"MashBrain" wrote in message
oups.com...
Hi _g. beat_
Thanks for the speedy, and informative, reply. Your info was very
helpful. I am not aware to what BAMA refers - could you give me a heads
up?
BAMA is the acronym for BoatAnchor Manual Archive. Boatanchor is the
"slang" term used for old tube-type radio and short wave receivers and
equipment. It was started by Ken Grimm in Lynchburg, VA. It is a valuable
repository for manual of many companies that are no longer in business or
large companies that have exited the electronics industry. Most of this
equipment is 1930's through 1960's
Ken was kind enough to include the earlier Weller information (discontinued
products).
My base is an EC2002M-O power unit. The back sticker displays the
COOPER logo prominently, so I would guess that the base dates from
after the 1980's. It was originally paired with a EC1201A pencil, but I
loaned the unit to a technician and when it was returned several months
later, he said he could no longer find the pencil.
A new EC 1201A pencil cost $ 100, I don't loan my tools -
too many sticky fingers (can't find it ) these days.
Ask him for $100 to replace that iron - and he will find it in a box.
BTW, a new EC1503B iron is $ 130 .. so yes I think it is worth getting fixed
properly.
I assume that your "A" has a white silicon cord (may be only difference)
http://www.wassco.com/welec42wsoli.html
I have a non-functioning EC1503A pencil, so I was trying to get the
station back
in working order by repairing the EC1503A pencil. This lead to my
inspection of the base-unit connector and the discovery of the sixth
pin in the Tyco/Amphenol base-unit connector. (I no longer have the
EC1201A pencil, so I can't determine if it had a sixth pin.) (By the
way - I thought I was pretty observant, but I completely missed the
fact that you pointed out - that two of the pins in the connector -pins
3&4- are gold, while the other four are silver.)
I have not worked on the EC 1503 pencil - it was a high wattage pencil.
Weller is the best to ask about availability for those parts.
Wassco lists a EC263B Sensor Assembly (WAS-02-18901) at $58
That may be the correct part
I usually use Action Electronics or Wassco for many parts orders,
BUT thee are MANY other good dealers / distributors throughout the US.
You can also call Weller for parts directly (use direct number below) - or
they can tell you of local dealer / distributor near you
Cooper Tools / Weller
1000 Lutkin Road
Apex, NC 27502
Toll free number: (800) 476-3030 ext. 2
Direct (919) 362-7542
FAX: (919) 387-2640
Action Electronics (Northern CA)
http://www.action-electronics.com/weller.htm
Wassco (Southern CA)
http://www.wassco.com/ecserreppar.html
Your link to the cooperhandtools manual was helpful, but it does not
illustrate the sixth pin in the center of the connector. Mine has a
(silver) sixth pin in the center of the other five pins. This pin has
a blue wire which connects to the circuit board.
I do have a new wiring harness (EC270) for the station's control board in
front of me (arrived from Weller yesterday). The blue wire is there, I have
removed it for retro-fit repairs.
On earlier EC1002 stations that I have opened up - this wire was cut and not
installed to the iron connector.
The Pace soldering irons (PS-80, PS-90) use the middle pin in the 6-pin DIN
connector -- just like the new WES51 station. I am almost positive that Pace
uses that as a heater connection -- BUT I would have to pull that
documentation up to see how they are wired.
In the PES51 iron (for WES51 station)- that wire is used for the heater (and
pin 1 is blank)
I spend quite a while with a lope to confirm that this pin connects to the
PIC MPU IC on the
circuit board. The schematic of the PIC MPU says that the pin (pin17)
is an I or an O pin depending on the programming of the chip. I have
no way of referencing the program code, so I can't determine whether
this is an input or an output, but I would guess that is used as an
input since there is a 10K (I think) resistor in series with the lead.
(i.e.,base connector pin 6 to blue wire to circuit board to 10K to pin
17 of the PIC processor.)
DVM or VOM (Scope -- if you have one)
One unsupported guess is that this is an
input and that it is used to implement a software zero-crossing
detector to control the TRIAC turn-on point, but, this seems like a
really round-about way to make the connection for a zero-crossing
signal. If you have any ideas, I would really appreciate hearing them.
I am looking at a block diagram of a Weller Thermolock (circa 1987) and
that seems likely. The zero crossing (+/-) firing drives the Gate Driver -
which is interfaced to the charge switch (RTD sensor control) and the Triac.
I pulled out a spare EC271 (EC1002 control board - latest version).
Blue pin goes to a breakout of 2 resistors (10K and 100K) and a capacitor.
The 100K resistor line goes onto larger 3-pin surface mount component:
W0242
MC7805C3
That appears to be a 5 volt voltage regulator,
So the blue lead (through the 100K resistor) goes to the output lead on the
regulator,
the center pin is cut (no connection)
and the input lead goes through diode (looks to be 1N4001) and
100 ohm resistor -- this ends up at 24 VAC feed from Red wire (24 VAC
secondary) of transformer in base unit. (This is also the lead to pin 1 on
the base's front connector for iron).
Looks like pin 1 is for temperature compensating?
I guess my real question at this point is, do you think fixing the
EC1503A pencil (replacing the RTD) is a way to go here? Do I need to
worry about the center pin at all? My other soldering station is a
cheapo Unger, and I really miss the Weller.
YES, a new EC1503B iron is $ 130 .. I think it is worthwhile getting fixed
properly.
If the heater is OK and you are sure that the 2002 base unit is OK (you can
read the voltages in the 2002 manual for troubleshooting to verify)
The RTD, as you see is a significant cost (1/2) of the overall iron's cost.
Ungar made some good stations. Parts for these are still available - Action
Electronics in California was one of Ungar largest west coast resellers in
1990s (they have good knowledge of parts and service for them).
g. beat