Technics RS-TR474 Service Manual page 20

RS-TR474 |
Step 4
Step 5
Step 6
Step 7
Step 8
The counter shows a four-digit hex number.
indicate a ROM address, and men two |
stored at that address.
TE
ul
aes these digits using the FF or L
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.
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ea |
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ec
rQ— TT
tor
{;
ow-order. digits indicate the data
Set these digits using the F.
PLAY or R. PLAY button. " The
high- and tow-order digits of
the data increment alternately
each time the F. PLAY button
is pressed. The R. PLAY button
causes these digits to decre-
ment alternately. For fast incre-
menting or decrementing, hold
down the F. PLAY or R. PLAY
button.
The two high-order digits .
Begin from address 00 and write data up to address 7F (data in
[[]). Check that the data at address 7F is "00" (end), and then exit
the write mode.
After completing ROM writing, press the STOP button on DECK2 to
restore the normal Test mode. The four-digit counter on DECK1
displays.
PLAYBACK GAIN
eSet the AF oscillator's output frequency to 315Hz/—20dB (100mV)
(see Fig. 2).
*With no tape loaded in the deck, press and hold the REC button.
Adjust the test signal level using the Rec. Level and Balance controls
until the line output levels on both channels are 320mV. When the
adjustment is complete, release the REC button. (The deck stores
the data at the moment the REC button is released.)
Load the test tape, QZZCFM, into the deck and locate the section of
the tape where the playback gain test tone (815Hz, 0dB) is recorded,
then playback the portion. Press the ATC button, and the display will
flash [J slowly, meaning that playback gain is being automatically
adjusted. Press the play button. (At this point the deck automatically
adjusts playback gains.)
the output level falls in the specified range.
Standard value: 320mV+0.5dB
Note: If adjustment of PLAYBACK GAIN fails, the display will flash [J
rapidly. After a successful adjustment, the display will no longer
show [J].
After this play back the tape and verify that -
Example: Set "FF" in address 03
t
Ma
U
U
AF "oscillator
(see Fig. 3).
mr
ma) ~
ol
t
{
L set these digits to "5A"
using the F. PLAY or R.
PALY button.
Set these digits to "03" using
the FF or REW button.
ATT