The KB-303 is nearly the same as the KB-300. It was not an attempt
to make a more bass orientated machine, as the name might suggest due to
it's similarities to Roland's famous (or infamous!) TB-303. The service
manual gives the following table as the major differences from the KB-300:
| KB-300 | KB-303 | |
| Cabinet | Black and white plastic case | The external appearance has been changed and the case is black plastic |
| AC power supply | Built-in type | Supplied AC adaptor |
| Power cord | Supplied | None |
| Owner's manual | Book type | Folded sheet type |
| Song book | Supplied | None |
Other differences that I know of are:
Weight: 5.8 kg / 12.8 lb (without batteries)
Dimensions: 860(w) x 288(d) x 103(h) mm
Power Consumption: 12 W (with battery) / 14 W (with AC)
Other than that it is assumed infomation that appears on the KB-300 page also applies to the KB-303.
The KB series all seem to have a suffix of either B, N or H. The
303 had an A model as well though. The only difference is the AC
adapter the model uses as shown is the table below. I assume the
difference between B and H is 50Hz and 60Hz versions.
| Type | AC adapter model no. | Voltage |
| KB-303B | KB-A10B | 240V |
| KB-303H | KB-A10H | 240V |
| KB-303N | KB-A10N | 220V |
| KB-303A | KB-A10A | 127 / 220V |
Pictures
