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G128_1701HCA<br />
G128_1701HC<br />
TEMPERATURE CONTROL BOARD<br />
The analog circuitry consists of:<br />
• RESISTANCE TEMPERATURE DETECTOR (RTD), which is a component that varies the<br />
voltage it outputs depending on the temperature to which it is exposed<br />
• INSTRUMENTATION AMPLIFIER<br />
– converts the low level signal from the RTD to a usable level, which is converted to a digital<br />
value by the analog-to-digital CONVERTERS<br />
– the converted digital value can then be read as a temperature by the MICROPROCESSOR<br />
+17<br />
FIX<br />
SSR #6<br />
HEAT<br />
SSR #5<br />
HEAT<br />
BLEACH<br />
SPARE<br />
SSR #7<br />
HEAT<br />
J3<br />
SSR #4<br />
HEAT<br />
MAGENTA<br />
DRYER<br />
SSR #8<br />
HEAT<br />
1<br />
SSR #3<br />
HEAT<br />
YELLOW<br />
SSR LED (10)<br />
SSR #9<br />
SSR #10<br />
HEAT<br />
COOL<br />
BOOST BOOST<br />
SSR #2<br />
HEAT<br />
CYAN<br />
SSR #1<br />
HEAT<br />
1ST DEVELOPER<br />
RED STRIPE<br />
The second BOARD, which is attached to the MAIN BOARD by a RIBBON CABLE, contains drive<br />
circuitry to energize the SOLID STATE RELAYS (SSRs) that control:<br />
• HEATERS<br />
• SUPER HEATER<br />
• SUPER CHILLER<br />
The BOARD can control 10 SSRs, but only 9 SSRs are used. The first 7 SSRs control the HEATERS<br />
for each of the chemical TANKS in the PROCESSOR. The other 2 SSRs control the SUPER HEATER<br />
and SUPER CHILLER.<br />
TG2044-1 – 06APR99 21<br />
J1
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