Abbott aim Technical & Service Manual page 83

Section 6, Troubleshoating
Table 6-5. Troubleshooting
Symptoms
Possible Source
Troubleshooting (repair as required)
5. Tachometer produces
incorrect RPM or no pulses
U7, U8, U31 or associated
components.
Replace components as necessary.
Motor tachometer. Check both phase1 and phase2 outputs
approx. 90° out of phase. Replace motor
as required.
Connections from board to
motor.
Repair connections as required.
No encoder power. Check U10C or 04.
No encoder strobe. Check for strobe pulse.
6. OCCLUSION or CHECK | Q11 shorted collector to Replace Q11.
CARTRIDGE display does | emitter causing LED drive to
not appear when occlusion | be too high.
is present
Open R60. Replace R60.
Occlusion phototransistor or
wiring.
Repair wiring or replace entire optics
assembly.
AID, or A/D reference. Replace U19.
AIM/AIM Plus Technical Service Manual 6-17 430-600035-002 (Rev. 11/99)