Ir Transmitter Adjustments; Ir Video Carrier Frequency Adjustment; (Mi-27/28 Board); Ir Video Deviation Adjustment (Mi-27/28 Board) - Sony GV-A500 Service Manual

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
TP607 of IR receiver jig (or Pin !§ of
Measuring point
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.
IR receiver jig
Main unit
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.
Frequency counter
TP607

2. IR Video Deviation Adjustment (MI-27/28 board)

Mode
Subject
Measuring point
Measuring instrument
Adjusting page
Adjusting address
Specified value
Connection of Equipment:
Connect the measuring devices as shown in the following figure,
and adjust.
IR receiver jig
Main unit
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.
5-34
VTR stop
Arbitrary
VIDEO OUT terminal of IR receiver
jig (Terminated at 75Ω)
Oscilloscope
F
73
+ 0.04
A = 0.87 V
– 0.10
Oscilloscope
75 Ω
VIDEO
OUT
75 Ω (1-247-804-11)
Fig. 5-3-20.
H
Fig. 5-3-21.
A