Display Unit (X54-3190-20) : Kch-10; Display Unit (X54-3200-20) : Kch-11 - Kenwood TK-790 Service Manual

TK-790/ ( B

Display Unit (X54-3190-20) : KCH-10

Ref. No. Use/Function
IC1 AVR
IC2 Reset
IC3 EEPROM
IC4 CPU/LCD driver
Q1 9V AVR
Q3 DC switch
Q4 DC switch
Q5 DC switch
Q6 DC switch
Q7 DC switch
Q9 DC switch
Q11 DC switch
Q12,13 TRD switch
Q14,15 DC switch
D1,2 Surge absorption
D5 Voltage reference
D6~11 LCD backlight
D12 BUSY LED
D13 TX LED
D16,17 Surge absorption
D19~21 Surge absorption
D24 DC switch
D25 DC switch
38
) /H ( B )
DESCRIPTION OF COMPONENTS
Operation/Condition
Input : SB Output : 5V
Dimmer "Hi", "Low" : ON
, key lighting : ON
Dimmer "Hi", "Mid" : ON
Dimmer "Hi", "Low" : ON
Dimmer "Hi", "Mid" : ON
"PF1", "PF2", "PF3" key
lighting : ON
"PF4", "PF5" key lighting : ON
On when output port on
Key lighting : ON

Display Unit (X54-3200-20) : KCH-11

Ref. No. Use/Function
IC1 AVR
IC2 Reset
IC3 EEPROM
IC4 CPU
Q1 9V AVR
Q2 DC switch
Q3 DC switch
Q4 DC switch
Q5 DC switch
Q6 DC switch
Q7 DC switch
Q8 DC switch
Q9,10 TRD switch
Q14,15 DC switch
D1,2 Surge absorption
D5 Voltage reference
D6 BUSY LED
D7 TX LED
D11,12 Surge absorption
D14~16 Surge absorption
D18 DC switch
D19 DC switch
Operation/Condition
Input : SB Output : 5V
, key lighting : ON
Dimmer "Hi", "Low" : ON
"MON", "PF6", "PF7" key
lighting : ON
"PF1", "PF2", "PF3" key
lighting : ON
Dimmer "Hi", "Mid" : ON
"SCN", "PF8", "PF9" key
lighting : ON
"PF4", "PF5" key lighting : ON
On when output port on
Key lighting : ON