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4-6-38. REC Current And Frequency
Characteristic Adjustment (25M Rch)
Board
RF EQ (H4)
Specification
Test Point
TP104, TG101, TP2, TG1
Adjustment
Point
Input Signal
INT SIG Color bar
Mode
REC
Tape
R/P Tape
M.EQ
Spectrum Analyzer
1. Connect the Spectrum Analyzer to the TP104(H4).
EXT TRIG. : TP2 (H4)
RECALL : REG 2
GND : TG101
2. Insert a R/P Tape and record a color bar signal.
3. Set the values as follows.
E08 REC FREQ R1 -100
E10 REC FREQ R2 -100
4. Change the item E07 REC CURR R1 and E09
REC CURR R2 until just achieve the saturation
level at 2.5MHz
The level at 2.5MHz
The saturation point
REC CURR EVR VALUE
5. Adjust E08 REC FREQ R1 and E10 REC FREQ
R2 so that the level at 10MHz is maximum.
6. Store the signal in the TRACE-B.
10. Adjust following items so that the waveform
becomes TRACE-A of the following figure.
Adjustment items
E07 REC CURR R1 , E09 REC CURR R2
7. E09 REC FREQ R1 , E10 REC FREQ R2
4.0 ± 0.5dB
TRACE B
TRACE A
2.5M
11. Add "+ 90" to the value of E07 REC CURR R1 and
E09 REC CURR R2
(Ex. In case of -50 → +40)
12. After adjustment, compare the spectrum of
Master Playback and Confidence Playback
1.0 ± 0.5dB
10M
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