2-5-10. VHS FREQUENCY RESPONSE ADJUSTMENT
TP
ADJ.
MODE
INPUT
VR3305
SP/LP (SELF VIDEO SWEEP
VIDEO
(SP)
SIGNAL
OUT
VR3304
RECORDED) (Shown in
(LP)
PLAYBACK Fig. E7)
TAPE
M. EQ.
SPEC.
OSCILLO-
BLANK SCOPE/
SP: o+-1 (dB) (90-110%)
VIDEO
TAPE
SWEEP
LP: o+-1(dB) (90-110%)
GENERATOR
Note: 1. Set the Video Sweep Signal as shown in Fig. E7.
2. Set the Al and S-VHS SW to OFF position.
3. Set the VIDEO MODE SW to B/W position.
CONDITION: BURST SIGNAL OFF
75 ohm TERMINATED
Fig. E7
Fig. E8
2-10
2-5-11. RF PEAK FREQUENCY ADJUSTMENT
TP
ADJ.
MODE
INPUT
VIDEO
PP3011-18
VR3307
PLAYBACK SWEEP
SIGNAL
(PP3014-14)
TAPE
M. EQ.
SPEC.
OSCILLO-
ALIGNMENT
SCOPE/
SIGNAL LEVEL AT 7 MHz
TAPE
VIDEO
PORTION IS MAXIMUM
(VFJ8125H3F) SWEEP
GENERATOR
Note: 1. Connect the Service Circuit as shown in Fig. E9.
2. Disconnect P501 (from MAIN C.B.A. to HEAD AMP
PACK C.B.A.).
3. Set VR3302 to centre position.
4. Connect a jumper wire between PP3011-5 and
GND.
•
5. Set the Video Sweep Signal Generator (video
signal only) as shown in Fig. E10.
6. Supply set up video sweep signal to PP3011-14 via
Service Circuit.
7. Adjust VR3307 until the signal level at 7 MHz
portion is miximum as shown in Fig. E11.
8. After this adjustment, connect P501.
(Example)
75 ohm: ERDS2T J750
1 Kohm: ERDS2T J102
47Kohm: ERD2TJ473
0.01 µ: ECCF1H104ZF
47P: ECCF1H470JC
6V47µ: ECEA0JK470
Fig. E9
Fig. E10
4.8+-
0.1V
INPUT
•
Содержание NV-HS1000
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