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1. Display Unit
The optional display unit (front panel unit) for the TK-
5710(B)/5710H(B) comes in two models : KCH-14 and KCH-
15
1-1. KCH-14
This display unit consists of the CPU (IC3), 5V AVR (IC1)
and other components.
• Encoder
Channels are changed by the rotary encoder (ENC). The
up/down pulses from the rotary encoder enter the CPU
(IC3), and converted to a serial data signal, and are sent to
the control unit.
• Power supply
Power is supplied to the CPU by converting SB from the
control unit to 5V by IC1. And SB is supplied to the LED for
backlight.
LCD ASSY
Containing
LCD driver IC
ED1
SB
SW
DM1 DM2
KEY BACK LAMP
CIRCUIT DESCRIPTION
PTT
IC3
HK
30302M84Z2GP
Microprocessor
D8
RX
D9
TX
SW
REF
SW
SW
SW
SW
SW
SW
DM1 DM2
DM1 DM2
LCD BACK LAMP
Fig. 1 KCH-14 block diagram
• CPU
The on/off signals of keys other than the power switch,
and the PTT and HOOK signals, are converted to serial data
and sent to the control unit. Data is displayed on the 12-digit
and 3-digit dot matrix alphanumeric display.
• LCD brightness function
From the control of the CPU's DM1/DM2 port, you can
switch the LCD/KEY backlight or the optional KMC-28 key
backlight as shown in the following table.
LCD
brightness
setting
H
M
L
OFF
5V
AVR
IC1
TA7805F
S8
S9
S10
PF1
PF2
PF3
AF VR
S2
S3
ENCODER
KCH-14/15
LCD
KEY
H
ON
M
ON
L
ON
OFF
OFF
SB
S1
POWER
PS
RESET
S14
S15
PF4
PF5
MIC
1/2
TRD
IRS
INT SP
KMC-28
ON
ON
ON
OFF
5
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