Case 346532. 02/12/24 Pioneer SX-780. Makes loud pop sound after turn on and relay clicks 2-3 times. Sound is ok.
Bad capacitor 33ufx16v next to protection relay.
Category: Uncategorized
Case 4375644. Marantz 250 amp. No sound after 5-10 minutes.
After closer look found oxidation on protection relay contacts. Cleaning doesn’t help for long run. Relay replacement solved the problem permanently.
Case 567532. 03/01/2023 . Pioneer QX-9900 receiver . Right channel distorted like thunderstorm noise .
After troubleshooting using ” freeze spray ” for transistors method found 2 transistors 2SA726 in right channel driver board acting bad after cold application . All unit transistors 2SA726 changed to 2SA992 . They have same look but different pinout. Pay attention ! 2SA992 / KSA992 is better in parameters and performance.
