Display Unit - Kenwood TS-990S Service Manual

Ref. No. Use/Function
IC655 OP amplifi er
IC656 OP amplifi er
IC657 OP amplifi er
IC658 D/A converter
IC659 OP amplifi er
IC660 OP amplifi er
IC661 OP amplifi er
IC662 OP amplifi er
IC663 OP amplifi er
OP amplifi er with
IC664
electronic volume
OP amplifi er with
IC665
electronic volume
IC666 OP amplifi er
IC667 OP amplifi er
IC668 OP amplifi er
IC669 OP amplifi er
IC670 OP amplifi er
IC671 OP amplifi er
IC672 OP amplifi er
IC673 OP amplifi er
IC674 OP amplifi er
IC675 OP amplifi er
IC678 OP amplifi er
IC679 OP amplifi er
IC681 OP amplifi er
IC682 OP amplifi er
IC683 OP amplifi er
IC684 Analog switch
IC685 OP amplifi er
IC686 Analog switch
Q50 Switching
Q51,52 Active fi lter
Q53~58 Switching
Q100 Switching
Q101 Switching
Q652,653 Switching
Q654,655 Switching
D1 Switching
COMPONENTS DESCRIPTION
Operation/Condition/Compatibility
Active fi lter for SRECI signal
Active fi lter for SSCPI signal
Active fi lter for SANO signal
D/A converter for electronic vol-
ume IC control
Active fi lter for MANO signal
Active fi lter for SP1 signal
Active fi lter for SP2 signal
Buffer for SAGCV signal and
reference voltage of OP amplifi er
Active fi lter for MRECI signal
Electronic volume for MIXSP1
and MIXSP2 signal
Electronic volume for SP1 and
SP2 signal
Active fi lter for MIC signal
Active fi lter for MRIF/MFMD sig-
nal
Active fi lter for TIF/FMOD signal
Active fi lter for MSCPI signal
Active fi lter for SRIF/SFMD signal
Active fi lter for SP1 and SP2
signal (phone line)
Active fi lter for ANI/UANI signal
Additional curcuit for SP1/BEEP/
MIXSP2 and SP2/BEEP/MIXSP1
signal
Active fi lter for MIC signal
Active fi lter for MRIF/MFMD sig-
nal
Active fi lter for SRIF/SFMD signal
Active fi lter for TIF/FMOD signal
Buffer for MAGCV signal and
reference voltage of OP amplifi er
Active fi lter for ANI/UANI signal
Amplifi er for MIC signal
Select signal (ANI or UANI) for
ADC input
Active fi lter for ANI signal
Select output line (TIF or FMOD)
Audio mute ON/OFF
AF power AMP power supply
Audio mute
3.3V switch
Q100 Control
IC684 Control
IC686 Control
Catch diode for 1.2V swtching
regulator
Ref. No. Use/Function
D50~52 Surge absorption
Reverse current
D100
prevention
Reverse current
D656
prevention
DISPLAY UNIT (X54-3850-00)
Ref. No. Use/Function
IC5 3.3V AVR
IC6 MCU
IC7 Shift register
Analog multiplex-
IC9~11
er
IC12 Bus buffer
IC301 AND gate
IC302 7.83V AVR
IC303~305 AND gate
LCD backlight
IC306,307
driver
Q1 Driver
Q2 Driver
Q4 Switching
Q7,10,
Driver
12,14
Q16~24 Driver
Q26,27,
Driver
29
Q31~47 Driver
Q48 Driver
Q49 Driver
Q50 Driver
Q51 Driver
Q52 Driver
Q53 Driver
Q54 Driver
Q55 Driver
Q301,302 Switching
TS-990S
Operation/Condition/Compatibility
Relay circuit
BKC signal line
For 5V (to X46-399)
Operation/Condition/Compatibility
Power supply for 3.3V (digital
circuit)
Panel microcomputer
Conversion "Serial" and "parallel"
Selector for A/D port of panel
MCU
Extension output for PRST signal
Display backlight controller IC for
IC306,IC307 control
Power supply for 7.83V (main dis-
play)
Display backlight controller IC for
IC306,IC307 control
Display backlight dimmer control
LED control for X42-343 G/10
PCB LED
LED dimmer control
13.8V power supply switch
LED control for X54-385 A/6 PCB
LED
LED control for X54-385 A/6 PCB
LED
LED control for X54-385 A/6 PCB
LED
LED control for X54-385 A/6 PCB
LED
LED control for X42-343 F/10
PCB LED
LED control for X54-385 C/6 PCB
LED
LED control for X42-343 F/10
PCB LED
LED control for X54-385 C/6 PCB
LED
LED control for X42-343 F/10
PCB LED
LED control for X54-385 C/6 PCB
LED
LED control for X42-343 F/10
PCB LED
LED control for X54-385 C/6 PCB
LED
Power supply switch for display
51