Servicing NeXT (Canon) MO Drives

Started by korneluk, June 28, 2007, 06:27:00 pm

Previous topic - Next topic

Khashoggi

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.

NeXTnewbe


pergamon


Khashoggi

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

pentium

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

Khashoggi

Quote from: "pentium"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.

Khashoggi

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?

gtnicol

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.

Khashoggi

Quote from: "gtnicol"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.

Khashoggi

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)

Khashoggi

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.

IC's
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

Khashoggi

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 :D that would save some time. I have started drawing some schematics for the analog board to correlate the pots with the opamps.

tomaz

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

t-rexky

Quote from: "tomaz"
Quote from: "Khashoggi"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.

gtnicol

Quote from: "t-rexky"
Quote from: "tomaz"
Quote from: "Khashoggi"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...