Novice taking a stab at troubleshooting. Stern Meteor displays are out.
The playfield lamps are fine, the MPU boots, and games do play fine with
no errors. Just no display.
TP2 voltage on SDU-100 shows 85.6-87.9 Volts where there should be 185V according to schematic. RT1 does not change measured voltage. Replaced
C23 and C26 capacitors with no improvement. TP4 shows 250V. VR1 shows
65V where schematics says it should be 140V. So all the voltages are different from schematics.
Any thoughts where the fault could be? Easier to just punt and swap in
an Alltek board?
On 2024/05/21 8:07 p.m., Othello wrote:
Novice taking a stab at troubleshooting. Stern Meteor displays are
out. The playfield lamps are fine, the MPU boots, and games do play
fine with no errors. Just no display.
TP2 voltage on SDU-100 shows 85.6-87.9 Volts where there should be
185V according to schematic. RT1 does not change measured voltage.
Replaced C23 and C26 capacitors with no improvement. TP4 shows 250V.
VR1 shows 65V where schematics says it should be 140V. So all the
voltages are different from schematics.
Is the voltage being measured with or without any load. My suspect is
that the pass transistor is open - check what the voltages are on the
driver transistor for the pass regulator
Any thoughts where the fault could be? Easier to just punt and swap in
an Alltek board?
Easier? Yes, certainly easier, and the Alltek boards are very reliable - I've been selling them for a couple of decades now.
https://flippers.com/catalog_oc/bally-stern-alltek-ultimate-solenoid-driver-board-ultimate-sol-drv
However I find it more fun to fix the board - if you like troubleshooting!
John :-#)#
On 2024/05/21 8:07 p.m., Othello wrote:
Novice taking a stab at troubleshooting. Stern Meteor displays are
out. The playfield lamps are fine, the MPU boots, and games do play
fine with no errors. Just no display.
TP2 voltage on SDU-100 shows 85.6-87.9 Volts where there should be
185V according to schematic. RT1 does not change measured voltage.
Replaced C23 and C26 capacitors with no improvement. TP4 shows 250V.
VR1 shows 65V where schematics says it should be 140V. So all the
voltages are different from schematics.
Is the voltage being measured with or without any load. My suspect is
that the pass transistor is open - check what the voltages are on the
driver transistor for the pass regulator
Any thoughts where the fault could be? Easier to just punt and swap in
an Alltek board?
Easier? Yes, certainly easier, and the Alltek boards are very reliable - I've been selling them for a couple of decades now.
https://flippers.com/catalog_oc/bally-stern-alltek-ultimate-solenoid-driver-board-ultimate-sol-drv
However I find it more fun to fix the board - if you like troubleshooting!
John :-#)#
John Robertson wrote:
On 2024/05/21 8:07 p.m., Othello wrote:
Novice taking a stab at troubleshooting. Stern Meteor displays are
out. The playfield lamps are fine, the MPU boots, and games do play
fine with no errors. Just no display.
TP2 voltage on SDU-100 shows 85.6-87.9 Volts where there should be
185V according to schematic. RT1 does not change measured voltage.
Replaced C23 and C26 capacitors with no improvement. TP4 shows 250V.
VR1 shows 65V where schematics says it should be 140V. So all the
voltages are different from schematics.
Is the voltage being measured with or without any load. My suspect is
that the pass transistor is open - check what the voltages are on the
driver transistor for the pass regulator
Any thoughts where the fault could be? Easier to just punt and swap
in an Alltek board?
Easier? Yes, certainly easier, and the Alltek boards are very reliable
- I've been selling them for a couple of decades now.
https://flippers.com/catalog_oc/bally-stern-alltek-ultimate-solenoid-
driver-board-ultimate-sol-drv
However I find it more fun to fix the board - if you like
troubleshooting!
John :-#)#
If it wasn't for me busting every pinball machine this newsgroup,
probably wouldn't exist.
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