Capcom QSound Amplifier

Variants

There are 2 known variants of the QSound amplifier, both share the same reference CPB-001A, which can be confusing.

• The first revision is used in Capcom Q GrandAm 25 and US "Big Blue"cabinet and needs 14VAC to work properly.
  
• The second revision is used in Capcom Impress and has been modified to work with 12VDC and therefore doesn't need an AC transformer to work.
  

• 
  Original Amp (14VAC)
• 
  Impress Amp (12VDC)

Transformers

First revision QSound amps originally come with either of the following AC transformers :

• CPT-002B Kitamura Kiden, only accepts 100VAC (Black Wire) or 120VAC (Gray Wire) inputs.
• CPT-003A Kitamura Kiden, only accepts 220VAC (Blue Wire) or 240VAC (Violet Wire) inputs.

Connectors

Uses JST VHR-3M/JST VHR-3N (power) and JST VHR-4M/JST VHR-4N (speaker out) connectors.
The matching contact is SVH-41T-P1.1
JST VH connectors

Line Level Attenuation

The Amp was designed to be run with hardware that controlled the volume (CPS2, ZN...) Because of this, the Amp does not have a volume pot and does not like receiving from devices outputting standard 'Line Level' audio.(basically like plugging in a device with volume turned up to max)
Passive attenuators can be used in order to bring the level down.
Some attenuators are adjustable (pictured) which can help in choosing the most suitable attenuation if different sources are being connected.

Pictures

• 
  Original amp component side
• 
  Original amp solder side
• 
  Original amp side view