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5-4.
NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ω and
1
/
W or less unless otherwise
4
specified.
•
: internal component.
¢
• 2 : nonflammable resistor.
• C : panel designation.
Note:
Note:
The components identi-
Les composants identifiés par
fied by mark ! or dotted
une marque ! sont critiques
line with mark ! are criti-
pour la sécurité.
cal for safety.
Ne les remplacer que par une
Replace only with part
piéce por tant le numéro
number specified.
spécifié.
• U : B+ Line.
• H : adjustment for repair.
• Power voltage is dc 9 V and fed with regulated dc power
supply from external power voltage jack (J1).
• Power voltage is dc 12 V and fed with regulated dc power
supply from modular jack (J3).
• Voltages and waveforms are dc with respect to ground
under no-signal conditions.
no mark : Talk
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
N
: RX
F
: RX (INTERCOM)
O
: TX
f
: TX (INTERCOM)
P
: bell
• Waveforms
– BASE MAIN Board –
– HAND MAIN Board –
1 IC1 2 (LO2 OUT)
1 IC503 5 (LO2 OUT)
3.5 Vp-p
10.24 MHz
2 IC14 5 (XOUT)
2 IC504 2 (XOUT)
5.1 Vp-p
3.579545 MHz
Note on Printed Wiring Board:
• X : parts extracted from the component side.
• Y : parts extracted from the conductor side.
•
W : indicates side identified with part number.
• b : Pattern on the side which is seen. (Carbon pattern)
• b : Pattern from the side which enables seeing.
(The other layers' patterns are not indicated.)
Caution:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
• Indication of transistor.
C
Q
These are omitted.
B
E
3.4 Vp-p
3.583 MHz
2.3 Vp-p
10.24 MHz
– 27 –
• IC Block Diagrams
IC504 MC13110FB (HAND MAIN BOARD)
IC1
MC13110FB (BASE MAIN BOARD)
39
38
37
36
35
34
33
32
31
IF AMP/LIMITER
LO1 IN
40
LO1
RX
VCO
LO1 OUT
41
LPF
SCRAMBLER
SPEAKER
VCAP CTRL
42
AMP
GND AUDIO
43
44
SA OUT
ACL
SPEAKER
MUTE
COMPRESSOR
SA IN
45
VOLUME
CONTROL
LIMITER
LPF
E OUT
46
EXPANDER
SCRAMBLER
E CAP
47
E IN
48
14BIT RX
14BIT TX
SCR OUT
49
COUNTER
COUNTER
50
REF 2
TX PHASE
RX PHASE
REF 1
51
DETECTOR
DETECTOR
LO2 OSC
VB
52
1
2
3
4
5
6
7
8
IC11
MC34018P (BASE MAIN BOARD)
28
27
26
25
24
ATT
CONTROL
RECEIVE
ATT
TRANSMIT-RECEIVE
COMPRESSOR
TRANSMIT DET
TRANSMIT
COMPRESSOR
VCC
LOG AMP
TRANSMIT
VB
RECEIVE
ATT
LOG AMP
–
+
MIC AMP
1
2
3
4
5
6 7
8
9
SPP-205/206
28
27
30
29
DETECTOR
RSSI
26
RSSI
25
DET OUT
AALPF
24
RX AUDIO IN
23
VCC AUDIO
CARRIER
DETECT
MIC
22
DA IN
AMP
21
TX IN
20
AMP OUT
19
C IN
18
C CAP
TX
17
TX OUT
DATA
VB
–
AMP
16
BD2 OUT
Ref 2
+
LOW
BATTERY
15
DA OUT
VB
–
DETECT
Ref 1
14
BD1 OUT
+
SERIAL
INTERFACE
9
10
11
12
13
23
22
21
20
19
18
17
16
15
VB
VCC
REG
REG
VCC
PEAK
LIMITER
VB
VTH
VB
+
+
SP AMP
+
–
–
+
–
–
10
11
12
13
14
– 28 –
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