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

Part-3

27	Membrane sheet SW defective. Causes other than 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.
28	Membrane sheet switch defective. Sub PCb connector: CN-1 defective. Sub PCB defective. LCD defective.	The switch id defective if: No-4 and No-8 pins of sub PCB connector (CN-1) does not short circuit when setting change-over SW is pressed.  Or  short-circuit status exists before pressing the SW. Check connector. If not withstanding sheet SW normalcy signal does not generate on NO-1-22 pins and 69-80 pins of sub CPU, the sun CPU is defective. Display is un available or un reliable.	Replace the panel part. Check connector function (*9) Replace sub PCB. Replace sub PCB.
31	1. maximum discharge pressure adjusting mechanism defective.	1. If delivery limit on test is less than 98ml or more than 103ml, adjustment is improper.	1. Re-adjust pressure.  Compensate delivery rate.  (replace seal packing, if degenerate)
33	1         connector (CN-8),external connection connector defective. 2         Cable defective. 3         External alarm relay output circuit defective. 4         External alarm relay defective. 5         Main CPU defective.	check connector. Check cable. If No-8 pin of relay (RL-2) does not take “L” level, the circuit id defective. If, not withstanding No-8 pin of relay (RL-20 TAKING “L” level, short circuit between No-3 and No-4 pins of CN-8 does not take place, the relay is defective. If No-61 pin of main CPU does not output “H” level, the main CPU is defective	check connector function. (*9) Replace cable. Replace main PCB. Replace main PCB. Replace main PCB.
34	Connector [CN-8 external connection connector defective. Cable defective. Defective external alarm one-shot input circuit. Main CPU defective.	Check connector. Check cable. If not withstanding II level of CN-8 NO-7 pin NO-45 pin of CPU does not take “L” level, the circuit is defective. If notwithstanding “L” level of main CPU No-45 pin, relay one-shot is not output, main CPU is defective.	Check connection function. Replace cable. Replace main PCB. Replace amin PCB.
35	Connector CN-8 external connection. Cable defective Defect of external alarm buzzer cancel signal input circuit. Main CPU defective	Check connector. Check cable If, notwithstanding “L” level of CN-8 No-5 pin NO-44 pin of CPU does not take ‘H” level, the circuit is defective. If notwithstanding “H” level of of main CPU No-44 pin, buzzer does not stop, main CPU is defective.	1.Check connector function. Replace cable. Replace main PCB. Replace main PCB.
37	Occulusion pressure adjustment defective.	1.  If occlusion pressure is less than 0.5kg/cm2 or more than 1.0kg/cm2	1.  Adjust occlusion detection pressure.
38	Defect of low battery A/D signal generating circuit. Main CPU decetive.	low battery alarm is not output. Confirm voltate A/D value in the self diagnosis mode.  If low battery alarm is not generated, even when A/D value is less thatn 108, main CPU is defective.	1 Replace main PCB. Replace main PCB.
39	1. Main Cpu defective.	1  Source power shutdown does not take place.  Confirm voltage A/D value in the sef diagnosis mode.  If source power shutdown does not take place even A/D value is les than 101, main CPU is defective.	1.  Replace main PCB.  For the method of changing the mode into self diagnosis and confirming voltage A/D value, refer paragraph 4.2
40	power source connection defective. Other than above	Connect power source twice or thrice times. Refer the paragraph-2	Connect power line tightly. Refer the paragraph 2.
41	Battery defective. Other than above.	Battery LED does not light. Refer to paragraph-2	Replace battery. Refer to paragraph-2
42	Battery defective. Other than above.	Alarm light Refer paragraph -2	Replace battery. Refer paragraph-2.

END. 
Principles of operation to Terumo Infusion Pump Model-508 follows on next blog