Rec Frequency Characteristic Setting, Rec Current Adjustment, Confirmation Of Error Rate - Panasonic DVCPRO50 Service Manual

3-5. REC Frequency Characteristic Setting, REC Current Adjustment,
Confirmation of Error Rate
1. There are 8 pcs of adjustment point for Recording Current.
Each adjustment menu and TP for the adjustment is described in Chart 3-5-1.
Adjustment item
50M L1 Rec Current
INTERNAL
50M L2 Rec Current
50M R1 Rec Current
50M R2 Rec Current
25M L1 Rec Current
INTERNAL
25M L2 Rec Current
25M R1 Rec Current
25M R2 Rec Current
2. Following are the setting for the Spectrum analyzer.
RES BW
VIDEO BW
SWEEP TIME
ATTEN
CENTER FREQ
FREQ SPAN
REF LEVEL
SCALE dB/DIV
TRIGGER
Chart 3-5-2
*50Ω coaxial cable should be connected to INPUT terminal of Spectrum Analyzer.
3. All adjustment should be done with following mode.
Q60P60 VITERBI: AUTO
Q62P62: AEQ MODE : ON
<Adjustment for DVCPRO50 mode>
1. Set the Spectrum analyzer to REG1.(refer to Chart 3-5-2)
2. Set the Service menu to DVCPRO50 REC ADJUST menu.
3. Execute following adjustment for each head. (L1, L2, R1, R2)
4. Confirm that the value of REC FREQ is set to "60".
5. Set the value of REC CURR to "100".
6. Insert the blank tape and place the unit to recording mode.
7. Save the confidencial playback spectrum to Trace B.
8. Decrease the value of RECCURR so that the confidencial playback spectrum meets the following SPEC. and
memorize this menu value (Value A).
The confidencial playback spectrum =TraceB - 5db ± 1db.
9. Add "130" to Value A. (This value will be the adjustment value of RECCURR.)
ex) If the value A is "-67", "-67+130=63" will be the adjustment value of RECCURR.
10. Press the SET button.
11. Execute another head of adjustment too. (Each head (L1, L2, R1, R2) should be adjusted)
12. Set the P70: ERROR MODE to SLOW and confirm that Error rate at confidencial playback mode meets the
SPEC.. (Refer to ELE-18)
13. Set the Spectrum analyzer to REG3. (refer to Chart 3-5-3)
14. Record approximately one minute and play it back.
15. Confirm that error rate at selfrecording playback mode meets the SPEC.. (Refer to page ELE-18)
16. Save the selfrecording playback spectrum to Trace B.
17. Playback the DVCPRO alignment tape and save the spectrum to Trace A.
18. Make sure that the difference of the each level at 4MHZ portion between selfrecording playback spectrum
(Trace B) and playback spectrum (Trace A) meets the following SPEC..
The difference of the each level : 0db ± 2db
Input Menu
B00: RF ADJUST
COLOR P00: DVCPRO 50M ADJUST
BAR P-1: REC ADJUST
B00: RF ADJUST
Q00: DVCPRO
COLOR
ADJUST
BAR
Q-1: REC ADJUST
REG1 REG2
1MHz 1MHz
3KHz 3KHz
20msec 20msec
10dB 10dB
4MHz 2MHz
0MHz 0MHz
-20dB -20dB
5dB 5dB
EXT EXT
P01: RECCURR L1
P02: RECCURR L2
P05: RECCURR R1
P06: RECCURR R2
Q01: RECCURR L1
Q02: RECCURR L2
25M
Q05: RECCURR R1
Q06: RECCURR R2
Chart 3-5-1
RES BW
VIDEO BW
SWEEP TIME
ATTEN
CENTER FREQ
FREQ SPAN
REF LEVEL
SCALE dB/DIV
TRIGGER
ELE-19
Spectrum Analyzer
EXT
TP Setting
TRG
TP5301 TP5702
EQ2RF HSWEQ2 REG1
REG3
TP5501 TP5802
EQ3RF HSWEQ3
TP5301 TP5702
EQ2RF HSWEQ2
REG2
REG4
TP5501 TP5802
EQ3RF HSWEQ3
REG3 REG4
1MHz 1MHz
3KHz 3KHz
200msec 150msec
10dB 10dB
0Hz 0Hz
40MHz 20MHz
-20dB -20dB
5dB 5dB
EXT EXT
Chart 3-5-3