• 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

Hitachi HA-610 rebuild question

C

Chazzman72

New Member
I have gotten hold of my father's Hitachi HA-610, the receiver I abused when I was a teenager. It is in excellent working condition, but wanted to rebuild it. After cleaning and lubing all the contacts on it, I replaced all of the electrolyric capacitors. I have two questions:
1. The power green power LED is not functioning, and I am wondering what part I need to replace it.
2. Should I replace the transistors mounted on the heat sinks, or leave them be?

Any advice on these questions, or any other points I should look at with this receiver is appreciated.
 
Register to hide this ad
Page 5 of the service manual " Adjustment of idle current " ( bias ) Check and verify/adjust for proper bias of the output transistors.

Caution : Heed the warning stated in the procedure.;)
 
avionic said:
Page 5 of the service manual " Adjustment of idle current " ( bias ) Check and verify/adjust for proper bias of the output transistors.

Caution : Heed the warning stated in the procedure.;)
Click to expand...
I do not have access to a service manual for this unit.... would definitely appreciate if anyone could direct me to it. Are there adjustments I should be making/checking after replacing the capacitors?
 
Chazzman72 said:
Are there adjustments I should be making/checking after replacing the capacitors
Click to expand...

Only the bias check/adjustment for both channels.

avionic said:
Page 5 of the service manual " Adjustment of idle current " ( bias ) Check and verify/adjust for proper bias of the output transistors.

Caution : Heed the warning stated in the procedure.;)
Click to expand...
 
avionic said:
Should see approx. 2 vdc across that LED.
Click to expand...
There was 5.4VDC across the two board pins that fed that green power LED. Pretty sure I need a new green power LED, just wondering how hard it is to find a replacement that will friction fit through the face like this one?
 
avionic said:
Only the bias check/adjustment for both channels.
Click to expand...
I reassembled and looked up the "adjustment of idle current" going to take me a bit to decipher exactly where they want me to take those reading from. Don't worry, I am used to adjusting pots on arcade monitors, have many non-conductive adjustment tools here.
 
You must log in or register to reply here.
Back
Top Bottom