2-12
EMP-TW1000
SEIKO EPSON Revision:A
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)
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.
C A U T I O N
Background power is still supplied to the MA board through CN4000
connector as long as the power cord is connected to the projector, even if the
[Power] switch is turned off.
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.
Table 2-2.
Output voltage
Output
voltage
accuracy
Ripple
(mVpp)
Ripple/
Spike
(mVpp)
Output current Protection circuit Load
capacity
(Reference)
(µF)
Signal
name
Voltage
Standby
mode
MIN. Typ
Over
voltage
Over
current
+5 +5V
4.75 -
5.25V
100 200
20mA-
220mA
0.9A 3.5A -
short-circuit
protection
200
+13.0 +13.5V
13.5 -
16.0V
200 300 0A 0.2A 1.5A -
short-circuit
protection
100+470
+18 +18V 16 - 23V 400 400 0A 0.2A 0.6A -
short-circuit
protection
47
Ballast
output
375V
360 -
400V
25Vpp 25Vpp - 410V - -
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