1
-
Power supply supply terminal (5V)
69
X2
-
Crystal connection terminal for the main system clock
70
X1
I
Crystal connection terminal for the main system clock
71
VPP
-
Inner connection terminal
72, 73
NC
O
Not used
74
VDD0
-
Positive power supply input terminal in the port part
75
AVREF0
-
A/D standard voltage input terminal
76-80
NC
O
Not used
KCA-HF521
4
MICROCOMPUTER'S TERMINAL DESCRIPTION
q MAIN µ-COM HD64F2138 (IC3 : X32)
Pin No.
Pin name
I/O
Description
1
RES-
I
Reset input
L : reset
2
XTAL
I
Crystal resonator input 18.432MHz
3
EXTAL
I
Crystal resonator input 18.432MHz
4
MD1
I
Mode terminal
H : mode 2 selection
5
MD0
I
Mode terminal
L : mode 2 selection
6
NMI
I
Not used (H fix)
7
STBY-
I
Standby terminal
L : standby (H fix)
8
VCC2
Power supply (SW 5V)
9
SCK0/P52
O
Not used
10
RXD0
I
Serial reception terminal 0ch
11
TXD0
O
Serial transmission terminal 0ch
12
VSS
Ground terminal
13
WAIT-
I
Not used (H fix)
14
NC
O
Not used
15
AS-
O
Address strobe terminal
L : Active
16
WR-
O
Writing terminal
L : Active
17
RD-
O
Reading terminal
L : Active
18
P92
I
P92 (for FLASH2)
19
P91
I
P91 (for FLASH2)
20
P90
I
P90 (for FLASH2)
21, 22
NC
O
Not used
23
P62
O
Electronic volume CS
24
P63
O
Electronic volume INC
25
P64
O
Electronic volume U/D
26-28
NC
O
Not used
29
AVCC
Analog power supply (SW5V)
30
(DIP1) P70
I
DIP SW 1 input
31
(DIP2) P71
I
DIP SW 2 input
32
(DIP3) P72
I
DIP SW 3 input
33
(DIP4) P73
I
DIP SW 4 input
34
(DIP5) P74
I
DIP SW 5 input
35
(DIP6) P75
I
DIP SW 6 input
36
(DIP7) P76
I
DIP SW 7 input
37
(DIP8) P77
I
DIP SW 8 input
38
AVSS
Analog ground terminal
39
TXD2/P40
O
Serial transmission terminal 2ch
40
RXD2/P41
I
Serial reception terminal 2ch
41
SCK2/P42
O
Not used
42-46
NC
O
Not used
47
VCC1
Power supply (SW5V)
48-55
A15-8
O
Address bus
56
VSS
Ground terminal
57-64
A7-0
O
Address bus
65-72
D0-7
I/O
Data bus
73
VSS
Ground terminal
74-77
NC
O
Not used
78
TXD1
O
Serial transmission terminal 1ch
79
RXD1
I
Serial reception terminal 1ch
80
SCK1/P86
O
Not used
A
B
C
D
E
F
G
H
I
J
1
2
3
4
5
6
7
56
PC BOARD (COMPONENT SIDE VIEW)
PC BOARD (FOIL SIDE VIEW)
Refer to the schematic diagram for the values of resistors and capacitors.
Ref. No address
IC1
6B
IC3
6C
IC4
3B
IC5
3B
IC6
4B
IC9
5B
IC11
2C
IC12
2B
IC13
5C
IC14
2B
IC15
3A
IC16
5B
Q100
3C
Q101
3B
Q103
2C
Q104
2C
Q105
2B
Q106
3C
Q107
2B
Q108
3C
Q110
1C
Q111
2C
Q113
2C
X32-5332-70
Ref. No address
IC2
3H
IC7
5I
IC8
4H
IC10
5H
Q102
6H
Q112
2H
Q114
2H
X32-5332-70
X2
C38
R101
C39
C43
R158
R157
R161
R104
R103
R112
R156
R164
R160
R159
R165
R162
R163
C72
R108
R110
R111
R107
R105
R109
R106
R123
C51
C49
R56
R73
C45
C33
R43
R54
R100
R50
R44
R32
R29
R39
R37
R38
R45
R46
R51
C47
R53
R48
C17
C20
CP21
R121
R122
R117
R126
C141
R144
R28
C142
R61
C56
R23
R27
R26
R21
CP22
CP12
CP20
CP15
CP23
R124
R147
CP10
CP6
CP8
CP11
CP7
R80
R64
C135
R102
W1
W2
C37
R114
R125
C73
R138
R13
CP2
R82
R139
R84
R86
R3
R137
R60
R75
R47
R93
CP3
R92
C14
C44
C59
C66
C50
CP5
CP14
R74
C36
C41
R120
C114
1
5
60
41
20
1
21
40
61
80
1
10
20
11
1
16
32
17
I
O
G
1
20
41
60
80
61
21
40
1
9
1
2
10
8
9
16
1
116
89
4
8
5
1
34
5
1
20
41
60
100
61
21
40
1
16
32
17
3
4
2
1
EB
B
BE
E
B
EB
B
EC
BE
C
E
BE
1
5
8
12
9
13
4
1
5
8
12
9
13
4
B
EB
EE
B
E
B
B
E
B
B
FLASH2
Vpp
GND
5V
TXD0
SI0
RXD0
1
C124
C103
C27
C29
C125
C131
C132
C104
C115
C62
C121
L104
C120
C101
X1
C136
X100
C52
C31
C32
C46
C53
C55
C54
C143
C60
C61
SO0
SCK0
10
Q107
Q106
D115
D116
D8
T
O
HEAD
UNIT
T
O
CHANGER
T
O
GSM
T
O
MICR
OPHONE
GSM
MODEL
SELECT
SWITCH
Q105
Q111
D109
D117
D13
D2
Q110
Q101
Q100
D112
D100
D113
D101
IC15
D1
IC12
D106
IC1
Q113
D107
D104
D9
Q103
Q104
D111
D14
Q108
IC4
IC14
IC6
IC5
IC3
IC9
IC13
IC16
IC11
X32-5332-70 (J74-1308-12)
CN1
S1
J3
J1
J2
J4
E
B
B
E
B
E
C74
C69
C64
C48
R63
R69
R55
R58
C40
R59
R72
C34
C35
R41
R42
C16
C15
C12
C13
C22
C23
C21
C19
C11
C2
C5
C3
C1
C4
C133
C10
C8
C6
C7
C30
C65
C26
C28
C24
C25
R140
R142
R141
C122
C118
C9
C130
C111
C110
C106
C112
C109
C116
C137
C144
R1
R7
R8
C100
R81
R116
R17
C57
R49
R166
R167
R83
R87
R85
R18
R19
R6
R5
R4
R115
R145
R146
R90
R91
R2
C70
R62
C63
C71
R16
R15
R14
R12
R11
R10
R9
R71
C42
14
85
58
41
14
5
8
17
14
8
Q102
IC10
D108
D3
IC2
Q112
D4
D11
D5
D10
D6
Q114
D103
IC8
IC7
D110
X32-5332-70 (J74-1308-12)