Started by RobertM, 10:36, 11 February 14
0 Members and 1 Guest are viewing this topic.
Quote from: gerald on 10:39, 12 February 14If the main bank of ram is failing, you can switch to the second one: - remove the PAL from its socket - on the socket : - link pin 9 to pin 19 (A14 to A14out) (Eq to LK5) - link pin 8 to pin 12 (A15 to A15out) (Eq to LK6) - link pin 7 to pin 16 (NCAS to NCAS1) - link pin 17 to pin 20 (NCAS0 to VCC)If your CPC boot, then either the PLD or ram bank 0 is failing.You can now test bank 0 by changing connecting NCAS(pin7) to NCAS0(pin17) and NCAS1(pin16) to VCC(pin20) on the socket.You can also double check the schematic for pin connection : http://www.cpcwiki.eu/manuals/service.manual.cpc6128.ctm644.gt65.zip
Quote from: RobertM on 13:42, 12 February 14I think I can get the RAM / CPU chips but I doubt I could get a gate array.
Quote from: RobertM on 01:16, 15 February 14If the members here are interested I can do a write up with pictures on how to replace chips. The one that is here is OK but a bit risky by using a drill through PTH (Plated Through Holes). The PTH of this era was generally poor and using a drill is dicing luck. Often one side of the PTH had small coverage and the rest had none. If the drill happens to hit the side that has coverage then the board is toast as you never going to find the faulty PTH VIA.
Page created in 0.182 seconds with 53 queries.