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6. Sensor testing
These 7 electrical parts could cause transport problems but so can a broken
mechanical part. Test all 5 sensors and 2 motors as a group once the tray is
removed. If the parts test OK, the problem is mechanical or a ribbon cable is bad.
Testing the Tray Loading Motor and Related Sensors
With the tray removed (section 4), install the front panel to test the tray loading
operation. Plug in front panel ribbon cables CN2008 and CN2009.
Part
Setup
1. Tray
1. Rotate the
in – out
main gear to the
loading
disc clamped
motor
position.
2. Press power
on.
2. Tray
Unplug the unit
out sw.
from AC power.
S9001
3. Main
Press the power-
gear
on button.
position
Q9001
Main gear position
sensor S9001
SA-HT730 / SAHT930
Testing Parts 1/2
Do / Watch
After laser focus searches ("INIT"), the
loading motor turns to drive the
transport to the non-clamped position
("WAIT"). The unit will then shut down
("H01 error").
Measure the resistance between
CN2011 / pin 1 and pin 2.
Rotate the main gear to the position
shown in figure 4 inset so that you can
see the sensor in the cutout. Rocking
the gear changes Q9001's logic state.
Table 4
S9001 tray in / out test
Shorted - Tray out
Open – Tray in
[Front panel displays the
words "Open" or "Close".]
Figure 4 – Loading (Tray In – Out) Motor Circuit
Motor must turn belt and the
main black gear into the disc
unclamped position. Motor
resistance = 14 ohms. Motor
volts = 8Vdc. Between
CN2011/pins 8 & 10.
The switch is normally open
but shorted when pressed
(simulates tray out).
The voltage at CN2011/pin 6
will change from 0.1Vdc to
4.6Vdc as you rotate the main
gear to block Q9001's light.
10
Proof the part is good
Q9001 Main gear
position sensor test
CN2011 / pin 6 =
0.1V – 4.6Vdc as gear
is rotated
Inset
Main black gear position for
Q9001 sensor inspection
Cutout shows Q9001
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