Yaesu FT-208R Maintenance Service Manual page 44

Q3 0 1 CPU HD44820-A07
PIN PORT I/O
D4
TX
2
D5
3 D6 PTT
N.C
4 D 7
DOWN
5 D8
6 D9 UP
7 D l O SCANSTOP I
D l l SCANSTOP I
8
9 D 1 2 KEY-E
D 1 3 STD
1 0
CE
1 1 D 1 4
NC
1 2 D l S
R40
1 3 KEY-A
1 4 R41 KEY-B
R42
1 5 KEY-C
R43 KEY-D
1 6
KEY 1
1 7 R50
LCD4
KEY 2
1 8 R51
LCD3
KEY 3
1 9 R52
LCD2
KEY 4
20 R53
LCDl
RESET
2 1
22 GND
osc 1
23
osc 2
24
25 HLT
26 TEST
vcc
27
28 ROD
29 RO l
30 R02
31 R03
32 R l O ROW 1
ROW 2
33 R l 1
R 1 2 ROW 3
34
R 1 3 ROW 4
35
INTO
36
37 INT l
R20 BZ OFF
38
39 R 2 1 LOCK
R 2 2 X2
40
41 R 2 3
M.S
42 R 3 0 -SET
43 -RPT
R 3 1
44 R32 +RPT
45 R33 +SET
46 COL l
R60
47 R6 1 COL2
48 R6 2 COL3
49 R6 3 COL4
BZ
5 0 D O
5 1 D l CPL
5 2 D 2 CPS
5 3 DI
D 3
54 NC
0
TX "L"
0
TX "H"
PTT Press "L"
GND
Not used (Normally "H")
Not used (Normally "H'')
BUSY STOP STOP "L"
CLEAR STOP STOP "H"
0
KEY (E) ROW OUT (Normally "L") KEY ON
0
LCD DRIVER STROBE Normally "L"
0
LCD DRIVER ENABLE Normally "L"
GND
0
KEY (A) ROW OUT Normally "L"
0
KEY (B) ROW OUT Normally "L"
0
KEY (C) ROW OUT Normally "L"
0
KEY (D) ROW OUT Normally "L"
1/0
KEY -+ IN LCD -+ OUT Normally "H"
1/0
KEY -+ IN LCD -+ OUT Normally "H"
1/0
KEY -+ IN LCD -+ OUT Normally "H"
1/0
KEY IN LCD OUT Normally "H"
POWER ON RESET Normally "L" Pulse width l Om sec
GND
300kHz 2.5Vp-p
400kHz 5Vp-p
POWER ON "H'
vcc
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+5V (Backup +2.3V)
Moad A-E rel«t (Seo ""'"'"°' """ modifi"Hoo.)
I
0
DTMF ROW OUT (A) ROW (TX) "L"
0
DTMF ROW OUT (B) ROW (TX) "L "
0
DTMF ROW OUT (C) ROW (TX) "L"
0
DTMF ROW OUT (D) ROW (TX) "L"
Not used (GND)
Not used (GND)
"L" TX KEY I N ALARM STOP
"L" KEYBOARD LOCK
"L" DOUBLE STEP SCAN
"L" MEMORY SPLIT
"L" -SET SHIFT
"L" -RPT SHIFT
"L" +RPT SHIFT
"L" +SET SHIFT
0
DTMF COLUMN OUT PRESS COLUMN 1 "H" (TX)
0
DTMF COLUMN OUT PRESS COLUMN 2 "H" (TX)
0
DTMF COLUMN OUT PRESS COLUMN 3 "H" (TX)
0
DTMF COLUMN OUT
0
ALARM TONE OUT SkHz signal ( 1 00msec).
0
PLL LATCH PULSE
0
PLL CLOCK PULSE
0
PLL DIVIDE DATA
FUNCTION/WAVE FORM
3-1 3
SERVICING
l mS
1T
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