5. Troubleshooting
Code 7703: “Power supply primary DCDC temp low” (Warning)
Situation Solution
The ambient temperature in the
area of primary side of the S MP S
is almost below the m inimum
required operating temperature of
the projector.
Make sure that the ambient tem perature is within specs: higher then 10°C (50°F). Let
the projector acclim ate. Do not ignite the lamp, otherwise there is a risk for condensate.
Defect temperature sensor
(reference 2image 5-34) which
measures the temperature at the
primary side of the SMPS.
Replace the temperature sensor mounted on the heatsink of the primary s ide of the
SMPS (reference 2image 5-34).
Code 7704: “Power supply primary DCDC temp high” (Warning)
Situation Solution
Blocked air inlet channel.
Ensure that the air inlet at the front bottom of the projector is not blocked. Prov ide a
sufficient free area at the front o f the projec tor so that fresh air can freely enter the air
inlet channel.
The wire unit of the S M P S is
disconnected from the Power
Distribution boa rd.
Check if the wire unit (reference 1 image 5-33) of the SMPS control is c onnected w ith the
power distribution board.
The wire unit of the temperature
sensor on the SM PS is damaged .
Check if the wire unit (reference 2 image 5-34) of the temperature s ensor on the SMPS
is not dam aged. Replace sensor and wires if necessary.
Malfunction Fan Control bo ard. Replace the Fan Control Board. See "Replacing the Fan control board", page 278.
Defect temperature sensor
(reference 2image 5-34) which
measures the temperature at the
primary side of the SMPS.
Replace the temperature sensor.
Code 7705: “Power supply primary DCDC temp high” (Error)
This error c ode is probably preceded by the warning code 7704: “Power supply primary DCDC temp hig h”. T he same troubleshooting
table can be applied to.
Code 7706: “Power supply primary DCDC temp open” (Error)
Situation Solution
The wire unit of the S M P S is
disconnected from the Power
Distribution boa rd.
Check if the wire unit (reference 1 image 5-33) of the SMPS control is c onnected w ith the
power distribution board.
The wire unit of the temperature
sensor on the SM PS is damaged .
Check if the wire unit (reference 2 image 5-34) of the temperature s ensor on the SMPS
is not dam aged. Replace sensor and wires if necessary.
Defect temperature sensor
(reference 2image 5-34) which
measures the temperature at the
primary side of the SMPS.
Replace the temperature sensor.
Code 7707: “Power supply primary DCDC temp short” (Error)
Situation Solution
Damaged wire unit of the
temperature sensor (reference
2 image 5-34 and im age 5-33).
Repair or replace the wire unit.
Defect temperature sensor
(reference 2 image 5-34) which
measures the temperature at
heatsink of the primary side of the
SMPS.
Replace the temperature sensor mounted on the heatsink of the primary s ide of the
SMPS (reference 2image 5-34).
Code 7708: “Power supply primary PFC temp low” (Error)
This error code is probably preceded by the warning code 7708: “Power supply primary P F C temp low” . The same troubleshooting
table can be applied to.
R5905312 HDF W SERIES 24/01/2013
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