Konka KDL48MT625UN, RCAL48T20 Smart, Top House KDL40MT538U, Top House KDL48MT539U LCD TVs SMPS schematic

 

Konka KDL48MT625UN 35018767 LCD TV POWER SUPPLY Schematic

RCA L48T20SMART TV SMPS schematic

Used Ics: N701: OZ9916:  NB905: FSL206MR:  NF903: FAN7930:  NW920: FSFR1700

 

Top House KDL40MT538U - KDL48MT539U TP.ISDB6308.PB81 LCD TV POWER SUPPLY

Thomson DPL923VD, DPL933VD, DPL943W – Schematic diagram

 DPL923VD, DPL933VD, DPL943W-THOMSON CIRCUIT DIAGRAM

LG 42 09LAC2, PHILIPS A 715G7735 and, VESTEL 17IPS17-1 using STR-W6253-(Power Switching)

 

VESTEL 17IPS17-1 PSU Schematic 19”-22”LCD TV (STR-W6253)

LG42 09LAC2 PSU Schematic

A 715G7735 PSU [Power Supply Unit] Schematic

Thomson CS1200VD stereo pre-main amplifier-PAL-NTSC – schematic diagram

 DVD stereo-Thomson CS1200VD full circuit diagram, wiring diagram

Wiring diagram

RF-IF SCHEMATIC DIAGRAM

Main schematic diagram

Power supply schematic diagram

Input-output schematic

Control schematic

Control-display schematic

MPEG video section schematic

MPEG audio part schematic

Main amplifier schematic

Aiwa CS 880E Schematic diagram, 3 band stereo radio casette recorder - description of the MD-3 mechanism – exploded view – vintage set

 

Aiwa CS 880E Schematic diagram, 3 band stereo radio cassette recorder– exploded view – Vintage set

Description of the MD-3 mechanism

With the plate button pressed, the trigger lever (PLAY ) moves in the direction of the arrow <- (1), the gear (PLAY ) is released from the boss of the trigger lever (PLAY ) engages with the gear flywheel and rotates in the direction of the arrow <- (2), the boss (A) of the gear (PLAY ) touches the trigger lever (PLAY ) and the gear stops rotating.

When the gear (PLAY ) rotates, the lever (PLAY ) moves in the direction of the arrow <- (3) along the cam groove on the rear of the gear to push up the operation chassis in the direction of the arrow «- (4).  The PLAY button which has been locked is released by pressing the STOP button, the trigger lever (PLAY ) moves in the direction of the arrow *- (5), the boss (A) of the gear (PLAY ) is released and the PLAY operation stops.

Description of the FF Operation
When the FF button is pressed, the trigger lever FF moves in the direction of the arrow (1), the boss of the gear FR cam is released and engages with the gear wheel to rotate in the direction of the arrow. <- (2), the boss (A ) touches the boss of the trigger lever FF and the gear FR cam stops. The FR lever B moves in the direction of the arrow «- (3) along the groove of the gear FR cam, the FR lever B moves in the direction of the arrow <- (3), the FR lever C compresses the gear of the FR lever Ass'y against the Take-up
reel disc ass'y to perform the FF operation.

REW Operation
When the REW button is pressed, the trigger lever REW moves in the direction of the arrow <- (1) and pushes the lever REW in the direction of the arrow <- (2). The trigger lever FF releases the boss A of the gear at that time, the gear FR engages with the gear flywheel, rotates in the direction of the arrow <- (3), boss B touches the trigger lever FF and rotation stops.  The FR gear B is moved in the direction the arrow «- (4) by means of the cam of the gear FR following the rotation of the gear FR , pulls the FR lever C in the direction of the arrow «- (5) and moves the FR lever ass'y in the direction of the arrow <- (6) to rotate the Take-up reel disc reel disc ass'y to perform the R E W operation.

Description of the PAUSE Operation
When the PAUSE button is pressed, the trigger lever PAUSE moves in the direction o f the arrow *- (1), the boss A of the gear PA U SE is released, engages with the gear flywheel and rotates in the direction of the arrow <- (2), the boss B touches the trigger PAUSE and rotation stops.  The PAUSE lever moves in the direction of the arrow •*- (3) along the cam groove of the PAUSE gear at that time. The PLAY idler lever and the pinch lever ass'y is moved to perform the PAUSE operation at that time.
When the PAUSE button is pressed again, the button is released from locking and simultaneously the boss B of the gear PAUSE is released from the trigger lever PAUSE and the PAUSE operation is released.

REC Operation
When the REC and PLAY buttons are pressed simultaneously, the trigger lever REC moves in the direction of the arrow +- (1 ).  The PLAY operation is performed simultaneously at that time, so the REC lever driver moves in the direction of the arrow «- (2),
pushes the lever RECA, B in the direction of the arrow <- (3), the interlocked slide REC plate pulls the rod, the slide switch is operated and the unit enters the R E C mode.  When one of the STOP, FF and REW buttons is pressed, the REC trigger lever is released from the REC lever driver and only the REC operation is released.

Description of the Auto-stop Operation
The motor rotation is transmitted to the gear auto-kick of the MD-3 mechanism via the slip pulley FR ass'y.  The slip disk presses the lever auto A in the direction of the arrow <- (1) when the Take-up reel disc ass'y is rotating, so the boss of the lever auto A moves along the cam (A) groove of the gear auto-kick.  When the reel discs (S, T sides) stop, the lever auto A stops in the condition being moves in the direction of the arrow (2).  The cam (B) of the gear auto-kick moves the lever auto A in the direction of the arrow «- (3), operates the plate auto-kick in the direction of the arrow «- (4) to release the plate lock and performs the AUTO STOP operation.

Spring application position

Exploded view

Schematic diagram

RQ-92 National-Panasonic Double Cassette Recorder schematic (Circuit Diagram)

 National/Panasonic RQ92 cassette recorder circuit diagram

Used ICs: AN6552, MN3007, BA3702, TA7240AP

Admiral Color TV schematic (Vintage TV)-Chassis K10 – Hybrid (using transistors and vacuum tubes) -1974 model

 (Hybrid) color TV - Admiral Chassis K10 - Vintage TV - 1974.  Spare component availability will be rare.  Just compare this with modern TV circuits, and feel how much the field of electronics have developed.  There was no integrated circuit (ICs) at that time. 

 The circuit consists of both tubes and transistors (Hybrid type). Tubes are used at its horizontal output and video output stage circuit. Most of these tubes are not available now.  Moreover the circuit boards are  dangerous to handle,  due to very high voltages  present on them,  while the set works. The picture tube is a Shadow Mask type,  need very high voltage,  in the range between 27 KV to 30KV, and have more than 33 alignment points.

 More to say,  these sets are very costlier at that time,  only very rich ones can afford it.  Actually, luxurious piece at that time  too. 

 This was the time, that I entered into this field  of electronics as a professional service technician. I'm 71 now,  and still continues. 

Layout – PWB

Schematic - Full

Circuit diagram-Split