Abbott aim Technical & Service Manual page 85

Section 6, Troubleshooting
Tabie 6-5. Troubleshooting
Symptoms
Possible Source
Troubleshooting (repair as reguired)
9. AIR-IN-LINE alarm stays
on even when air is not
present in sensing
chamber of cartridge.
[PURGE] key may not have
been pressed to clear alarm.
Press [PURGE] (refer to the System
Operating Manual for instructions).
011 shorted collector to Replace Q11.
emitter causing LED drive to
be too high.
R59 shorted. Replace R59.
Air phototransistor or wiring. Repair wiring or replace optics assembly.
Microprocessor, Replace U19.
10. Timer does not keep
time.
Crystal Y2 or timer chip U20. Replace Y2 or U20 as required.
If time is lost when batteries
are removed, check BT1.
Replace lithium battery if voltage is less
than 2.85V.
11. Beeper inoperative, but
display appears normal.
Audio transducer, Q7,
U26A,U26B, U26C, U10F,
U35A U35B or U11C.
Trace signal from PW3 to J12. Replace
components as reguired.
AIM/AIM Plus Technical Service Manual 6-19 430-600035-002 (Rev. 11/99)