Sir kipper . . . . .
As simple built as that unit seems to be . . . . . wanna pair up with me ? . . . . . and see if we can get that unit working again ?
You will have to be my remote hands and eyes.
On your #1 of 3 last photos . . . . .
With what info you have shown me . . . . there is my mentioned,
BIG Black Ice Cube power switching relay in the center of the board.
There also, are your
clipped off
RED-WHITE-YELLOW motor wires associated with switched power from that relay.
On your #2 of 3 last photos . . . . .. . . . .
We see 220VAC power coming in as the BROWN-BLUE wire pair and initially looping thru the ferrite Radio Frequency Interference suppression toroid and then into the minor board for some
RFI AC line filtering by that initial X rated yellow safety capacitor ( possibly using a 1 Meg shunt resistor) and then each wire passes thru its individual BLACK clad ferrite cored line
RFI choke coil and then is being "outputted" with a totally odd ball wire coding of GREEN and ORANGE wires.
I say "outputted", wherein ACTUALLY this boards function is attempting to suppress as much of the created, fire breathing and arcing motor brushes severe
RFI /
Electro Magnetic Interference /
CRAP from getting out and going back into the AC line . . . . . as is being possible.
A close by secretary's AM radio playing on her desk wouldn't fare any too well, while this monster is running.
While being on this photo, take note of the top right corner where I ? believe ? that the paper insertion slot is, there we have a RED and BROWN wire routed going over to what must be either a mechanical leaf switch (only needs 2 wire connections) or a photocell and LED emitter pair (they need 3 or 4 wire connections). This activates the shredder when paper is inserted . That RED-BROWN set of wires comes over and goes underneath the board at the empty WHITE 4 pin male connector. Now . . . .I can see one BLACK wire on the OTHER side of that unviewable electro-mechanical portion of the far side of that paper slot portion. What and where is its companion wire
and where do they route to ?
Going back to that initially mentioned BLUE-BROWN AC wiring at its loop thru ferrite balun, can you confirm that it then comes in directly from the AC line plug wiring ?.
A RED-ORANGE wire pair to the left, I suspect as going to the MAIN power rocker switch for the shredder.
No idea on what the, further to the left, smaller wire gauge BROWN - BLUE? wire pair go to . . . please inspect and fill me in.
Last item of interest is being the LARGEST BLACK E-capacitor at the bottom right corner of the main board.
That is the only possibility of the use of filtered DC to the shredder motor . . . . .but it would have to have a 400'ish DC voltage rating,
BUT . . . I am seeing 35V on top . . . . so it probably will be a 470-1000-2200 ufd and is being used as the MAIN DC supply filter for this units discrete electronics.
Thereby, the principal DC supply voltage will be 12' ish DC volts for that big relays pull in coil.
Going back to your #1 of 3 last photos . . . . .
First, see that boards top right corners vertically mounted wire pigtail fuse . . . it's not blown open is it ? (If its having a non viewable ceramic center cylinder . . .certainly looks like it . . . / versus / an easily view through clear glass one. )
If I am correct . . . . for you to confirm . . . . about its nearby RED and ORANGE wires being from the units MAIN power rocker switch.
Then the RED gets HOT AC power and passes down to that switch to come back as the ORANGE wire and that AC power, which passes thru the fuse and into the LARGE reddish -brown capacitor that has a selected capacitance value such that its AC capacitive reactance will drop that initially excessive 230 voltage source, on down to the much lower range that we need for our low voltage power supply after passing thru one of the diodes in the cluster just below the next largest BLACK E-cap just above them.
The giant BLACK E-cap at the very bottom corner is then being the main DC storage cap of the low voltage DC supply.
OBSERVATION . . . .
This unit appears to merely use just 5 discrete transistors .
Now we can make a leap forward of the equivalency of skipping 5 tests just by taking measurements on that uppermost transistor that is spaced down under the power relay by the two BLACK power diodes between them.
TIME TO MAKE TESTEE - TESTEE . . . . . #1
I can't see your disconnected motor wires as affecting your making this test.
So you might want to solder / clip on on a "flying" hook up wire to make a meter connection to the meters negative lead (or another wire/component
that is connected to it) of the large BLACK E-capacitor.
Use a meter set to + DC voltage and be prepared for a max of 50VDC . . .but REALLY only expecting ~12VDC
Meter negative lead goes to our earlier located large BLACK E-capacitor negative connection.
Now you power up using that main power switch and use meter + lead to test each of the three leads of that just earlier mentioned relay driver transistor.
One of its 3 leads ( its collector) should have ~ 12 VDC
IF the units power supply is working. If none is found on all 3 leads, we then test back at the power supply portions origin . . . . . to see why not ?.
I now stop for questions, if so needed . . . . or for your results . . . . plus ALL my earlier degrees of " uncertainty" questions being answered .
Plus, is that now vacant WHITE 4 pin male connector even used, and what it remotely connects to if being used. ( If so, I might suspect that multi position slide switch, being at the front center of the top panel of the unit.)
A like dimensioned and oriented photo, akin to your component side Photo #1 of 3 . . . . showing the foil side of the board would be helpful. ***
***
Because, the SANYOU SRU-S-112L Power relay did not show its extreme end suffix which is indicative of giving its power terminal connections and switching actions.
73's de Edd . . . . .
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