1959 MIRROR-MATIC technical page (...)
I just bought a '59 Mirror-matic (thanks Bob L. ) and i'll install it on my '57 ... yes, i know, no mirror-matic in 1957 but, but .. Note that the # number is 1902066 on the bezel (and 1902068 on inside of the cover). General infos and messages about Mirror-matic at this page.
My goal is to have a working mirror and not a "trailer queen mirror" !!!
But in the dark or in front of a 100W lamp the mirrors stays on # 2 position (dim) ... Seems it needs some adjustement. Other tests:
I decide to take it appart (i've some electronic knowledges..). How to ? See FSM (no errors):
make some repairs or adjsutement, i need a schematic but no schematic glued on
the back of the cover as on radio !!! Fortunately the schematic is easy to trace
so i draw it (see pic, click to enlarge) after some hesitations:
the square potentiometers plate is in reality 2 potentiometers but also 2
resistors engraved on ceramic (?).
I took some measurements
. Remember, the values of resistors which are
on the schematic are the values i've measured with a multimeter and not the
factory values !
30/6/2003 - Conditions of test: mirror feeded with + 12 / position : "city" / mirror glass on the bench (cell in the dark ..) / as described at the beginning, after 15 s mirror is in (non correct) "dim" position
After some "no result" tests i decide to fully "out-of-align"
the "city" potentiometer (easier because ther's only 1 potentiometer in this
position, the other is grounded). Near the extreme end of the travel (lower
resistor) the mirror goes to "realease" ! I measure at "A" (see
schematic) the voltage = 1.7 V. I turn a little the potentiometer to increase resistor, immediatly the mirror
switches to "dim". 2.5 V at A.
The adjustement range of the potentiometer is extremely small, perhaps 1/10 inch .. I think that potentiometer values have changed and increased a lot. To have the 1.7 V, with some arithmetics, you find that the resistor of P1 must be 25 K (i measure the value: around 30 K) and i've a 700 K potentiometer ... I'll solder a resistor (50 to 100 K) in parallel with P1 to have a larger range of adjustement.
I make the same test with "highway": same conclusion, P2 is still higher than P1 ! I made some other tests and it seems that the critical value of "A" voltage is around 1.9 V. At this value itsn't sure that mirror "releases" at each time.
So i must set the A voltage to 1.7 to 1.8 V in "highway"position (it's the most sensitive position) and to a lower value in "city" position. Problem is to make the right adjustements because you can't adjust with mirror in the car at night (and your friend who follows you in another car with headlights on !)
01/07/2003 - second
test. Condition of test: same as 30/6. I solder a 39 K resistor
in parallel with each potentiometer and test the mirror. Strange,
voltage at "A" are different than yesterday ! Sometimes i read 1.4 V, then 1.1
then 1.9.. It seems that the voltage isn't steady. And every time i adjust P1
(or P2) the voltage becomes odd, i.e if i decrease P1 the voltage sometimes
increases sometimes decreases ...
The only fact is that the system goes to "dim" when you've 3 V at grille (0.5 V less than at the cathode). Other fact, the resistance of the cell in the dark is 60 K WITH the 12X5 tube on socket (and no voltage supply ..). I'm WRONG ! I've the filament of the tube in // with the cell ! If you remove the tube, the correct resistance is around 10 Mo !!
so, How Chrysler adjusted the Mirror-Matic ?
01/07/2003 (night) - 3rd test. I wait until the night to test the mirrormatic. I put the unit at the far end of my garage and drive my Buick ahead of it (at 10 meters or 30 feet). The mirror works well but only if the car is in high beam. If i switch to low beam, the unit works in "highway" position" (not every time) and not in "city" position. Seems that i 've too cushioned the cell with the two 39 K resistors.
02/07/2003 - 4th test. I remove the two 39 K and put in place a 82 K (// with P1) and 100K (// with P2) . I adjust the potentiometer to have a equivalent resistor of 45 K for P1 and 70 K for P2. The unit seems more sensitive, if ther's some (exterior) light in my workshop the unit (in "highway") switchs immediatly to "dim" and doesn't released until i hide the cell. I must wait until night to test like yesterday.
02/07/2003 (night) - 5th test . Last test (?) the mirror now works like a charm but i must test it on the road. So i install it in the car (need a small hole in the base for the wire). The wire is connected to "H" pin of the headlight switch (Hi-Lo beam) . I insert a 4 A fuse in the wiring ..
To be continued ....
Click to enlarge
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