SA-HT730 / SAHT930
7
3. Simulated Failure Symptoms – quick fixes
Although sensor failures cause the following symptoms listed in table 3, the more
common failure is an internally broken ribbon cable that carries the sensor signal to
the microprocessor.
To determine which is at fault, begin testing using figures 4 and 5 or order the cable
with the corresponding sensor. For example the motors (#6 & #7 in table 3) and
S9001 (#4) can be quickly checked with an ohmmeter at the CN2010/2011 cable end
(see figures 4 or 5). If the part tests bad bypass the cable and recheck the part right
at the part’s terminal.
CN2010 ribbon cable p/n = REZ1484 (11 pins)
CN2011 ribbon cable p/n = REZ1483 (10 pins)
Simulated Failures
Sensor Cable
Symptom
Comments
1. Disc Det Q9103
open
CN2010 No disc detected (no PB possible).
2. Tray rotation Q9102
open.
CN2010 Tray motor rotates back & forth for ¼ rotation then
shuts down. H01 error code shown.
Unit shuts
down.
3. Tray position
Q9101 open.
CN2010 Slow continuous CCW rotation of the tray. “INIT”
appears and no buttons work except power.
Unit does not
shutdown.
4. Main gear position
Q9001 open.
CN2011 Tray moves out and spins, then the tray moves in.
and the mech clamps & then unclamps. Repeats.
Unit does not
shutdown.
5. Tray out switch
S9001 open.
CN2011 Normal start up. Pressing the open tray button
permits the tray to open but it closes
automatically.
Tray will not
stay open.
6. Tray Loading Motor
CN2011 Front panel display = “Please Wait” or
“Open/Close”
7. Tray Rotation Motor CN2010 Front panel display = “Please Wait”
Motor = 14
ohms
Table 3
