C2Dx T/PUMP TP700 - Service; Protecting Against Electrostatic Discharge (ESD); Water Temperature Control; Fluid System

Protecting against Electrostatic Discharge (ESD)
CAUTION
• Always use ESD protective equipment before opening antistatic bags and servicing electronic parts.
• Do not place unprotected circuit boards on the oor.
Note:
Always ship back circuit boards to C2Dx
®
in the same antistatic bags that the new boards were originally
shipped in.
The electronic circuits in the product are completely protected from static electricity damage when factory
assembled. Always use adequate static protection when servicing the electronic systems of the product. All
service personnel must use static protection whenever they are touching wires.
Sample antistatic protection equipment includes:
• 1 antistatic wrist strap
• 1 grounding plug
• 1 test lead with a banana plug on one end and an alligator clip on the other end
Make sure that you follow the ESD manufacturer’s instructions for appropriate protection against static discharge.
Water temperature control
There are three devices that control the operation of the T/Pump
®
Temperature Therapy Pump heater:
• The temperature is thermistor controlled (Theory of operation on page 25 item 8). This temperature is selectable from
the operator’s keypad (Theory of operation on page 25 item 10). To prevent unauthorized temperature setting changes, a
lockout key is available on the TP700 / TP700C “Professional” model.
• The limit thermostat (Theory of operation on page 25 item 2) is on the brass manifold block (Theory of operation on page
25 item 6). This thermostat senses water temperature owing to the pad. If the water temperature exceeds specic limits
(120º F), the thermostat will shut off the heater. The purpose of the limit thermostat is to prevent the pump from providing
water at too high a temperature to the pad.
• The control of the selected temperature is performed by a dual thermistor (Theory of operation on page 25 item 1) Dual
Processor design. The Control Processor reads its thermistor and determines if heat is positive. If the reading is positive
for heat, the Control Processor sends a signal to an Over Temperature Processor. The Over Temperature Processor reads
the thermistor. This is to make sure that the temperature is below the over temperature value, before it allows the heater
(Theory of operation on page 25 item 5) to turn on.
Fluid system
The pump is a sump conguration. It is magnetically coupled to an impedance protected, shaded pole AC Motor (Figure
5 on page 25 item 3).
The machine return hose tting (Figure 5 on page 25 item 7) is internal to act as an opening. This maintains a back
pressure in the pad to make it resistant to ow restrictions.
101176 Rev 1
Service
24 c2dx.com