Re: Weak TZ Flippers.
- From: necro_nemesis <necro_nemesis@xxxxxxxxxxx>
- Date: Mon, 08 Oct 2007 17:10:21 -0700
On Oct 8, 6:40 pm, PinAffliction <s.to...@xxxxxxxxxxxxx> wrote:
With the machine in attract mode your flippers should read almost 70
volts from any coil lug to ground. If not I would suggest digging into
the flipper power supply, likely either a bad leg in a bridge
rectifier, high resistance in connectors, or bad or miswired
transformer windings (more likely).
BTW what is your input voltage from the wall?
Of the 16 pins I recently decided to verify the transformer tap
jumpers, three were wired wrong.
There are essentially two 115 volt transformer primary windings in WPC
transformers and many others. Each of these primary windings also has
a tap about 10% from one end, to allow for line adjustment.
Both windings are put in parallel for 100-120 volt service, they are
put in series for 220-240. The full winding of each is used for the
higher input voltages of each service range (120 or 240), the taps are
used when input voltage is at the lower end of that range (100 or
220).
If the transformer is jumpered incorrectly, you could have incorrect
output voltages, for instance if only one of the two primary windings
is good on a 120 volt configuration, you would see approximately the
correct output voltages with no load, but the maximum current capacity
would be about half, causing the output voltages to sag under load.
The transformer tap configurations are shown in the WPC schematics,
your transformer should be p/n 5610-12835-00.
For 115v operation, the black wire should go to pin 1, while pins 2
and 3 should have a small jumper (preferably black). The white wire
from line input should go to pin 7, and pins 8 and 9 should have a
small jumper (preferably white).
This applies the line voltage across the whole of one primary winding
with the two jumpers putting the second primary in parallel with the
first, doubling the current capacity of the transformer output.
Check your line voltage, these jumper settings and report back.
Regards,
Scott
On Oct 8, 4:06 pm, necro_nemesis <necro_neme...@xxxxxxxxxxx> wrote:
I measured the voltages at the flippers under load. 42.5 left and 42.3
right. Anyway I pulled the opto boards and reflowed them. The voltage
went up marginally to about 42.8 but that could of been a result of
just about anything (the position of the sun or maybe I farted when
taking the reading). Anyway I thought this voltage is supposed to be
higher. The 50V test point TP6 on the driver board without any
substantial load is showing 63 volts.
As for position of the flippers, they are right on spec to the
alignment holes. The EOS switches do not come into play prematurely
and I am back to scratching my head. What do you guys think of these
readings?- Hide quoted text -
- Show quoted text -
114.1 volts at the wall
Pin 1 is white, Pin 7 is black pin 3 to 4 are jumpered and so is 5 to
6. But the jumpers are irrelevant since they have nothing on the other
side of the connector to go to. The other side is only the respective
1 and 7 line.
Now further back right at the tranformer there is anouther connector.
It has the same configuration for white and black and has the jumpers
in as you indicated for the 115 volt operation. i.e 2 3 jumped and 8
to 9 jumped. That one actually has a multitude of wire going directly
to the transformer on the other side of the connector, so changing
those would definitely have an effect.
.
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