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joust

Member Since 02 Dec 2004
Offline Last Active Mar 25 2015 08:14 AM
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Posts I've Made

In Topic: Crown XTI 2000 not booting

25 March 2015 - 08:17 AM

The voltage should be more like 170V. Verify the Bulk caps voltage for ripple. Be wary of the PTC resistor in the SS relay.
Verify the two relays in the SMPS circuit : one is for the doubler and the other should be for the soft start. Before the LVPS can come on line, we need that the two relays engage. We already know that the 3.3V and 5V lines are present. That means U1 should send the two signals for the relays. Verify pins 32 and 36 : Both should be high and should activate the relay circuits.

In Topic: rewiring D75 from 120v to 240v

25 March 2015 - 08:10 AM

It is possible that a version of the 'american' amp had the 120V only transformer installed.
Perhaps for international distribution (that includes Canada) the transformer was installed for both voltages.

Alain

In Topic: D-75 IOC light stays on

25 March 2015 - 08:07 AM

You are so welcome! Also, all you guys are great! You give us great impetus to continue!

Alain

In Topic: D-75 IOC light stays on

23 March 2015 - 08:44 AM

Pins 13 and 14 are the comparator's output. Pins 10 and 11, pins 8 and 9 are the comparator's inputs;
Since inputs appear the same for both units, the config. 1 appears faulty (compared to config 2).
You don't mention pin 3 (LV+) while 12 is (LV-) -10V; I suspect pin 3 should be +10V (ref to ground).
On the good working amp comparators inputs give correct output results.

Alain

In Topic: rewiring D75 from 120v to 240v

23 March 2015 - 08:33 AM

Take a look at Fig. 2 of the operations manual. It explains the different combinations that the power transformer can take.
Do you have an original owner's manual?

Please advise.

A.