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02-01-2026, 06:03 PM
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Help Understanding ACC
I'm trying to adjust ACC on my 25EC58 chassis and I don't know if the values I'm seeing are correct and the SM doesn't say what voltage I should see, or at least a range. When I follow the procedure, I'm supposed to be in align mode, then short two pins and read voltage from another pin (chroma board). From there I remove the short and adjust the ACC pot until the voltage I'm reading matches what I saw when the pins were shorted. However, if I look at the schematics for the boards, the two pins to short are ACC pins with voltages of 8.7V and 8.55V. The point to be measured is the burst line and it shows 11.7V. When I take my reading shorted, I get 17.6V and I adjusted unshorted for that same voltage. Is this correct? I'm not sure if the voltage is supposed to be that high, seeing as how the schematic voltages are well below that point.
Anyway, just trying to figure out if 1 of the 2 boards where tint is might be bad. The burst leaving the chroma shows as 11.7V going to the subcarrier module. If I'm reading 17.6V, then isn't that out of spec?
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Pioneer SX-1080, Pioneer PL-115D, Pioneer CT-F9191, Pioneer RG-1, Wollensak 8050A, Akai 4000DS MkII, Pioneer CS-05 & Polk 1.2TL Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650 Last edited by TinCanAlley; 02-07-2026 at 04:11 PM. 
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