• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Is this part a fusible-link

A

ampman

AK Subscriber
Subscriber
Hi,
I am working on a SG-9800 Equalizer and have a question on a couple parts.

This unit does not have a fuse in the circuitry. The unit does have two resistors in line with the rectified power before the regulation circuity.

The initial issue was a burnt resistor (R902). This led to discovering burnt transistors in the power supply.
The resistors are R901 (5.6 ohm @1/2W) and R902 (6.8 ohm@1/2W). The description/designation of the parts is "RD 1/2 PSF xxx J". These parts are listed as critical safety parts to be replaced with exact like parts.

Are these components actually fusible resistors that are the fuses(protection) for the unit? I think so but want to verify with those that know more than I do.

Thanks.
 
Register to hide this ad
Normally somewhere in the manual is a key that describes the acronyms for resistors and capacitors. It may provide more detail for what resistors are Fusible vs Flame Proof.
 
jd3rdcoast said:
Normally somewhere in the manual is a key that describes the acronyms for resistors and capacitors. It may provide more detail for what resistors are Fusible vs Flame Proof.
Click to expand...
Hi,
Thanks for the suggestion. Appreciate the help.

I have read the legends in the service manual (have copies of the original). The manuals do not clearly define the terminology, so I ask for help in identifying them. Hoping someone that was around then would see the post and answer.
 
avionic said:
Likely. Look at the schematic legend for reference symbols. Or the parts list. Hopefully you used flame resist for the two burnt resistors.
Click to expand...
Hi,
Thanks for the suggestion. Appreciate the help.

I have read the legends in the service manual (have copies of the original). The manuals do not clearly define the terminology, so I ask for help in identifying them. Hoping someone that was around then would see the post and answer.

I have an automotive repair tech and manufacturing engineering background. I used a 10-amp circuit breaker to simulate the blown part. The circuit breaker did not pop instantly but close enough for me to look deeper for the issue. That's when I found the blown transistors.
 
jd3rdcoast said:
PSF = Flame Proof

This link from Pioneer Guru Mark the Fixer is where I found the answer by searching "PSF" in Pioneer Forum. Replace with same Flame Proof rated resistor.

Here is a link to a thread that has information on Pioneer resistor coding.
Click to expand...
Hi,

Thanks. Appreciate your efforts.

I did search for the entire part number. Did not think to search for the individual portions.

Thanks for helping me learn.

Thanks all.
 
You must log in or register to reply here.
Back
Top Bottom