DX-7555
ADJUSTMENT PROCEDURE
ADJUSTMENT OF MASTER CLOCK FREQUENCY
GND
FL display
Ex.
( + 00 )
( + 10 )
( - 10 )
--->
--->
UP dial (JOG)
DOWN dial (JOG)
FL display
( + 00 )
FL display
UPDATING..
UPDATE OK
--->
Ex.
--- Top view ---
Main circuit PC board (NAAR-8645)
Frequency counter
[When]
1. Exchange super precision clock PC board ass'y (NADG-8725).
2. Exchange IC X001 (Crystal), IC Q9005 (MPC29M33HF), and IC Q8005 (Main microprocessor).
[Procedure]
1. Connect the frequency counter to the test point P703 on main circuit PC board (NAAR-8645).
2. Press the
POWER
button to turn on the unit.
3. Wait for 3 minutes. (Heat running)
4. Press and hold down the
STOP [ ]
button, then press the
FF (fast forward) [ ]
button. All segments light up.
5. Press the
STOP [ ]
button, after
"NO KEY"
is displayed.
6. Press and hold down the
PLAY [ ]
button, then press the
DISPLAY
button.
7. Operate the
UP/DOWN (JOG)
dial so that the reading of frequency counter becomes 16.934400 MHz +1 / -1 Hz.
8. Press and hold down the
DISPLAY
button, then press the
PUSH TO ENTER (JOG)
button.
9. Press the
PUSH TO ENTER (JOG)
button, after
"NO DISC"
is displayed.
10. Press the
POWER
button to turn off the unit.
11. Disconnect the frequency counter.
"16.934400 MHz +1 / -1 Hz"
Test point
P703
Summary of Contents for DX-7555
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Page 16: ...DX 7555 E F G H...
