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Servicing NeXT (Canon) MO Drives
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Wed Sep 04, 2013 1:24 am    Post subject: Reply with quote

ANALOG BOARD

C221 10uf@16v 105c 4x6 (0.20uf)
C281 1uf@50v 105c 4x6 (none)
C369 3.3uf@50v 105c 5x6 (0.18uf)
C244 1uf@50v 105c 4x6 (none)
C364 22uf@16v 105c 5x6 (0.83uf)
C365 22uf@16v 105c 5x6 (none)
C277 47uf@16v 105c 6.5x6 (0.67uf)
C279 47uf@16v 105c 6.5x6 (0.01uf)
C306 3.3uf@50v 105c 5x6 (0.86uf)
C303 47uf@16v 105c 6.5x6 (0.86uf)
C352 47uf@16v 105c 6.5x6 (51uf)
C353 47uf@16v 105c 6.5x6 (none)
C354 47uf@16v 105c 6.5x6 (47uf) w/paper insulator through leads to nearby resistor
C355 47uf@16v 105c 6.5x6 (none)
C266 10uf@16v 105c 4x6 (none)
C269 10uf@16v 105c 4x6 (none)

DIGITAL BOARD

C447 10uf@16v 105c 4x6 (0.02uf)
C448 10uf@16v 105c 4x6 (0.48uf)
C433 10uf@16v 105c 4x6 (none)
C477 10uf@16v 105c 4x6 (none)
C421 10uf@16v 105c 4x6 (none)

MOTOR BOARD

C3 2.2uf@50v 105C 4x6 (0.33uf)
C6 10uf@35v 105C 5x6 (0.02UF)
C7 10uf@35v 105C 5x6 (8.8uf)
C8 10uf@35v 105C 5x6 (0.23uf)
C9 10uf@16V 105C 4x6 (0.18uf)
C2 1UF@50V 105C 4x6 (0.5uf)
C4 10uf@35V 105C 5x6 (7.6uf)
C5 10uf@35V 105C 5x6 (none)



diameterxlength in mm


It is quite obvious there is a major cap failure due to age & environment. I will replace all of them and then report back.
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NeXTnewbe



Joined: 27 Oct 2006
Posts: 286
Location: UK

PostPosted: Wed Sep 04, 2013 3:29 am    Post subject: Reply with quote

the best of luck
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pergamon



Joined: 30 Dec 2005
Posts: 222
Location: Indiana

PostPosted: Wed Sep 04, 2013 6:51 am    Post subject: Reply with quote

You are our only hope!
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Wed Sep 04, 2013 8:16 am    Post subject: Reply with quote

Bill of materials for complete Electrolytic Capacitor replacement on all MO PCB's through Mouser-

Mouser #: 667-EEA-GA1V100

Mfr. #: EEA-GA1V100
Manufacturer: Panasonic
Desc.: Aluminum Electrolytic Capacitors - 10uf 35v Leaded Al Lytic Cap 105C Radial GA Series
RoHS: RoHS Compliant



Availability
5 Ships Now
$0.25 $1.25

Mouser #: 667-EEA-GA1H2R2

Mfr. #: EEA-GA1H2R2
Manufacturer: Panasonic
Desc.: Aluminum Electrolytic Capacitors - Leaded 50volts 2.2uF 4X7mm L/S=1.5mm Bulk
RoHS: RoHS Compliant



Availability
1 Ships Now
$0.22 $0.22

Mouser #: 667-EEA-GA1C470

Mfr. #: EEA-GA1C470
Manufacturer: Panasonic
Desc.: Aluminum Electrolytic Capacitors - Leaded 16volts 47uF 6.3X7mm L/S=2.5mm Bulk
RoHS: RoHS Compliant



Availability
7 Ships Now
$0.31 $2.17

Mouser #: 667-EEA-GA1C220

Mfr. #: EEA-GA1C220
Manufacturer: Panasonic
Desc.: Aluminum Electrolytic Capacitors - Leaded 16volts 22uF 5X7mm L/S=2.0mm Bulk
RoHS: RoHS Compliant



Availability
2 Ships Now
$0.25 $0.50

Mouser #: 667-EEA-GA1H1R0B

Mfr. #: EEA-GA1H1R0B
Manufacturer: Panasonic
Desc.: Aluminum Electrolytic Capacitors - Leaded 50volts 1.0uF 4X7mm L/S=5.0mm Ammo Crmp
RoHS: RoHS Compliant



Availability
3 Ships Now
$0.22 $0.66

Mouser #: 667-EEA-GA1C100

Mfr. #: EEA-GA1C100
Manufacturer: Panasonic
Desc.: Aluminum Electrolytic Capacitors - Leaded 16volts 10uF 4X7mm L/S=1.5mm Bulk
RoHS: RoHS Compliant



Availability
9 Ships Now
$0.22 $1.98

Mouser #: 140-MLNP50V3.3-RC

Mfr. #: 140-MLNP50V3.3-RC
Manufacturer: Xicon
Desc.: Aluminum Electrolytic Capacitors - Leaded 4X7MM 50V 3.3uF NP
RoHS: RoHS Compliant
Info: View Additional Product Info

Availability
2 Ships Now


Last edited by Khashoggi on Wed Sep 04, 2013 9:04 am; edited 4 times in total
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pentium



Joined: 23 Jun 2006
Posts: 1159
Location: Kamloops, BC

PostPosted: Wed Sep 04, 2013 8:41 am    Post subject: Reply with quote

Fingers are crossed.
This works and one of the greatest mysteries in NeXT history has been solved.
_________________

-NeXT 68040 Cube with NS 3.3 and 64Mb ram
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Wed Sep 04, 2013 9:41 am    Post subject: Reply with quote

pentium wrote:
Fingers are crossed.
This works and one of the greatest mysteries in NeXT history has been solved.


I am targeting bad caps and bad solder joints. I will setup a drive with PCB's exposed on a test board so that I can run the drive off bench power while testing the mechanism for ingest, spin up, and seek.

Once I get to that point it will be off to a real NeXT to see if it will read and write.

I doubt I can tackle bad lasers or bad tracking element, but hopefully those are the minority problems in these units.

At some point if I can get one working I'm going to use an oscilloscope to make test measurements around the calibration pots to establish some calibration points. Putting in fresh caps may still require a re-cal. I may need to source a known good unit to take the measurements. We shall see.
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Wed Sep 04, 2013 11:23 am    Post subject: Reply with quote

I will attempt to develop a calibration procedure. These are the relevant areas of interest-

Analog board-

Pots-
vr220
vr217
vr230
vr203
vr204
vr206
vr207
vr211
vr205
vr202
vr213
vr209

Test points- TOP
PG

Test points- BOTTOM
LP-D
AF-EA GC
SUM
AF-E
AT-E
AT-EH
AT-D
AF-D

VOLTAGE REGULATORS
Q254 - 78M05 +5V@0.5A
Q255 - AN79N05 -5V@1.0A

HYBRID SUB-MODULE
40 PIN
E91964 340

Anyone know what the Hybrid module is for E91964 340?
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gtnicol



Joined: 27 Dec 2005
Posts: 531
Location: Rhode Island, USA

PostPosted: Wed Sep 04, 2013 11:40 am    Post subject: Reply with quote

I would be willing to send you a WORKING drive for comparison, and some other goodies. I have been able to get a half dozen drives working mostly by reflowing solder and replacing a few caps, but I think I am the exception.

It would be good to get to the bottom of this for sure.
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Wed Sep 04, 2013 8:35 pm    Post subject: Reply with quote

gtnicol wrote:
I would be willing to send you a WORKING drive for comparison, and some other goodies. I have been able to get a half dozen drives working mostly by reflowing solder and replacing a few caps, but I think I am the exception.

It would be good to get to the bottom of this for sure.


That would be great! Getting the readings from the test points and the pots, on a known-good drive, would be invaluable in developing a calibration procedure. I will PM you the info.
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Wed Sep 04, 2013 8:40 pm    Post subject: Reply with quote

Some more data from the Analog board while I wait for the replacement caps to arrive. Measured value was in-circuit so not definitive.

Analog board-

Pots-
ID part# range ohms (measured set value)
vr220 502/9 5K (2.82K)
vr217 103/6 10K (4.80K)
vr230 202/5 2K (0.979K)
vr203 203/5 20K (8.00K)
vr204 203/5 20K (9.28K)
vr206 203/5 20K (5.42K)
vr207 203/5 20K (8.24K)
vr211 203/5 20K (8.88K)
vr205 104/? 100K (18.14K)
vr202 104/? 100K (74.23K)
vr213 202/5 2K (1.08K)
vr209 203/5 20K (9.37K)

Test points- TOP
PG

Test points- BOTTOM
LP-D J204-pin 4
AF-EA GC
SUM J201-pin 7
AF-E J201-pin 6
AT-E J201-pin 5
AT-EH
AT-D
AF-D

Board connectors
J204 (40 pin)
J205 (34 pin)

J201 (28 pin)
J202 (10 pin)
J203 (5 pin)
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Thu Sep 05, 2013 12:51 pm    Post subject: Reply with quote

Analog board IC's are primarily opamps, some comparators and some 4066 quad switches. Nothing proprietary. No micro-controllers etc. Straightforward design.

I will decode which pots affect which opamps. Doing that will make it easier to take oscilloscope measurements.

ICís
ID Chip part Decoded part
Q241 D4066G? (spic-14) CD4066 Quad switch
Q231 358-936? (soic- 8) uPC358 Dual opamp
Q242 358-936 (soic- 8) uPC358 Dual opamp
Q300 358-936 (soic- 8) uPC358 Dual opamp
Q202 074-JRC-A9005B (soic-14) tl074 Quad opamp
Q216 D4066G (soic-14) CD4066 Quad switch
Q204 074-JRC-A9005B (soic-14) tl074 Quad opamp
Q206 074-JRC-A9005B (soic-14) tl074 Quad opamp
Q205 074-JRC-A9005B (soic-14) tl074 Quad opamp
Q219 D4066G (soic-14) CD4066 Quad switch
Q208 C324G-8934M (soic-14) uPC324 Quad opamp
Q207 074-JRC-A9005B (soic-14) tl074 Quad opamp
Q215 393-91?(2/3) (soic- 8) uPC393 Dual comparator
Q210 074-JRC-A9005B (soic-14) tl074 Quad opamp
Q209 C4741G-8827F (soic-14) uPC4741 Quad opamp
Q214 C339G-8936H (soic-14) uPC339 Quad comparator
Q230 1093-920 (soic- 8) uPC1093 Regulator adjustable
Q211 C4741G-8827F (soic-14) uPC4741 Quad opamp
Q212 C324G-8934M (soic-14) uPC324 Quad opamp
Q213 C339G-8936H (soic-14) uPC339 Quad comparator
Q218 D4066G (soic-14) CD4066 Quad switch
Q217 D4066G (soic-14) CD4066 Quad switch
Q270 D4066G (soic-14) CD4066 Quad switch
Q224 74LS07 (soic-14) 74LS07 Hex buffer
Q222 4560-914 (soic- 8) uPC4560 Dual opamp
Q220 C4074G-8828E (soic-14) uPC4074 Quad opamp
Q221 4560-914 (soic- 8) uPC4560 Dual opamp
Q275 HC00-8908X7 (soic-14) 74HC00 Quad 2-in NAND
Q24? 74LS07 (soic-14) 74LS07 Hex buffer
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Khashoggi



Joined: 03 Nov 2011
Posts: 180

PostPosted: Thu Sep 05, 2013 8:23 pm    Post subject: Reply with quote

I want the pinout on the MO drive connector on the cube. I figured the schematics would be here somewhere, but alas the only schematics I can find are of the turbo cube, which of course doesn't have a MO connector!

Anyone know where I can find the MO drive interface pinout or the schematics for the original 030 or 040 cube?

Oh, and while were at it anyone know the whereabouts for the schematics of the MO drive itself Very Happy that would save some time. I have started drawing some schematics for the analog board to correlate the pots with the opamps.
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tomaz



Joined: 15 Apr 2006
Posts: 150
Location: Sark

PostPosted: Fri Sep 06, 2013 12:41 pm    Post subject: Reply with quote

Khashoggi wrote:
anyone know the whereabouts for the schematics of the MO drive itself
I think this is a 64 million $ question!
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t-rexky



Joined: 09 Jan 2011
Posts: 285
Location: Snowy Canada

PostPosted: Fri Sep 06, 2013 3:16 pm    Post subject: Reply with quote

tomaz wrote:
Khashoggi wrote:
anyone know the whereabouts for the schematics of the MO drive itself
I think this is a 64 million $ question!


For what it is worth, I would suggest trying to reach someone who cares at Canon. Usually VP level and up induces some response in my experience, but not always.
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gtnicol



Joined: 27 Dec 2005
Posts: 531
Location: Rhode Island, USA

PostPosted: Fri Sep 06, 2013 6:12 pm    Post subject: Reply with quote

t-rexky wrote:
tomaz wrote:
Khashoggi wrote:
anyone know the whereabouts for the schematics of the MO drive itself
I think this is a 64 million $ question!


For what it is worth, I would suggest trying to reach someone who cares at Canon. Usually VP level and up induces some response in my experience, but not always.


I hope you'd have better luck than I did... I tried every which way but got nothing...
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