ifr 1600 problem

[CircleBat]

Have an ifr1600 that won't fire up..just hear the relays clicking when pressing the on/off switch.. what could be the problem? any schematics on the power supplies?

Greatly appreciate any help

circlebat

[Wowbagger]

If you are hearing no beeps at all, I'd suspect the power supply. Finding schematics will be a problem, as the military version (AN-GRM 4317) caused all the docs to become ITAR controlled.

But as a Hail Mary, you can open the case and re-set all the digital boards and see if that helps.

[jry]

there are two supplies in the military versions that I have worked on....actually three if you count the DC input which is not on most of the commercial versions.
One that is the standby supply ( powers yellow light and enables the power range switching and on-off control etc )
The heart of the main supply is a standard switching regulator IC . You can use the data sheet as a starting point for the "schematic" ( forget the PN but its a common one )
Typically the caps fail ( as usual ) . I have seen cap failures on both the standby board as well as the main supply.
The supply can be removed and serviced ...on-off is just a ground to one of the pins. Parts are readily available .
Lots of screws and be careful to route the wires on re-assembly so the internal fan does not get jammed by them.

Sounds like the main power supply board ...check the small startup cap by the switching regualator IC


Good Luck

John

[richardbritt]

I am having the same problem except mine comes on intermittently. When it does come on, all the internal tests run fine and all functions work. It will stay on as long as there is power to the unit. Then it will stay off until I power the 120VAC to the unit on and off a bunch of times. This just started happening the last 2 times I tried to use it. I used to work as a cal tech repairing military electronic test equipment (Tektronic 492 for example) but never had to open one of these up. I loosened all the captive screws in the back and all 4 Torx screws on the back. Unit does not want to open. Am I missing something?

Also, one more symptom I am having is when it does power up now, the internal fan does not run (it did until this problem started)

Thanks

Richard (I am not a business but got this mil surplus several years ago)

[jry]

same comment as above.
Sounds like the small capacitor for the PWM IC is failing. This is used to provide the filtered power to the PWM IC from the mains through a resisitor and diode.
Not sure on the fan other than the fan itself failed ...could be the bearings have gotten worn or corroded enough that there is not enough torque in the motor to spin up anymore. These are getting on in years ( like most of us ) and the mechanical parts will fail eventually. Luckily this should be a standard part as well.

[jry]

same comment as above.
Sounds like the small capacitor for the PWM IC is failing. This is used to provide the filtered power to the PWM IC from the mains through a resisitor and diode.
Not sure on the fan other than the fan itself failed ...could be the bearings have gotten worn or corroded enough that there is not enough torque in the motor to spin up anymore. These are getting on in years ( like most of us ) and the mechanical parts will fail eventually. Luckily this should be a standard part as well.

[richardbritt]

Thank you. I did get the unit apart last night and reseated all the boards that unplug and cleaned the connectors and also reseated all the ics in sockets. I put it back together and it came right up (fan is working now too).

Where is that cap located? I might try to replace it in case its leaky.

Thanks again

/r

Richard

same comment as above.
Sounds like the small capacitor for the PWM IC is failing. This is used to provide the filtered power to the PWM IC from the mains through a resisitor and diode.
Not sure on the fan other than the fan itself failed ...could be the bearings have gotten worn or corroded enough that there is not enough torque in the motor to spin up anymore. These are getting on in years ( like most of us ) and the mechanical parts will fail eventually. Luckily this should be a standard part as well.

[jry]

sounds like you have the commercial version of the 1600 and not the TS4317 military version.
The commercial version power supply sounds completely different but less complicated without the DC input and auto-ranging.
If you can locate the main PWM IC there should be a small cap located nearby if its a similar design.
Like the monitor/CRT believe the power supply was made by one of the main switching supply manufacturers and the schematic may be around.

[richardbritt]

Its a TS4317. This I am sure of 100%. Surplus via DMRO.

I'll check for the cap and see if I can locate it. Thank you for the idea.

Its working most of the time now, only fails to come on now and then, then I turn off my power strip to it, then cycle the power and it comes right up again.

I used to have copies of the Army manuals on CD for this unit (both the user and service manuals - there are 2 of them for service). The military version of the manuals breaks it down better than the commercial manual (I paid around $200 for the IFR version in print).

Have a safe New Year

/r

Richard

[jry]

do not remember any socketed components on the TS4317 power supplies I have worked on.
There was four PC boards internally and a million screws
.output board which had the connectors into the wiring harness and mostly internal connections with a few filter componets.
Main Power supply board
DC in board - convert the 14VDC to 200VDC - this is optional
Standby board -had the power supply to turn on the yellow & GRenn LED , switch the main power supply to the correct AC input range and provided On/Off plus the fan power. have seen the caps fail on board as well

Would be great to get the files for the TS4317 service manual . Used an IFR1900 SM to work on these. Not many details in the commercial version manuals ( like schematics ) but the information did help with high level trouble shooting