Fujitsu Denso LPS-3 (8736-D961)/(8736-D962)

The Fujitsu Denso LPS-3 (8736-D961) is an industrial switching power supply designed for use in professional imaging systems, most notably Fujifilm Frontier minilabs. Manufactured in Japan in 1999, the unit delivers stable high-current DC output for lamp assemblies and precision imaging hardware.

Built to industrial standards, the LPS-3 combines robust transformer-isolated SMPS architecture with active regulation and protection circuitry, ensuring reliable operation in high-duty commercial lab environments.

Key Specifications

Model: LPS-3

Part number: 8736-D961

Manufacturer: Fujitsu Denso Ltd., Japan

Year: 1999+

Input

• 200–240 V AC

• 50/60 Hz

• 3.4 A

Output

• +36 V DC

• 12 A (max)

Designed primarily to power Frontier lamp systems.

Design & Architecture

The LPS-3 uses a classic late-1990s Japanese switch-mode power supply (SMPS) design featuring:

• EMI filtering and surge protection

• bridge rectification with bulk storage

• high-frequency transformer isolation

• PWM regulation control

• multi-stage output filtering

This architecture provides:

stable regulation under load

low ripple

efficient thermal performance

ideal for precision imaging workflows.

Functional Controls (external markings)

The enclosure provides adjustment and diagnostic access:

• OUT ADJ – fine voltage adjustment

• UP ADJ / DOWN ADJ – regulation trim

• LAMP UP / DOWN – lamp drive indication

• OVER CURRENT – protection status

typical of service-oriented lab hardware.

Typical Applications

The LPS-3 was designed for:

• Fujifilm Frontier scanners/minilabs

• lamp house power regulation

• industrial imaging systems

not intended for consumer use.

Build Quality

Typical characteristics:

• heavy steel enclosure

• large toroidal filtering stages

• industrial capacitors

• conservative thermal design

reflects late-90s Japanese industrial engineering standards.

Historical Context

The LPS-3 represents the generation of highly specialized OEM power supplies developed for professional minilabs during the peak of hybrid film-digital workflows.

Unlike generic supplies, these units were:

• custom-built

• rarely documented publicly

• serviced by replacement rather than repair

making surviving examples increasingly rare.