SL-75KAV Lost book with motherboard scheme, so don't know to connect wires. I don't know which connect is primary/secondary, where is sound processor output, and pins problem, to connect spk, power switch, power led, hdd light etc. PLEASE can I have a photo of motherboard SL-75KAV? Dražen

A primary and secondary usually refers to a transformer. The primary side being the input side 110 AC Volt or 220 Volt AC side. Also called Source.
The Secondary being the "output to load" side 12 Volts "for example". And also called Tap (Secondary Tap)

The voltage is changed by conduction, magnetic flux, neither side touching one another. And the number of turns of wire, per side, determine the voltage. The voltage may either be a step-down or Step-up depending on its use.
An unconventional method is to have both the primary & secondary combined into a single tapped winding - which arrangement is called an autotransformer. The autotransformer does not provide isolation between primary and secondary circuits but its simplicity makes it economical and space-saving.
Imagine a single wire wrapped from the top to the bottom being the primary, and tapping in. in the middle and bottom for the secondary, so the output becomes 1/2. That would be a step-down transformer.

The actual measurement of a transformer is measured by its efficiency (Faraday Law) which is defined as a ratio of power. I hope that's sufficient, but if you want more I would buy for $2 bucks an Electricity Made Simple Book, because there are pages after pages to write about transformers, and to understand electricity in general it is helpful to understand the difference between alternating current and direct current and its magnetic field of induction and magnitude of emf.

http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

I don't think they post schematic for the transformer
But generally, the primary coil receives 120Volt AC input from household electrical outlet
And the secondary coil produces 12Volt AC output for the low voltage lights.
The 'coil' is a coil of insulated wire wrapped around a metal core. Two coils set side by side create a transformer... when primary is energized, the secondary responds to the magnetic field caused by primary core... resulting in a current that flows on the secondary coil.
Output voltage on secondary coil is determined by the number of wraps and diameter of wire.

Some transformers offer a choice of secondary output... Kichler for example... you can select 12-13-14-15 Volt AC output
This is achieved by the way the secondary coil is wrapped.... for less voltage a wire is tapped at one point on the coil... for more voltage, a wire is tapped at another point on coil. This gives the user several wire choices to connect the lights.

Gene

there is no diffrence between primary & third ide hdd ,if you install nay booteble hdd in master so system try to from that frist . boot sequence of motherboard is try to boot from primary master first then Primary slave then secondary master and then master secondary ..................,

First connect the SATA to port 0 Sata does not have any Primary or secondary port, It has ports SATA0,SATA1,SATA 2, 3 and 4(depending upon the number of ports available on your motherboard), Connect the SATA to port SATA0

Then connect another Drive to IDE 2(secondary). Normally the IDE port closer to the RAM is primary.

To confirm the connection is correct you can look in the BIOS


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please my name is dele i have this BOSE radio/cd system model number is AWRC2G which transformer burnt out rightly, that the input is 240volts which output is the problem and in nigria. please i just want to know the output on each coloured wire of the secondary that has 8 wires output from the secondary (2 purple - brn = volt, 2 blue = volts, and 2 black - gray = volts. so that similar that i can use to work it.
thank you

If the drive is set as Cable Select you are allowing the motherboard to detect where it is on the ribbon cable. If the drive is shown as Primary slave then the drive is on the wrong connector on the ribbon cable. If it is shown as secondary master than the IDE cables on the board need to be switched (primary to secondary, secondary to primary)

link for pdf file
outer ide channel is secondary the one above is primary.
as xp and vista doesn't matter which ide channel everything is connected, it will still look for bootable source.

Normally attach hard drives to primary and cdrom/dvd to secondary.

many new motherboard does not recognize slave mode on if single ide drive connect
verify both drive set is master or not after that you attach to primary your harddrive and secondary cdrom

your reset problem is wirering connection see your motherboard manual