IBM pcjr - Page 1
Forum section: electronics / general

author: ttx450
author_rank: Regular Contributor
timestamp: January 10, 2021, 12:00:50 am
content: just talking here.. I was thinking of restoring my old pcjr, this winter, but will see. dont want to damage anything by plugging in. it worked when I last pluged in many yrs ago. am original owner, elc caps an issue? getting close to around 40yrs old.. replace all caps or only power.. this unit has external transformers, have both (2drives) did not look inside in many yrs.. thksedit- should add crt have original monitor. pwr section?

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 10, 2021, 12:34:48 am
content: If my memory is intact, there were no pulse converters in old-school motherboards. Most likely, you won't even find electrolytic caps on it. The board itself is not in danger, it will work in 100 years, I think.And I would put a modern power supply or check the old one well.P.S. By the way, pcjrs practically did not appear in Russia, I only remember the mention of them in Norton's books - there is some unusual video board, if I'm not mistaken, or it is built-in.

author: Rasz
author_rank: Super Contributor
timestamp: January 10, 2021, 10:35:37 am
content: afair plenty of tantalums on board, cards and floppy drive, plus film X cap in the supply

author: Canis Dirus Leidy
author_rank: Regular Contributor
timestamp: January 10, 2021, 08:47:06 pm
content: Quote from: S. Petrukhin on January 10, 2021, 12:34:48 amQuote from: Rasz on January 10, 2021, 10:35:37 amWell, ifthis sitedoes not lie to us, then there topicstarter need to check about twenty capacitors.UPD: And here there is also a forum dedicated to PCjr (including hardware and repair):https://www.brutman.com/forums/index.php

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 10, 2021, 08:58:17 pm
content: Quote from: Canis Dirus Leidy on January 10, 2021, 08:47:06 pmI wanted to say more that faulty capacitors in the old circuits do not carry the risk of damage because they are only filtering... Maybe I'm wrong-it's not interesting to study the scheme from the past.

author: ttx450
author_rank: Regular Contributor
timestamp: January 14, 2021, 01:18:46 am
content: thks, yea I belong to that forum, but have not visited it in over a year. Been playing with general elc, just curious. Power supply is enclosed, they are remote units.. many people dont have them..they get lost. I have 2 (2-drives), believe those are just transformers and some sort of pwr board is in puter, not sure.yes puter had a funky video board, 16 colors back then - state of art.. I got this when I was like 18-20 and believe the salesmen knew it was discontunitued when it was released.. abt 6 months. got took on price, very expensive back then.I used it many, many hrs. going to fire up king quest 1 and leisure larry

author: ttx450
author_rank: Regular Contributor
timestamp: January 14, 2021, 01:39:41 am
content: Quote from: Rasz on January 10, 2021, 10:35:37 amtantalums are usually replaced by age?

author: Rasz
author_rank: Super Contributor
timestamp: January 14, 2021, 02:25:55 am
content: Quote from: S. Petrukhin on January 10, 2021, 08:58:17 pmQuote from: ttx450 on January 14, 2021, 01:18:46 aminexpensive? junior was like 1/2 full pc cost from what I rememberQuote from: ttx450 on January 14, 2021, 01:39:41 amthey short out and explode

author: ttx450
author_rank: Regular Contributor
timestamp: January 14, 2021, 02:30:11 am
content: Quote from: Rasz on January 14, 2021, 02:25:55 amcost dont remember, but was around $1200+- new pc were the same price. I went this way pcjr had better video then at pc entry level.. video and video editing was not there or just starting. silicon graphic was ahead of pc's

author: bob91343
author_rank: Super Contributor
timestamp: January 14, 2021, 06:18:13 am
content: I would be surprised if the disk drive works.

author: ttx450
author_rank: Regular Contributor
timestamp: January 15, 2021, 11:26:34 pm
content: Quote from: bob91343 on January 14, 2021, 06:18:13 amhi bob, are you the bob I knowwill not turn on until I open up and look closer. I have a bunch of old 5.25 floppy's, do you know if those are any good?