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I have exactly the same problem with my 4600CL as the two respondents below. (GreekG91 and noscgag) It was working perfectly before I went to Europe for six months, during which time the battery went flat, giving me the "no resistance" condition and a non-working consul. I did a slow recharge of the battery and it responded well with a constant reading of 6.6 volts, steady over 24 hours. I cleaned the terminals. When I put the battery back into the machine, the consul now appears to be working normally, but I have gone from "no resistance" in the pedals, to "constant Level 1 resistance", no matter what I set the intensity level to on the consul, for any of the programs. The programs cycle through normally, but the pedal resistance does not change as the program progresses. Any suggestions on how I can fix this problem?
I have 4600 cl and no resistance problem. Changed the brushes on alternator, now changed the pc board and the battery and still nothing. Any ideas / help please?. Thanks. Ash
I have an issue with too much resistance. Whether the intensity level is at 1 or 20, it stays at the same resistance level (which is probably a 1). Can you assist me in troubleshooting this issue?
+GreekG91 I had the same problem with my 4400 CL - constant resistance. The alternator was working fine, the battery was fine, and the big load resistor was fine. All the connectors were plugged in. I finally did a visual inspection of the lower PC board (the one near the alternator) and found a cold solder joint for diode D10, a 1N5349B 12V 5W Zener. After removing it and testing it I found that it was shorted completely through (acting like a wire instead of a diode). I replaced that and it works again.
+noscgag I spoke too soon. Turns out the there was an additional problem. Transistor Q6 (a TIP105 Darlington transistor) was fried, the collector and emitter were shorted. I've ordered a replacement, so hopefully that will fix it.
+Gary Gilbreath Well, of course that didn't fix it, but it was closer. After replacing the diode and transistor, the resistance would vary, but after 2 - 9 minutes the console would reset. I took it apart again and checked the other components. I found that the 15 W 20 ohm resistor (R16) between Q7 (TIP36C) and Q3 (RFL1N08) was open (infinite resistance). After replacing that, it works fine again.
