Electronics > Repair

Vintage/Classic Chassis/Mechanical Renovation/Restoration Techniques

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Inspired by these excellent posts in eevblog and my own very limited mainly electronic only repair of some old HP gear of mine, I thought putting some of the exceptional repair posts in one location so that it may help those about to MAINTAIN OUR HERITAGE, (OK that is a bit over the top).
tautech has started an excellent 'manual collection' archive (see sticky topic) and I thought posts that look at the chassis/mechanical areas may be of interest.
All credit to
robrenz  https://www.eevblog.com/forum/testgear/hp-3410a-ac-microvoltmeter-restoration/msg433969/#msg433969
- Cal/Sticker Removal       - Polishing Bakelite knobs
- Polishing BNC                - Engraved Dial Restoration
- Texta from Vinyl            - Analogue Meter Dial Repair
- Scratch from Plastic/Al   - Repair Al Corrosion
- Panel Dent Repair
3D Print Files for those lost feet, knobs, fittings - invaluable
 - Thanks beanflying et al
High Quality Finishing 3D printed butons etc Thanks xrunner  See reply 110705
General Tube/CRO Wisdom!
- Tek Oscilloscope Fault Finding http://www.sphere.bc.ca/test/tek-parts/troubleshooting-scopes.pdf/
- Soldering Ceramic Strips       - Repair Filament Transformer Tek555
- Plug In Panel Repair 555      - Cleaning Tek Cover Panels
- Rebuild Filer Frame Tek515  - Panel Construction Tek515
- Dust Removal                      - Tube Placement 'Map'

CRT restoration for the brave.
        KE5FX http://www.ke5fx.com/crt.html
- Extreme DMM Repair
   by TiN  https://www.eevblog.com/forum/testgear/restoration-glory-of-keithley-2001-dmm/?topicseen
- TiN A Keithly 'God' - now converting to the dark side - HP. A volt nut extreme++
table of cleaning methods and potential problems
 by ModemHead http://mrmodemhead.com/blog/dirty-multimeter-clean-up
 also - methods of getting access to various sections of Flukes
        - repair of 80 series Fluke terminals  http://mrmodemhead.com/blog/fluke-80-series-jack-assembly-rebuild/
Xrunner https://www.eevblog.com/forum/testgear/hp-3435a-extreme-makeover/
  - good clean of a MM, ribbon cable repair
- repair of keyboard membrane
Xrunner and PedrodaGr8  https://www.eevblog.com/forum/testgear/keithley-179-trms-dmm-repairrefurb/
 - Repair of Fluke DMM and some great PLASTIC WELDING TIPS reply 72

TEK SCOPE REPAIR (the warm glow of a CRT!)
  - 502/555 +Others  https://www.eevblog.com/forum/testgear/vintage-tek-restoration-pictures-by-martin/
  - 465        https://www.eevblog.com/forum/projects/tektronix-465-repair-and-restoration/msg85387/#msg85387
  - 485        https://www.eevblog.com/forum/repair/tek-485-repair-and-restoration-prologue/
  - 2465B    https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown
  -7603      https://www.eevblog.com/forum/testgear/tek-7603-scope-w-7a18-amp-7b53a-timebase-restoration/msg172135/#msg172135

HP/Agilent/Keysight Mechanical Probs
   - 34401  Front-Rear Switch Problem https://www.eevblog.com/forum/testgear/hpagilentkeysight-34401a-2w-problem/
   - 53230 Intermittent Ch 1 BNC connector   https://www.eevblog.com/forum/testgear/comparing-two-hp-z3805a-gpsdo-10-mhz-frequencies-for-lab-use/15/  see reply 28
   - 1980s "clacky" Button Problem http://www.rbarrios.com/projects/hpswitch/

Old Hard Drive equipment
    - https://www.eevblog.com/forum/testgear/preserving-test-equipment-with-hard-drives/

Old equipment Front Panel / Potentiometer Shaft Repair
    - Engraved Dial Repair see robrenz re 3410 link above
    - Glass Dial Repair https://www.eevblog.com/forum/repair/repro-glass-dial-scale-for-a-hallicrafters-s-38d/
    - Repair of twin shafts  Mnementh reply 9190 on Test Equipment Anonymous (TEA) group therapy thread ~p368

3D Printing Front Panel Parts
    - Phillips PE1539 / PM6670 ; ch_scr uses 3D printer to great application https://www.eevblog.com/forum/repair/late-70s-early-80s-philips-test-gear-bezel-cover-replacement/

Nixie Tubes
    - Rejuvenation (some limits) http://www.tube-tester.com/sites/nixie/different/cathode%20poisoning/cathode-poisoning.htm/
    - and https://www.eevblog.com/forum/repair/rejuvenating-nixies-some-comments-photos/
VFD Rejuvenation
    - https://www.eevblog.com/forum/chat/vacuum-fluorescent-display-rejuvenation/
Fluke DMM repair / restoration;  MrModemhead has excellent website
    - see xrunners work above re Fluke 179

OLD AC POWER CONNECTORS cubdriver and bitseeker found a great archived webpage

Cleaning Dead Battery Goop From Terminals. Abbrev from mnementh
....Scrub battery connectors and PCBs with a toothbrush (or where possible without destroying plastic, a stainless steel detail brush) and Windex (Real Windex, or the good store brand stuff that you can smell has with lots of ammonia in it) to neutralize alkaline deposits and clean battery contacts down to clean metal. Rinse with distilled water and dry on a towel on your dash in the sun, or use your hair dryer/heat gun on low as conditions demand.
.... smear a little silicone dielectric grease (can get cheaply from auto/car part suppliers)  between the batteries and contacts to prevent corrosive relapse common with cleaned battery terminals.

These 'postees' have freely shared knowledge about areas not easily found elsewhere.
Edits; Links corrected, techniques described, Tek scope section added
PS As a suggestion,  include a  photo of the finished item,  and a brief description of an included technique eg removing texta from vinyl

shameless self promotion  :-[ 



Good link for the 3410A ac-microvoltmeter restore


--- Quote from: robrenz on January 22, 2015, 01:48:43 pm ---shameless self promotion  :-[ 

--- End quote ---
Rubbish. You're worthy of of the respect many hold of you for your brilliant work.  :-+

C'mon EEVbees where are other threads worthy of inclusion?

Thank you very much! 

This Tek 465 repair/restore by ModemHead definitely belongs here  :-+

Thanks for the link,  Interesting baking soda toothpaste technique.  I have used car polish to get rid of small scratches on a plastic screen before (avoiding lettering) with success but did not take before photos.


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