How easy is it to replace an intermatic ML300RTW malibu tranformer?

Following link shows photocell switch for ML300 series power pack
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html#wire

Gene

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Try the transformer on different outlet.
Move wires inside breaker box to different circuit breaker.
Check is breaker is loose, or makes crackling sound.
Copy following links for resources:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html
http://waterheatertimer.org/pdf/How-to-find-ground-fault-in-household-electric-circuit.pdf

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Copy following link for instructions and tips:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html
http://waterheatertimer.org/Intermatic-timers-and-manuals.html
http://waterheatertimer.org/How-to-set-timers.html

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Open following link for troubleshoot steps that give full rundown for setting timer plus replacement trippers, wiring, warranty, and tips for protecting power pack:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

ML300RTW instruction manual:
http://www.intermatic.com/~/media/files/intermatic/products/instructions/professional%20lighting/ml300rtw.ashx

http://www.intermatic.com/products/professional%20lighting/low%20voltage%20landscape%20products/power%20packs.aspx

Yes power pack has override, depending on model.
There should be a small knob located above and to left of dial that rotates: Step 8 in Manual says: You can manually operate the lights by turning the Manual ON/OFF Switch counter clockwise.
http://www.intermatic.com/~/media/files/intermatic/products/instructions/professional%20lighting/ml300rtw%20ml300rtwsn%20trilingual.ashx

For information on Intermatic/Malibu power packs showing links to manuals, troubleshoot steps, replacement trippers, useful links, warranties and tips:
http://waterheatertimer.org/Malibu-power-pack-stopped-working.html

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could it actually be :ML300RTW Here is a link to the manual.
http://www.intermatic.com/~/media/files/intermatic/products/instructions/professional%20lighting/ml300rtw%20ml300rtwsn%20trilingual.ashx

If that direct link doesn't work go to www.intermatic.com and put the ML300RTW in the search box.

http://www.malibulights.com/Customer%20Service/OwnersList.aspx?category=Low+Voltage+Lighting
Here's the link to the Malibu owner's manual page.

Here's the manual:
http://www.retrevo.com/support/Intermatic-ML300RTW-manual/id/22966ci062/t/2/

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You posted under Intermatic/Malibu power packs:

For information on Intermatic/Malibu power packs showing troubleshoot steps, replacement trippers, useful links, warranties and tips:
http://www.fixya.com/support/r8391011-power_pack_not_working

I discovered that I hadn't turned the manual switch to off on the one that wasn't working properly.
Now they both work fine. The instructions that come with the Malibu Transformer is not easy to understand and it does not go into enough detail. There isn't a trouble shooting section which would help.