You know that IC27 is good, because that's what The 4028s (IC35, IC36, IC27) are decoders for the address
#Zaccaria pinball does not start driver#
The selects to the driver board run through IC40. If I had to bet, I'd put $5 on it being IC40. When the outputs are being clocked out, IC21 is used to When the CPU is writing to the 2101, the "Address Bus" is used toĪddress it. IC16 and IC22 alternate between CPU and output addressing of the 2101. They're probably ok,īecause otherwise you'd be having problems with the displays. IC16 and IC22 control addressing to the 2101. With the 3081s between IC35/IC36 and CN12.
YouĬould have a problem with IC35 and IC36 (possible, if not likely) or Generates the selects for the displays, and they're working. > Those 3 are connected trough Ic16 and Ic22 with Ic23 (2101) > I figured out that something bad can be Ic21, Ic27 or Ic27 >"See the bottom right section of the schematics. Test 5 : Sound : Should cycle through all of the sound and speech calls. Verify that the 24 solenoids each kick when they are supposed to.
#Zaccaria pinball does not start manual#
Test 4 : Solenoids : Use the manual page "Solenoid Arrangement" and Test 3 : Lamps : About all you can test here is to see if the lamps are Playfield from switch matrix problems that are on the CPU. This can help isolate switch matrix problems that are on the Alternately, if you pull CN10 / CN11 youĬan use a jumper wire between pins on Cn10 and Cn11 to "close" each Test 2 : Switch Matrix : Use the the manual "Contact Arrangement" pageĪnd verify that each switch, when closed, reports the correct number,Īnd _only_ the correct number. Use the Advance switch on the coin door to get When the matrix is disconnected, that points us toward a switch matrix Playfield, then we can reasonably guess that it's not because there isĪ problem with the switch matrix. With the switch matrix disconnected, if it's still doing anything on the What happens if you disconnect CN10 / CN11 from the CPU? These are the You're still having trouble with this game? Wow. > Game starts and seems to be working fine except for random coils and mechanisms flickering on and off during gameplay and attract mode. > Does anyone out there have any idea what could be causing this: Once I stick it back in the game all hell breaks loose.ĭoes anyone have any idea what's up with this damn thing? I'm too stupid to get out a logic probe and oscilloscope- wouldn't have the first clue what to do or look for. David Gersic has tested the CPU board now three times and everything seems to check out fine.
Then the fuse blows and pop bumpers and other cpu controlled coils stop working.Ĭertain switches and coils (left slingshot, right upper playfield ball gate and right & left outlane flippers & switches don't respond) Drop target release coils erratically energize at any time like it's having a seizure. Motorcyclist starts running erratically on and off for no reason. Game starts and seems to be working fine except for random coils and mechanisms flickering on and off during gameplay and attract mode.īall trough will randomly shoot a ball out to the shooter lane during attract mode. Does anyone out there have any idea what could be causing this:
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