PC-9821N-U01

PC9821N-U01 Power Supply

Preliminary Information
Release Year	199X
Leak Risk	Medium
Batteries	None
Mounting Technology	Through Hole
Capacitor Types	Aluminum Electrolytic, Ceramic, Polymer
Destructive Entry	No
Power Requirements
Input Voltage	100V AC

Power supply for multiple PC-9821 ノート (notebook) computers.

Known Issues

Computer won't power on, sometimes LEDs flash for a moment.

Causes

• Leaking capacitors

Solutions

• Clean PCB and replace capacitors

Disassembly Notes

There is a screw hidden under the label. Note that it is a Japanese screw, so if you don't have Japanese screwdrivers be careful not to strip it with a Philips head.

After removing the screw the sides are clipped together.

Once inside the PSU is surrounded by a metal shield and plastic insulation. Desolder the metal part from the PCB, and remove the nut and screw for the heatsink. It will then slide off.

Original Parts

Tonkin PCB

File:PXL 20250315 212652873.jpg

PCB underside

File:PXL 20250315 212721073.jpg

Capacitors 1

Capacitor Specifications and Footprint Information

RefDes	Qty	Capacitance	Voltage	Mount	Diameter/Size	Height	Lead Spacing	Temp	Type	Brand	Series
C7	1	270 µF	200 WV	Snap In	22mm	25mm	10mm	105 °C	Electrolytic	Nichicon	GQ (M)
C11	1	33 µF	35V	TH radial	5mm	12mm	2.54mm	105 °C	Electrolytic	Nichicon	CE-DF
C201	1	33 µF	35V	TH radial	5mm	12mm	2.54mm	105 °C	Electrolytic	Nichicon	VZ (M)
C208, unlabelled below it	2	1 µF	50V	TH radial	5mm	11mm	2.54mm	105 °C	Electrolytic	KME
C102, C103, C104, C105	4	330 µF	25V	TH radial	8mm	20mm	3.5mm	105 °C	Electrolytic	Nichicon	PL (M)

Replacement Parts

Tonkin PCB

Capacitors

RefDes	Qty	Compatible Part Number	Order Links
			Digikey

If parts are not available or different selection is preferred, you can use the values in the Original Parts section to perform a parametric search.

Kits

• None

Related Links

• None