Sony FD Mavica MVC-FD75, Service Manual

Page: 72 / 90

5-21
1-5. SYSTEM CONTROL SYSTEM ADJUSTMENTS
1. Battery Down Adjustment (FC-86 Board)
Set the battery end voltage.
If the voltage is incorrect, the life of battery will shorten.
The image at the battery end will also be rough.
Mode CAMERA
Subject Arbitrary
Measurement Point Displayed data of page: 3,
address: 0D
Measuring Instrument Adjusting remote commamder
Adjustment Page F
Adjustment Address 18 to 1C
Connection:
1) Connect the regulated power supply and the digital voltmeter
to the battery terminal as shown in Fig. 5-1-20.
Preparations before adjustment:
1) Adjust the output voltage of the regulated power supply so
that the digital voltmeter display is 6.1 ± 0.1 Vdc.
2) Turn on the HOLD switch of the adjusting remote commander.
3) Turn on the power supply.
4) Set the CAMERA mode.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 Decrease the output voltage
of the regulated power supply
so that digital voltmeter
display is 5.80 ± 0.01 Vdc.
3 3 0D Read the data and this data is
named Dref
4 F 18 Dref Press PAUSE button.
5 Convert Dref to decimal
notation and obtain Dref’.
(Note)
6 Calculate D
19
’, D
1A
’, D
1B
’and
D
1C
’using following
equations (decimal
calculation).
7 D
19
’= Dref’ + 8
D
1A
’= Dref’ + 23
D
1B
’= Dref’ + 44
D
1C
’= Dref’ + 55
Fig. 5-1-20
Regulated power supply
5.80
±
0.01 Vdc
Digital voltmeter
Power cord
(J-6082-223-A)
2. Alignment Check (FDD Unit)
Confirm that the FDD alignment is within the specifications. If
deviated, reading and writing data from and to floppy disk be-
come impossible.
Or compatibility of floppy disk with other machines can be lost.
Mode PLAY
Signal Alignment disks (TFD2-1 (+))
and (TFD2-2 (–)):
Arbitrary signal
Measurement Point Check on LCD screen
Measuring Instrument
Specified Value The playback pictures should be
normal
Checking method:
1) Disconnect the adjusting remote commander.
2) Insert the alignment disk TFD2-1 (+) (+17.5 um).
3) Playback arbitrary signal and check that the playback picture
is normal.
4) Insert the alignment disk TFD2-2 (–) (–17.5 um).
5) Playback arbitrary signal and check that the playback picture
is normal.
Order Page Address Data Procedure
8 Convert D
19
’, D
1A
’, D
1B
’and
D
1C
’to a hexadecimal number,
and obtain D
19
, D
1A
, D
1B
and
D
1C
. (Note)
9 F 19 D
19
Press PAUSE button.
10 F 1A D
1A
Press PAUSE button.
11 F 1B D
1B
Press PAUSE button.
12 F 1C D
1C
Press PAUSE button.
Note:
Refer to table 5-2-2 “Hexadecimal-decimal conversion
table”.
Processing after Completing Adjustments:
Order Page Address Data Procedure
1 0 01 00