Quoted from SealClubber:

Moved to EM Tech where those with ancient knowledge reside. Ohmmmm.

Quoted from Dr_of_Style:

Dont have that pin, but I would start with the player unit, and the coin unit. they work together.
then bonus unit, any relays that say bonus, or coin, etc.

Quoted from dr_nybble:

By 'skipping ball 1' do you mean that when you start a game it goes right to ball 2?
I have seen videos by Clay where he showed Gottlieb steppers need to start BEFORE the first ball; maybe your stepper unit is not aligned properly so it advances past ball one on start up? Some photos might help.
This video may be useful: » YouTube video

Quoted from woz:

On the first ball, does the Player Unit advance when the ball is kicked into the shooter lane?
I would check the ZB First Ball Relay in the control bank. Contacts on ZB control the operation of the 2ND PLAYER RELAY "PB" and also advances the ADD "PLAYER" UNIT. Check the switch stack screws are tight, switch operation and for wires shorting on the solder tabs.
Capture_(resized).JPG

Quoted from woz:

I'd like to determine whether the Player Unit is advanced by the ball in the outhole or as it crosses the trough switch (under the apron) before it enters the shooter lane.
Try this: remove the ball from the outhole and reset the game. Operate the outhole switch manually and see if the Player Unit advances and bonus counts.

Quoted from woz:

I'd like to determine whether the Player Unit is advanced by the ball in the outhole or as it crosses the trough switch (under the apron) before it enters the shooter lane.
Try this: remove the ball from the outhole and reset the game. Operate the outhole switch manually and see if the Player Unit advances and bonus counts.

Quoted from woz:

The Player Unit should't be advanced by the trough switch until the first ball has been played. (The 1st Ball relay ZB is operated by either the 10 or 100 point relay....)
Having just typed that last sentence I realized that the bonus that is being scored is operating the ZB relay! Check that all the drop targets are resetting correctly and the switches (two for each target) are all fully open.

Quoted from woz:

So it starts up OK now?

Quoted from rolf_martin_062:

Hi Pinballrus
do You have a schema ? I do not own this kind of pin - but have a schema for "Jack in the Box".
Your 1): Here: http://www.ipdb.org/showpic.pl?id=1329&picno=8415 -> the shooter-Alley ->way up -> a "bent wire" -> underneathside of the playfield -> a Normally-closed-Switch - in my Jack in the Box schema at H-7 it is called "Runway-Switch" - when actuated: It cuts "Self-Hold-Circuitry of BX-Extraball-Relay". Does this switch opens ? A drop of solder on the side where the wires are soldered-on ?
Your 2): I have played this machine - I do not remember ... Question: Is Your pin set to "Liberal" or "Medium" or "Conservative" (Special Frequency Adj.) ? I do NOT believe it affects that strange "behavoir" - but "nice to know for looking in the schema".
Question: When You gain an extraball (and so "fault 2)"): AAA: ONLY the kicker (Ball Return Coil) is activated <-> BBB: The O-Outhole-Relay pulls-in and the Score-Motor turns ?
(((Maybe a Normally-Open-Switch on O-Relay is faulty closed ?))) Greetings Rolf

aJitB-Adj_(resized).jpg

Quoted from rolf_martin_062:

Hi Pinballrus
I would like to concentrate for now on that Switch underneath the playfield, here the picture from ipdb - enriched with a green circle -> there is the switch. Greetings Rolf

image-1_(resized).jpg

Quoted from rolf_martin_062:

Hi Pinballrus
I would like to concentrate for now on that Switch underneath the playfield, here the picture from ipdb - enriched with a green circle -> there is the switch. Greetings Rolf

image-1_(resized).jpg

Quoted from woz:

Check the "drop target series switch" on the target bank (closes when all targets down).
Check that all switches on the bank are open when the drop targets are in reset position.

Quoted from woz:

Did you have the extra ball issues before you cleaned the drop target bank?

Quoted from rolf_martin_062:

Hi Pinballrus
a strange situation. I show a snippet of schema Jack in the Box. I want to find out AAA: The problem is in the circuitry of "Self-Hold-circuitry" - BBB: The problem is in the circuitry of "feeding the Coil on the Extraball-Relay - BUT faulty feeding-forever".
Please look for the BX-Extraball-Relay -> a short wire of any-color runs from one side of the coil to a switchblade (usually Bottom-Switch, bottom blade). AT THAT Solder-Lug is also soldered on: One or two wires "color-white". THE OTHER Switchblade has soldered-on: One wire "color-blue-mingled-with-black" -> UNSOLDER*** wire "blue-black". Then start a game and gain "Extraball" - have a good look at the BX-Extraball-Relay: Does it pull-in and let go (means problem-type AAA) <-> it pulls-in and keeps-on pulling (means problem-type BBB) ? (((A slight chance - CCC is: The relay does NOT pull-in - not a tiny bit of pulling)))
What do You have ? (AAA or BBB or CCC) ?
UNSOLDER***: K-Mart and such stores -> Automotive Departement -> Car Electrics -> single plugs (male and female) - You can mount these plugs by squeezing --- using a pair of pliers.
Unsoldering a wire is easy - but when I am afraid of "cannot solder the wire back-on": Then I cut the wire a couple if inches away the solder-lug --- and mount such plugs - I take a cigarettd lighter and burn away a bit of the insulation ...
Theory: problem-type-BBB would be strange - circuitry with many switches (would have to be faulty) these circuitrys end in a wire-color-WHITE.
problem-type-AAA is rather simple - BUT You have written "checked the runway switch and this switch is good".
So I want to find out: Do You have AAA or BBB or CCC ? Greetings Rolf

0JitB-Work1_(resized).jpg

Quoted from woz:

So the cleaning changed something then
Did you remove the bank from the playfield? Did you desolder any wires? Can you post some closeup pics of the target bank?