This Japanese owner's manual covers the Yamaha A350, A250, and A150 series power amplifiers. It explains the front and rear panel controls, input and output terminals, STEREO and BRIDGE modes, speaker impedance, and speaker wiring.
The manual also includes usage precautions, mounting in a movable case, troubleshooting, general specifications for the A350, A250, and A150, a block diagram, dimensions, and characteristic diagrams. This manual is written in Japanese.
| Power requirement | AC 100 V, 50 Hz or 60 Hz (Japan domestic specification) |
|---|---|
| Operating modes | STEREO and BRIDGE |
| Minimum speaker impedance in STEREO mode | 4 Ω per channel |
The amplifiers offer STEREO mode, in which channels A and B operate independently, and BRIDGE mode, in which the unit works as a single mono amplifier.
It shows that the protection circuit is operating; during this time the amplifier is disconnected from the speakers and no sound is output.
The unit is for Japan domestic use and must be connected to an AC 100 V, 50 Hz or 60 Hz outlet.
The manual shows a minimum impedance of 4 Ω for each channel in STEREO mode.