13-3.Recording Current And Frequency Characteristic Adjustment; 13-4.Confidence Pb Adjustment - Panasonic AJ-D610WBP Service Manual

13-3. Recording Current and
Frequency Characteristic
Adjustment
BOARD
RF
TP
PB ENV (50 ohm terminated)
HSW (Trigger)
ADJUST EVR
INPUT Internal Color Bar
MODE PLAY, REC
TAPE VFM3580KM (NTSC)
VFM3680KM (PAL)
Blank Tape
M. EQ. Oscilloscope, Spectrum Analyzer
SPEC. As shown below
Spectrum Analyzer Setting
Refer to 13-2. Adjustment Setting.
EVR Setting
COM:[02] DATA:[BB] ADR:[1E] (REC_FRE. L)
COM:[02] DATA:[BB] ADR:[1F] (REC_FRE. R)
COM:[02] DATA:[80] ADR:[20] (REC_CUR. L)
COM:[02] DATA:[80] ADR:[21] (REC_CUR. R)
1. Playback an alignment Tape and observe HSW
and PB ENV (50ohm termination).
* Observe PB ENV by an Oscilloscope and supply
HSW to a Spectrum Analyzer.
PB
HSW
2. Supply PB ENV signal to a Spectrum Analyzer and
set 30 times averaging mode then save in the
TRACE B.
3. Eject the alignment Tape and insert a Blank Tape
and record a signal.
4. Release the averaging mode and change to
TRACE A mode. Observe the recording envelope
signal on the Spectrum Analyzer. (No averaging)
5. Set the EVR as shown below.
CMD :[02] DATA :[80] ADR :[20] (REC CUR L)
CMD :[02] DATA :[80] ADR :[21] (REC CUR R)
Press the [→] or [←] key in EVR so that the level of
confidence PB at 5MHz is 4dB lower than that of
TRACE B.
6. Set the EVR as shown below.
CMD :[02] DATA :[BB] ADR :[1E] (REC FRE L)
CMD :[02] DATA :[BB] ADR :[1F] (REC FRE R)
X20mV/div
ELE-48
Press the [←] key in EVR until the level at 20MHz
is maximized first. (Each adjustment for REC FRE
L and REC FRE R)
7. Set the EVR to REC CUR L mode.
CMD :[02] DATA :[80] ADR :[20] (REC CUR L)
CMD :[02] DATA :[80] ADR :[21] (REC CUR R)
Press the [→] or [←] so that the level at 5MHz is
the same as TRACE B. (Each adjustment for REC
CUR L and REC CUR R)
<Note>
If the level of PB part at 0-20MHz is lower than
TRACE B, adjust the [REC CUR L] so that the
spectrum of PB part is a similar figure to TRACE B
in the range less than 20MHz.
If the level of PB part at 20MHz is higher than
TRACE B, adjust so that the level of confidence PB
around 5MHz is the same as TRACE B regardless
of similarity.
Self REC-Play
Playback (Master Tape)
13-4. Confidence PB Adjustment
BOARD RF
PB ENV, HSW(B.E.R.COUNTER)
TP
(50Ωterminated)
VR400(PB L), VR401(PB R)
ADJUST
MODE REC
Blank Tape
TAPE
Oscilloscope
M. EQ.
1. Adjust the VR400 and VR401 so that the level A is
within specification in confidence PB