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joust

Member Since 02 Dec 2004
Offline Last Active Aug 18 2015 10:20 AM
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Posts I've Made

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! :)

Alain

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!

Alain

In Topic: Firmware update Xti 4000

08 July 2015 - 12:55 PM

Google XTI "Firmware update for older XTI" and peruse the email.
Download the XTI113311.zip file included in the email.

A.

In Topic: Strange Fault On A Crown K1.

02 July 2015 - 09:11 AM

Depending on the age of the amp, it may need a full refurbishment. Yes, the ULOL adjustment should be verified and readjusted. Also, remove the output modules [by a qualified technician] and re-solder all suspicious connections. Remove the display board and also re-solder all connections. Basically, disassemble the amp and redo all suspicious connections!
Note : Looks like the amp is in Bridge mode; If the amp is in Bridge mode, the Ch2 volume knob will not work (review the manual). In Dual mode, both channel controls should work.

In Topic: Crown XTI 2000 not booting

26 June 2015 - 11:19 AM

The SMPS has only one [AC] reference : TP21. Beware! This is not a referenced Ground! This is considered the 'reference' to all SMPS primary voltages. In the Secondary section, the reference is 'ground'. DO NOT ground any electrical equipment TO THIS

Note : Across C201, there should be around 60K; If you have only 1,8K :
- Remove and measure C201 : If low, replace (.1uF, 50V); Re-install and power up; If booting up, finished!

If it doesn't power up :
- Remove R375 (1K); This will decouple the regulator circuit and re-measure across C201; If resistance is high : Issue with regulators;
- Power up and measure 16V; If voltage is low, verify U16 and FAULT circuit;

I hope this helps!

A