Black Knight Ball Launch Fix

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RichPundit
Posts: 33
Joined: Thu Jan 19, 2017 7:43 am
Location: Appleton
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Black Knight Ball Launch Fix

Post by RichPundit »

Original Post: "Bought a Black Knight pin last year with LEDs & Topper for $1800. It worked well. Haven't played for several months cuz have epilepsy & the flashing lights are a problem. However, recently put on the market for local sale, & the machine works except for the ball launcher. The balls stay in place after repeated resets. The wire connections look solid, have 3 balls in place & batteries are good.

Please help! Tx - rich (Appleton, Wisconsin)"
From Toyguy @Pinside:

"<blockquote cite="#4537848">Put it in coil test and see if balls kick out to the plunger lane. If not, maybe a wire came loose on the coil. If that test is OK, remove all the balls, raise all the drop targets and go into switch test. See if all of the ball trough switches register as you roll balls into the drain. If any balls are in the lock, it could also be those switches. It won’t start unless it sees 3 balls.</blockquote>

Status: ran Diagnosis ok until Solenoid Test. None of the solenoids fired. Is this a blown fuse or something else? Obviously am inexperienced with these kind of repairs. Ur thoughts are appreciated - rich
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My lineup: Flying Circus, 4 Aces, Breakshot, Swords of Fury, Arkanoid, Olhausen pool table ...

Eric_S
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Joined: Sat Jan 18, 2014 9:02 am
Location: Neenah, WI
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Re: Black Knight Ball Launch Fix

Post by Eric_S »

Probably a blown solenoid fuse on the power supply board. My guess is one of the driver transistors shorted out, causing a coil to lock on and blow the fuse.

Good repair info here: http://www.pinwiki.com/wiki/index.php?t ... stem_3_-_7

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RichPundit
Posts: 33
Joined: Thu Jan 19, 2017 7:43 am
Location: Appleton
Contact:

Re: Black Knight Ball Launch Fix

Post by RichPundit »

Eric_S wrote:
Tue Aug 21, 2018 4:44 pm
Probably a blown solenoid fuse on the power supply board. My guess is one of the driver transistors shorted out, causing a coil to lock on and blow the fuse.

Good repair info here: http://www.pinwiki.com/wiki/index.php?t ... stem_3_-_7
Makes sense … Tx very much!
My lineup: Flying Circus, 4 Aces, Breakshot, Swords of Fury, Arkanoid, Olhausen pool table ...

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