Sony GV-A500 Service Manual ▷ View online
5-22
5. Condensation, head clogging check
Page 3
Address 17
Using method:
1)
1)
Select page: 3, address: 17.
2)
By discriminating the bit value of the display data, the state of
the VTR can be discriminated.
the VTR can be discriminated.
6. VTR state check (1)
Page 3
Address 18
Using method:
1)
1)
Select page: 3, address: 18.
2)
By discriminating the bit value of the display data, the state of
the VTR can be discriminated.
the VTR can be discriminated.
7. VTR state check (2)
Page 3
Address 19
Using method:
1)
1)
Select page: 3, address: 19.
2)
By discriminating the bit value of the display data, the state of
the VTR can be discriminated.
the VTR can be discriminated.
Bit
0
1
2
3
4
5
6
7
Function
Condensation state (1 hour preservation)
Head clogging
When bit value = 1
Condensation
Head clogging
When bit value = 0
Bit
0
1
2
3
4
5
6
7
Function
Video/audio circuit PB mode
Head clog detection when REC
Recorded tape playback
Capstan rotation
When bit value = 1
PB mode
Head clog
Playback
Rotation
When bit value = 0
REC/E-E mode
Bit
0
1
2
3
4
5
6
7
Function
Eject state
Cassette insertion state
Cassette accidental erasure prevention
Tape type
Tape type
Crystal variable speed playback
Variable speed playback mode
DRUM
When bit value = 1
Eject state
Cassette in
Accidental erasure
prevention state
prevention state
ME
Hi8 MP
Variable speed playback
Variable speed playback
mode
mode
DRUM rotation
When bit value = 0
REC/E-E mode
MP
MORMAL MP, ME
STOP
5-23
8. VTR state check (3)
Page 3
Address 1A
Using method:
1)
1)
Select page: 3, address: 1A.
2)
By discriminating the bit value of the display data, the state of
the VTR can be discriminated.
the VTR can be discriminated.
9. Record of Use Check
Page 3
Address E0 to E9
Using method:
1)
1)
The record of use data is displayed at page 3, addresses: E0 to
E9.
E9.
Note :
This data will be erased when the coin lithium battery is
removed (reset).
removed (reset).
Bit
0
1
2
3
4
5
6
7
Function
Playback tape recording mode
Audio mode
When bit value = 1
Hi8
Monaural
When bit value = 0
Standard 8
Stereo
Bit
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
Function
Service status
Drum rotation
Hour (H)
counted time
Hour (L)
(BCD code)
Minute
User initial power
Year
on date
Month
(BCD code)
Day
Final condensation
Year
occurrence date
Month
(BCD code)
Day
Remarks
For checking reset. Normal = “FF”. Reset: “00”
1000th place digit and 100th place digit of counted time (decimal digit)
10th place digit and 1st place digit of counted time (decimal digital)
After setting the clock, set the date of power on next
5-24
3-2.
SYSTEM CONTROL SYSTEM
ADJUSTMENTS
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).
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.
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)
1)
Connect the regulated power supply and the digital voltmeter
to the battery terminal as shown in Fig. 5-3-5.
to the battery terminal as shown in Fig. 5-3-5.
Adjusting method:
1)
1)
Adjust the output voltage of the regulated power supply so that
the digital voltmeter display is 6.1 ± 0.1 Vdc.
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.
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.
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.
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”)
calculation table”)
12) Calculate D
29
´, D
2A
´, D
2B
´ and D
2C
´ using following equations
(decimal notation calculation).
D
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”.
Same connection as item “1. Battery down voltage adjustment”.
Adjustment method:
1)
1)
Adjust the output voltage of the regulated power supply so that
the digital voltmeter indicates 6.10 ± 0.01Vdc.
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.
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.
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
5-25
3-3.
SERVO SYSTEM ADJUSTMENTS
1. CAP FG Offset Adjustment (VC-197 board)
Improve the capstan servo characteristic. If it is not correct, jitters
will increase.
will increase.
Mode
Playback (SP mode)
Signal
Alignment tape : For operation check
(WR5-5NSP(NTSC))
(WR5-5CSP(PAL))
(WR5-5NSP(NTSC))
(WR5-5CSP(PAL))
Measurement Point
Pin
4 of CN207 (CAP FG)
Measuring Instrument
Oscilloscope
Adjustment Page
F
Adjustment Address
3A
Specified Value
Duty = 50 ± 1.5%
Adjusting method:
1)
1)
Set page: 0, address: 01, data: 01.
2)
Change the page: F, address: 3A, data by pressing the PLAY
and STOP buttons of the remote commander until the duty
satifies the specification.
and STOP buttons of the remote commander until the duty
satifies the specification.
3)
Press the PAUSE button of the adjusting remote commander.
4)
Set page: 0, address: 01, data: 00.
Fig. 5-3-6.
A
B
Duty=A/B
×
100 [%]
Center of movement
2. Switching Position Adjustment (VC-197 board)
If deviated in this case causes switching noise or jitter on the played
back screen.
back screen.
Mode
Playback
Signal
Alignment tape:
For tracking adjustment
(WR5-1NP (NTSC))
(WR5-1CP (PAL))
For tracking adjustment
(WR5-1NP (NTSC))
(WR5-1CP (PAL))
Measurement Point
CH1: Pin
3 of CN207 (RF SWP)
CH2: Pin
6 of CN207 (PB RF)
Measuring Instrument
Oscilloscope
Adjustment Page
F
Adjustment Address
36, 37
Specified Value
t1 = 0 ± 10
µ
sec
Note :
NTSC model : GV-A500
PAL model : GV-A500E
PAL model : GV-A500E
Adjusting method:
1)
1)
Set page: 0, address: 01, data: 01.
2)
Change the data of page: F, address: 37 and minimize “t1”,
and press the PAUSE button of the adjusting remote
commander. (Coarse adjustment)
and press the PAUSE button of the adjusting remote
commander. (Coarse adjustment)
3)
Change the data of page: F, address: 36, and adjust so that the
switching position (t1) becomes the specified value. (Fine
adjustment)
switching position (t1) becomes the specified value. (Fine
adjustment)
4)
Press the PAUSE button of the adjusting remote commander.
5)
Set page: 0, address: 01, data: 00.
Fig. 5-3-7.
CH1
CH2
Enlargement
t1=0
±
10
µ
sec
CH1
CH2
Click on the first or last page to see other GV-A500 service manuals if exist.