Sony DNW-A75 Maintenance Manual page 123

For Condition NG (C11)
Recheck according to the procedures below.
(1) If a check is performed without using alignment tape
SR5-1/SR5-1P, recheck in the menu C11 using the
alignment tape SR5-1/SR5-1P.
When no abnormality is found, the recheck is completed.
n
When no abnormality is found during the check using
the alignment tape, a trouble (tape is damaged or
recording is not done properly) is considered to exist
on the tape portion used in the previously check.
(2) Change the playback portion on the alignment tape.
(3) Recheck in the menu C11.
When no abnormality is found, the recheck is completed.
(4) Clean the drum using a cleaning tape according to
Section 5-2-1.
(5) Recheck in the menu C11 using the alignment tape.
When no abnormality is found, the recheck is completed.
(6) Clean the drum using the cleaning tape again (the
amount of the tape used is 20 seconds)
(7) Recheck in the menu C11 using the alignment tape.
When no abnormality is found, the recheck is completed.
(8) Clean the drum (video heads) with a cleaning cloth
according to Sections 5-2-2 and 5-2-3
(9) Recheck in the menu C11 using the alignment tape.
When no abnormality is found, the recheck is completed.
DNW-A75/A75P
If the error condition is not improved in the way mentioned
above, the possible cause below are considered.
. Servo system adjustment defect or circuit defect
8 Readjust the servo system. (A00-01 : 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 checking the hours meter (H02 : DRUM
RUNNING HOURS), replace the upper drum
assembly as required.
(Refer to the maintenance manual part 2, volume-1.)
. In the tape transport system, adjustment defect or
component part installation defect
8 Readjust the tape transport system or reinstall the part.
(Refer to the maintenance manual part 2, volume-1.)
. EQ-75 board defect
. Drum assembly defect
4-2. TAPE Maintenance Mode (M0)
4-2-4. RF CHECK Mode (C1)
4-33