Schematic Diagrams And Component Layouts; Interconnect Schematic; Transceiver-To-Rpi Programming Cable - E.F. Johnson LTR-Net 7243 Service Manual

SECTION 8 SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS
RF BOARD AUDIO/LOGIC BOARD
J101 J1
Battery In 1 Battery Out
Modulation In 2 Modulation Out
Battery In 3 Battery Out
Sw Narrow/Wide In 4 Narrow/Wide Out
NC 5 TMUT
Power Control In 6 Tx Power Out
RSSI Out 7 RSSI In
BPF Shift In 8 BPF Shift Out
Squelch Out 9 Squelch In
NC 10 NC
Lock Detect Out 11 Syn Unlock In
Gnd 12 Gnd
Latch Enable In 13 PLL Strobe Out
Sw Battery In 14 Sw Battery Out
Data In 15 PLL SO
Audio Out 16 Detect In
Clock In 17 PLL SK Out
Mod Balance 18 LTR Out
Delayed PTT In 19 R5C Out
Gnd 20 Gnd
J3
1 Tx In
2 Gnd
3 Tx Out
4 CLR/CODE
5 T5C
6 NC
7 NC
8 NC
9 NC
TO OPTIONAL
ENCRYPTION 10 Sw Bat Out
MODULE
11 Gnd
12 AMUTE In
13 Beep Out
14 AMUTE Out
15 Opt B
16 Ext DC
17 Rx Out
18 PTT In
19 Rx In
20 PTT Out
KEYPAD/DISPLAY BOARD
J2 J801
Sw Battery In 1 Sw Battery Out
Gnd 2 Gnd
Display Strobe Out 3 Display Strobe In
Serial Clk Out 4 Serial Clock In
Display Enable Out 5 Display Enable In
L5V Out 6 L5V In
BK LED Out 7 Bk LED In
Key R0 8 Key R0
Key S0 9 Key S0
RxD 10 RxD
TxD 11 TxD
T5C Out 12 T5C In
Key R1 13 Key R1
Key R2 14 Key R2
Key R3 15 Key R3
Key S1 16 Key S1
Key S2 17 Key S2
Key S3 18 Key S3
NC 19 NC
AMUTE Out 20 AMUTE In
Keypad Int In 21 Keypad Int Out
Audio VRIN Out 22 Audio VRIN In
Reset 23 Reset
Mic Audio In 24 Mic Audio Out
Key S4 25 Key S4
NC 26 NC
MSO 27 MSO
MICE 28 PTT/Flash
Gnd 29 Gnd
Bat Out 30 Bat In
Bat +
+ BT100
7.5 VDC BATTERY
PACK
_
Bat -

INTERCONNECT SCHEMATIC

8-1
J802 J901
Gnd 1
PTT/Flash 2
Int Spkr + 3
Gnd 4
S903
Int Spkr - 5
Aux Sw
Aux Sw 6
Audio VR In 7
R902
10k
Audio VR Out 8
R901
0
Batt 9
Emer Sw 10
S902
FCN Sw
Function Sw 11
TxD 12
RxD 13
Sw Batt In 14
Ext Mic Audio 15
Gnd 16
Reset 17
UDC Sense 18
UDC Mic Sense 19
Ext Spkr 20
1
2
3
4
5
To Transceiver
Accessory Connector
6
7
8
9
10

TRANSCEIVER-TO-RPI PROGRAMMING CABLE

FLEX CIRCUIT
Internal Speaker
J902 +
SPK1
J901
Power Sw
VR901A
C902
C903
0.1
0.1
Vol Ctrl
VR901B
20k
S904
Emer Sw
PTT/Flash
Ext Mic Audio
TxD
RxD
Sw Bat Out
Gnd
UDC Mic Sense
Reset
Ext Spkr Audio Out
UDC Sense
Part No. 597-7200-031
S901
PTT Switch
PTT/Flash
1
Ext Mic Audio
2
TxD
3
RxD
4
Sw Bat Out
ACCESSORY
5
CONNECTOR
Gnd
6
UDC Mic Sense
7
Reset
8
Ext Spkr Audio Out
9
UDC Sense
10
RxD
A
Gnd
1
Mic Audio
2
Hanger
3
To RPI
20V Prog
4
Bat
5
Rx Audio
6
TxD
B
November 2001
Part No. 001-7240-001