New to Famicom - loading games

[dq333]

Hello folks,

Just acquired an AV Famicom and love the look of it  , although it's how well it works that counts.  So, I can load up one of my games, Punch Out perfectly every time, however other games don't load up instantly most of the time and just show up a blank screen.  But, if I press reset the games work like 90% of the time.  Even if the graphics are glitching, pressing reset fixes this.  Is this considered normal?  I am used to really inserting a game and seeing it either load up perfectly or with glitches ala NES, but seeing a blank screen alot has me worried.  I have never had to press reset with other old consoles to get games working.  I have cleaned the game contacts with 90% isopropyl alcohol.  I'm gonna clean the console slot tonight.  I've heard that bootleg games require you to press reset to get them to work, but none of these games are pirate copies.

[famifan]

considering it like a normal

some carts are loading better than others.
it counts a lot of factors such as PCB thickness, slot wear. Also PCB on some carts is hanging loosely

regarding reset... Sounds that your system can't power on properly. It can be clocking crystal or capacitors/PSU related issue.

Not sure if need to worry about as the system works flawlessly

[dq333]

Thanks for the reply.  I cleaned the slot yesterday with a brush and scrubbed the cart contacts also.  Works much better  .  Love this system.  Must say, Crisis Force is incredible!

[famifan]

maybe i was wrong in my previous post

according to publicly available famicom's schematics the system has the simplest power-on reset circuit which is actually represented by 0.47uF capacitor. Also it seems that CPU's #RST pin is internally pulled-up. So the actual value is unknown but typically it has a couple of 10 kOhms resistance

typical human reaction is about 30 ms if just hitting reset button fast without holding.

If internal pull-up assumed as 10kOhms - you need 4.7u capacitor instead of 0.47u to get 30ms reset in theory.
Bigger the cap gives the longer reset delay.