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2-4-6. Mode
Playback Level Check (MA-316 Board) Playback Alignment tape : SP mode color bar portion Video LINE OUT terminal Oscilloscope A=1.0 ± 0.1Vp-p (75� terminated)
Signal Alignment Measurement point Measuring instrument Specified value
2-5-1. ACE Head Adjustment Refer to the �VHS mechanical adjustment manual 11). 2-5-2. Mode Signal Measurement point E-E Output Level Check E-E
400Hz, �7.5dBs : J480 (LINE IN 2) on FR-128 board J500 (AUDIO OUT), CN500 (LINE 1) Audio level meter J500 : �7.5 ± 2.0dBs, CN500 : �6.3 ± 2.0dBs
[Check Method] 1) Check that the playback level satisfies the specified value.
Measuring instrument Specified value
A
[Check Method] 1) Input signal of 400Hz and �7.5dBs to J480 (LINE IN 2). 2) Check that the audio output level is the specified value. 2-5-3. Mode Signal Measurement point Measuring instrument Overall Output Level and Distortion Factor Check Self-record playback 400Hz, �7.5dBs : J480 (LINE IN 2) on FR-128 board CN500 (LINE 1) Pin 3 (L), Pin 1 (R) Audio level meter and Distortion meter Playback Level: �6.3 ± 3dBs Distortion: 4.0% or less MA-316 BOARD (Conductor side)
20 21 J500 AUDIO OUT CN500 LINE 1 IC530 D702 VCC 12V 25 40 41 IC201 80 Q211 64 65 24 1 SYNC AGC White/Dark Clips REC Y Level REC C Level 4 1 Tuner 30V 2 1
H
Fig. 6-2-10
2-5. AUDIO SYSTEM ADJUSTMENT � For the adjustment of the audio system, perform in the SP mode if there is no special notes. Use the alignment tape. [Connecting Instruments]
(CN500 or J500) Audio line OUTPUT L/R (J480) Audio line INPUT L/R 600 � Attenuator VTR
Specified value
Audio oscillator
Audio level meter or distortion meter 47 k�
[Check Method] 1) Input signal of 400Hz and �7.5dBs to J480 (LINE IN 2). 2) Record signal. 3) Playback the recorded portion. 4) Check that the output level is �6.3 ± 3dBs. 5) Check that the distortion factor is 4.0% or less. 2-5-4. Overall Noise Level Check Self-record playback No signal (Insert a shorting plug into the Audio LINE IN terminal) CN500 (LINE 1) Pin 3 Audio level meter (IHF-A weighing filter is used) � 45.5dBs or less
Fig. 6-2-11 � Adjust in the SP mode if there is no special indications. � Perform the adjustment setting the switch on the following positions. � INPUT SELECT switch ........................................... LINE IN 2
[Adjustment Method] 1. ACE head adjustment.....Refer to the VHS mechanical adjustment manual . 2. E-E output level check 3. Overall Output level and distortion factor check 4. Overall noise level check.
Mode Signal Measurement point Measuring instrument Specified value
E X'tal OSC
IC160
[Check Method] 1) Record. 2) Playback recorded portion. 3) Check that noise level is � 45.5dBs or less.
D160 D5V
