Pb Channel Condition Check; Rec Channel Condition Check - Sony HDW-750 Maintenance Manual

10-6-3. PB Channel Condition Check

This adjustment requires the alignment tape (HR5-1A :
Part No. 8-960-076-01).
Use the segment of the alignment tape, that has the contin-
uous recording of 2 minutes or longer.
Check Procedure
1. Set the switch S1-1/AT-143 board to the ON position.
2. Insert the alignment tape (HR5-1A).
3. Set the MENU ON/OFF switch on the inside panel to
the ON position to start up the maintenance mode.
4. Select "C11 : PB CH CONDITION". The message
"PUSH RE TO ADJUST" appears.
5. Move the cursor to "ALL" and press the rotary
encoder to start checking.
The message "NOW CHECKING ..." appears while
the checking is in progress.
6. All channels are checked starting from A-CH in this
order.
7. When the check ends successfully, the message
"GRN" appears in the right of "ALL".
When the check fails
When the check fails, the message "CONDITION NG" appears.
When the check fails, perform the check again in the
following order shown below.
1. Change the playback position of the alignment and
perform the check again.
→ When no abnormality is found, this is the end of
the check.
2. Perform cleaning with the use of a cleaning tape and
repeat the above check.
→ When no abnormality is found, this is the end of
the check.
3. Perform cleaning with the use of a cleaning tape again
and repeat the above check.
→ When no abnormality is found, this is the end of
the check.
4. 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 check.
If the check fails still, check the following possible causes.
. Defective adjustment of the servo system, or servo
circuit is defective.
. Defective adjustment of the RF playback system.
. 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.
HDW-750/750CE V1

10-6-4. REC Channel Condition Check

This adjustment requires a working tape (BCT-40HD).
Check Procedure
1. Set the switch S1-1/AT-143 board to the ON position.
2. Insert a working tape.
3. Set the MENU ON/OFF switch on the inside panel to
the ON position to start up the maintenance mode.
4. Select "C12 : REC CH CONDITION". The message
"PUSH RE TO ADJUST" appears.
5. Move the cursor to "ALL" and press the rotary
encoder to start checking.
The message "NOW CHECKING ..." appears while
the checking is in progress.
6. All channels are checked starting from A-CH in this
order.
7. When the check ends successfully, the message
"GRN" appears in the right of "ALL".
When the check fails
When the check fails, the message "CONDITION NG"
appears.
When the check fails, perform the check again in the
following order shown below.
1. Refer to "10-6-3. PB Channel Condition Check" using
the alignment tape (HR5-1A).
If any abnormality is found, follow the instructions
described in the paragraph "When the check fails" of
Section 10-6-3.
When no abnormality is found, proceed to step 2.
2. Perform cleaning with the use of a cleaning tape and
repeat Section 10-6-4 using a working tape.
→ When no abnormality is found, this is the end of
the check.
3. Perform cleaning with the use of a cleaning tape again
and repeat the above check.
→ When no abnormality is found, this is the end of
the check.
4. 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 check.
If the check 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.
10-6. RF System Alignment
10-17