I have scanned the manual for these projectors.
Even though the scan is low resolution, the file size
is very large.
It will take about 15 minutes on a 56 K modem.
Download B&H 25xx manual in PDF format (2.98 MB)
For personal use only, not for redistribution.
The schematics below for the Bell and Howell model 1552 are typical
of all of the 1500 and 2500 series.
Amplifier schematic for Bell and Howell 1552:
bhampsch.pdf
Projector schematic for Bell and Howell 1552:
bhprosch.pdf
How to replace the belt on a B&H 1500 - 2500 series projector