2-9
EMP-9000/8000
SEIKO EPSON Revision:A
(1). Outline of function
• AC input circuit department: Include AC input connector, thermostat and EMI filter circuit.
The AC voltage is supplied via the filter unit and safety switch, when the power cable is
connected.
• Safety circuit department: Include the thermostat on the AC input circuit. The thermostat
cut off the AC power when it becomes overheat condition.
• Ballast power supply circuit department: It is the circuit that generates the power supply
(DC240~390V) for the lamp inner housing according to the power ON/OFF control signal
of the main board Assy unit. The output cable is connected to the ballast unit.
• The primary regulator circuit: The DC voltage is generated by rectifying and stabilizing the
AC power supply. This DC voltage are supplied to the sub power supply circuit and ballast
power supply circuit.
• Regulate the DC voltage that is generated with primary regulator circuit with DC-DC
switching regulator then produce the various bios as shown in the next table. This DC-DC
switching circuit has feedback function with +7V output and reducing the fluctuation of
output. (Adjustment of individual output voltage is not possible.)
• Cooling fan: The heat that occurred with the power supply unit is radiated. The fan bios
(+12V) is supplied from CN201 of the power supply unit.
• The sub power supply circuit (+3.3R): Always+3.3V be output irrespective of the ON/OFF
of the power supply if the AC voltage is supplied. (It is used to the power ON control circuit
on the main board Assy unit.)
The circuit power supply output is as next it showed it.
(2). Input / output specification
Output voltage +3.3R +12R +7 +18 -11 +13 Ballast output
Output voltage precision % or V
0.2V
V5% 6-7.5V 17-20V 10-13V 12-15V 240-390vdc
Ripple mVp-p 100 100 200 200 200 400 20000
Ripple+Spike mVp-p 100 100 200 200 200 400 20000
Output current Min A 0.2 0 0 0 0 0 0
Typ A 1.6 0.2 1.6 0.7 0.3 1.7 0.8(360V)
Max A 2.5 0.3 2.5 1.2 0.5 2.5 1
Peak A 10
Over voltage protection +4.6V 410
Over current protection Exist Exist Exist Exist Exist Exist
Table 2-2 AC input (CN103 N/L)
AC Input Rating Tolerance
Input voltage AC100~240V AC85~276V
frequency 50 / 60Hz 48~62Hz
Table 2-3 Ballast output
Pin No. Signal name
2 HGNT(-) Ballast out put (-)
1 BAHV(+) Ballast out put (+)
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