Rowe R-92 Lamp Control Board Schematic

Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201).

I need to make some repairs and the manual only shows a picture of
one. It appears a light fixture shorted out at one time and someone
tried to "repair" the board, with no luck. Ihave located the light
issue, now I need to repair the board.

Any help is appreciated.

On Mar 26, 5:43*am, elkridge pinball wrote:
Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201).




You'd want the "Shop Service Manual" which comes in a brown flexible
plastic 3 ring binder. It has at least 50 double sided 11" x 17" full
size schematics, parts lists, and board layouts for every unit in the
R92. You can still buy these through a Rowe distributor. Just say you
want the "R-92 Shop Service Manual". Make sure they do not confuse it
with the usual field service manual and field parts manuals. This one
specifically says _SHOP_ manual.

I have the R90 Shop service manual, but the light controller schematic
is not the same part number that you mention.

On Mar 26, 12:07*pm, Ken Layton wrote:
On Mar 26, 5:43*am, elkridge pinball wrote:

Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201).

You'd want the "Shop Service Manual" which comes in a brown flexible
plastic 3 ring binder. It has at least 50 double sided 11" x 17" full
size schematics, parts lists, and board layouts for every unit in the
R92. You can still buy these through a Rowe distributor. Just say you
want the "R-92 Shop Service Manual". Make sure they do not confuse it
with the usual field service manual and field parts manuals. This one
specifically says _SHOP_ manual.

I have the R90 Shop service manual, but the light controller schematic
is not the same part number that you mention.

Ken,

Thanks for the help, let me double check that part number when I get
home tonight, I grabbed that one online so I might be wrong.

Thanks again,

Jay

On Mar 26, 12:07*pm, Ken Layton wrote:
On Mar 26, 5:43*am, elkridge pinball wrote:

Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201).

You'd want the "Shop Service Manual" which comes in a brown flexible
plastic 3 ring binder. It has at least 50 double sided 11" x 17" full
size schematics, parts lists, and board layouts for every unit in the
R92. You can still buy these through a Rowe distributor. Just say you
want the "R-92 Shop Service Manual". Make sure they do not confuse it
with the usual field service manual and field parts manuals. This one
specifically says _SHOP_ manual.

I have the R90 Shop service manual, but the light controller schematic
is not the same part number that you mention.

E-mailed Rowe to get the part number for the Shop Service Manual, they
replied the only manula they show is the normal service manual.

Anyone know where I might be able to pick one up? I'm dying here
without the schematic for this lamp control board.

Like I said, I have the R90 lamp board schematic. It may or may not be
the same as what you have.

On Apr 3, 11:07*am, Ken Layton wrote:
Like I said, I have the R90 lamp board schematic. It may or may not be
the same as what you have.

Well, I finally found the manual part number:

Operations Sequence and Schematics (part # 3-65355-12)

Anyone have one they would like to sell????

On Apr 3, 12:54*pm, elkridge pinball wrote:


Well, I finally found the manual part number:

Operations Sequence and Schematics (part # 3-65355-12)

Anyone have one they would like to sell????

That's the part number of the R90 Shop Manual that I have. It has 73
11 x 17 pages that are double sided!

The lamp driver stuff is only two pages: a schematic on one page and a
parts list on the other.

On Mar 26, 10:43 pm, elkridge pinball wrote:
Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201).

I need to make some repairs and the manual only shows a picture of
one. It appears a light fixture shorted out at one time and someone
tried to "repair" the board, with no luck. Ihave located the light
issue, now I need to repair the board.

Any help is appreciated.

Is this the one that drives the 15w 120v bulbs ?

If it is, be very very careful, as the entire circuit floats at mains
potential (transformerless). The logic voltage is derived from a large
chain of resistors forming a voltage divider

(I would give Rowe a 0/10 score for this design, as they could have
powered the logic from the 8vdc /28vdc bus throughout the machine
instead)

IIRC The bulbs are driven by an SCR with a parallel diode facing in
the opposite direction

The reverse diode allows the bulb to be on on for 50% of the mains
cycle (50% of the time) to act as a "poor mans dimmer", (very illegal
too by state electricity board regulations as this method allows DC to
flow in the system which will over time corrode earth stakes, metal
underground pipes etc, not to mention an annoying flicker in the
lights - at 50hz mains), while the SCR turns on the lamps for the
other 50% of the mains cycle (giving full brightness) as required by
the logic IC's to give the flashing effects to the beat of the music.

If there has been a short circuited lamp holder, check both the diode
and the SCR on that channel for damage, better still replace both of
them. Other parts of the board shouldn't be affected.

Again, and I repeat - BE CAREFUL, - the entire board is NOT isolated
from the mains supply, and any part of it (including the logic IC's
etc) can possibly be at mains potential and give you a nasty shock
(and probably do further damage) if you touch it when plugged into the
mains.

Also too, on many of these machines the red "crimp" terminals used in
mains lighting harness are starting to decompose and crumble away,
exposing bare mains wiring underneath. Sometimes just touching or
tapping them will make them disintegrate. I would strongly advise
removing these and replacing them to avoid the risk of electrocution
and more short circuits happening.

On Mar 27, 12:20*am, kreed wrote:
On Mar 26, 10:43 pm, elkridge pinball wrote:

Looking for the schematic or component layout for an Rowe R-92 Lamp
Control Board (40821201).

I need to make some repairs and the manual only shows a picture of
one. *It appears a light fixture shorted out at one time and someone
tried to "repair" the board, with no luck. *Ihave located the light
issue, now I need to repair the board.

Any help is appreciated.

Is this the one that drives the 15w 120v bulbs ?

If it is, be very very careful, as the entire circuit floats at mains
potential (transformerless). The logic voltage is derived from a large
chain of resistors forming a voltage divider

(I would give Rowe a 0/10 score for this design, as they could have
powered the logic from the 8vdc /28vdc bus throughout the machine
instead)

IIRC The bulbs are driven by an SCR with a parallel diode facing in
the opposite direction

The reverse diode allows the bulb to be on on for 50% of the mains
cycle (50% of the time) to act as a "poor mans dimmer", (very illegal
too by state electricity board regulations as this method allows DC to
flow in the system which will over time corrode earth stakes, metal
underground pipes etc, not to mention an annoying flicker in the
lights - at 50hz mains), while the SCR turns on the lamps for the
other 50% of the mains cycle (giving full brightness) as required by
the logic IC's to give the flashing effects to the beat of the music.

If there has been a short circuited lamp holder, check both the diode
and the SCR on that channel for damage, better still replace both of
them. *Other parts of the board shouldn't be affected.

Again, and I repeat - BE CAREFUL, - the entire board is NOT isolated
from the mains supply, and any part of it (including the logic IC's
etc) can possibly be at mains potential and give you a nasty shock
(and probably do further damage) if you touch it when plugged into the
mains.

Also too, on many of these machines the red "crimp" terminals used in
mains lighting harness are starting to decompose and crumble away,
exposing bare mains wiring underneath. *Sometimes just touching or
tapping them will make them disintegrate. I would strongly advise
removing these and replacing them to avoid the risk of electrocution
and more short circuits happening.

Thanks for the great explanation, learned a bunch!!

The number on the board is 61022901, ckt bd assy - lamp control

I'm looking at the board now, I see an obvious burn mark on one side
of the 3 pin molex power plug (side opposite fuse) and a burn mark
across 3 of the resistors in the voltage divider network. Almost
looks like something may have shorted to the case at the resistors.

It also appears the 3 SCR's were replaced at one time, (bad solder
job!) and the fuse holder itself. No other obvious repairs.

Thanks again....

Success, kind of!!!!!

Resoldered bad connections, and replace 2 diodes that were shorted,
plugged everything in and lights came on (at least the ones that are
there !!!!!

The lights do the flash to the music however, the are at half
brightness and go full when I move the selector switch, but never
flash.

Where does the brown/black wires go? I see the shielded pair goes to
the amp, but not sure on the other two???

Thanks kreed for the helpful inf!!!