Jump to content


Member Since 02 Dec 2004
Offline Last Active Oct 07 2015 02:55 PM

Posts I've Made

In Topic: X4000

06 October 2015 - 09:55 AM

It seems to be class AB. Not D or I!


In Topic: CT-400 not working properly

03 September 2015 - 12:09 PM

Thanks for the info! I wasn't aware of these intricacies with the transformers. Good to know.


In Topic: CTS1200 Problem

03 September 2015 - 12:06 PM

Good job! Can you tell me about the[LVA] transistors located at the right of the main, behind the Ch1 heat-sink, seen from the front. You will notice a string of transistors. If these transistors are MPS42 or MPS92 (no 'W'!), replace these transistors for MPSW42 and MPSW92; Also, replace R428 and R466 with new resistor, 649 Ohm. If these 'W' transistors have been properly installed, then no need for replacement.

Please advise.


In Topic: CTS4200a dead

18 August 2015 - 10:25 AM

TY for the update! This psu may be a great replacement for the original LVPS. Let us know if the psu does act up, eventually! :)


In Topic: Crown 5002 Bias

03 August 2015 - 01:20 PM

Determine if the fault lies with the PNP or NPN board. You can swap boards with the good side. Once you've identified the problematic board, then you will be able to determine the defective component section. I've seen on the NPN board resistive caps. It is possible that the error amp (U503) may be defective or has a bad biasing (check the resistor network).

Good luck!