Power Supplies

For FCC info click here.

Letting out the magic smoke

I have seen many eBay listing stating something like the following:

• "Was testing this and it randomly shorted out."
• "Plugged it in seemed to work then it went Pop and didn't work anymore."

One time I even saw this picture:

99% of the time it is likely that the RIFA filtering caps blew in your machine. This is very likely if the machine has not been serviced in a long time. Use this page and my notes on RIFA caps to address this problem.

Mounting Notes

The earliest Kaypro Power Supplies were mounted with the connector on the left side as you look from the front or upside down to most of us. At somewhere between #4222 and #7954 the board was flipped so that the connector was on the right side.

Left verses Right Connectors

#4222 and Earlier	#7954

Harness Notes

The wiring harness on the very early machines appears to have all white wires on the 10 (or 9) pin connector. This appears on the #2767 and #2775, but my #3590 has black, white, red and green wires as does every later machine does.

#2767 Photo From Thomas Brase	#2775	#3590

Cal DC

Cal DC LR5301-03 "Blue"
In my earliest Kaypros I have the blue board CalDC boards
	No RIFAs on these boards Ceremaic Disk Capacitors provide EMI Filtering C1 has 2 0.1microFarad Z caps 500V C2 and C3 are 2200 picoFarad 3000V Y5U C4 has a single cap that matches those in C1
	#2775 - 037085 #3590 - 039421 #4207 - 040864 #4222 - 040858
Cal DC LR5301-03 "Clear" (Note that there is a slightly different board layout)
	Early ones have ceramic caps in C2-4 #21460 has 2 2200pF Ys (C2 and C3) (Lead space requires bending leads) and 0.22microF X2 (C4)
	#12654 - 48859 #15453 - 50863 #21460 - 53810
Cal DC LR5301-15 Labeled on Transformer Note:65W
Cal DC LR5301-15 Labeled on Capacitor Note:85W
	#288536 - 9003067

From the Tech Manual for switching to 220V: Identified by a bright blue circuit board. A white sticker with "California DC", model, and serial number is located on solder side of board.
There are two ceramic power resistors in the upper right-hand corner of the board. These resistors get quite hot during operation. Wiring should be tied down AWAY FROM THESE COMPONENTS.
Locate a jumper block labelled 115VAC and 230VAC. With the jumper in the 115VAC position the board is configured for 110V.
Remove the jumper from the socket labelled 115 VAC and replace it in the socket labelled 230VAC. The power supply is now configured for 220V use.

Boschert

Boschert XL53.3101R "Clear"
		#8409 - MBO 9876 (82/43) #12275 - MBO 3773 (82/48)
Boschert XL53.3601R "Green"
		#7954 - HL 2676 (83/09) #16288 - HH 0074 (82/49) #17083 - HH 0856 (82/51) #20250 - HH 3369 (83/01)
For Both Boschert XL53.3101R & XL53.3601R
	Original RIFA Caps: 1-0.22 microFarad X and 3-4700 picoFarad X (both 250V) I would suggest replacing the 4700 picoFarad X Caps with Y2 for safety reasons
Boschert XL60.3601R

From the Tech Manual for switching to 220V: Identified by the word "Boschert" on the component side of the board at lower right and above the fuse and capacitor C2. Locate a six-inch wire that is soldered to point JP1. If the board is configured for 110V, the other end of the wire is attached to point E1 (labelled 110V). Unplug the wire from point E1 and plug it into E2 (labelled 220V). Point E2 is to the left of point E1. The power supply is now configured for 220V use.

Astec

Astec AA 12350

	C13 - 0.01microF (Lead Spacing 1.45/1.21) C-G C1 - 0.01microF (Lead Spacing 1.45/1.78/2.08) N-L C2 - 0.1microF (Lead Spacing 1.45/1.78/2.08) PT N-L	#57145

Appears to be related to the Astec AA12090 for an TRS-80

Astec AA 12450

	C2 - 0.1microF (Lead Spacing 1.45/1.78/2.08) PT N-L C1 - 0.01microF (Lead Spacing 1.45/1.78/2.08) N-L C13 - 0.01microF (Lead Spacing 1.45/1.21) C-G
			Note the change in position for the one cap of the 4 on the right side.

From the Tech Manual for switching to 220V: