Sanyo PLV-Z3 - An abnormality occurs on the secondary power supply lines; An abnormality occurs on the fan control circuits; An abnormality occurs on power starter signals

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WARNING (red)
indicator are
lighting?
Yes
From previous page
Check power supply lines, S5V,-5V, S16V, etc. on the Main
board.
- Refer to the diagram "Power Supply Lines".
An abnormality
occurs on the sec-
ondary power sup-
ply lines
Power failure detection diodes detect the fan operation stop.
Check FN901, FN902, FN903, FN904, FN905 and peripheral cir-
cuit.
- Fan Lock signal is "H", and FAN_ERR signal is "L".
An abnormality
occurs on the fan
control circuits.
Check power starter signals as follows:
- FAN_SW signal (Power-on:H) is output from pin 12 of IC1822 and
applied to the Power Board. It drives the power oscillation circuit
and power supply for the cooling fans in Power Board.
- SI_SW signal (Power-on:H) is output from pin 13 of IC1822 and sent
to IC3601, then 3.3VSI line is supplied.
- ON_15V signal (Power-on:H) is output from pin 14 of IC1822 and
sent to Q591, then 15V line is supplied.
- ON_5V signal (Power-on:H) is output from pin 15 of IC1822 and
sent to IC4621, IC8281, Q4601, Q4611, then 12V, 3.3V_A, 5V, -5V
lines are supplied.
- ON_3.3V signal (Power-on:H) is output from pin 16 of IC1822 and
sent to IC1401, IC1411, then 3.3V, 1.8V lines are supplied.
An abnormality
occurs on power
starter signals.
Check following
items
Troubleshooting
Troubleshooting
POWER
red/green
Indicators
WARNING
red
POWER (red)
indicator is flash-
ing?
The symptom indicates that the projector detected an
abnormality in the lamp driving signal.
Check the lamp driving signal.
- LAMP_POW signal (Power-on:L) is output from pin 19 of
IC1824 and sent to IC4841 via IC4826.
SCEL signal (Lamp-on:L) is sent to Lamp Ballast Unit through
SW8803(Lamp Cover SW).
- TXL signal is output from pin 3 of IC4841 and sent to Lamp
ballast Unit via IC4881.
(TXL signal is applied for lamp power control. Lo: Low power,
Hi: High power)
- RXL signal (Lamp status signal) is output from Lamp Ballast
Unit and sent to pin 4 of IC4841 via IC4881, then LAMP_ERR
signal is output from pin 7 of IC4841 and sent to IC301 via
IC1801.
If an abnormality occurred on the lamp ballast unit, RXL signal
and LAMP_ERR signal become "H" and then the projector will be
cooled down and to stand-by mode (POWER indicator lights red).
Yes
No
The symptom indicates that the projector detected an
abnormality in the cooling fan operation or in the power
supply secondary circuits. Check fan operation and power
supply lines, and the driving signal status.
- POWER_FAIL (Error:L) signals are sent to IC301 via IC881
and IC1801, then IC301 shuts down the power supply circuit.
Cooling