J
Jan
- Jan 1, 1970
- 0
Need info on low voltage regulator str 30130.
Any advice appreciated.
TIA
Jan
Any advice appreciated.
TIA
Jan
Thank you for your input.Jan:
If it is not putting out regulated B+ @ 130 V DC it is most likely
faulty..... obviously the other supporting circuitry can cause a B+ faults
like shorted loads (always look for a bad HOT), bad pre-regulator diodes and
filter, faulty base drive/reference, open resistors, etc. The STR 30130 is
usually a fairly reliable unit as long as it is heat sinked well and the
solder connections aren't cracked or dry.... or there isn't a fault before
or after the chip.
Pin 1 Common
Pin 2 Base
Pin 3 Input
Pin 4 Output
Pin 5 n/c
Best Regards,
Daniel Sofie
Electronics Supply & Repair
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Jan:
Slow down a little.... there is a lot of successful troubleshooting and
repairing that can be done without a schematic. Take some time and trace
the circuitry with your eyes..... checking different components with your
DMM.
There is no high voltage because there is no regulated 130 v B+ coming out
of the chip and there are a lot of reasons that there is no voltage coming
out of the chip....... is there "raw" B+ at pin 3 ? (~ 150 V) of the
regulator chip as referenced to pin 1? Did you check for shorted parts and
components in the circuitry after the chip? (see my previous reply post with
suggestions) Do you have a replacement chip that you can install?
Jan,
One end of the relay coil connects to the standby power supply, the
other end to the relay switching transistor. The standby supply powers
the microprocessor, relay switching transistor and relay coil. When
the power button is pressed the microprocessor turns on the relay
switching transistor supplying 5 volts through a resistor to the base.
The relay closes and provides input to the STR30130. Look to see is
the base of the relay switching transistor getting its forward bias
when the power button is pressed.
Gordon Gaskell AAS
Home Electronics of Havre de Grace, Maryland