SonyMHC 2500 - UK Vintage Radio Repair and Restoration Discussion Forum

Chris 1155 · 7th Jan 2022, 6:29 pm

I have a Sony MHC 2500 which I bought new about 35 years ago.
It has been unused for some time and upon resurrection it displays two faults.
1. When the CD deck is activated it sometimes take about 15 mins before the deck becomes active or shows any signs of life.
2.Initially the CD player accepts a disc and then plays without fault. Usually when the second disc is inserted the CD draw sometimes refuses to close or it closes and then opens again. If power is removed for about two hours the sequence of acceptance and the rejection starts all over again.
When working the system is very good but the faults mentioned make it unusable for domestic use.
Any ideas?

JonSnell · 7th Jan 2022, 7:08 pm

I would firstly check the power supply voltages are correct value and smooth, you may find a few dry capacitors, then replace the CD loading belt.
Service manual is here; https://elektrotanya.com/sony_str-h1.../download.html

Chris 1155 · 7th Jan 2022, 7:45 pm

Thanks Jon, I will look at that.

Chris 1155 · 12th Jan 2022, 10:48 am

Good Morning John, I have replaced several suspect electrolytics and cleaned all the connectors. I have also cleaned the disc transport tray limit switches. The drive belt seems to be in good order.
The system appears to be working very well now, lets hope it lasts.
Thank you for your advice.
Regards
Chris.

7th Jan 2022, 6:29 pm	#1
Chris 1155 Tetrode Join Date: Dec 2017 Location: Reigate, Surrey, UK. Posts: 65	SonyMHC 2500 I have a Sony MHC 2500 which I bought new about 35 years ago. It has been unused for some time and upon resurrection it displays two faults. 1. When the CD deck is activated it sometimes take about 15 mins before the deck becomes active or shows any signs of life. 2.Initially the CD player accepts a disc and then plays without fault. Usually when the second disc is inserted the CD draw sometimes refuses to close or it closes and then opens again. If power is removed for about two hours the sequence of acceptance and the rejection starts all over again. When working the system is very good but the faults mentioned make it unusable for domestic use. Any ideas?

7th Jan 2022, 7:08 pm	#2
JonSnell Hexode Join Date: Oct 2019 Location: Weymouth, Dorset, UK. Posts: 476	Re: SonyMHC 2500 I would firstly check the power supply voltages are correct value and smooth, you may find a few dry capacitors, then replace the CD loading belt. Service manual is here; https://elektrotanya.com/sony_str-h1.../download.html __________________ Valve equipment repairs since 1968 https://jonsnell.co.uk

7th Jan 2022, 7:45 pm	#3
Chris 1155 Tetrode Join Date: Dec 2017 Location: Reigate, Surrey, UK. Posts: 65	Re: SonyMHC 2500 Thanks Jon, I will look at that.

12th Jan 2022, 10:48 am	#4
Chris 1155 Tetrode Join Date: Dec 2017 Location: Reigate, Surrey, UK. Posts: 65	Re: SonyMHC 2500 Good Morning John, I have replaced several suspect electrolytics and cleaned all the connectors. I have also cleaned the disc transport tray limit switches. The drive belt seems to be in good order. The system appears to be working very well now, lets hope it lasts. Thank you for your advice. Regards Chris.