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You can download a copy of the manual from here. You might also want to check out some local public libraries and/or used book stores. Some of them might have some older photography books dealing with 35mm cameras.
Many flashguns deigned for film cameras - even really expensive ones - will not work with DSLRs.
I have a perfectly good pentax gun that cost me almost £300. It is fanstastic on my TOTR Pentax SLR but will only blat at maximum power on my Pentax DSLR. I had to spend another almost £300 to buy the new gun that will work with all the bells and whistles on my DSLR.
It looks as though Canon work theirs the same way.
The brands use the flash contacts to communicate to the camera. They do not make their flashes compatible with other brands. Don't mix brands. Even if trigger voltageis not an issue, the TTL and AF is not going to function.
When using a digital camera with a flash unit of unknown trigger voltage, you are risking the life of your camera. Excessive trigger voltages can disable the cameras internal circuitry to the point where it is totally beyond repair.
I do not have, in my files. the trigger voltage for the specified flash unit. I only have the specs for larger portables and studio flash gear.
A simple test , however, will reveal the exact trigger voltage. If you have a multi-meter or a DV voltmeter with a 250 VDC range (just to be in the safe side) you can preform this test at home or an electronics service technician can do it for you in a few minutes.
The test lead are placed across the synch contacts on the foot of the unit or plugged into the sunch socket if the flash unit has one. If the reading is more that 4 or 5 volts you can still safely use the flash with the aid of a protector device which goes in between the flash and the camera. Theses are available at better camera shops and dealers.