Contrast Adjustment (Pk-46 Board); System Control Adjustment; Battery Down Adjustment (Fc-69 Board) - Sony MVC-FD73 Service Manual

6. CONTRAST adjustment (PK-46 board)

(See original service manual page 5-21.)
: Deleted point
: Changed point
This adjustment sets correctly the VIDEO signal level that drives
the LCD. If disordered, LCD screen will not be sharp, or will white
blur or black blur.
Mode Playback
Alignment disk: Stair-step signal of 10
Signal
steps
CN802 9 pin (VG)
Measurement point
External trigger: CN802 7 pin (HSY)
Measuring equipment Oscilloscope
Adjustment page F
Adjustment address 35
A=2.90 ± 0.07 Vp-p (SHARP)
Specification value
A=2.54 ± 0.07 Vp-p (CASIO)
Adjustment procedure:
1) Set data: 01 to page: 0, address: 01.
2) Set data: 60 to page: 3, address: 18.
3) Change the data on page: F, address: 35 so that the voltage (A)
between pedestal (0IRE) and 100IRE satisfies the specification
value.
4) Press the PAUSE button on the adjustment remote commander.
Processing after adjustment finished:
1) Set data: 00 to page: 0, address: 01.
2) Confirm that the specification value of the "BRIGHT
adjustment" is satisfied. If not, perform the "BRIGHT
adjustment".
A
Fig. 5-1-7
100 IRE
0 IRE
2H
1-5.

SYSTEM CONTROL ADJUSTMENT

1. Battery down adjustment (FC-69 board)

(See original service manual page 5-23E.)
: Changed point
This adjustment specifies the battery end voltage. If disordered, the
battery service life will be shortened, or images will be deformed at
the battery end.
Mode
Signal
Measurement point
Adjustment page
Adjustment address
Switch setting:
1) IRIS OPEN (BLACK)
Connection:
1) Connect the regulated power supply and a digital voltmeter as
shown in Fig. 5-1-8.
– +
5-8 E
Camera record
Any
LCD screen on the adjustment remote
Measuring equipment commander
F
18 to 1C
Digital voltmeter
+
–
Regulated power supply
+
–
(6.10 ± 0.1 Vdc)
Battery terminal
Fig. 5-1-8