For a black knight system 7.
I thought I solved this issue but I didnt. I put a memory cap in and put a 0 ohm jumper in at d17. The voltage at the positive side of the memory cap is 5v. Voltage at the jumper at d17 is 5v. Voltage at ic19 pin 22 the cmos ram is 5v. Ground to the memory cap has continuity to the ground braid.
It will hold memory for a short period of time. I'm not exactly sure how long, at least 15 minutes. But not overnight. In trying to diagnose this I know it may be the ic19 chip 5101 cmos ram. But before I go replacing it I want to run it by the pros on here.
Something I found odd is the coin door lockout switch/button is missing. The wires have been soldered together by the previous owner. Im not sure if this may be causing the game to boot into audit mode. I provided a picture of the wires I believe go to thee coin door lock out switch. Any help is greatly appreciated. 20140516_124450.jpg

Hmm. I found the black/red wire. It was cut way back by the tilt. Could anyone provide a pic of the back of that switch? Is there a diode? Could I attach the white wires to the black/red wire and bypass the coin door switch?

Itll go into attract mode if I quickly turn it on off on. I think its the 5101 but I noticed the coin door switch not hooked up and thought it may be causing the issue. But if its normally open than the switch being disconnected shouldnt cause the issue, right?

When I tested the 5101 at u19 pin 22 and it reads 5v.

Well... I replaced the 5101 cmos ram chip at u19. And also put a new memory cap in. Turned the machine on for an hour to charge the cap. Turned off and waited a while. Turned on and it still boots into audit mode.

Not sure where to go from here. I have the schematics for a Jungle Lord but dont know where else to look for a resolution to this issue.

Bump for the day time.

With the new memory protect switch behindo the coindoor, the coindoor has to be open in order for the on off on "trick" to work. I'm going to install a remote battery instead of the memory capacitor. The memory capacitor doesn't seem to hold the charge.

Replaced the diode at d18 (1n5817) and re-replaced the d17 (1n4148) and put a battery pack instead of the memory cap.
Oddly enough the d18 diode was a jumper and no diode, schematics say its supposed to be a 1n5817 so that's what I put there. Everything is working. Shut it off for an hour and it's holding the memory. Fixed.