Replacement ZP1 transformer for Macintosh Classic

[yacolek]

Hi!
I'm trying my best to repair my Macintosh Classic. It's completely dead - no sign of voltage on mainboard connector/hdd connector.
I've already reccaped the analog board. When i was measuring things around i've noticed that all pins (8-14 so i guess it's the secondary winding?) on one side of transformer are all shorted to ground.
Well that doesn't look good, right? I've desoldered the ZP1 to check it outside of the circuit. Looks like i have direct short between pin 12 and 11, but the schematic shows some kind of connection there (coil?)
Pin 10 is ground, and it's directly connected to pin 11 - so 10, 11 and 12 connects to ground -am i missing something here?
I've measured the board without the ZP1, and there are no shorst between pin 8 to 14. Short appears only when ZP1 is soldered in place - especialy when pin 12 is properly soldered.

And of course - i'm not getting any voltage out of this transformer, 0v on all pins. Input pins on primary side shows ~300v and around 3-5 volts on another - are those values okay?

Does any of you know the specific transformer part# or know any current replacement for it? Googling around for 'tr204s-i2' or 'ETS39K545A 083g' doesn't give any results. Can't find any replacements

Any help/tips? i'm looking around for another analog board, preferably working one.

 

[robin-fo]

Looks like i have direct short between pin 12 and 11, but the schematic shows some kind of connection there (coil?)

I'm no electrical engineering expert but a coil is obviously some kind of direct wire connection.. So no wonder you measure little resistance across it The magic only happens when some current flows through it.

My guess is that the transformer might be ok...

 

[yacolek]

I'm no electrical engineering expert but a coil is obviously some kind of direct wire connection.. So no wonder you measure little resistance across it The magic only happens when some current flows through it.

My guess is that the transformer might be ok...

sorry i might have spelled something wrong, i'm no expert in electronicts also, just a hobbyist

the ZP1 - after desoldering out of the board - yes it have some direct connections, i know there are some coils on it. BUT! pins from 8 to 14 are not connected all with each other, there are some connections which are indeed the coils.

But after soldering it to the board, the pins 8to14 seems all connected, thus connected to ground. Without ZP1 in place those pins aren't shorted together.

I'm not getting any voltage out of this transfomer, 0 V on all pins on secondary, so i think that's the problem with this analog board.

 

[yacolek]

I made a photo of my analog board, i've reflowed some pins, yes there is one pin missing on the photo - it got resoldered after that.
Yet still, those points inside the white circle are all shorted together and shorted to ground. Is this normal?

 

[yacolek]

If anyone else wil be wondering the same question in the future - yes, those pins are shorted to ground when you do the basic checkup.

However if you aren't getting any voltage past the ZP1 - there is problem with either CNY17g or TDA4605.

The new CNY17G and TDA4605 arrived so i've replaced those.
After that the mac is trying to start (before it was 100% dead with no power). Now it powers on but shows sad mac with error code - probably something with ram...

0000 0005
0020 0000

Without the ram expansion it just shows black/white horizontal stripes... The search continues!