Sylvania clock radio SCR1206B why the digital clock is so fast and advance

To reset the clock on a JVC PC-110 boombox from 1994, follow these steps:

1. Press the Clock Set button, located on the top of the boombox, to enter clock setting mode.
2. Press and hold the Clock Set button until the hour digits on the display start flashing.
3. Use the Fast Forward and Rewind buttons to adjust the hour to the correct time.
4. Press the Clock Set button again to move to the minute digits. The minute digits will start flashing.
5. Use the Fast Forward and Rewind buttons to adjust the minute to the correct time.
6. Press the Clock Set button one final time to exit clock setting mode and save the new time.

Your JVC PC-110 boombox should now display the correct time.

Sounds normal. Most digital clocks have a rapid set in forward and a slow in backwards. Helps you to get through the hours quickly. As you speed past the correct setting, you then backup slowly to the correct time.

https://www.manualslib.com/manual/944856/Sylvania-Scr1206b-Pl.html



Free manual at the web link shown.


Sylvania SCR1206B PL Instruction Manual

Typically, you have to hold down a "Time" or "Clock" button, then press either a fast or slow button and hold it until the display reads the correct time. Some models have hour and minute buttons instead of fast or slow, and a few have a slide switch that you move to the clock adjust position (it would also have an alarm set position) before the hour/minute or fast/slow buttons are enabled. Some clocks reset to 12:00 AM if you hold Clock, Fast and Slow all at the same time. You'll just have to experiment a bit to find out what works on yours.

With the new digital clocks, there is really nothing you can do to fix this. The clock running fast is due to a faulty electronic or electric component that is out of tolerance. US electricity runs at 60Hz, which is 1 cycle per second. Clocks use this to advance the seconds on a clock. Too fast means the 60Hz on the AC power input is not being properly used and is running the clock at something less than 1 cycle per second.

check Sylvania web site?

This was taken from a radio similar to yours. Same brand but different model. Hopefully it'll help.

(Also the "SEL" button it talks about is a big round button/knob on the right of the unit.)

Setting the Time

This receiver uses the 12-hour display notation.

1 Turn [SEL] button to select CLOCK ADJ.

2 Press the [SEL] button.
The clock adjustment mode is activated.

3 Turn [SEL] button to display the item to be selected for
adjustment.
Hours, minutes or exact hour will be switched each time the
button is turned.

4 Press the [SEEK / FAST] button.
[SEEK] button: Turns the time forward.
[FAST] button: Turns the time back.
To set the clock to 0 minutes, 0 seconds (an exact hour),
press the [SEEK / FAST] button.
For example:
At 3:29: Pressing the [SEEK / FAST] button returns to 3:00.
At 3:30: Pressing the [SEEK / FAST] button advances to 4:00.

5 Press the [RTN] button.
At this time, other adjustments can also be made in
Function Mode.

6 Press the [FUNC] button to exit Function Mode.

The clock uses a 12-hour digital indication...... Press and hold the select button...... The setup display appears...... Press the select button repeatedly until “CLOCK-ADJ” appears...... Press (DSPL...... The hour indication flashes...... Rotate the volume control dial to set the hour and minute...... To move the digital indication, press (DSPL...... Press the select button...... The setup is complete and the clock starts......

Make sure the clock is in standby mode, as opposed to playback mode. Press time set button — the clock digits will blink. If they don't, you're in playback mode. Press the hour button to adjust the hour. Press the minute button to adjust the minute. Press time set button to confirm the time.