ACU-RITE D200 DRO

ACU-RITE 2x Mill D200

Overview

Glass scale based digital read out (DRO). It uses a vacuum fluorescent display (VFD) rather than a more modern LED displays.

2X MILL D200  DOM
PN: 2001003
SN: 99050879 Rev: B

Photos

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Taken from eBay seller lovedabeach's eBay Item #122087858728.

Replacement Parts

Power Entry Module

TE Connectivity Corcom Filters PS0SXS000

Transformer

ENSIGN CORPORATION
2001-900 B
172.9911

172 is the manufacturer code (Acu-Rite or Ensign?) 9911 is the date code, November 1999. B is the revision level.

Specs:

• Input Power: 115/230VAC ± 20% @ 50/60Hz
• Output #1: 7V minimum ripple valley @ 1.4ADC / 47000uF (± 20%) capacitor with 80% nominal input (92VAC instead of 115VAC), 15V ripple peak @ 450mA with 120% (138VAC instead of 115VAC) input.
• Output #2: 34V minimum @ 115mA DC / 1000uF (± 20%) capacitor with 80% nominal input, no maximum specified.
• typical forward diode drop is expected to be 1V
• thermal fuse on each secondary, if it blows it's permanent.
• external fusing, 0.5A slow blow for 115V operation, 0.25A slow blow for 230V operation.

Transformer pinout:

The bobbin manufacturer and Acu-Rite use different pin mappings. On the bobbin, pin #1 is marked by a notch in the plastic, that pin is also closer to it's adjacent pin than the rest. The bobbin pin numbers are numbered 1-6 then 7-12 clockwise (TODO: from above or below?). In other words, bobbin pins 6 and 7 are across from each other at the same end of the transformer.

Bobbin Pin	Acu-Rite Pin	Function
1	[NC]	[NC]
2	1	Primary #1 A
3	2	Primary #1 B
4	3	Primary #2 A
5	4	Primary #2 B
6	[NC]	[NC]
7	5	>34V out
8	6	>34V out
9	[NC]	[NC]
10	[NC]	[NC]
11	7	7-15V out
12	8	7-15V out

• For 115V operation, jumper Primary #1A to Primary #2A as well as Primary #1B to Primary #2B. This puts the primaries in parallel.
• For 230V operation, jumper Primary #1B to Primary #2A. This puts the primaries in series.

2x Logic Board

Name	Markings
U1	Allegro UCN5818EPF
U2	Fairchild 74VHC138
U3	AMD Am188 EM-20KC
U4	Microchip 93AA66/SN
U5	Fairchild 74VHCT573
U6	ISSI IS62C256-70U
U7	National Semiconductor 74VHCT74
U8	AMI 9851NTF ACU-RITE 387577-702 REV-B
U9, U10	Motorola VHC574
U11	unknown, sticker reads "DRO 1.1.2" (ROM?)
U12	Fairchild 74VHC123A

VFDs

Top

Noritake CH1573G

8-digit 14-segment display with periods. The last (right-most) segment has a dot in the center of the top "circle" in the 8. There are also words above each digit to indicate modes.

Bottom

Noritake CH1572G

8-digit 7-segment display with periods and split center segments. The last (right-most) segment has a dot in the center of the top "circle" in the 8.

Online Resources

Acu-Rite DRO 200M Brochure

Acu-Rite DRO 200M Reference Manual

Manuals & Flyers – ACU-RITE

Technical Support – ACU-RITE

Service: Helpline - HEIDENHAIN

ACU-RITE DRO 200M | Digital Readout Systems

Acu-rite Digital Readout Repair Page