10-15
HDW-750/750CE V1
10-5-4. Drum Phase Adjustment
The alignment tape (HR2-1A : Part No. 8-960-076-11) is
required for this adjustment. The alignment tape (HR2-1A)
is used at the position of 00 : 01 : 00 : 00 to 00 : 10 : 00 : 00.
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Be sure to use the specified alignment tape. If any tape
other than the specified alignment tape is used for this
adjustment, the correct drum phase cannot be obtained
even though “COMPLETE” appears upon completion of
adjustment.
Adjustment Procedure
1.
Cue up the alignment tape (HR2-1A ) to the position
of 00 : 01 : 00 : 00.
2.
Eject the alignment tape.
3.
Set the switch S1-1/AT-143 board to the ON position.
4.
Set the MENU ON/OFF switch on the inside panel to
the ON position to start up the maintenance mode.
5.
Select “A003 : DRUM PHASE”.
The message “PUSH RE TO ADJUST” appears.
6.
Press the rotary encoder.
The message “INSERT HR2-1A” appears.
7.
Insert the alignment tape (HR2-1A ) that has been
already cued up to the position of 00 : 01 : 00 : 00.
8.
When the alignment tape is inserted, the adjustment
starts automatically.
The message “NOW ADJUSTING ...” appears while
the adjustment is in progress.
9.
When adjustment ends successfully, the message
“COMPLETE” appears. The adjustment data is
automatically saved in the servo system EEPROM
(IC403/MDC-13 board).
10. The alignment tape is ejected automatically.
When the adjustment fails
When the adjustment fails, the message “INCOMPLETE”
appears and the alignment tape is ejected automatically.
Check the following possible causes and repeat this
adjustment again.
.
The alignment tape (HR2-1A ) is not cued up to the
correct position of 00 : 01 : 00 : 00.
.
Tape running is abnormal during playback mode.
.
IC303/MDC-13 board is defective.
.
Signal circuit between MDC-13 board and the SS-92
board is defective.
.
Signal circuit between EQ-88 board and the MDR-14
board is defective.
.
Signal circuit between MDC-13 board and the MDR-14
board is defective.
.
Drum motor unit is defective.
10-6. RF System Alignment
All adjustments of the RF system are performed using the
adjustment menu of the maintenance mode.
Adjustment items
Menu display
10-6-1. RF System Continuous
A17 : A11 - A16 ALL ADJUST
Automatic Adjustment
10-6-2. Saving the RF System
A1F : NV-RAM CONTROL
Adjustment Data
10-6-3. PB Channel Condition
C11 : PB CH CONDITION
Check
10-6-4. REC Channel Condition
C12 : REC CH CONDITION
Check
10-6-1. RF System Continuous Automatic
Adjustment
When this adjustment is once initiated, the following
adjustments are performed automatically in the order
shown below.
1.
Playback PLL circuit VCO free-run frequency adjust-
ment during playback mode (A13 : PLAY PLL)
2.
RF signal A/D conversion gain adjustment (A16 : A/D
GAIN)
3.
Playback level of PB heads and playback equalizer
circuit gain/phase adjustment (A11 : EQUALIZER)
4.
Playback PLL circuit VCO free-run frequency adjust-
ment in FWD mode (A14 : FWD PLL)
5.
Playback PLL circuit VCO free-run frequency adjust-
ment in REV mode (A15 : REV PLL)
6.
Record current/record frequency response adjustment
of recording heads (A12 : REC CURRENT)
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For the above adjustment items 1 through 5, be sure to use
the alignment tape (HR5-1A : Part No. 8-960-076-01).
For the adjustment item 6, use a working tape (BCT-
40HD).
The correct adjustment cannot be executed if a tape other
than the specified tape is used for adjustment.
10-5. Servo System Alignment
10-6. RF System Alignment
