Technics RS-M10 - Page 8

Overall gain
Equipment:
* AF oscillator
*VTVM
+ ATT
* Oscilloscope
* Test tape
(reference blank tape)
«+» QZZCRA for Normal
Level meter
Equipment :
*VTVM
* Oscilloscope
* AF oscillator
* ATT
MEASUREMENT & ADJUSTMENT
1. Test equipment connection is shown in fig. 18.
AF oscillator Record mode
Test tape
VTVM Oscilloscope
Fig. 18
Playback mode
Test tape y
. Place UNIT into record mode, and tape selector to normal position.
. Supply 1kHz signal (—24dB) from AF oscillator, through ATT, to
LINE IN.
. Adjust ATT until monitor level at LINE OUT becomes 0.39 V (— 7 dB).
. Using test tape, make recording.
. Playback recorded tape, and make sure the value at LINE OUT on
VTVM becomes 0.39 V.
. If measured value is not 0.39 V, adjust VR5 (L-CH), VR6 (R-CH) (See
fig. 26 on page 10).
. Repeat from step (2).
. Test equipment connection is shown in fig. 19.
LINE OUT
LINE IN
AF oscillator
Fig. 19
. Supply 1kHz signal.from the AF oscillator, through the ATT, to the
LINE. IN jack.
. Adjust ATT so that the monitor level at LINE OUT becomes 0.39V.
. Adjust VR501 (L-CH) and VR502 (R-CH) so that the level meters
indicate OdB.
Overall distortion
Equipment:
* Distortion meter
* AF oscillator
* ATT
* Oscilloscope
* Test tape
(reference blank tape)
«++ QZZCRA for Normal
+--+ QZZCRX for CrO2
+++ QZZCRY for FeCr
REMARKS
* Record/playback mode
+ INPUT level control
-» MAX
* Standard input level:
MIC-+--- ee. —72+3dB
LINE IN -- —24+3dB
DIN-+-ee++ —36+3dB
* Record mode
* INPUT level control
-.» MAX
. Test equipment connection is shown in fig. 20.
LINE IN
\ R/P head
~ aTT 6000 Record
AF oscillator mode
Test tape
LINE OUT
R/P head
Playback mode
Test tape Distortion
meter
Fig. 20
* Record/playback mode
+ INPUT level contra
-» MAX