Sony GV-A500E, Service Manual

Page: 93 / 127

5-34
3-5. IR Transmitter Adjustments
Adjust using a IR receiver jig.
Switch setting:
LASER LINK ················································ ON (Red LED is lit)
1. IR Video Carrier Frequency Adjustment
(MI-27/28 board)
Mode VTR stop
Subject Arbitrary
Measuring point TP607 of IR receiver jig (or Pin
!§
of
IC361 of MI-27/28 board)
Measuring instrument Frequency counter
Adjusting page F
Adjusting address 76
Specified value f = 11.85 ± 0.05 MHz
Connection of Equipment:
Connect the measuring devices as shown in the following figure,
and adjust.
Fig. 5-3-19.
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Set page: 3, address: 09, data: 01 and press the PAUSE button
of the adjusting remote commander.
3) Set page: 3, address: 01, data: 37 and press the PAUSE button
of the adjusting remote commander.
4) Change the data of page: F, address: 76, and set the video carrier
frequency (f) to the specified value.
5) Press the PAUSE button of the adjusting remote commander.
6) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
7) Set page: 3, address: 09, data: 00 and press the PAUSE button
of the adjusting remote commander.
8) Set page: 0, address: 01, data: 00.
Main unit IR receiver jig
TP607
Frequency counter
2. IR Video Deviation Adjustment (MI-27/28 board)
Mode VTR stop
Subject Arbitrary
Measuring point VIDEO OUT terminal of IR receiver
jig (Terminated at 75
Ω
)
Measuring instrument Oscilloscope
Adjusting page F
Adjusting address 73
Specified value A = 0.87 V
Connection of Equipment:
Connect the measuring devices as shown in the following figure,
and adjust.
Fig. 5-3-20.
Adjusting method:
1)
Set page: 0, address: 01, data: 01.
2) Set page: 3, address: 09, data: 01 and press the PAUSE button
of the adjusting remote commander.
3) Set page: 3, address: 01, data: 39 and press the PAUSE button
of the adjusting remote commander.
4) Change the data of page: F, address: 73, and set the video signal
amplitude (A) to the specified value.
5) Press the PAUSE button of the adjusting remote commander.
6) Set page: 3, address: 01, data: 00 and press the PAUSE button
of the adjusting remote commander.
7) Set page: 3, address: 09, data: 00 and press the PAUSE button
of the adjusting remote commander.
8) Set page: 0, address: 01, data: 00.
Fig. 5-3-21.
+ 0.04
– 0.10
Main unit
IR receiver jig
VIDEO
OUT
75
Ω
75
Ω
(1-247-804-11)
Oscilloscope
A
H