Sony HDW-750 Maintenance Manual page 500

10-6. RF System Alignment
Adjustment Procedure
1. Set the switch S1-1/AT-143 board to the ON position.
2. Insert the alignment tape (HR5-1A) and rewind the
alignment tape to the tape top.
3. Set the MENU ON/OFF switch on the inside panel to
the ON position to start up the maintenance mode.
4. Select "A17 : A11-A16 ALL ADJUST". The message
"PUSH RE TO ADJUST" appears.
5. Press the rotary encoder and the playback system
adjustment is started automatically.
The message "NOW ADJUSTING ..." appears while
the adjustment is in progress.
6. When playback system adjustment ends successfully,
the message "SET WORK TAPE FOR REC CUR-
RENT ADJUSTMENT" appears. The alignment tape
is ejected automatically.
n
The playback system alignment takes about 3 to 4 min-
utes.
7. When a working tape is inserted, the record system
adjustment starts automatically.
8. When the record system adjustment ends with success,
the message "AUTO ADJUST COMPLETE" appears.
The recording system adjustment takes about 4 to 5
minutes.
When the adjustment fails
When the adjustment fails, the message "INCOMPLETE"
appears and the alignment is halted automatically at the
instance when an error occurs. The subsequent adjustment
items are not executed.
When the adjustment fails, check the followings in the
order shown below.
1. Check if the alignment tape is HR5-1A or not.
2. If the unit is not cleaned, perform cleaning with the
use of a cleaning tape as described below and perform
the adjustment again.
a) Perform cleaning with the use of a cleaning tape and
repeat the above adjustment again.
→ When no abnormality is found, this is the end of
the adjustment.
b) Perform cleaning with the use of a cleaning tape again
and repeat the above adjustment.
→ When no abnormality is found, this is the end of
the adjustment.
10-16
c) Perform cleaning with the use of a cleaning cloth
(refer to Section 2-1) and repeat the above adjustment
again.
→ When no abnormality is found, this is the end of
the adjustment.
If the adjustment fails still, check the following
possible causes.
. Defective adjustment of the servo system, or servo
circuit is defective.
. The playback heads inside the drum assembly were
worn out.
. Defective adjustment of tape run system, or part
mounting is defective.
. EQ-88 board is defective.
. Drum assembly is defective.
. Drum/slip ring assembly is defective or its mounting
is defective.
. Connection of the flexible board (between the MDR-
14 board and the EQ-88 board) is defective.
10-6-2. Saving the RF System Adjustment
Data
n
If the automatic adjustment has not ended with success, do
not save the adjustment data.
Adjustment Procedure
1. Select "A1F : NV-RAM CONTROL".
2. Rotate the rotary encoder to move the cursor to
"SAVE ALL ADJUSTMENT DATA".
3. Press the rotary encoder to start saving the data. The
message "NOW SAVING ...." appears while saving is
in progress.
4. When saving the data ends successfully, the message
"COMPLETE" appears.
HDW-750/750CE V1