Epson PowerLite 5000 Service Manual page 37

•
An interlock switch is included for safety. The interlock switch shuts off the supply of
AC power if the lamp cover at the bottom of the main chassis is open.
•
The safety switch input signal stops power output to the light source lamp if the
projector detects overheating. The safety switch is mounted on the light guide unit
attached to the lamp inner housing.
Functional Outline
•
The interlock switch at the bottom of the main chassis shuts off power when the lamp
cover is opened. It is normally at the ON position.
•
The power supply cable is connected to CN800 on the main board. The following items
are also connected to CN800:
DC output line
PWDS signal for the power on/off control
Lamp power on/off control signal (LPSTC)
Background power (+3.3 V) on/off signal (BACTA)
Caution:
If the AC power cable is still connected after the power is shut off, +3.3 V background
voltage is supplied to the main board via CN800 and power on/off circuit.
•
The filter/rectification circuit reduces noise on the AC line and generates DC voltage for
the regulator.
•
The regulator generates the various DC voltage levels shown in the table below for the
switching regulator. The regulator detects the voltage output level at the +5 V line and
feeds the information back to the switching circuit to maintain a stable output level
regardless of load variations. Not every output voltage level is subject to adjustment.
Table 2-2 Output Specifications
Power Source
Output voltage accuracy
(%)
Ripple (mV p-p)
Ripple/Spike (mV p-p)
Output current Min (A)
Rated (A)
Peak(A)
Overvoltage protection
Overcurrent protection
Use
NOTE : Protection is the transient detection type, it is recoverable with power on.
+5 V +3.3 V
± ± 5 ± ± 5
200 100
200 100
1.0 0.3
2.4 2.0
- -
+7 V +4.6 V
Transient Distortion
(Note)
Logic circuit Logic circuit
2-7
EPSON PowerLite 5000 Service Manual
+12 V +12 FV
± ± 5
12.0-13.8 V
100 400
100 400
0.2 0.05
1.0 1.5
- 2.0
- +16 V
Distortion Transient
(Note)
Analog Fan/Audio
circuit circuit
+22 V
19.0-24.0 V
400
400
0.0
0.3
-
+30 V
Transient
(Note)
Light valves