Flash Rom : At29C020-90Ti (Control Unit Ic519); Power Amplifier : M68702H (Final Unit Ic1) Tk-790/(B) K Type; Final Amplifier : 2Sc2782 (Final Unit Q6, Q7) Tk-790H(B) - Kenwood TK-790 Service Manual

Flash ROM : AT29C020-90TI (Control Unit IC519)

• Terminal description
Pin Name
A0~A17 Addresses
CE Chip enable
OE Output enable
WE Write enable
I/O0~I/O7 Data inputs/outputs
NC No connect

Power Amplifier : M68702H (Final Unit IC1) TK-790/(B) K type

: M68702L (Final Unit IC1) TK-790(B) K2 type
• Equivalent circuit
2
1

Final Amplifier : 2SC2782 (Final Unit Q6, Q7) TK-790H(B)

• Absolute maximum ratings
Symbol Parameter
V Collector-base voltage
CBO
V Emitter-base voltage
EBO
V Collector-emitter voltage
CEO
Ic Collector current
Pc Collector dissipation
Tj Junction temperature
Tstg Storage temperature
SEMICONDUCTOR DATA
Function
3
F.B.
Tc= 25°C unless otherwise noted
Conditiona Rating
36V
4V
∞
R = 16V
BE
20A
220W
175°C
–65 to 175°C
TK-790/
• Block diagram
Vcc
GND
OE
OE, CE, AND WE
WE
LOGIC
CE
Y DECODER
Address
input
X DECODER
5
4
1 : Input
2 : 1st stage power supply
3 : Final stage power supply
4 : Output
5 : Fin (Earth)
( B ) /H ( B
Data inputs/outputs
I/O0~I/O7
DATA LATCH
INPUT/OUTPUT
BUFFERS
Y-GATING
OPTIONAL BOOT
BLOCK (8K BYTES)
MAIN MEMORY
(240K BYTES)
OPTIONAL BOOT
BLOCK (8K BYTES)
35
)