Fujitsu 154V, MCM1514V, C551, D556Q manual

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5-5 TRANSISTOR & DIODE CIRCUIT

LOCATION	CIRCUIT FUNCTION DESCRIPTION
D901 ~ D904	Bridge Rectifier for AC Source
D909	Half-Wave Rectifier for Start CKT
D910	Clamp Diode for Snubber CKT
D919	Rectifier for Output Voltage
D922	Rectifier for Output Voltage
D923	Rectifier for Output Voltage
D925	Rectifier for Output Voltage
D927	Forward Bias when Q403 Turn-off to Protect B+ Block CKT
D929	B+ Feed Back Rectifier from F.B.T Pulse
Q904	Start CKT Amplifier Transistor
Q907, Q908	Use for Off-Mode to Cut-off 6.3V Supply Voltage
Q909, Q910	Use for Standy-By or Suspend Mode to Cut-off 14.5V Supply Voltage
Q912, Q920	Push-Pull Topology to Drive Q911
Q401	Turn-on at Power ON/OFF and Change Mode to Protect Hor.Block
Q402	HOR. Driver Transistor
Q407, Q408	As a Switcher for H-Size Correction CKT
Q410, Q426	H-Size Corection Mosfet (Q426 15" only)
Q404, Q405	As Differential Amp. to Drive Q406
Q406	Darlington Transistor for H-Size Control
Q703	As a Switcher to Mute Screen when Abnormal Qccurring
Q704, Q705	Unit Brightness Control CKT
Q601, Q707	Develop Blanking Signal
Q813, Q814	A Amplifier to Corection and Support Clamp Signal

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Contents Color Monitor Page Table of Contents Specifications for 154V/C551 Color Monitor Service Notes Precautions and NoticesSafety Precautions Product Safety NoticeHigh Voltage Warning Operating Instructions Adjustment Method Adjustment Adjustment Conditions and Precautions Main AdjustmentsRelative Placement of Typical Components Deflection Circuit Power SupplyCircuit Description Micro CircuitPage Abnormal Power Supply Abnormal DDC Plug & Play Abnormal Video Level on ScreenNo Blanking No Signal on ScreenAbnormal Display FBT PIN 5 on Main PCB Abnormal Horizontal Size HOR./OSC/DEF/HV Circuit FaultNo Raster Disconnect with Signal Cable Abnormal Horizontal DeflectionAbnormal Vertical Size Abnormal Vertical ScanningAbnormal Horizontal Video Center Abnormal Horizontal LinearityPoor Focus SIDE-PIN Cushion DistortionPower Supply Trouble Shooting Chart Page Specification Parts List of CabinetParts List of Chas Fuse Diode GUF30G FBT Main Board Parts List of Main PC Board104 1UF +-5% Diode IN4148 D701 93A 11F 52T Diode BAV20 J041 95A 159 52T J120 95A KSA733GC Samsung R165 61A 602 222 52T 102 52T 1K OHM +-5% 1/6W 222 2K OHM +-5% 1/4W 101 304 R709 61A 602 103 52T 52T 12.7V +-5% 1/2W TZX20B Parts List of CRT Auto INS. PC Board Parts List of CRT PC BoardD802 93A 11F 52T TR. KSC945GC 1MEG OHM +-5% 1/4W Parts List of IC904 Assy Parts List of IC802 AssyParts List of Q911 Assy Parts List of IC601 AssyParts List of Cabt Assy Parts List of Q403/Q406/D408 AssyParts List of AC Linet Assy Parts List of Q901 AssyParts List of CRT Alternation 33uF +-5% Function KEY UP/DOWN Control LED Control Power ON/OFF Switch LM2438T IC Block DiagramsIC601 TDA9302H TDA9111 IC801 LM1279N Page Page Model KEY LED Vgnd Comp SDA GND Clamp CAP Drive