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2. A/D Clamp DC Level Adjustment
n
"A/D Clamp DC Level Adjustment" is needed for TBC-24 board of the board number suffixes 11 and 12.
Measuring equipment: Oscilloscope
(1) When the alignment tape is inserted to DNW, eject it.
(2) Connect and set the oscilloscope as follows:
CH-1:
TP202/TBC-24(C-3), 500 mV/DIV, 10 us/DIV, GND: E200/TBC-24(C-1)
CH-2:
TP102/TBC-24(F-2), 500 mV/DIV, GND: E100/TBC-24(E-2)
Display: CH-1
(3) Turn off the power of DNW, then wait for 1 minute.
(4) DC level measurement for C
Measure the DC level on the oscilloscope's CH-1 (TP202) just after turning on the power.
(5) Turn of the power of DNW, then wait for 1 minute.
(6) Change the display mode of the oscilloscope to CH-2.
(7) DC level measurement for Y
Measure the DC level on the oscilloscope's CH-2 (TP102) just after turning on the power.
Measurement point
CH-1: TP202/TBC-24(C-3)
CH-2: TP102/TBC-24(F-2)
(8) Adjustments
Playback the color-bar signal portion (14:00 to 17:00) of the alignment tape CR5-1B or CR5-1B PS,
and adjust the DC voltage level of the following measurement points as identical to the measured
voltage in steps (4) and (5). (DNW-A22: CR5-1B, DNW-A22P: CR5-1B PS)
Measurement point
CH-1: TP202/TBC-24(C-3)
CH-2: TP102/TBC-24(F-2)
(9) Stop the playback of the alignment tape CR5-1B/CR5-
1B PS or eject it.
n
It is not necessary to eject the alignment tape when
perform subsequent "3. VCO Lock-in Range Adjust-
ment.
DNW-A22/A22P
Measuring value (fill up)
Adjustment point
1RV202/TBC-24(B-2)
1RV102/TBC-24(D-2)
Note
C
Y
Note
C
Y
A
B
C
TP201
RV500
RV300
TP203
RV200
RV501
LOT No.
S No.
A No.
RV201
E200
RV102
RV202
TP202
E501
TP500
TP601
RV503
TP602
TP604
TP606
RV502
TP603
LV601
RV601
RV604
E502
TP605
TP303
TBC-24 Board (Side A) (Suffix-11 and -12)
6-7. TBC-24 Board Replacement
D
E
F
G
TBC-24
RV101
TP101
TP103
E100
TP102
RV400
RV402
TP300
TP401
TP400
E302
RV303
TP403
TP404
TP402
TP301
TP406
RV404
LV401
RV401
TP302
TP405
E301
6-95
1
2
3
4
5
6
7
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