Reichert AT550 Service Manual

13900-103 Rev. A Page 19
Figure TT-4, Power Input / Output Block Diagram
U?A 74HC08
1 2
3
BRIDGE
-+
BUZZER
BRIDGE
-+
TXA RXA TXB RXB
KEY_PAD_CE IO_CE3 AXIS_MOT_CE FUTURE_OUT_CE
IO_ENABLE
AXIS_MOT_CE
PRINTER_CE STATUS_PORT_CE
MOTOR_STATUS
VEE_DISABLE
YDIS
CONTRAST ADJ LCD_VEE_OUT
LCD_DISP_CE PCF8584_CS
RESET_IN
I2C_INT_OUT
I2C_INT_OUT
PRINTER_STROBEBUZZER
RESET_IN
R/W A1
/INTR_TRI_EN
+5VVMM+18V
+5V VMM
VMM
+18 V -18 V +5V
VMM
+5V+18V-18V
SERIAL PORTS
VOLTAGE
TRANSLATION
SERIAL PORTS
FROM CONTROL BOARD
10-PIN HEADER DB-9 CONNECTOR
PORT A
INSTRUMENT USER
INTERNAL USE(DEBUG)
PORT B
TO MOTOR BOARD
I/O: ADDR/DATA/CONTROL
A1-8 D0-7
CONTROL
X,Y,Z MOTOR STOPS
<
I/O DECODES
en
A3-5
D0-7 D0-7
>
<
KEYPAD
KEYPAD DATA
D0-7
KP_DATA 1-5
PRINTER STATUS
PRINT DATA
PRINTER PORT
MOTOR BD. POWER
X,Y,Z MOTOR STOPS
DISPLAY CONNECTOR
D0-7
DISPLAY BACKLIGHT
CLK
DATA(XD0-3)
rst
DISPLAY MEMORY
8MHZ
I2 C
CS
PRINTER POWER
DRIVE
DISPLAY CONTROLLER
INT
CONTROLLER
DISPLAY BACKLIGHT
CS
I2 C BUS
CONTROL
12VAC INPUT
POWER CONTROL
TRANSFORMER
FEEDBACK
ONE SHOT
data/status
I2 C BUS
BUZZER DRIVE
VIDEO BD. POWER
R/W
A0
<
J14
J1
J4
J5
Internal
External
12 V AC INPUT
J2
j13
J3 J8
J10
J12
J6 J11
J7
1
3,4
2
5,6
3
1,2 4,5
1 3 4
5,6
Testing (Continued)

Reichert AT550 Specifications

General

Brand	Reichert
Model	AT550
Category	Measuring Instruments
Language	English