Nanao MS9

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Schematic Page 1

Schematic Page 2

Pots on MS9 chassis

Input pinout

Nanao MS-9 capacitor listing

What types of CRT tube are used with the MS9?

The MS9 can have the following CRTs:

A68KJU96X (Toshiba)
A68KSA30X (Hitachi)
M68JUA068X (Matsushita)

A number followed by a letter between brackets on the label of Toshiba CRTs is the date of manufacture (4D = April 1994, 6H = August 1996, etc.) and is not part of the CRT designation.

Remote Board Potentiometers

VR283 - Contrast: 5k
VR280 - R Gain: 3.3k
VR281 - G-Gain: 3.3k
VR282 - B-Gain: 3.3k
VR284 - B-Gain: 3.3k
VR285 - H.Size: 10k
VR286 - H.Posi: 10k
VR287 - V.Size: 10k
VR288 - V.Posi: 10k

5K Pot: https://www.digikey.com/en/products/detail/PTV09A-4015F-B502/PTV09A-4015F-B502-ND/3781115 - Bourns Inc PTV09A-4015F-B502
10K Pot: https://www.digikey.com/en/products/detail/bourns-inc/PTV09A-4015F-B103/3781113 - Bourns Inc PTV09A-4015F-B103
3.3K Pots: Try Aliexpress or Amazon (look for "332" Potentiometers)

Thanks to ekorz & Arcade-Projects forum members for the research. (Archive of the original)