RS.TR979
J
.ADJUSTMENT PROCEDURE
This unit holds recording bias and equalization
data in its EEPROM chip.
An internal CPU automatically
adjusts
playback gain, recording bias, overall gain, and overall frequency
response
according
to the ROM data.
Manual
adjustment with potentiometers
is no longer necessary except for head azimuth and tape speed.
AUother items require
only measurement
data checks.
The adjustment and checkout procedures
are as follows.
.
Writing to EEPROM
The EEPROMchip holds the optimal recording bias and equalization data.
If the chip has been replaced, be 'sure to
write to it, followingthe steps below:
Short the Test Mode terminals with a shorting clip.
While holding down the STOP button on DECK2, press the POWER
switch to ON.
All FL display segments
except for the four-digit counter on DECK2
will start blinking to indicate that the deck has entered Write mode.
At this point the four-digit counter will indicate "00**".
Blinks
n n
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U U.U
u
(dB:30:-25-20-15:12':-;;'8-6~:2-rn
-
+2;4~678"'
I L
I
I R
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--- -
-
--_J
The counter shows a four-digit hex number. The two high-order digits
indicate a ROMaddress, and the two low-orderdigits indicate the data
stored at that address.
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uu
H L
i 0
9 w
h
lset
these digits using the FF or
REW button.
The high- and low-order digits
of the address
increment
alter-
nately each time the FF button
is pressed.
The
REW button
causes these digits to decrement
alternately.
For fast incrementing
or decre-
menting,
hold down the FF or
REW button.
,-, ,-,
uu
L
Example: Set "FF" in address 56
(see Fig. 1).
LSet
these
digits
using
the
F.
PLAY or R. PLAY button.
The
high-
and
low-order
digits
of
the data
increment
alternately
each
time the F. PLAY button
is pressed.
The R. PLAYbutton
causes
these
digits
to decre-
ment alternately.
For fast incre-
menting
or decrementing,
hold
down the F. PLAY or R. PLAY
button.
c C
,- ,-
-"-' . ,- ,-
'-v-'
Lset
these digits to "FF"
using the F. PLAYor R.
PALY button.
Set these digits to "56" using
the FF or REW button.
e
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