System Control System Adjustment; Battery End Adjustment (Fc-72 Board) - Sony MVC-FD85 Service Manual

1-6.

SYSTEM CONTROL SYSTEM ADJUSTMENT

1. Battery End Adjustment (FC-72 board)

Check the battery end voltage.
Mode STILL
Subject All black (Cover the lens with a black
cap)
Measurement Point Display data of page: 2, address: 52
Measuring Instrument Adjustment remote commander
Adjustment Page D
Adjustment Address 90 to 94
Connection:
1) Connect the regulated power supply and the digital voltmeter
to the battery terminal as shown in Fig. 5-1-28.
Regulated power supply
Power coda
(J-6082-223-A)
Flexible of MF unit
(MVC-FD90 model only)
Need not to be connected.
Adjusting method:
1) Adjust the output voltage of the regulated power supply so that
the digital voltmeter display is 6.1 ± 0.1Vdc.
2) Turn off the power supply.
3) Turn on the HOLD switch of the adjustment remote
commander.
4) Turn on the power supply.
5) Select page: 0, address: 01, and set data: 01.
6) Select page: 6, address: 2C, and set data: 01.
7) Decrease the output voltage of the regulated power supply so
that the digital voltmeter display is 5.50 ± 0.01Vdc.
8) Select page: 2, address: 52, read the data, and this data is named
Dref.
9) Select page: D, address: 90, set data: Dref, and press the PAUSE
button of the adjustment remote commander.
10) Convert Dref to decimal notation, and obtain Dref'. (Refer to
Table 5-2-1. "Hexadecimal-decimal conversion table" of "5-2.
Service mode")
11) Calculate D
(decimal calculation), convert it to a hexadecimal number, and
input each adjustment address.
Note: After setting each data, be sure to press the PAUSE button.
12) Select page: 6, address: 2C, and set data: 00.
13) Select page: 0, address: 01, and set data: 00.
Digital voltmeter
CN002
Expansion figure
FDD unit
FU-146/140 board CN002
Fig. 5-1-28.
5-37
', D ', D ', and D
91 92 93
Address: 91 D ' = Dref'+5
91
Address: 92 D ' = Dref'+23
92
Address: 93 D ' = Dref'+44
93
Address: 94 D ' = Dref'+55
94
1
2
3
4
Cover the lens with a black cap.
Lens block
FU-146 board : MVC-FD85 model
FU-140 board : MVC-FD90 model
using following equations
94
LCD