Troubleshooting

In view of the Classic’s input/output flexibility, the many connecting cables to and from the components which may be connected to it, and the large number of possibilities for mis-set switches both on the Classic and on the various ancillary components operating with it, obviously it is impossible to offer a complete troubleshooting guide to all of the problems which could, in principle, occur. Most such potential problems will be avoided simply by following the instructions in this owner’s manual and the instructions supplied with associated products; and many other possible problems will be prevented simply by the excellent reliability of modern components.

So in this section we will provide a guide to some of the most basic and common difficulties which may arise from time to time, and suggestions as to their probable causes. To illustrate the sort of thought process which is useful in tracking down problems, we begin with the most basic: no sound because the preamp’s power is off. Did you accidentally hit the Power button when reaching for the Stereo/Mono button? Was the preamp’s AC line cord accidentally pulled partially out of its wall socket during housecleaning earlier in the day? Did something else on that same household branch circuit (including the power amp or other component plugged in the preamp’s AC convenience outlets) cause a current surge which blew the fuse or circuit breaker protecting that entire branch circuit? In some houses having duplex AC wall sockets, the lower one is permanently live while the upper one (intended for lamps) is controlled by a wall switch near a doorway; was the preamp’s AC cord accidentally plugged into the switched socket? Is the preamp’s AC cord plugged into a clock timer which is presently off or unplugged from the wall?

User's Manual

No sound.

•The preamplifier’s power may be off, the amplifier off, line cords unplugged, AC fuses blown, or the power may be off at the wall socket or power strip.

No sound (the power is on)

•Input selector set to an inactive input.

•Tape monitor switch is engaged with no tape machine running.

•Input level controls are turned down on the power amplifier.

•Input or output signal cables may be disconnected.

•The selected program source is not operating.

•Output level control turned down at program source.

•Program source misadjusted (for example, the FM tuner is tuned between stations.

No sound (phono)

•Rear panel Phono MM/MC selector button in wrong position.

•Internal ribbon cable unplugged

•No phono power jumper in place on power supply board.

No sound in one channel.

•Defective cable from the preamp to the power amp or from a program source to the preamp.

•Speaker wire loose or disconnected.

•Balance control fully clockwise or counter-clockwise.

•Imperfect contact in a switch (espe- cially any lever or slide switch in a program source or signal processor, as well as the various signal-routing switches in the preamp).

•A speaker’s fuse is blown.

Troubleshooting 19