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ELECTRONIC COMMUNICATIONS, INC.
   A TELECOMMUNICATIONS  COMPANY

APPLICATION NOTES

Jerrold 400 Cable Converter Problems


The most common symptoms for these cable boxes relate to their not staying
on or acting erratically when the buttons are pressed.  The causes are usually    quite simple:


1. Cold solder joints around the power supply regulator ICs (on chassis
   heat sink).


2. Dried up main filter capacitors - two large electrolytics in power supply
   on main board.


Be careful disassembling the main board from the chassis as at least one of
the regulator ICs clipped to the side of the chassis is insulated from this
heatsink and the insulation is easily damaged.


ECI  has years of  experience in many  applications of repair and service,  and  you
will  feel confident in ours skills to meet any challenge .




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