CAS LP-2G, Service Manual

Page: 55 / 104

14 Servicing & Parts Replacement
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14.3 Main PCB Replacement
1. Follow all of the directions in section 14.2 first.
2. Unplug the main PCB connectors at:
A. J9, CAL Switch.
B. J10, Peel Sensor.
C. J11, Peel Emitter.
D. J13, Thermal print head.
E. J14, Stepper motor.
F. J15, Gap sensor assembly.
G. J16, Pick-up motor.
H. J17, Display (A).
I. J18, Display (B).
J. J19, Power supply (A).
K. J20, Power supply (B).
L. J21, Load cell data.
M. J22, Load cell power.
3. Remove main post and 5 screws from the main PCB.
4. Slide main PCB upwards so as to clear the
plastic column.
5. Insert new main PCB.
6. Make sure to remove and troubleshoot any
accessories from the old main PCB. These may
include the Memory Expansion PCB or the
Network Memory PCB.
7. After you are sure that these accessories are in
working order, attach them to the new main
PCB.
8. If the new main PCB has no EPROMs, make sure
to use the EPROMs from the old main PCB only
after you have determined that they are in
working order.
9. The main PCB EPROMs are listed below in left-to-right order:
A. U5, Scale System EPROM, 4M bit.
B. U6, Scale Display EPROM, 4M bit.
C. U7, Printer Fonts EPROM, 4M bit .
D. U8, Printer System EPROM, 2M bit.
10. Once EPROMs and accessories are replaced, reassemble scale (reverse order.)
11. Do a Memory All Clear, (see section 8.6)
14.4 Power Supply Replacement
1. Follow all of the directions in section 14.2 first.
2. Unplug the Power Supply connectors at:
A. CN1, Input power source.
B. CN21, Output power (A).
C. CN22, Output power (B).
3. Then, remove the 4 screws holding down the
Power Supply chassis.
4. Install new Power Supply and reassemble in
reverse order.