Sony DNW-A220, Руководство по обслуживанию

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3-30
DNW-A220
DNW-A220P
For Channel Condition NG
Confirm, recheck, and clean the drum (video heads) according to the procedures below.
(1) If a check is performed using alignment tapes other than SR5-1/SR5-1P, recheck using alignment
tape SR5-1/SR5-1P.
If no abnormality is found, the check is completed.
n
If no abnormality is found during check using an alignment tape, a trouble (tape is damaged or
recording is not done properly) is considered to exist in the previously played back tape portion.
(2) Change the playback portion on the alignment tape, then recheck.
If no abnormality is found, the recheck is completed.
(3) Recheck using an alignment tape after performing the cleaning using a cleaning tape
(in Section 4-2-1).
If no abnormality is found, the recheck is completed.
(4) Recheck using an alignment tape after performing the cleaning using a cleaning tape again (the
amount of the tape used is 15 seconds).
If no abnormality is found, the recheck is completed.
(5) Recheck using an alignment tape after performing the cleaning with cleaning cloth
(in Sections 4-2-2 ).
If no abnormality is found, the recheck is completed.
If the error condition is not improved in the way mentioned above, the possible cause below are consid-
ered.
. VTR’s servo system adjustment defect or circuit defect
8 Readjust the servo system. (A0 : SERVO ADJUST)
8 Check the servo system. (C03 : REEL/CAPSTAN MOTOR & FG CHECK)
.
RF system adjustment defect
8 Readjust the RF system. (A1 : RF ADJUST)
. Worn PB head in the drum assembly
8 After confirming the hours meter (H02 : DRUM RUNNING HOURS), replace the upper drum
assembly as required.
(Refer to the maintenance manual part 2, volume-1.)
. Adjustment defect in tape transport system or component part installation defect.
8 Readjust the tape transport system or reinstall the parts
(Refer to the maintenance manual part 2, volume-1.)
. EQ-72 board defect
. Drum assembly defect
3-2. TAPE Maintenance Mode (M0)
3-2-3. RF CHECK Mode (C1)