Panasonic SA-PT660 Technical Manual page 23

Mech Troubleshooting.
Slide # 23
When the mechanism does not work correctly, is the problem mechanical? Is it
a sensor under the mech? Is it on the main board by the microprocessor?
Isolation Procedure:
1. Note which tray is in the laser assembly. Unplug the ribbon cable at CN2011.
2. Compare the dc voltages at the 11 pin connector (without the cable inserted) to the
"No cable" column voltages shown below.
Check the pull up resistors and check the main board for cracks.
3. Note the position of the trays in the mechanism. Reconnect CN2011.
4. Compare the dc voltages at the same CN2011 connector to the corresponding
column in the chart below (cable inserted). Pictures are on the previous page.
If any of the voltages do not agree with the chart below, the corresponding sensor (Q1-5, Sw3,4) is
bad. If the voltages all agree, the mechanical assembly is defective or out of alignment. Replace
the assembly, or do the prev. transfer alignment.
CN2011 Connector Voltage
CN2011/ No CN2011
pin cable
1 8.2V 7.5V
2
3 5Vdc 5Vdc
4
5 5Vdc 0Vdc
6 5Vdc 0Vdc
7 0Vdc 0Vdc
8 0Vdc 0Vdc
9 5Vdc 0Vdc
10 5Vdc 0Vdc
11 5Vdc 0Vdc
Is it the Mech or the Circuitry?
If any are different, the main board is at fault.
Tray Trays All trays
1 in 2-5 in out corresponds to:
7.5Vdc 7.5Vdc Motor driver Vcc
gnd
5Vdc 5Vdc Q4 Mode sensor
gnd
5Vdc 0Vdc SW3 Top sw
0Vdc 0Vdc Q1 UD (lever
sensor)
0Vdc 0Vdc Motor fwd
0Vdc 0Vdc Motor rev
0Vdc 0Vdc Q2 close (gear
sens)
0Vdc 5Vdc Q3 home (gear
sens)
0Vdc 0Vdc Q5 open (lever
sens)
CN2011/pin Changes
during
No change
Elevator dwn
Trays
stocked
Tray moves
back / forth
H at tray out
Outline Models:
Wireless SA-PT660
Mech SA-PT760
Pwr Supply SA-PT960
Protection SA-PT1060
Audio SH-FX67, 85