I can't recall if the VCR timer still works on these STBs. If it's possible to still set timers on the E940, you could simply set an additional timer on the VCR/PVR for the same time period on L1 (or whatever input you're using, Ch3?) on the VCR/PVR. If you have weekly timers, you only need to set them once on each device. Of course single recordings would need to be set up each time on both devices.
Very few people still use VCRs, most having switched to Rogers PVRs and HD picture quality. VCRs are kludgy and only SD.
Regarding the operating manual, you could try searching the Cisco/SA websites for a manual, however, the firmware for each service provider is different, so Rogers might be different from what you find on the manufacturer's website. Many years ago, very few people had luck with VCRs and blasters, but the dual timer technique that I mentioned earlier does work.