Clock (74 Mhz) Duty Adjustment; Sync Output Level Adjustment - Sony HDCU-700A Maintenance Manual Supplement

3-3-3. Clock (74 MHz) Duty Adjustment

Note
. This adjustment for AT-103A board No. suffix -22 or
later is necessary.
Adjustment procedure
1. Equipment: Oscilloscope (20 MHz BWLimit: ON)
Test point: TP26 (B-6) /AT-103A board
1RV21 (B-5) /AT-103A board
Adj. point:
C = 1.65 ± 0.04 Vdc
Spec.:
A
A=B
B
HDCU-700A

3-3-4. Sync Output Level Adjustment

Preparations
. S2-1 (M-6) /RC-70 board → ON
. S2-2 (M-6) /RC-70 board → ON
Adjustment Procedures
1. 1125 HD Sync Level Adjustment
Equipment: Oscilloscope or HD waveform monitor
Test point:
Adj. point:
Spec.:
C
GND
2. 525 SD Sync Level Adjustment
Equipment: Oscilloscope or NTSC waveform
Test point:
Adj. point:
Spec.:
A B C
RV6
RV5
TP7
3-3. Video and Reference Signal System Adjustment
1125 HD Sync connector/DIF-40 board
1RV9 (E-3) /DIF-40 board
A = 600 ± 5 mV p-p
(terminated with 75 Z)
monitor
525 SD Sync connector/DIF-40 board
1RV10 (E-3) /DIF-40 board
B = 286 ± 2 mV (40 ± 1 IRE)
(terminated with 75 Z)
E F G H J
D
RV9
1 1
RV10
RV1
RV4
RV3
TP3
DIF-40 Board (Component side)
A
B
M
K L
1
2
3
4
RV2
5
TP2
3-13 (E)