HISTORY:
Sustainability is the name of the game! Anything that can be reused or repurposed creates Ee savings and reduces the poisoning our environment when items are buried in the earth at the local tip needlessly.
Never heard of Ee? It is a concept that creates a measurement of ALL things (not just electronics) that humans have made and the energy used in obtaining the raw material, processing the materials right through to a finished product and even should include the shipping of the item to the distributors/retailers.
If you would like to know more about Ee values, please take a look HERE
So who may want just the power supply assembly for the PIONEER Z-93?
Servicing or restoring another Z93 Midi system where it is known that the power supply section has failed OR as a component "farm", particularly the larger transformer - great for a custom audio power amplifier of similar power (Audio amplifier was rated at 90W + 90W)
Good, clear service documentation is available online for the Z93 but take a deep breath before digging into your Midi system, it can be a challenge! In particular are the myriad of interconnecting ribbon cables. Some are hard wired into the PCB (grey/greenish coloured top section) and others can be removed, if you know how! The white connectors are like this, it can be seen that they "clamp" together holding the ribbon cable wires in the process BUT do not try to lift the top section of the connector upwards to release the ribbon cable - it will not work and you risk destroying the connector! It is actually easy to remove the cable (but not so intuitive) - PUSH DOWN on each end at the same time and while this downward pressure is applied, lift up and out the ribbon cable - it will release easily! You really need three hands but a "widely spread" pair of small pliers can help. Use the pliers to apply the light downwards pressure evenly to the connector top section (at each end) and use your other hand to lift up the ribbon cable out of the connector spring contacts. Bingo! you have freed the ribbon cable - insertion is the reverse process.
PIONEER - MIDI Stereo System Component
COMPONENT: POWER SUPPLY ASSEMBLY (AC Input boards, complete)
Part #: AWZ2241 PCB plus ATS1254 Main transformer
Hard wired for 240V AC operation although it looks as though there is a 120V AC input tap available (if required)
Supplied as in the photograph, interconnecting wires between the main transformer and the secondard transformer with regulator circuits PCB above are all intact - BE CAREFUL!, those bare wires are carrying 240V AC when live.
DIMENSIONS:
COMPLETE MODULE (When installed/side mounted): 135mm Wide x 148mm Rear towards Front x 110mm Height
MAIN TRANSFORMER (With the copper strap): 78mm H x 90mm W x 95mm D
TOTAL WEIGHT: 2.8Kg
COSMETIC CONDITION:
Very nice condition!
CLEAN
NO damage to components or the AC interconnect wiring (6x tinned bare copper wire 0.75mm diameter)
NO component stress observed
OBSERVATIONS:
Known to be fully functional as it was removed from our Z93 with the failed twin cassette decks, however once removed I did a quick check on the secondaries of the Main Transformer (ATS1254) and I can see the main audio output supplies of 46V each (open circuit) and Auxiliary supplies of 22V AC (dual) and the 4V AC supply. All looks fine, nothing "bad" happened during the retrieval process!
Two fuses on the top PCB (with the regulator circuits) and there are a further two fuses on the main system board - if you have a non-working Z93, check all of these fuses, they can be easy to miss. Of course, if a fuse has "blown", you will need to find out why!
I love the main transformer, very well made E core type with that lovely copper strapping. If this transformer was being used in another amplifier, it will cruise along providing two separate windings of 46V AC at around 2.5A each and also those 22V AC windings which would be great for a dual rail Op amp based preamp section.
If you are wondering where are the filter caps for the audio amplifier section (preamp and power output), those are all on the main board which connects to this Power Supply module via a ribbon cable which is hard soldered at each end, that is why I have removed the ribbon cable PCB at the main transformer secondary pins.
The way PIONEER has fabricated the PCB and Main transformer together is a bit precarious when not mounted inside the case so I have now safely wrapped up this module onto a stiff card base along with foam & bubblewrap to prevent damage due to movement. This is how it will be shipped.
