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This circuit is also use operational amplifier IC LM324 to drive the VN64GA with the error signal and to control output voltage. This output voltage is pulsating DC , which is quite satisfactory for battery charging. This circuit also can be converted to the system regulated DC supply. You do this by increased C2 and anoother electrolytic capacitor is added across the load. The respon time is very fast, determined by the op amp. Schematic and troubleshooting below : If the circuit not work , Perhaps the cause of : AC cable disconnected Transformer is damaged or leaking.  Broken or leaky diode. Installation of inverted foot elco. Instrallation of the components of the upside , particularly on the transistor , examine the placement of the feet emitter , collector and base. IC damaged. Soldering is less sticky. Line PCB damaged.

The neck on this Hofner Colorama was originally quite badly back bowed, as shown here: In an effort to rectify this, we’ve tried three different approaches, as follows: 1. While re-radiusing the fretboard, more pressure was applied towards the middle of the neck in order to remove more fretboard material in that area. This would not straighten the neck, per se, but it would reshape the top of the fretboard in such a way that its top would end up being flatter. 2. When refretting, the fret slots were widened. When frets are forced into narrower slots, this has a tendency to force the neck to back bow, so we wanted to avoid this at all costs. The slots are still narrow enough to grip the new frets, but are certainly not overly-tight. 3. Obviously the truss rod nut was slackened as much as possible. In fact, even with the nut removed, the neck still maintained a back-bowed shape. It was noticed that the washer under the nut was wedged into place, and it was suspected that it might be pre...

TDA9341 – AT24C08 - CD4052 – AN7522 – TDA2003 – [LOT BSC25-N0832/BSC25-T1010A/BSC24-01N4014K] – Transistorized SMPS FBT variations: FOR 29”  BSC26-01-N4010F BSC26-N2143 BSC26-01N4010E BSC26-N2148 BSC26-01N4004F BSC26-01N REPLACEMENT OF MEMORY IC This TV circuit uses memory IC. In the memory IC are memorized data for correctly operating the video and deflection circuits. When replacing memory IC, be sure to use IC written with the initial value of data. PROCEDURE FOR REPLACING MEMORY IC (1) Power off Switch the power off and unplug the power cord from AC outlet. (2) Replace IC Be sure to use memory IC written with the initial data values. (3) Power On Plug the power cord into the AC outlet and switch the power On. (4) Check and set system default value: 1) Press “ MENU ” key followed by digits ' 6''4''8 ' and '3' . Then Press “TEST” key on the Remote control unit for factory used. 2) The red “M”or”factory” will be displayed on the screen, repeat this and ...