Kenwood TM-2550A Service Manual page 13

CIRCUIT DESECRIPTION
TM-2550A/E,2530A
PinNo. | Name |in/Out Function Logic | Pin No. | Name [In/Out Function Logic
1 RDO | Encoder E1 33 P20 is) 1750Hz Tone Controt (T,W) IL
2 RD1 | Encoder E2 34 P21 ie] PLL Enable Signal IL
3 R40 1/0 | Data Bus (DO) 35 P22 O | HD61602 RE Signal LS
4 R41 1/0 | Data Bus (D1) 36 P23 (o) HD61602 WR Signal "LY
5 R42 1/0 | Data Bus (D2) 37 P30 fa) PLL (Tone) Data Output
6 R43 1/0 | Data Bus (D3) 38 P31 (0) Squelch Control Signal TL
7 R50 1/0 | Data Bus (D4) 39 P32 O | Audio Mute Signal a
8 R51 1/O | Data Bus (D5) 40 P33 (0) PLL (Tone) Clock Output
9 R52 1/0 Data Bus (D6) 41 RBO j VOICE SW Input LI
10 R53 HO Data Bus (D7) 42 RB1 ) PHONE (K,M) SW input
14 R60 \ HD61602 READY Signal "LD P.MR (T,W) SW input LI
12 R61 | | SUB CPU Busy Signal IL) 43 RB2 ; MIC Down SW Input LE
13 R62 { Busy Signal 44 RB3 ! MIC Up SW Input LS
14 R63 \ Tone SW Input LP} 45 KOO ! SW Return (S1)
15 R70 | 16 Key Return (K1) 46 KO1 | SW Return ($2)
16 R71 { 16 Key Return (K2) 47 KO2 l SW Return (S3)
17 R72 { 16 Key Return (K3) 48 KO3 ! SW Return (S4)
18 R73 I 16 Key Return (K4) 49 RESET Reset Input LY
19 RAO O __| Memory Lamp SI-L| 50 Xin Clock
20 RA1 ie) RAM OD Signal Output 51 Xout Clock
21 RA2
QO | Standby Signal Output
'LF | 52. | ROLo
Back up Information Input LST
22 RA3 (e) RAM A8 Signal Output 53 R80 I SUB CPU Request Signal IL
23 POd ie) Address Latch
S7k 54
R81 t PTT SW Input
LI
24 PO1 ce) RAM CE Signal Output LA 55 R82 ! DCL Diode Matrix Input
25 PO2 (e) HD61602 CS Signal Qutput LI | 56 R83 \ SCAN Timer Trigger pulse
26 £03 ie) RAM CE2 Signal Output 57 R90 Oo Keyboard select
27 P10 ie) 16 Key Scan (K5) 58 R91 0) Serial Data Output
28 Pil ie] 16 Key Scan (K6) 59 R92 oO Serial Clock Output
29 P12 O__| 16 Key Scan (K7) 60 RCO O LED (DCL) Control LST
30 P13 ie) 16 Key Scan (K8) 61 RC1 io) LED (C.SQ) Control LI
31 TEST GND 62 RC2 Oo SW Scan
32 Vss GND
63
RC3 Oo Tone DATA LOAD Signal
LST
64 VDD Power Supply
Table 7. TMP47C46N-9042 Terminal functions (Control unit 1C2)
Pin No. | Name |tn/Out Function Logic | PinNo. | Name [In/Out Function Logic
:| OOUT Open 21 CL2 Clock
2 P20 oO VS-1 PS4 22 INT1 ! Modem Clock Input
3 P21 (@) "Beeper' Switching 23 POO i] Backup Clock Input
4 P22 (6) MAIN CPU Busy Signal STL 24 PO} ! Serial Clock Input
5 P23 ie) VS-1 SR 25 PO2 Open
6 P10 (e) Adress Latch SIL 26 PO3 | Serial Data Input
7 Pit 27 P6O 1/0 | Modem Data Input/Output
8 P12 i HD61602 READY Signal SILI 28 P61 e) Modem Me Signal Output
9 P13 O | VS-1 BY JL] 2 P62 O | MAIN CPU Request Signal STL
10 P30 ie) VS-1 PSO 30 P63 oO RAM A8 Signal Output
11 P31 (es) VS-1 PS1 31 P50 1/0 | DATA BUS (DO)
12 P32 oO VS-1 PS2 32 P51 1/0 | DATA BUS (D1)
13 P33 [e) VS-1 PS3 33 P52 1/0 | DATA BUS (D2)
14 P70 oO RAM OD Signal Output 34 P53 0 DATA BUS (D3)
15 P71 oO HD61602 €S Signal Output 35 P40 H/o DATA BUS (D4)
16 P72 oO RAM and HD61602 R/W 36 PA1 1/0 DATA BUS (D5)
17 P73 oO RAM CS7 Signal Output 37 P42 1/0 DATA BUS (D6)
18 RESET Reset Input 38 P43 (70 | DATA BUS (D7)
19 cli Clock 39 Vss GND
20 VDD Power Supply 40 EVENT GND
Table 8 uPD7508H-056 Terminal functions (Control unit IC3)
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