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SERVICE MANUAL
For Technical Service
US Model
MP-7001SC/7001SM/7001SP/
7001SS/7001ST
TABLE OF CONTENTS
1.
TOOLS .......................................................................... 2
2.
ELECTRICAL ADJUSTMENTS
PD Voltage Adjustment ...................................................
3
Local Frequency Adjustment ..........................................
4
Antenna Adjustment ........................................................
4
3.
DIAGRAMS
3-1. Block Diagram ................................................................
5
3-2. Printed Wiring Boards .....................................................
8
3-3. Schematic Diagram ......................................................... 11
3-4. IC Pin Function Description ........................................... 17
4.
ELECTRICAL PARTS LIST ............................... 19
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing repairing.
· Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
· Be careful not to apply force on the conductor when soldering
or unsoldering.
Notes on chip component replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
SKYTEL
Ver 1.0 1999. 11
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2
MANIAL
SECTION 1
TOOLS
Fig.
Description
Part No.
Remarks
1
Programming Jig
J-2503-006-A Include 23456
2
Programming Jig
J-2502-043-2
3 ROM Writer Software J-2503-007-A
Fig.
Description
Part No.
Remarks
4
Manual
J-2503-008-A
5
AC Adaptor
1-473-709-11
6
Cable (RS-232C)
1-777-797-12
2 Programming Jig
3 ROM Writer Software
4 Manual
5 AC Adaptor
6 Cable (RS-232C)
1
[ Connecting the Set and Programming Jig ]
1 Peel off the label (Blank) on the back of the pager cabinet.
2 Remove the batteries.
3 Set the pager in the programming jig.
4 Lower the programming jig clamp and secure the pager in place.
3
4
1 Label (Blank)
2 Dry Battery
Set
IBM-PC (not supplied)
Cable
(RS-232C)
9 pin
D-Sub
25 pin
D-Sub
Programming Jig
AC Adaptor
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3
SECTION 2
ELECTRICAL ADJUSTMENTS
Channel
Frequency
Channel
Frequency
1
929.0125
61
930.5125
2
929.0375
62
930.5375
3
929.0625
63
930.5625
4
929.0875
64
930.5875
5
929.1125
65
930.6125
6
929.1375
66
930.6375
7
929.1625
67
930.6625
8
929.1875
68
930.6875
9
929.2125
69
930.7125
10
929.2375
70
930.7375
11
929.2625
71
930.7625
12
929.2875
72
930.7875
13
929.3125
73
930.8125
14
929.3375
74
930.8375
15
929.3625
75
930.8625
16
929.3875
76
930.8875
17
929.4125
77
930.9125
18
929.4375
78
930.9375
19
929.4625
79
930.9625
20
929.4875
80
930.9875
21
929.5125
81
931.0125
22
929.5375
82
931.0375
23
929.5625
83
931.0625
24
929.5875
84
931.0875
25
929.6125
85
931.1125
26
929.6375
86
931.1375
27
929.6625
87
931.1625
28
929.6875
88
931.1875
29
929.7125
89
931.2125
30
929.7375
90
931.2375
31
929.7625
91
931.2625
32
929.7875
92
931.2875
33
929.8125
93
931.3125
34
929.8375
94
931.3375
35
929.8625
95
931.3625
36
929.8875
96
931.3875
37
929.9125
97
931.4125
38
929.9375
98
931.4375
39
929.9625
99
931.4625
40
929.9875
100
931.4875
41
930.0125
101
931.5125
42
930.0375
102
931.5375
43
930.0625
103
931.5625
44
930.0875
104
931.5875
45
930.1125
105
931.6125
46
930.1375
106
931.6375
47
930.1625
107
931.6625
48
930.1875
108
931.6875
49
930.2125
109
931.7125
50
930.2375
110
931.7375
51
930.2625
111
931.7625
52
930.2875
112
931.7875
53
930.3125
113
931.8125
54
930.3375
114
931.8375
55
930.3625
115
931.8625
56
930.3875
116
931.8875
57
930.4125
117
931.9125
58
930.4375
118
931.9375
59
930.4625
119
931.9625
60
930.4875
120
931.9875
0 dBm = 0.775 V
Carrier Frequency of each channel
(Frequency intervals are 25 kHz at each channel)
Adjustment Preparations
Procedure:
1. Set the receive frequency to 930.4875 MHz by ROM writer.
2. Remove the rear cabinet.
3. Short the lands of BP (TSET1) and BP (TEST2) on the SIG-
NAL board.
4. Set a dry battery (size "AA").
Note: After adjustments, open the lands of BP (TSET1) and BP (TEST2)
Shorting Location: SIGNAL board (See page 4)
PD Voltage Adjustment
Setting:
Procedure:
1. Connect the digital voltmeter to TP (PD) on the SIGNAL board.
2. Press the
[POWER/ESC] button (SW1) to turn the power ON.
3. Adjust CT351 so that the voltage becomes 1.5 V.
Specified Values: 1.45 to 1.55 V
Adjustment Location: SIGNAL board (See page 4)
digital voltmeter
SIGNAL board
TP (PD)
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4
Local Frequency Adjustment
Setting:
Procedure:
1. Press the
[POWER/ESC] button (SW1) to turn the power ON.
2. Adjust CT391 so that the peak of waveform on the spectrum
analyzer becomes center of screen.
Specified Values:
Peak of waveform is ± 500 Hz at center frequency.
Adjustment Location: SIGNAL board
Center frequency : 909.0875 MHz
Span
: 10 kHz
RBW, VBW, SWP: AUTO
Reference level
: 50 dBm
spectrum analyzer
loop antenna
· How to make the loop antenna
Wind the lead wire several
times to form a loop as shown.
X
D
ATTEN 0 dB
RL - 50.0 dBm
10 dB/
Center : 909.0875 MHz
RBW :1000 Hz
SPAN
10 kHz
SWP
2.0 sec
Antenna Adjustment
Setting:
Procedure:
1. Connect the audio analyzer or level meter to TP (RSSI) on the
SIGNAL board.
2. Press the
[POWER/ESC] button (SW1) to turn the power ON.
3. Adjust CT301 for a maximum on the audio analyzer or level
meter.
Adjustment Location:
FM RF SSG
Carrier frequency:
930.4875 MHz
Frequency deviation: 6.5 kHz
Modulation frequency: 1 kHz
Output level: 30 dB
µV
15 cm
set
loop
antenna
SIGNAL BOARD (Side B)
BP
(TEST1)
BP
(TEST2)
CT301
Antenna Adjustment
TP (RF-IN)
TP (PD)
CT351
PD Voltage Adjustment
CT391
Local Frequency Adjustment
TP (RSSI)
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MP-7001SC/
7001SM/
7001SP
/7001SS/
7001ST
5
6
7
3-1.
BLOCK
DIA
GRAM
SECTION
3
DIA
GRAMS
2nd
MIX,
IF
AMP,
DET
IC301
DECODER
IC5
PLL
FREQUENCY
SYNTHESIZER
IC302
EEPROM
IC6
MELODY
GENERATOR
IC7
JOG
DIAL
ASIC
IC4
SYSTEM
CONTROLLER
IC1
S-RAM
IC3
LIQUID
CRYSTAL
DISPLAY
MODULE
LCD1
05
·SIGNAL
PATH
:RX
SP1
(BUZZER)
MTO
SI
SC
ST
CLK
D2
PLL
FREQUENCY
SYNTHESIZER
(IC302)
B+
LOCAL
OSC
CIRCUIT
B+
3V
BA
TT
B+
D0
D2
OSC1
SW101
(JOG
DIAL)
XIN
DO
LD
FIN
S2
EXTSI
MISO
EXTSO
BA
TT
B+
RF
CIRCUIT
B+
MIX
IN
MIX
OUT
D301
AGC
Q303
ANTENNA
929.0125MHz
to
931.9875MHz
RX
FREQUENCY
:
929.0125MHz
to
931.9875MHz
21.4MHz
CF301
450kHz
CF302
450kHz
MELODY-SI
MELODY-SC
MELODY-ST
VDET(0.7V)
VDET(1.1V)
RESET
REQ
JOGA
JOGB
XTAL
EXTAL
FILSEL
CHARGE1
QUAD
OSC
IN
16
6
4
BUZZ
ESCAPE
20
3
XIN
13
XOUT
11
5
2
3
4
10
17
19
72
78
77
18
1
2
DATA
3
CLK
2
LE
SYN-DATA
SYN-CLK
SYN-LE
4
90
SYN-UNLOCK
25
89
91
3
4
EEP-DI
EEP-DO
EEP-SCK
2
33
34
35
1
7
36
26
15
PS
6
XOUT
14
8
7
5
93
5
6
16
CHARGE2
15
12
RSSI
13
17
8
REG
OUT
22
REG
CONT
21
1
24
3
RF
AMP
Q301,
302
CT301
ANTENNA
B.P
.F
.
FL301
1st
MIX
Q304
LOCAL
OSC
Q351
LOW
-P
ASS
FIL
TER
ROT
AR
Y
ENCODER
MUL
TIVIBRA
TOR
IC304
LCD
CONTRAST
SWITCHING
Q9
BUFFER
Q352,
371
BUFFER
Q10
BUZZER
DRIVE
Q5,
6
B.P
.F
.
FL302
REGULA
TOR
Q331
2nd
MIX
IF
IN
FSK
OUT1
BS
5
19
FSK
OUT2
18
21
11
DEC-SI
98
DEC-SO
99
DEC-SCK
RSSI
100
DEC-SS
87
DEC-RESET
88
CE1
30
1MSRAM-CS
46
R/W
5
SRAM/LCD-WR
44
OE
32
RD
34
RS
36
WR
35
SRAM/LCD-RD
42
LCD-RS
23
CS
37
LCD-CS
22
RES
38
JOG/LCD-RESET
21
VCI
23
LCD
CONT
2
ELECTRO
LUMINESCENT
LIGHT
DRIVE
IC8,
Q7,
8
LIGHT
24
VIBRATOR
MOTOR
DRIVE
Q1
DC/DC
CONVERTER
IC10
RESET
SIGNAL
GENERATOR
IC11
VOLTAGE
DETECT
IC9
VOLTAGE
DETECT
Q2
REGULATOR
IC303
B+
SWITCH
Q372
1
DEC-INT
73
31
MOSI
30
SCK
28
READY
26
SS
27
RESET
24
RESET
5
RD
15
CSLCD
16
A1
17
12
S1
22
S0
23
IF
AMP
RSSI
QUADRA-
TURE
DET
LOW
-P
ASS
FIL
TER
COMP
ARA
TOR
CHARGE/
DISCHARGE
REGULA
TOR
LOCAL
OSC
CHARGE
PUMP
LOCK
DET
PHASE
COMP
ARA
TOR
OSC
CIRCUIT
PROGRAMMABLE
DIVIDER/COUNTER
SHIFT
REGISTER
&
LA
TCH
PRESCALER
CT351
PD
VOL
TAGE
LOCAL
FREQUENCY
X331
20.95MHz
X391
12.8MHz
X3
76.8kHz
X1
4.91MHz
XCIN
8
XCOUT
9
X2
32.768kHz
11
13
A0
A16
DATA
BUS
A0
A16
70
63,61,
59
52
21
23,25
29
D0
D7
D0
D7
DB0
DB7
86
79
33
26
JOG-D0
JOG-D2
74
76
JOG-INT
18
JOG-PUSH
JOG-RD
JOG-CS
8
20
13,3,
2,31,
1,
12,4,
11,7,
10
EL1
ELECTRO
LUMI-
NESCENT
LIGHT
M1
(VIBRATOR)
EEP-RDY/BUSY
EEP-CS
DI
DO
SK
RDY/BUSY
CS
M
VIBRA
TOR
DRY
BATTERY
SIZE
"AA"
(IEC
DESIGNATION
R6)
1PCS.
1.5V
1
SW1
POWER/ESC
CT391
·
W
a
vef
orms
SIGNAL
Boar
d
1
Q351
Emitter
100
mV/DIV
,10
ns/DIV
2
IC302
qf
XOUT
500
mV/DIV
,50
ns/DIV
3
IC301
2
OSC
OUT
100
mV/DIV
,50
ns/DIV
340
mVp-p
13.2
ns
1.1
Vp-p
78.1
ns
256
mVp-p
47.7
ns
MICR
OCOMPUTER
Boar
d
4
IC4
8
OSC1
1
V/DIV
,20
µs/DIV
2.8
Vp-p
30.5
µ
s
5
IC1
8
XCIN
1
V/DIV
,20
µs/DIV
6
IC1
qd
XIN
(T
ur
ning
the
po
w
er
on)
1
V/DIV
,200
ns/DIV
7
IC5
6
EXT
AL
500
mV/DIV
,10
µs/DIV
8
IC7
1
CLK
1
V/DIV
,20
µs/DIV
9
IC10
3
LX
1
V/DIV
,5
µs/DIV
2.6
Vp-p
30.5
µ
s
3.2
Vp-p
204
ns
1.5
Vp-p
13.1
µ
s
2.8
Vp-p
30.5
µ
s
3.7
Vp-p
1.8
µ
s