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OM-203 185 Page 55
8-3. Diagnostic Procedures For IH/TS
A. Parameter Display Does Not Operate, But 2408 Temperature Controller And 5100V Recorder Displays Do
Operate.
Turn on power source.
Remove 14-pin control cable from power source and IH/TS.
Check for bent pins in 14-pin control cable and on IH/TS receptacle.
Check for +24 volts dc between pins A and D at power source receptacle.
If +24 volts dc is not present, consult power source Owner’s Manual for troubleshooting.
Connect 14-pin control cable to power source.
Check for +24 volts dc between pins A and D at IH/TS end of cable.
If +24 volts dc is not present, replace 14-pin control cable.
Connect 14-pin control cable to IH/TS.
Unplug IH/TS 115 volts ac power cord.
Remove IH/TS wrapper.
Check that plug PLG3 is fully inserted into receptacle RC3 on circuit board PC1.
Check for loose wires in 14-pin receptacle and plug PLG3.
Check for +24 volts dc between pins 7 (−) and 15 (+) at plug PLG3 and receptacle RC3.
If +24 volts dc is not present, check wiring from plug PLG3 to receptacle RC10.
Check that display ribbon cable is fully connected to receptacle RC1 on circuit board PC1 (grey foil on pin 1).
Check solder joints of ribbon cable to display.
Disconnect ribbon cable from display at receptacle RC1.
Check for +5 volts dc between pins 1 (−) and 2 (+) at receptacle RC1, and proceed as follows:
If +5 volts dc is present, replace the display; if 5 volts dc is not present, replace circuit board PC1.
Reconnect IH/TS 115 volts ac power cord.
B. 2408 Temperature Controller Display Does Not Operate, But 5100V Recorder Display Does Operate
Remove and reseat 2408 controller module, make sure that locking tabs are in place.
Remove IH/TS wrapper.
Check for 115 volts ac between L and N at terminal strip on rear of controller module.
If 115 volts ac is present, replace 2408 Temperature Controller; if 115 volts ac is not present, check wiring.
C. 5100V Recorder Does Not Turn On, But 2408 Temperature Controller Does Turn On
Place IH/TS power switch in the Off position.
Open floppy drive door.
Place IH/TS power switch in the On position.
Check for floppy drive light illumination.
If drive light does not illuminate, proceed as follows:
Remove IH/TS wrapper.