Shift Register 2 On Control Unit (Ic517); Shift Register On Tx-Rx (Ic201); Audio Power Amplifier - Kenwood TK-790 Service Manual

TK-790/ ( B

• Shift register 2 on control unit (IC517)

Pin No. Port Name
4 Q1 MM
5 Q2 AS
6 Q3 DS
7 Q4 AM1
14 Q5 RG1
13 Q6 RG2
12 Q7 MS
11 Q8 AM2

• Shift register on TX-RX (IC201)

Pin No. Port Name
4 Q1 STR
5 Q2
6 Q3
7 Q4
14 Q5 8R
13 Q6 W/N
12 Q7
11 Q8

Audio Power Amplifier

: TDA8561Q (Control Unit IC522)
• Terminal description
Pin No. Symbol
1 –INV1
2 GND (S)
3 INV 2
4 RR
5 VP1
6 OUT 1
7 GND1
8 OUT 2
9 NC
10 OUT 3
11 GND2
12 OUT 4
13 VP2
14 MODE
15 INV 3
16 VDIAG
17 –INV 4
34
) /H ( B )
SEMICONDUCTOR DATA
Action
MIC mute H : Mute, L : Unmute
Audio line SW RX BPF← →DE-EMP
DET line SW DET← →RX BPF
Audio mute 1
Modem RG1
Modem RG2
MOD line SW MIC AMP← →RX BPF
Audio mute 2
Action
TX/RX VCO SW
Not used
Not used
Not used
8R SW
Wide/Narrow SW H : Narrow, L : Wide
Not used
Not used
Description
Non-inverting input 1
Signal ground
Inverting input 2
Supply voltage ripple rejection
Supply voltage
Output 1
Power ground 1
Output 2
Not connected
Output 3
Power ground 2
Output 4
Supply voltage
Mode select switch input
Inverting input 3
Diagnostic output
Non-inverting input 4
• Block diagram
1
mute switch
–INV 1
+
60
kΩ
_
VA
2
kΩ
18kΩ
mute switch
+
60
kΩ
_
3
INV 2
VA
2
kΩ
18kΩ
V
P
stand-by
switch
VA
15kΩ
×1
4
RR
15kΩ
17
mute switch
–INV 4
+
60
kΩ
_
VA
2
kΩ
18kΩ
mute switch
+
60
kΩ
_
15
INV 3
VA
2
kΩ
+
18kΩ
input
reference
voltage
2 9
GND (S) NC
V V
P1 P2
5 13
Cm
6
power stage
Cm
8
power stage
14
+
_
stand-by
+
reference
voltage
PROTECTIONS
thermal
short-circuit
mute
switch
+
16
+
_
+
mute
reference
voltage
Cm
12
power stage
Cm
10
power stage
11
7
GND1 GND2
OUT1
OUT2
MODE
V
DIAG
OUT 4
OUT 3