TROUBLESHOOTING CHART: TERUMO INFUSION PUMP: STC – 508 [MEDICAL ELECTRONICS]

PART-2

10	Sub PCB connector: CN-1 defective. Cable defective. Membrane sheet SW defective. Defective of source power SW disconnection detection circuit. Sub CPU defective.	Err 9 is displayed. Check connector. Check cable. Membrane SW is damaged when No-6 and No-10 pins of CN-1 of PCB are continuously in short circuit. Circuit is defective when: Output from No-42 pin of sub CPU continues on H level, despite membrane SW is normal. Other than the above.	Check connection function. Replace cable. Replace membrane sheet SW. Replace sub PCB. Replace sub PCB.
11	main PCB connector: CN-7 defective. Main PCB defective.	Check connector. Other that the above.	Check connection function. Replace main PCB.
12	Circuit defective of backlight LED, LCD, LED, main/sub CPU, LED drive, etc. Buzzer circuit defective.	Visual check [check if any non-light items] Buzzer does not sound.	Replace the sub PCB. Replace main PCB. [Ref: item No-18]
15	Main pcb connector [CN-4] defective. Cable defective. Door open detection sensor defective. Door open detection circuit defective. Main CPU defective.	Check connector. Check cable. While door is open, if CN-4 8-9P is short circuit; the sensor is defective. While door is open, if L level signal is output fron No-8 pin of IC-12 of door open detection circuit, the circuit is defective. While door is open, if L level signal is output to No-10 pin of CPU (IC-1), main CPU is defective.	Check connector function. Replace cable. Replace door open detection sensor. Replace main PCB. Replace main PCB.
16	Source power judging circuit defective. Transformer defective. Fuse blown [inside main PCB] Main CPU defective. Main PCB connector. Cable defective Sub-CPU defective LED drive circuit defective. LED defective.	If voltage between collector and emitter of transistor [TR-4] is more than 1 volt, the circuit is defective. If 13.8VAC voltage is not measured between No-4 and No-6 pins of CN-9, the transformer is defective. Check fuse [ICP2] and [ICP5] by applying tester bridging 2 ends of each fuse. Cases by other cause. Check connector. Check cable. If No-35 pin of sub CPU does not output II level signal, sub CPU is defective. If No-15 pin of IC [4A] in LED drive circuit of sub PCB does not output L level, the circuit is defective. If voltage between the two end of resistor [R2] is about (0V) or about (12V), the LED is defective.	Replace main PCB. Replace transformer. Replace main PCB. Replace main PCB. Check connector function. Replace cable. Replace sub PCB. Replace sub PCB Replace sub PCB.
17	Sub CPU defective. LCD defective LED drive circuit defective. LED defective	Check if output signal to sub CPU LCD is normal Check the input signal to sub CPU LCD is normal. If No.10 pin of IC (3C) in LED drive circuit of sub PCB does not output “L” level, the circuit is defective. If voltage between the two ends of resistance (R2) is about (0V) or about 12V, the LED is defective.	Replace sub PCB. Replace sub PCB. Replace sub PCB. Replace sub PCB.
18	Main CPU defective Buzzer drive circuit defective Buzzer defective.	If No 20. pin of main CPU does not output “L” level signal, or NO 62P does not output pulse signal, the main CPU is defective. Defective buzzer source power supply.  If about 2.048KHz oscillation is not transmitted from NO-3 pin of IC 13 in buzzer drive circuit of main PCB, the circuit is defective.    If the collector and emitter of transistor TR-6 in the buzzer drive circuit does not repeat )N_OFF between them, in synchronized with pulse signal output from No-62 pin of main CPU, then the circuit is defective.    If No-8 pin of IC-11 in buzzer drive circuit does not output ‘H” level signal, the circuit is defective.    If NO-11 pin of IC-11 in buzzer dirvie circuit does not repeat ON_OFF, synchronized with pulse signal output from No-# pin of IC-13, then the circuit is defective. Cases by other cause	Replace main PCB.  No more repair to this board can be done. Replace main PCB Replace main PCB
27	Membrane sheet SW defective. Causes other thatn above	The switch is defective if: NO-5 and No-7 pins of sub PCB connector (CN-1) does not short circuit when purge switch is pressed, or short circuit status exists before pressing the switch. Various check	Replace panel part. Ref: Item No-5.

To be continued Part-3