VC3500/VC3700 Troubleshooting Manual
Valco Cincinnati
Page 9
CPU (Central Processing Unit) board - 151xx362
(Reference Schematic 999xD151-198)
Service Access Points
Connectors
J1, J2
Connection for the optional RS232 daughter board.
J3
Connection to LCD/Touchscreen module via a 20 pin ribbon cable.
J4
Connection to Glue Inspection board (VC3700 only).
J5, J6
Connection for the optional Channel 3 & 4 Logic daughter board.
J7 (not used)
In early models, connection to LED board to deliver analog pressure
feedback signal to CPU.
J8
Connection to Interface board via a 26 pin ribbon cable.
J9
Connection for 17 VDC supply voltage from the Power Supply board.
Indicators
D1 (Reset)
When lit, this red LED indicates that the main processor (68000) is
being given a hardware reset.
Jumpers
2/4 Channel Select A wire jumper near the center of the board determines whether two-
channel or four-channel software is utilized.
Installed: A jumper installed dictates that two-channel software is used.
Not Installed : No jumper dictates that four-channel software is used.
Switches
A pushbutton near the upper left corner provides a manual reset function.
Test Points
TP1 (CLOCK)
8 MHz, 5 V digital clock signal from Oscillator U7 for Main Processor
U1.
TP2 (CNTR-CLK) 5 V Encoder signal gated by a timer from U17 (68230, PB6). These
gated encoder pulses are counted by U9 (74HCT293). Periodically, the
68000 main processor queries this binary count through port lines PA0
through PA7 of U17. The 68000 main processor then calculates line
speed from knowing the number of encoder pulses in a given time
period.
TP3 (MIN SPEED) This signal will be low when the line speed is Greater than minimum
speed. This signal will be high when the line speed is Lower than
minimum speed.
TP4 (PRESSURE) This analog signal (0 to 5 vdc) represents the air pressure sensed by the
EPC-6.
TP5 (+5V)
Small pad located near lower right corner of board.
TP6 (GND)
A U-shaped pad on the right edge provides the reference for all logic
signals.
Summary of Contents for VC3500
Page 1: ...VC3500 User s Manual Software Version 3 X Manual Number MCO35 Manual Release Date July 1999 ...
Page 19: ...Installation VC3500 User s Manual Valco Cincinnati 16 Figure 8 Internal Connections Diagram ...
Page 88: ...VC3700 User s Manual Software Version 3 X Manual Number MCO34 Manual Release Date July 1999 ...
Page 181: ...VC3500 VC3700 Troubleshooting Manual Manual Number MC048 Release Date May 1999 ...
Page 185: ...VC3500 VC3700 Troubleshooting Manual Valco Cincinnati Page 1 System Level Documents ...