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#1
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SS160 repair help - picks every record
Hi all,
Gonna try to help a friend repair his SS160 jukebox. He says it picks every record. I d/l the manual from the arcade boneyard... John |
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#2
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SS160 repair help - picks every record
John, this sort of thing can be tricky to fix but relatively easy to
troubleshoot. First, remove the pulse amp plug from the control center. Start the machine by making a selection. It should not stop at any slot. Let it scan out and stop. Put the pulse amp RCA plug back in. Start the mech scanning --from the service switch-- make sure once it starts the switch is then in the normal or play position (whatever it is called). The mech should again scan and eventually stop w/out playing a record. Now, make a selection, if the mech immediately stops to play and plays one after the other the problem is usually excessive write-in current caused by a defective voltage regulator in the control unit. Check for 150VDC at the Zener. Also check for the presence of AC ripple there. Other possible causes a Poor contact on the RCA plug, clean and slightly squeeze the shell to make better contact. Also, check for sparking on the contacts under the tormat memory unit as the mech scans. This will generally result in random stopping -not consecutive. Has the control unit been rebuilt? If not that may wash out a lot of these sorts of problems. The main things to replace are electrolytic caps and some of the smaller caps as well. Then check the resistors for tolerance. These later selection receivers are much simplified from earlier tube based ones, but some of the same prob's occur. Rob/NYC |
#3
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SS160 repair help - picks every record
On Mar 11, 5:23*pm, Grojohn wrote:
Hi all, Gonna try to help a friend repair his SS160 jukebox. He says it picks every record. I d/l the manual from the arcade boneyard... John John, this sort of thing can be tricky to fix but relatively easy to troubleshoot. First, remove the pulse amp plug from the control center. Start the machine by making a selection. It should not stop at any slot. Let it scan out and stop. Put the pulse amp RCA plug back in. Start the mech scanning --from the service switch-- make sure once it starts the switch is then in the normal or play position (whatever it is called). The mech should again scan and eventually stop w/out playing a record. Now, make a selection, if the mech immediately stops to play and plays one after the other the problem is usually excessive write-in current caused by a defective voltage regulator in the control unit. Check for 150VDC at the Zener. Also check for the presence of AC ripple there. Other possible causes a Poor contact on the RCA plug, clean and slightly squeeze the shell to make better contact. Also, check for sparking on the contacts under the tormat memory unit as the mech scans. This will generally result in random stopping -not consecutive. Has the control unit been rebuilt? If not that may wash out a lot of these sorts of problems. The main things to replace are electrolytic caps and some of the smaller caps as well. Then check the resistors for tolerance. These later selection receivers are much simplified from earlier tube based ones, but some of the same prob's occur. Rob/NYC |
#4
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SS160 repair help - picks every record
Hi Rob,
Thanks for the info. I will post my results. This box has never been rebuilt. John |
#5
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SS160 repair help - picks every record
Hi Rob, Box is fixed. You were right on the money. Poor contact on the RCA plug, clean and slightly squeeze the shell to make better contact. The right amp needs repair also, it is working , but very low volume. I'm thinking or recapping the amp to repair that. Thanks again, John |
#6
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SS160 repair help - picks every record
That's great to hear! One thing I forget to suggest is to solder a
short length of wire from the shell of that plug, add a spade lug to the other end and bolt it under any convenient screw on the chassis I also do for the ground pin on the tormat and keyboard in my commercial installations. It eliminates the situations where resistance develops on the ground return and causes the mech to immediately trip when a selection is made. Regards, Rob |
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