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9. Technical Board Information
9.1.3
Format Power board
Block diagram
Format Power Board
IC7
DC 380V from PFC
5
4
3
2
F
S
X
L(M)
D
7
1
C
3
T2
+B
COL
1
5
4
AUX
GND
D14
C53
1
2
4
3
ISO3
1
2
4
3
ISO4
IC4
DC/DC Converter
D11
2.5V
GND
D13
5V
IC6
Linear regulator
D15
GND
GND
D81
D82
D83
D84
3.3V
IC8
TL431CLP
IC500
>>Input
OV/UV
Protec
Output
V
9
12
16
3
5V from Standby
Image 9-4
Block diagram Format power board
Description
The format power board repeats operation which turns on an off at pin 7 of IC7, and the pulse appears in secondary sides through
the converter transformer T2. At the time, the voltage of 3.3V at the secondary side is detected by IC8, the negative feedback to IC7
is carried out at photo coupler ISO3 and then the voltage is stabilized. Other outputs are determined by the turn ratio of secondary
side of T2, and the voltage rectified, smoothed through the series regulator (5V is stabilized at IC6, 2.5V is stabilized at IC4). The
voltage rectified ans smoothed by D14 and C53 at primary winding of T2 is supplied as a power supply voltage of IC7 on primary
side.
The format power board is a flyback voltage mode controlled and switched by a hybrid IC7, which has 6 pins that includes pi 5 (F) for
frequency setting (short to C is 66kHz, to S is 132kHz); pin 7 (D) for drain of MOSFET; pin 4 (S) fo source of MOSFET; pin 2 (L) for
line sense; pin 3 (X) for external current limit (on-off controls, current limiting) and pin 1 (C) 5.7Vdc for control feedback. Main control
loop comes from 3.3Vdc output that was connected to error amplifier IC3, isolated photo-coupler ISO3 and feedback to control pin
1 in the primary side. In addition, the others output also regulated by dropper and dc-to-dc converter for +5V and +2.5V separately.
IC500 is a protection IC for sensing OV and UV in the output voltage. Once abnormal voltage was detected , it will be shut down
the IC7 by ISO4 immediately.
R5976766 RLM G5 22/04/2004
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Summary of Contents for RLM G5 Performer
Page 1: ...RLM G5 Service Manual R9010020 R5976766 00 22 04 2004...
Page 4: ......
Page 8: ...1 General Information 4 R5976766 RLM G5 22 04 2004...
Page 16: ...2 Safety 8 R5976766 RLM G5 22 04 2004...
Page 18: ...3 Safety Symbols 10 R5976766 RLM G5 22 04 2004...
Page 23: ...5 Technical Informations 14 R5976766 RLM G5 22 04 2004...
Page 25: ...6 Spare Parts list 16 R5976766 RLM G5 22 04 2004...
Page 55: ...8 Module Unit Identification 46 R5976766 RLM G5 22 04 2004...
Page 69: ...9 Technical Board Information 60 R5976766 RLM G5 22 04 2004...
Page 81: ...10 Mechanical Parts Identification 72 R5976766 RLM G5 22 04 2004...
Page 91: ...12 Projector Suspension Stacking 82 R5976766 RLM G5 22 04 2004...
Page 95: ...13 Maintenance of the Projector 86 R5976766 RLM G5 22 04 2004...
Page 103: ...14 Software Update 94 R5976766 RLM G5 22 04 2004...
Page 107: ...15 Troubleshooter RLM R5 Performer 98 R5976766 RLM G5 22 04 2004...
Page 111: ...A Technical Specifications 100 R5976766 RLM G5 22 04 2004...