Rowe/ami cd100a amp problems

[ddb89quad]

I have a Rowe/ami cd100a jukebox and the left channel is bad(keep taking the 8A fuse).  I've heard that I need to replace some of the caps.  If this is true does anyone know which ones?  If not has anyone had this problem.  Does anyone know of a good place to send amps to get fixed?  I'm new to the jukebox world but ready to learn.

[D_Zoot]

Bad caps is a possibility, but more likely it's shorted output transistors. 

I don't know who fixes these as I rebuild my own.

I can do it for you, but would have to work it in.  If you would like a quick turnaround you'll have to hunt around, if you aren't in any hurry you can contact me PM for shipping address and rates.

D

[Ken Layton]

I have a Rowe/ami cd100a jukebox and the left channel is bad(keep taking the 8A fuse).  I've heard that I need to replace some of the caps.  If this is true does anyone know which ones?  If not has anyone had this problem.  Does anyone know of a good place to send amps to get fixed?  I'm new to the jukebox world but ready to learn.

One or two of the output transistors mounted on the giant finned heatsink are shorted. It's possible that one or more driver transistors on the left channel driver board got damaged as well. This will blow the 8 amp fuses on the driver board if any of the above occurs.

This amplifier is old enough that some of the electrolytic capacitors on the driver boards and preamp board are drying out and going bad. However, these caps won't blow fuses, but shorted transistors do.

Here's a good guy to send the amplifier to:

http://www.abjukeboxrepair.com/contact.htm


I've been fixing these amplifiers for quite a while since my old boss had over 100 of the Rowe CD100 series jukes on the route.

Here's the common causes of amplifier failure for this amplifier:

1. Overloading the amplifier with too many speakers or connecting the wrong impedance speakers and making the load impedance too low.

2. Shorting the speaker lines. Usually happens from a staple through the external speaker wiring or rolling the jukebox's iron wheels over the speaker wires.

3. Leaving the jukebox on all the time. This amplifier does not like 24/7 operation. Unplug the machine and give the amplifier a rest once in a while. It gets ---smurfing--- hot inside that jukebox.

4. Power surges/spikes. Plug the juke into a surge protector.

[StephenH]

3. Leaving the jukebox on all the time. This amplifier does not like 24/7 operation. Unplug the machine and give the amplifier a rest once in a while. It gets ---smurfing--- hot inside that jukebox.

I wonder if it would be best to add a power switch and one turns the jukebox off when they close for the day. 

[Ken Layton]

On the power supply assembly inside the jukebox, unplug the amplifier's power cord from the "AMPLIFIER" socket and plug it into the "SERVICE" socket instead. The 'service' socket is controlled by the jukebox power switch on the back of the jukebox. The 'amplifier' socket is on constantly regardless of the power switch setting.

I do this to ALL CD-100 series jukeboxes I encounter. That way when you turn off the juke power switch the amplifier will also be turned off.

[Ken Layton]

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