Panasonic AJSD955B - DVCPRO50 STUDIO DECK, Service Manual, Page: 170 / 562

ELE-29
<Preparation>
1. From the item 4-19 to 4-22 are only for
AJ-SD955A adjustment.
2. Set the SETUP Menu as follows before starting
next adjustment.
[SETUP MENU]
070 TV SYSTEM : 625 (AJ-SD955A only)
After setting the above menu, Turn the VTR OFF
and ON in order to set the 625(PAL) mode.
4-19. Reference PLL Center
Frequency Adjustment (2)
BOARD
V OUT (F5)
TP
TP153 (VCO)[F-2]
ADJ.
VC701 (FREQ ADJ M)[E-2]
TAPE
-----
INPUT
Internal SG (CB75)
MODE
-----
M. EQ
Frequency Counter
SPEC.
17.734475MHz
±
10Hz
1. Disconnect the REF IN terminal. (No reference
signal)
2. Connect the frequency counter to TP153.
3. Adjust VC701 so that the frequency at the TP153
is in the specification.
<Note>
When the hand and so on approach too much near
VC701 in adjustment, the DC voltage sometimes
shifts.
After finishing this adjustment, connect REF IN
terminal again for next adjustment.
4-20. Reference CF Detection
Adjustment (2)
BOARD
V OUT (F5)
TP
CF OUT of Composite Signal generator
TP804(CF)[B-2], TP802(CF TP2)[A-1],
TP803(CF TP1)[A-1]
ADJ.
VR600 (CF ADJ M)
TAPE
-----
INPUT
REF VIDEO IN
Internal SG (CB75)
MODE
-----
M. EQ
Oscilloscope
SPEC.
See Figure, A=B
±
5%
1. Connect the oscilloscope CH1 to the CF output of
composite signal generator and CH2 to TP804.
2. Set VR600 to fully counterclockwise.
3. Turn it to clockwise slowly until the phase is
reversed as shown in figure.
And confirm that the “SCH” lamp on the front
panel is turned on.
4. Connect the oscilloscope CH1 to TP802 and CH2
to TP803.
5. Expand (delay) the rising edge of TP802.
6. Slowly and slightly rotate VR600 so that the
center of high portion at TP802 is positioned at
the center of high portion at TP803.
Trigger
TP802
(5Vp-p)
TP803
(5Vp-p)
A=B ± 5%
A B
Trigger
The waveform will be
Changed depending on SG.
CF OUT
TP804
Turn clockwise
slowly
Fully
Counterclockwise