Power Supply And Failure Detection - Sanyo PLC-EF60 Service Manual

Chassis Description & Troubleshooting

9. Power Supply and Failure Detection

Detection of Power failure
Projector provides a protection circuit to prevent the secondary failure when the power failure, fans failure or tempera-
ture failure occurs on the projector. The power failure detection lines "PF_S16", "FAN_PF13", etc. are connected to
the main power supplies and fans. When the failure occurs, IC801<CPU> receives an error information through the
power failure detection lines and turns off the signal "POWER_SW_CPU" output from pin 211 to stop the power sup-
ply operation.
In the DVI, AV and MOTHER board, the power failure detection signals are sent to IC9016, IC9017<I/O EXPANDER>
and then sent to IC801<CPU> through the IIC bus line. In the MAIN board, the power failure detection signals are sent
to IC4713, IC4714<I/O EXPANDER> and then sent to IC801<CPU> through the parallel bus line. In the LCD board,
the power failure detection signals are sent to IC4411<I/O EXPANDER> and then sent to IC801<CPU> through the
IIC bus line. For fans FN909 and FN913, the power failure detection signals are sent to IC4714<I/O EXPANDER> and
then sent to IC801<CPU> through the IIC bus line. For fans connected to the SUB POWER board, the power failure
detection signals are sent to IC801<CPU> through the IIC bus line.
Diagnosis Information of Power Failure
Detecting Signal Failure Circuit/Parts
FAN_PF1 Failure of FN901
FAN_PF2 Failure of FN902
FAN_PF3 Failure of FN903
FAN_PF4 Failure of FN904
FAN_PF5 Failure of FN905
FAN_PF6 (x) Failure of FN906
On the MAIN board
PF_6V Failure of 6V, 5V, 5VA, 3.3VD_AD1, 3.3VD_AD2, 1.8VA and peripheral circuit.
PF_3.3V Failure of 3.3V, 3.3VA, 1.5V and peripheral circuit.
PF_-5V Failure of -5V and peripheral circuit.
PF_16V Failure of S16V and peripheral circuit.
PF_MOTOR16V Failure of 16V on the AUDIO, MOTOR board and peripheral circuit.
On the LCD Drive Board
PFLCD_16V Failure of S16V and peripheral circuit.
PFLCD_15.5V Failure of 15.5V, IC4552 and peripheral circuit.
PFLCD_12V Failure of 12V, IC4551 and peripheral circuit.
PFLCD_3.3V Failure of 1.5V1, 1.8VGS and peripheral circuit.
On the MOTHER Board
5VMTH_PF Failure of 5V and peripheral circuit.
9V_MTH_PF Failure of 9V and peripheral circuit.
-5VMTH_PF Failure of -4.7V and peripheral circuit.
3.3VMTH_PF Failure of 3.3V and peripheral circuit.
On the DVI Board
-5VAV1_PF Failure of-4.5V and peripheral circuit.
3.3V_1AV1_PF Failure of 3.3V and peripheral circuit.
3.3V_2AV1_PF Failure of 3.3V_DV and peripheral circuit.
5VAV1_PF Failure of 5V and peripheral circuit.
On the AV Board
2.5VAV2_PF Failure of 2.5Vand peripheral circuit.
3.3V_1AV2_PF Failure of 3.3Vand peripheral circuit.
3.3V_2AV2_PF Failure of 3.3V_2 and peripheral circuit.
5V_1AV2_PF Failure of 5V_1V and peripheral circuit.
5V_2AV2_PF Failure of 5V_2V and peripheral circuit.
-5VAV2_PF Failure of -4.5V and peripheral circuit.
Detecting Signal Failure Circuit/Parts
FAN_PF7 Failure of FN907
FAN_PF8 Failure of FN908
FAN_PF9 Failure of FN909
FAN_PF10 Failure of FN910
FAN_PF11 Failure of FN911
FAN_PF12 Failure of FN914
FAN_PF13 Failure of FN913
- 81 -