Vbs 1/2/3 Out Level Adjustment; Vbs 1/2/3 Out Frequency Response Adjustment - Sony CCU-700A Maintenance Manual

3-3-9. VBS 1/2/3 OUT Level Adjustment

Rank: A
Equipment:
Oscilloscope, Waveform monitor
To be extended:
VA-156 board
Preparation
• BARS button/MSU-700 → "ON"
Adjustment Procedure
• Perform adjustment in order of each channels.
VA-156 board
Test point/rear panel
VBS 1 VBS 1 OUT
VBS 2 VBS 2 OUT
VBS 3 VBS 3 OUT
(Note: Perform VBS 1 OUT Level Adjustment first.)
[For NTSC]
[For PAL]
CCU-700A
CCU-700AP
Adj point Specification
1RV1602 [For NTSC]
A = 100 ±1 IRE
1RV1603
1RV1604 [For PAL]
A = 700 ±10 mV
A
A
3-3-10. VBS 1/2/3 OUT Frequency Response
Adjustment
Rank:
C
Equipment:
Waveform monitor,Video signal
generator
To be extended:
VA-156 board
Preparation
• S1(Y SEL)/VA-156 → AUX
• BARS button/MSU-700 → "OFF"
• Connect CCU-370 Checker to CN3/VA-156 board.
• Feed the H SWEEP signal of video signal generator to R
terminal.
BNC
Connect video signal
generator
250 to
350 mV
The waveform of from 100 kHz to
10 MHz portion shall be flat
Adjustment procedure:
• Adjust the following controls nutil the specifications are
satisfied.
Test point/rear panel
VBS1 VBS1 OUT
VBS2 VBS2 OUT
VBS3 VBS3 OUT
(Note:Perform VBS1 OUT Frequency response Adjustment first.)
Specification: The waveform of from 100 kHz to 8
MHz portion shall be flat.
3-3. Video Signal System Adjustment
BNC
Terminated with 75Ω
CCU-370 Checker
500 mV
Adjustment point
1CV1501
1CV1602
1CV1603
8 MHz
3-9