Hello Friends;
I recently purchased a second hand 10 amp, 24 v. Schauer battery charger in "as is" condition and am now attempting to repair it. The silicon controlled rectifier was marked "bad" and had been clipped out of the circuit. (see attached schematic). This left the charger as a non-automatic, non voltage controlled unit requiring the use of a timer on the AC supply for safe charging. I have purchased a new rectifier and pop-riveted it to the heat sink assembly at the back of the charger.
The old SCR had a scrap of blue wire still soldered to one terminal leaving me in no doubt as to that part of the reinstallation. I have soldered the blue wire which connects to the C2 capacitor of the control circuit board to one terminal of the new SCR. (see attached photos). From examining the old SCR, it's clear that there was a heavier gauge wire soldered to the other terminal. I'm not sure where this wire led and am flummoxed when it comes to this part of the hook-up. Here's what I don't understand: What is the schematic actually telling me about the re-wiring of the new SCR? In examining the actual wiring of the charger, it appears that the DC from the diode rectifiers is fed directly to the heat sink plate at the back of the charger. (top left in photo). From the heat sink, there is a heavy black wire which, when I bought the charger, was connected to the ammeter and on out of the charger to the + battery clip. From examining the schematic, I'm guessing that maybe the SCR is electrically connected to the heat sink by it's mounting stud and that the connection from the SCR to the ammeter shown on the schematic is this heavy black wire. On the other hand, my admittedly amateur reading of the schematic would lead me to believe that the connection from the SCR to the ammeter uses a terminal on the SCR, not the heat sink. HELP !!!
pc
I recently purchased a second hand 10 amp, 24 v. Schauer battery charger in "as is" condition and am now attempting to repair it. The silicon controlled rectifier was marked "bad" and had been clipped out of the circuit. (see attached schematic). This left the charger as a non-automatic, non voltage controlled unit requiring the use of a timer on the AC supply for safe charging. I have purchased a new rectifier and pop-riveted it to the heat sink assembly at the back of the charger.
The old SCR had a scrap of blue wire still soldered to one terminal leaving me in no doubt as to that part of the reinstallation. I have soldered the blue wire which connects to the C2 capacitor of the control circuit board to one terminal of the new SCR. (see attached photos). From examining the old SCR, it's clear that there was a heavier gauge wire soldered to the other terminal. I'm not sure where this wire led and am flummoxed when it comes to this part of the hook-up. Here's what I don't understand: What is the schematic actually telling me about the re-wiring of the new SCR? In examining the actual wiring of the charger, it appears that the DC from the diode rectifiers is fed directly to the heat sink plate at the back of the charger. (top left in photo). From the heat sink, there is a heavy black wire which, when I bought the charger, was connected to the ammeter and on out of the charger to the + battery clip. From examining the schematic, I'm guessing that maybe the SCR is electrically connected to the heat sink by it's mounting stud and that the connection from the SCR to the ammeter shown on the schematic is this heavy black wire. On the other hand, my admittedly amateur reading of the schematic would lead me to believe that the connection from the SCR to the ammeter uses a terminal on the SCR, not the heat sink. HELP !!!
pc
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