• 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

CR-450 idle adjust

G

gjcr5121

New Member
Hi Everyone,
I am trying to set the idle current on a Cr-450. 50 mV on left and right channel as per service manual.
However I can only set it on the right channel. Right channel is ok at 50 mV. Turning the trimpot on the left channel changes nothing, it stays steady at 0 mV.
What could be the cause of this? faulty trimpot or resistor?
Could this be related: both channels have output but right channel is louder than left channel. When I turn the balance to 09.45 it is in the middle.
Main amplifier was recapped and retransistored and changed trimpots too.
G.
 
Register to hide this ad
What transistors were replaced and their replacements?
Measure dc voltage between bias TP1 and chassis/GND, repeat for TP2 and GND, should be +/-xxxmV.
Does left channel sound distorted or sounds ok, maybe check/measure resistor R535 and R537 in circuit
ok, expect about 10ohms Important measure with amp powered off/unplugged.
 
Also check emitter resistors R539 and 541.. .47Ω @ 2 watt
 
You must log in or register to reply here.
Back
Top Bottom