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4. Set the INPUT LEVEL knob until regular musical peaks
register uo to OdB with
occasional
peaks registering as high
as +3db'.
5. Press > to begin recording.
6. During recording, watch the Peak Level Indicators to make
sure that regular peaks do not exceed +3dB'.
• To insert a momentary blank space, press REC MUTE (TD
262 only).
• To pause during recording, press o ii (REC/PAUSE). Press
> (PLAY) to continue recording.
• To stop recording, press ■ .
1. When using metal tape formulations with Dolby C noise
reduction, it is possible to record occasional musical peaks
as high as +5dB. To determine if saturation distortion has
occurred while recording at higher levels, reset the counter
to 000 during recording, then later rewind the tape back to
that point and play back that section.
This is a simple way to fine tune your cassette tape and deck.
It uses interstation tape hiss as a test source. The BIAS FINE
TRIM control is rotated in increments each time the Tape
Counter advances 10 units. Then, when listening to playback ,
you can use the Tape Counter to determine which BIAS FINE
TUNE position provided the best frequency response.
Please note that the BIAS FINE TRIM control has less effect
with metal tape than with LN or CrC
)2
tapes.
1. Make sure that the NR button on the TD262 / TD212 is in
the OUT position (off).
2. Select the proper BIAS/EQUALIZATION setting to match
the tape type being used.
3. Rotate the BIAS FINE TRIM control as far as it will go to
the left (hi cut). We will refer to this as the "7 o'clock"
position, since it corresponds to that position on a clock
face.
4. Set your receiver/pre-amp/integrated amp's SOURCE
selector to TUNER.
5. Turn off any MUTE and SEEK features on your tuner (or
tuning section of a receiver) and tune between stations until
you hear only loud hiss (interstation noise).
6. After loading a blank cassette into the deck, press » to
advance toward the middle of the tape.
7. Press ■ (STOP) and then o ll (REC/PAUSE).
8. Set the INPUT level control until the Peak Level Meters
read -3dB.
9. Reset the Tape Counter to 000.
10. Press > to begin recording.
11. When the Tape Counter reads 010, quickly rotate the BIAS
FINE TRIM control clockwise to the "8 o'clock" position.
12. When the Tape Counter reads 020, rotate the BIAS FINE
TRIM control to "9 o'clock".
13. Continue this operation until the Tape Counter reads 80 and
the BIAS FINE TRIM knob has been rotated fully clock¬
wise to the right as far as it will go (hi boost).
14. Press ■ and rewind the tape back to the point
where the tape counter reads 000.
15. Select TAPE MONITOR on your receiver/pre-amp/etc.
Turn up the volume to a relatively high level or plug in a
set of headphones and listen through them.
16. Press > on the TD262 / TD212.
17. While watching the Tape Counter, listen to the interstation
FM hiss. At each 10 tape counter units, the treble quality
of the hiss should change slightly. Compare it with "live"
interstation noise by pressing the TAPE MONITOR button
in and out. When the playback hiss and the "live" hiss
sound very close to the same, note the numbers on the Tape
Counter. These correspond to the BIAS FINE TRIM ad¬
justment for the particular tape you are using.
040
040
040
Figure 4 Adjusting Bias-Fine Trim
If you wish, you may repeat the test making adjustments just in
close proximity to what seems to be the optimal setting. This
can further fine tune bias adjustments, although past a certain
point, minute changes will be hard to detect.
You should repeat this test again each time you change brands
or formulations of cassette tape.
All cassettes are provided with an erasure protection system. It
consists of two small tabs covering square holes on the back of
the cassette shell. When these small plastic tabs are removed,
it is impossible to re-record the cassette.
Thus you can protect a recorded tape form accidental erasure
by prying these tabs off with a small screwdriver.
If you wish to use an erasure-protected cassette again for
recording, simply cover the holes with adhesive tape.
After replacing a tape in its case, store it in a location well
away from direct sunlight, high temperatures and excessive
humidity.
Be especially careful to avoid placing a cassette tape near
television sets or loudspeakers where magnetic fields may
partially erase the tape.
Do not use old cassettes that no longer smoothly pass the tape
from reel-to-reel. They may jam or otherwise provide unsatis¬
factory performance.
9
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