VC3500/VC3700 Troubleshooting Manual
Valco Cincinnati
Page 12
Channel 3 & 4 Logic board - 151xx363
(Reference Schematic 999xB151-199)
Service Access Points
Connectors
J5, J6
Connection to the CPU board.
Schematic Description
Scanner Lockout Function
U1 (87C51) provides the Scanner Lockout function and Jam Indication for Channels 3 & 4.
Channel Logic Function
U2 (87C51) provides the Channel Logic function for Channel 3. U3 (87C51) provides the
Channel Logic function for Channel 4.
Analog board - 151xx364
(Reference Schematic 999xD151-200)
Service Access Points
Connectors
J1, J2
Connection to the LED board.
Jumpers
JP1
Low Pressure Limit Select
A low air pressure limit may be selected for delivery to glue source.
Normally, this is set to 0%. Other possible selections are 10, 25, and
50% of full pressure.
Potentiometers
P1 (Bar 0-Adj)
Allows adjustment of the pressure bar graph on the LCD/Touchscreen to
a minimal length for zero speed.
P2 (Gain Adj)
Not used. In early models, allowed adjustment to gain of frequency-to-
voltage converter U3. Increasing the gain will increase the analog
voltage at J2, pin 3 (to the EPC) for a given frequency of encoder pulses.
Schematic Description
12v Analog Supply
The 12v supply for analog circuits is derived from the LED board at connector J2, pin 10.
Choke L1 provides current stability.
5v Logic Supply
The 5v supply for logic circuits is derived from the LED board at connector J2, pin 9.
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 ...