SE/30 REPAIR

Back to Home Page 03/17/03 rev 06/15/03 SE/30 REPAIRDownload SE/30 Service Manua1 from here or here.

This web page is devoted to our 2 cents on the subject of SE/30 repair.

See also Repair Macintosh SE/30 (RMS) webpage for repairing the SE/30.
This SE repair webpage includes info relevant to the SE/30, because they are identical except for logic card.

VIRUS Description: Disinfectant 3.7.1 has been the standard and most often used virus detector for old Mac virus for many years. But it does not include all old Mac virus. This has caused many old Macs to be thrown out after their owners could not revive them with Disinfectant 3.7.1.
Repair: Virex 3.83 has been very successful at reviving those old Macs. Although the later and much larger versions of Virex will do the job, this Virex 3.83 is on a System 6.0.7 800K boot floppy.

JITTERY VIDEO Description: This common problem is not mentioned on the RMS webpage. It's usually caused by problems in the 4 pin connector (marked "P5" on the analog card) interface between the analog card and the CRT yoke. One or more pins in the analog card connector develop bad solder joints. A bad solder joint can cause excessive heating which causes heat corrosion in the associated pins within the 2 connectors. The heat corrosion will cause discoloration of the white connector shells.
Repair:

Verify that the lug of the black/white ground wire from the CRT neck video card is firmly screwed down.
If it is loose, tighten the screw and retest before doing following steps.
On analog card, remove old solder from all 4 pin connections and resolder all 4 pins.
If there is connector discoloration: Identify which pin pair is closest to discoloration. Scrape down the male pin with sharp pointed xacto knife blade. Use tweezers or needle nose pliars to compress the female pin so that has tighter grip on male pin.

VIDEO ALIGNMENT These are download links for software utilities that can be used to align the video:
Test Pattern Generator 1.06 Test Pattern Generator 1.06
Color Test Pattern Generator 2.18
Analog card adjustments are marked on the analog card cover.
Yoke adjustments are found on the RMS website here.

WE HAVE BRAND NEW RC NETWORKS FOR SALE! Description: For symptoms reported to be caused by failed RC NETWORKs see #9 at RMS website and SE FINDS SPURIOUS DISK DRIVES
They are Bourns part number 4120R-601-250/201, date coded 1993.
They replace part numbers 115-0002, 4120R-601-250/201, or P9120M115-0006.
There are three of these in a Mac SE/30, and four of them in a Mac SE.
Purchase:

They are available for $1.00 each, plus $1.00 for packaging and shipping, by emailing

We ship worldwide, from U.S.A.! Payment must be in U.S. dollars. WE DO NOT ACCEPT PAYPAL!
The accepted payment methods for U.S. buyers are cash, U.S.P.S. Money Order or BidPay.
For foreign buyers we have had success with BidPay, which we know how to manipulate so that it WILL work even though it's not an auction.
These are static sensitive parts, so handle them with same cautions as handling an IC!

Links:
Bourns data sheet (PDF)
Schematic Diagrams for SE30

REPLACEMENT TANTALUM CHIP CAPACITORS FOR THE SE/30 The original capacitors were aluminum can electrolytics. The replacements suggested here are tantalum electrolytic chip capacitors, which are (1) more reliable, (2) easier to find, (3) easier to install, (4) more expensive.
The tantalum chip caps have polarity markings that are opposite to those on aluminum can electrolytics.

REF DES   CAPACITANCE   VOLTAGE    CHIP CASE    REPLACEMENT    MANUFACTURER
         (microFarads)   (VDC)       CODE       PART NUMBER
              1.0         50 <--(ORIGINAL PART RATING)
              1.0         35          B         TAJB105K035R     AVX
C6            1.0         25          B         293D105X9025B2T  Sprague
              1.0         35          B         293D105X9055B2T  Sprague
              1.0         25          B         T491A105K025AS   Kemet
              1.0         35          B         T491B105M035AS   Kemet
C1,C3          47         16 <--(ORIGINAL PARTS RATING)
C4,C5          47         16          C         (Available)
C7,C8          47         16          D         293D476X9016D2T  Sprague
C9,C10         47         16          D         T491D476K016AS   Kemet
C12,C13        47         16          D         ECS-T1CD476R     Panasonic
Dimensions:
CASE     EIA       Length      Width
CODE     SIZE
 A       3216      0.126 "     0.063 "
                    3.2 mm      1.6 mm
 B       3528      0.138       0.110
                    3.5         2.8
 C       6032      0.236       0.126
                    6.0         3.2
 D       7343      0.287       0.170
                    7.3         4.3