Kenwood R-2000 Service Manual page 10

R-2000
CIRCUIT DESCRIPTION
Item Symbol Rating Unit
TO 40 Vee
XTAL
1
2 39
T1
Operating voltage Vee Vss-0.3.~+10
v
XTAL 2 3 38 P27
RESET
4 37 P26
Input voltage Vi
Vss-0.3 ~ Vee+0.3
v
ss
5 36 P25
INT
6
35 P24
Output voltage Vo
Vss-0.3 ~ Vee+0.3
v EA
7 34 P17
RB
e
33
P16
Operating temperature Topt
-40~+85
·c
Storage temp-erature
Tstg -65
~
+150
·c
PSEN 9 32
P15
WR 10 31
P14
ALE 11
µPD80C49C
30
P13
OBo 12 -022
29 P12
081 13
28
Ptt
Table 9. µPD80C49C-022 Max. Rating
082
14
27 PIO
083
15
26
voo
084 16
25 PROG
OBll
17
24 P23
094
18
23 P22
087 19
22
P21
Vu 20 21 P20
Fig. 12. µPD80C49C-022 Terminal name
µPDSOC49C'-022 TERMINAL FUNCTIONS
Terminal
Name Function Input Output
No.
Terminal
Name
Function
Input Output
No.
1 TO Power ON/OFF DAT A input
0
2 XO Microcomputer CLOCK (5.74MHz) input 0
3 X1
4 AST RESET input, Normally:H
0
5
SS Normally5V
21 P20
1110
EXPANDER control output
0
22 P21 0
23 P22 0
24
P23 0
25 PRG 0
6
INT Clock signal ( 1 KHz) input
0 26
voo
STBY control input 0
7
EA
NormallyGND 27 P10 0
8
) Not used, Normally:open
9
10
11
28 P11 0
29 P12 0
30 P13 DATA input 0
31 P14
0
12 BO
AM
I
0
13 81 USB
0
14 82 LSB Mode output
0
15 83
cw
0
16 84 FM 0
32 P15 0
33 P16
0
34 P17 Program SCAN stop input
0
35 P24
1/0
EXPANDER SELECT (L:EX(O), H:EX(1 ))
36 P25 TIMER OUT output
0
17
85 VCO-L
} Output
0
18 86 VCO-M
0
19
87 VCO-H 0
20 GND GND
37 P26 Encoder UP/DOWN input (H:UP, L:Down) 0
38 P27 VHF signal output (VHF:H)
0
39 T1 Encoder & program SCAN clock pulse input 0
40
Vee
Microcomputer 5V & Back up power supply
1/0 EXPANDER
(0)
IC13: µPD82C43C 1/0 EXPANDER
{1)
IC14: µPD82C43C
Terminal
Name Function
No.
Terminal
Name Function
No.
2 P40
) aP.F. Data (BCD)
3 P41
4 P42
5
P43
2 P40 Display DIGIT output 1 OOHZ
3 P41 Display DIGIT output 1 K
4 P42 Display DIGIT output 1 OK
5 P43 Display DIGIT output 1 OOK
1 P50
23 P51
) PLL dMding ratio data, address
22
P52
21 P53
output & DAT A SELECTOR output
1
P50 Display DIGIT output 1 M
Active "L"
23 P51 Display DIGIT output 1 OM
22
P52 Display DIGIT output 1 QOM
21 P53 Display DIGIT output CH
20 P60
PLL IC5 }
19 P61
PLL IC
2
Latch clock output
20 P60 Display SEGMENT output a
19 P61 Display SEGMENT output b
18 P62 Beep output 18 P62 Display SEGMENT output c
17
P63
TIMER error
I
13 P70 M.SCAN
14 P71 PG. SCAN LED output
15 P72 HOLD
16 P73 AUTO.M
17
P63
Display SEGMENT output d
Active "L"
13 P70 Display SEGMENT output e
14 P71 Display SEGMENT output
f
15 P72 Display SEGMENT output g
16 P73
Display SEGMENT output point
10