Sony GV-A500E, Service Manual

Page: 83 / 127

5-24
3-2. SYSTEM CONTROL SYSTEM
ADJUSTMENTS
1. Initialization of D, E, F Page Data
If the D, E, F page data is erased due to some reason, perform “1-2.
INITIALIZATION OF D, E, F PAGE DATA” (See page 5-8).
2. Battery End Adjustment (VC-197 board)
Set the battery end voltage.
If the voltage is incorrect, the life of the battery will shorten.
The image at the battery end will also be rough.
Mode Camera record
Signal Arbitrary
Measurement Point LCD display of the adjusting remote
Measuring Instrument control unit
Adjustment Page D
Specified Value 28 to 2C, 35
Connection:
1)
Connect the regulated power supply and the digital voltmeter
to the battery terminal as shown in Fig. 5-3-5.
Adjusting method:
1)
Adjust the output voltage of the regulated power supply so that
the digital voltmeter display is 6.1 ± 0.1 Vdc.
2) Turn off the regulated power supply.
3) Turn on the HOLD switch of the adjusting remote commander.
4) Turn on the regulated power supply.
5) Load a cassette, and set to the VTR PB mode.
6) Set page: 0, address: 01, data: 01.
7) Decrease the output voltage of the regulated power supply so
that the digital voltmeter display is 5.30 ± 0.01 Vdc.
8) Select page: 3, address: 15, read the adjusting remote
commander display data, and this data is named Dref.
9) Set data Dref to page: D, address: 28, and press the PAUSE
button of the adjusting remote commander.
10) Set the Dref to page: D, address: 35, and press the PAUSE
button of the adjusting remote commander.
11) Convert Dref to decimal notation, and obtain Dref´. (Refer to
Table 5-1-7. “Hexadecimal notation-decimal notation
calculation table”)
12) Calculate D
29
´, D
2A
´, D
2B
´ and D
2C
´ using following equations
(decimal notation calculation).
D
29
´ = Dref´+8
D
2A
´ = Dref´+32
D
2B
´ = Dref´+53
D
2C
´ = Dref´+64
13) Convert D
29
´, D
2A
´, D
2B
´ and D
2C
´ to hexadecimal notation, and
obtain D
29
, D
2A
, D
2B
and D
2C
.
14) Set page: D, address: 29, data: D
29
and press the PAUSE button
of the adjusting remote commander.
15) Set page: D, address: 2A, data: D
2A
and press the PAUSE button.
16) Set page: D, address: 2B, data: D
2B
and press the PAUSE button.
17) Set page: D, address: 2C, data: D
2C
and press the PAUSE button.
18) Set page: 0, address: 01, data: 00.
3. Battery down voltage check
Connection:
Same connection as item “1. Battery down voltage adjustment”.
Adjustment method:
1)
Adjust the output voltage of the regulated power supply so that
the digital voltmeter indicates 6.10 ± 0.01Vdc.
2) Insert a cassette and enter the VTR PB mode.
3) Adjust the output voltage of the regulated power supply so that
the digital voltmeter indicates 5.53 ± 0.01Vdc.
4) Confirm that the battery down indication
i
on the POWER
LED and EVF flashes at the rate of 0.8Hz.
5) Adjust the output voltage of the regulated power supply so that
the digital voltmeter indicates 5.27 ± 0.01Vdc.
6) Confirm that the battery down indication i on the POWER
LED and EVF flashes at the rate of 3.2Hz.
Fig. 5-3-5.
Digital voltmeter
Regulated power supply
6.1V
±
0.1V