Old Sony MHC 1600 - Page 3

gmphadte · 1st February 2012, 04:24 AM

STK4232 has a mute pin.

Gajanan Phadte

gmphadte · 1st February 2012, 08:22 AM

I missed this one.

The motor of the volume control is driven by LB1639 (IIRC) and the two control logic inputs at pin 1 and 4 are driven by the microcontroller annotated as IC301 on the front board.

Gajanan Phadte

hoonie · 3rd February 2012, 02:38 AM

Hi all,
I also have a MHC-1600 that I used for years in the 90s and as late as 2010 and then packed it into storage. I just tried hooking it up again but there is no sign of power whatsoever. Does anyone know what I can do? Is there a simple fuse I can change?

gmphadte · 3rd February 2012, 03:19 AM

If the fuse is blown.

Open the back cover and the top cover. IIRC, there is a fuse on the pcb on which the power connector is fitted.

KEEP THE MAINS CHORD DISCONNECTED ALL THE TIME WHEN THE STEREO IS OPEN.

Gajanan Phadte

hoonie · 13th February 2012, 07:20 PM

Thanks, gmphadte,
It does not seem to be a blown fuse.
Is there anything else I can try. Visually nothing looks broken or burned out.
Thanks for your help.

gmphadte · 14th February 2012, 09:28 AM

Now u have to check the power supply and the fuses on the secondary side. The voltages r normally written on the pcb.

I think u better start with soldering the cracked and dry solder points.

Gajanan Phadte

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1st February 2012, 04:24 AM	#21
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	STK4232 has a mute pin. Gajanan Phadte

1st February 2012, 08:22 AM	#22
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	I missed this one. The motor of the volume control is driven by LB1639 (IIRC) and the two control logic inputs at pin 1 and 4 are driven by the microcontroller annotated as IC301 on the front board. Gajanan Phadte

3rd February 2012, 02:38 AM	#23
hoonie diyAudio Member Join Date: Feb 2012	Hi all, I also have a MHC-1600 that I used for years in the 90s and as late as 2010 and then packed it into storage. I just tried hooking it up again but there is no sign of power whatsoever. Does anyone know what I can do? Is there a simple fuse I can change?

3rd February 2012, 03:19 AM	#24
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	If the fuse is blown. Open the back cover and the top cover. IIRC, there is a fuse on the pcb on which the power connector is fitted. KEEP THE MAINS CHORD DISCONNECTED ALL THE TIME WHEN THE STEREO IS OPEN. Gajanan Phadte

13th February 2012, 07:20 PM	#25
hoonie diyAudio Member Join Date: Feb 2012	Thanks, gmphadte, It does not seem to be a blown fuse. Is there anything else I can try. Visually nothing looks broken or burned out. Thanks for your help.

14th February 2012, 09:28 AM	#26
gmphadte diyAudio Member Join Date: Jul 2003 Location: Dona paula, Goa	Now u have to check the power supply and the fuses on the secondary side. The voltages r normally written on the pcb. I think u better start with soldering the cracked and dry solder points. Gajanan Phadte

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