Table of Contents
Advertisement
LARGE SIGNAL
POWER SUPPLY
The FA is a COLD chassis of a single sided circuit board,
developed for a 27". The power supply section features
four IC's for voltages sources. The FA chassis has the
capability to meet the Energy Star requirement for a
low power consumption on stand-by mode.
·9Volts, 1Amp ON/OFF Switch Regulator, 221-01460-07
·5Volts, 1Amp ON/OFF Switch Regulator, 221-01460-03
·5Volts, 0.150 Amp Switch Linear Regulator,
0IKE780500P
·Main regulator for Horizontal Deflection (B+), +15V,
Switch mode regulator 223-00061-01.
·Error amplifier 221-00265-03A.
MPI
(INTERFACE)
+5VSB@2mA
AC LINE
LINE
FILTER
RECTIFER
SWITCHING
SECTION
HYBRID IC
+33VSW
+33VSW@15mA
+5VSW@100mA
+15VSB@100mA
TUNER
+12VSB@600mA
MICROPROCESSO
R
LSP
PROTECTION
+21VL
+5VSB
B+
+VAUD
+16VSB
+12VUP
SHUNT
OPTO
REGUL AT OR
DEVICE
POWER SUPPLY BLOCK SCHEMATIC
SERVICING
SWITCH MODE REGULATOR
The FA chassis employs a switching power supply, quasi-
resonant topology type. The AC line is supplied thru
the bridge rectifier BRX3400 and CX3410 circuit through
the fuse FX3400 (5A @ 250 V fast blow), The AC opera-
tion range is between 90 Vrms to 135 Vrms (see TABLE
1.1) and a filter, consisting of LX3400, LX3401, CX3401,
CX3403 and CX3408, which is employed before the rec-
tifier circuit to reduce noise from the AC line and vice
versa (EMI).
The voltage output of the rectifier, VDC, is supplied to
the Switch Mode Regulator Power Supply, and its out-
put should be in this range [127 VDC to 352.5 VDC].
The SMPS consisting of ICX3612, ICX3701, ICX3702 and
the chopper transformer TX3600. Through 100 KOHM
resistor (Rst), RX3601 and CX3604 (Cst), which is de-
rived the VCC from CX3410. These feed the pin 3 into
the internal zener diode located within ICX3612.
HORIZONTAL
DRIVE
+130V@900mA
SWEEP
TRANSFORME
R
ABL
+5VSBF@27mA
+9VSW@120mA
+5VSW@70mA
+9VSW
+5VSW
+5VSBF
+VAUD@1400mA
PWR CTRL
ST AUDIO
3-1
HV
-14VSW
+35VSW
+12~14VSW
6.3Vrms
205VSW
+5VSW@80mA
COMB FILTER
+9VSW@50mA
-14VSW@
+9VSW@5mA
VIDEO
PROCESSOR
+9VSW@70mA
+9VSW@55mA
STEREO
SWITCH & VOL-
DECODER
CTL
6.3Vrms@315mA
FILAMENT
+14VSW@
VERTICAL
DEFLECTION
SWITCHER
CXA2089S
FA - SERVICING
Advertisement
Table of Contents
