Sony DNW-A75 Maintenance Manual page 155

For Condition NG/Automatic Adjustment Failure
Recheck according to the procedures below when the
massage "Condition NG" or "Auto Adjust Failure" is
displayed in the adjustment menu (A11 to A17).
(1) Confirm whether the specified alignment tape is used.
If the specified alignment tape is not used, execute the
automatic adjustment by the specified one.
SR5-1 for 525/60 system, SR5-1P for 625/50 system
When no abnormality is found, the readjustment is
completed.
(2) Clean the drum (video heads) according to the "For Condi-
tion NG (C11)" in "4-2-4. RF CHECK Mode (C1)".
This operation is not required when the drum has been
already cleaned.
(3) When message "Condition NG" or "Auto Adjust
Failure" is displayed during execution of menus other
than menu A17 or A13, perform the menu A17.
When no abnormality is found, the readjustment is
completed.
If the message "Condition NG" is displayed, 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 compo-
nent 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 or Drum assembly defect
Or if the message "Auto Adjust Failure" is displayed, the
possible above and following cause are considered.
. Brush slip ring assembly defect or its part installation/
connection defect
8 Replace or reinstall the brush slip ring assembly.
(Refer to the maintenance manual part 2, volume-1.)
. Harness (between the EQ-75 board and drum assembly)
connection defect
DNW-A75/A75P
A1F : NV-RAM CONTROL
This menu is used to save the RF adjustment data adjusted in
the RF ADJUST mode into the NV-RAM of the RF system.
The adjustment data of A30 : EQ VR adjusted in the BETA-
CAM PB ADJUST mode is also saved in this menu.
The current adjustment data can return to the former saved
data before adjustment when executing ALL DATA
PREVIOUS without saving the adjustment data into the
NV-RAM.
c
Do not save the adjustment data into the NV-RAM when
abnormality is found during automatic adjustment (when
the message "Auto Adjust Failure" or " Condition NG"is
displayed).
n
When the power is turned off without saving the adjusted
data, the adjustment data returns to the former saved data.
To execute the menu
(1) Turn the search dial to set the * mark on the superim-
posed display as described below.
To save the adjustment data after adjustment:
8 "SAVE ALL ADJUST DATA"
To return the adjustment data before adjustment:
8 "ALL DATA PREVIOUS"
. In the time data display area, a message "SAVE
ALL ADJUST" or "ALL DATA PREVIOU" will be
displayed, respectively.
(2) Press the SET button once.
. On pressing it, the data transmission is initiated.
. On the superimposed display, a message "Saving ..."
or "Loading ..." will be displayed.
In the time data display area, a message "SAVING"
or "LOADING" will be displayed.
(3) Check to see that the data transmission is completed.
. On completing the data transmission:
On the superimposed display, a message "Save
Complete." or "Load Complete" will be displayed.
In the time data display area, a message "SAVING"
or "LOADING" will be displayed.
(4) To exit the menu, press the MENU button once.
4-2. TAPE Maintenance Mode (M0)
4-2-9. RF ADJUST Mode (A1)
4-65