Bally Williams start button light issue

[K1ngArth3r]

Whilst going over my Creature from the Black Lagoon pinball I noticed that the start button is not lit up (it's on free play).

I'm pretty sure I'm getting pulsing voltage from the bulb holder, but just to be sure I replaced the who assembly including new button and bulb.

I've measured D1 on the coin door interface board and getting the following reading, does this look in spec? I'm getting 0.L the other way.

Continuity from the lamp pin to the diode and then to the second pin on the right is good.

 

[Paul]

Circa 0.6 in the go direction, infinity the other way around... looks good to me

 

[K1ngArth3r]

Thank you Paul

I double-checked the voltage to the bulb and I'm getting 0.900 vAC > 1.266 vAC so that doesn't look right at all.

I looked at the power board and could see the red connector was to the right position on J135 (in the picture I removed it) and the yellow/blue cable is connected to pin 4 on J138.

Should I hook the multi-meter to the pins on J135 and J137 to check voltage?

 

[K1ngArth3r]

I was just reading the operator's manual and it seems that J137 and J138 on my power board are the wrong way round?

Everything seems to be working except the start button lamp, should I switch J137 and J138 over?

 

[K1ngArth3r]

I also noticed on J136 that there is a cable connected to pins 1 and 3 but there is actually no pin for pin 1 as it's supposed to be key!

I measured continuity from the Yellow / Blue lamp cable running to the lamp to what should be J138-6 and it actually goes to J136-3

I measured continuity from the Lamp to J6-4 and its OK

I measured continuity from the Lamp to J1-2 and it FAILED

I measured continuity from the Lamp to D1 and its OK

D1 to J1-2 is OK

I traced J1-2 back and it's connected to J136-1 which goes to key!!

How best am I to fix this with the place that J1-2 supposed to go being already populated? Is the Yellow/Blue Lamp cable okay in J136-3?

Could move Red/Gray from J1-2 > J136-1 to J133-1 and then Yellow/Blue from J136-3 to J137-6?

P.S. Sorry for all the posts, this is my first pinball and I'm still learning.

 

[K1ngArth3r]

I have just done the above and now it is working

 

[BigIan]

wel done, small thing but satisfying