Overview Of Operation - Epson EMP-TW1000 Service Manual

2.5.2 Overview of Operation

The output cable of the power supply unit is connected to CN4000 on the MA board. It allows
the following voltages and signals to be transmitted.
• DC output
• The power supply On/Off signal (PWON)
Background power is still supplied to the MA board through CN4000
C A U T I O N
connector as long as the power cord is connected to the projector, even if the
[Power]
The EMI filter/regulator circuit eliminates interference (noise) from the AC
line and generates the DC voltage for the regulators.
The DC voltages shown in the tables below are generated by a Switching
Regulator. No fluctuations in output potential occur as a result of load
fluctuations, and the individual output voltages cannot be adjusted.
Output voltage
Output
voltage
Signal
Voltage
accuracy
name
4.75 -
+5 +5V
5.25V
13.5 -
+13.0 +13.5V
16.0V
+18 +18V 16 - 23V
Ballast 360 -
375V
output 400V
The power supply fan reduces the internal heat in the power supply unit. The heated air
discharged from the power supply unit is then exhausted with the exhaust fan connected to
CN1303 on the MA board.
SEIKO EPSON
EMP-TW1000
switch is turned off.
Table 2-2.
Ripple/
Ripple
Spike
Standby
(mVpp)
(mVpp)
mode
20mA-
100 200
220mA
200 300
400 400
25Vpp 25Vpp
Output current
MIN. Typ
0.9A 3.5A
0A 0.2A 1.5A
0A 0.2A 0.6A
-
2-12
Protection circuit
capacity
Over Over
(Reference)
voltage current
short-circuit
-
protection
short-circuit
- 100+470
protection
short-circuit
-
protection
410V -
Revision:A
Load
(µF)
200
47
-