Re: Meteor project problems?
- From: mike.nolte@xxxxxxxxxxxx
- Date: 4 Mar 2007 15:14:14 -0800
I managed to pick up a nice little DMM today for $40 at the SOURCE in
town. So I started to check values. Check it out and let me know what
you think. Take a good look at TP3 of the solenoid driver board. I
think something is wrong there.
I also tested the reset circuit by jumpering pin 39 and 40 of U9 and
nothing except a small buzz in the speaker. I checked the voltages at
pin 40 and they were 5.48 with power on and initially at start up it
would spike to 8.4vdc for less than a second. I also checked pin 2 on
U9 and it was at 5.21 volts. So do those values indicate the reset
circuit is good? If it is perhaps the voltages listed below could be
the culprit. Take a look and let me know what you think.
Before I list the voltages though I did a couple other things which I
thought need to be done anyway:
: Ran 18awg wire for gnd from MPU mounting screw above TP4 gnd to each
board and then down to the ground strap of the back box. Good gnd
continuity now.
: installed a new cap at c23 of the solenoid driver board
: Installed a new rectifier board (you new this already)
: put in original roms to match current jumpers on pcb.
So onto the voltages. Here are the voltages I should have on each
board according the the pinrepair website and next to each is the
voltage value I have: Oh and my values were take with the connectors
attached on the rectifier board.
Test Points.
Rectifier Power Supply Board:
TP1 = +5.4 vdc (AS2518-18 version), +6.5 vdc (AS2518-49 & -54
versions) feature lamps. 6.07
TP2 = +230 vdc (score displays) with connector J3 attached, 150 vdc
with J3 disconnected. 234
TP3 = +13 to 16.5 vdc with connector J3 disconnect, +12 to 14 vdc with
J3 connected. This voltage will become the +5 regulated
voltage. 14.67
TP4 = 5.7 to 7.3 volts AC (general illumination) 6.54
TP5 = +43 vdc (solenoid voltage) 44.5
GND = Ground
MPU board:
TP1 = +4.9 to 5.2 vdc 5.24
TP2 = +12 to 14 vdc 14.58
TP3 = +21.5 vdc (comes from +43 vdc solenoid voltage).
22.36
TP4 = Ground
TP5 = +4.9 to 5.2 vdc 5.29
Solenoid Driver/Voltage Regulator board:
TP1 = +4.9 to 5.2 vdc 5.34
TP2 = +190 vdc (but often turned down to 170 volts to increase score
display life). 184.3
TP3 = +4.9 to 5.2 vdc .612 ?? bad wire??
TP4 = +230 vdc 237.8
TP5 = +12 vdc to 16.5 vdc 14.53
Note if TP2 and TP4 are both 230 vdc, then the High Voltage portion of
the solenoid driver board is not working and needs to be repaired.
If you think some of the voltages are a little high on the MPU, how
would I tone them down a little? Also whats going on the TP3 of the
Solenoid Drive board? I'm not even getting 1 volt and am wondering if
I have a bad wire, perhaps at the rectifier when I rewired it.
Hopefully I'm not boring you all with all of the voltage readings but
I thought I would be thorough. And if your like me I don't find it
boring at all. Problem solving keeps the mind sharp so hopefully with
everyones help we can figure it out.
So if you have any observations or an opinion that might help me
figure this out than please "jump in".
Thanks, Mike
.
- References:
- Meteor project problems?
- From: mike . nolte
- Re: Meteor project problems?
- From: Snux
- Re: Meteor project problems?
- From: mike . nolte
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