Servo System Alignment - Sony HDW-750 Maintenance Manual

10-5. Servo System Alignment

All adjustments of the servo system are performed using
the adjustment menu of the maintenance mode.
The data obtained by adjustment is automatically saved in
the servo system EEPROM (IC403/MDC-13 board).
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Before starting the servo system adjustment, be sure to set
the VTR SAVE/STBY switch on the inside panel to the
STBY position.
When an adjustment fails
When an adjustment fails, the message "INCOMPLETE"
appears on the menu display. The following two causes are
possible.
. The adjustment itself has not completed to its end.
. The adjustment ended successfully but the data failed to
be saved in the servo system EEPROM.
To determine which of the above two causes applies,
execute "A000 : NV-RAM INITIALIZE". If this ends
with the message "INCOMPLETE", communication
with the servo system EEPROM may have an error.
For details of how to execute "A000 : NV-RAM
INITIALIZE", refer to Section 10-5-1.
Adjustment items
10-5-1. Servo System
Adjustment Data
Initialization
10-5-2. Capstan FG Duty Ratio
Adjustment
10-5-3. Capstan Add-On
Recording Adjustment
10-5-4. Drum Phase Adjustment A003 : DRUM PHASE
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For the procedure of starting up the maintenance mode,
refer to Section 11-2-2.
HDW-750/750CE V1
Menu display
A000 : NV-RAM INITIALIZE
A001 : CAPSTAN FG DUTY
A002 : CAPSTAN DELAY
10-5-1. Servo System Adjustment Data
Initialization
When the servo system EEPROM (IC403/MDC-13 board)
is replaced, the servo adjustment data must be initialized as
follows.
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Be sure to turn off the main power upon completion of the
servo system adjustment data initialization Then turn the
main power back on and perform all of the adjustments
shown in Sections 10-5-2 through 10-5-4.
Adjustment Procedure
1. Set the switch S1-1/AT-143 board to the ON position.
2. Set the MENU ON/OFF switch on the inside panel to
the ON position to start up the maintenance mode.
3. Select "A000 : NV-RAM INITIALIZE". The message
"PUSH RE TO INITIALIZE" appears.
4. Press the rotary encoder to start initialization.
The message "NOW INITIALIZING ..." appears
while the initialization is in progress.
5. When initialization ends successfully, the message
"COMPLETE" appears.
6. Turn off the main power once.
When the adjustment fails
When the initialization fails, the message "INCOM-
PLETE" appears.
Check the following possible causes.
. IC403/MDC-13 board is defective.
. Communication between the MDC-13 board and the SS-
92 board is defective.
10-5. Servo System Alignment
10-13