System Keyboard Model Cspk-5000E; Control Board (Sy-211); Key Matrix Board (Kio-9) - Sony CSP-5000E Service Manual

SYSTEM KEYBOARD MODEL CSPK-5000E

IF-511 BOARD
MIC
(PHONE-JACK)
SPEAKER
(PIN-JACK)
PRINTER
(MINI-JACK)
CABLE COMP
(SLIDE-SWITCH)
VIDEO IN
(BNC)
VIDEO OUT
(BNC)
RESET
(TACT-SWITCH)
RS-422A
(MODULAR-JACK)
POWER
AC IN
SWITCH
SYSTEM KEYBOARD MODEL CSPK-5000E
Structure
System keyboard, model CSPK-5000E consists of the
following:

Control Board (SY-211)

Key Matrix Board (KIO-9)

Connector Board (IF-511)
JOYBALL Section
LCD Module Section (LM40X21B)
5-8
http://getMANUAL.com
SY-211
S/M/L
BUFFER
CABLE
COMPENSATOR
AMP
VIDEO
SYNC DETECTOR
RESET
UART ROM RAM
RS-422
RECEIVER/DRIVER
SWITCHING
REGULATOR
BOARD
CHARACTER
GENERATOR
DATA
CPU
DATA-BUS
ADDRESS-BUS
CONTROL-BUS
+5V
BACKLIGHT
POWER
+5V
LCD
Circuit Description
Control Board (SY-211)
• The board consists of analog and digital signal circuits.
[Analog signal circuit]
• The DC component of video signals from CN102 are
removed by C103 and forwarded to the subsequent cable
compensation circuit, where IC105's gain and
frequency-characteristics are adjusted in three steps, S/
M/L, by the switching signals sent from CN103 and set
according to coaxial cables (type/length) being in use.
After the cable compensation circuit, the video signals
go to the character-generator circuit. In the character-
generator circuit, the on-screen-display IC (IC103) adds
characters to the video signals and sends them to the
IF-511 board through CN102. The micro-computer
(IC101) controls IC103. The sync detector signal
available from IC103's pin #13 is integrated by CR
network that follows and is forwarded to the micro-
computer. The micro-computer then reads the signal and
determines whether the video signal is existent (low
level) or non-existent (high level) and switches the
circuit automatically to the external video signal mode or
the internal video signal mode (with blue background).
KIO-9 BOARD
I/F
KEY
MATRIX
I/F
LED
X
Y
JOYBALL
CSP-5000E
CSPK-5000E