Record-Playback Frequency Response Measurement; Erasing Effect Measurement - Marantz SUPERSCOPE CD-320 Service Data

cD-320
5A-19 Rtcord-PlâYback Fr.quoncY R6pont. Môt uro'
SEI UP
1. Power vottage: Only wh€n the 6 V DC pow€r
voltaæ h primâry for the unit and this power
voltâge it unâvâilabl€. use AC power suPplv
2. Input: I kHz, -60 dB signal wirh 20 dB as 0 VU
3. Playbâck output level: Sam€ âs the recorded sig'
4. Load: lvêasuring instrument inPut impedânce
5. Mearuring ouiput teminal:
LINE Ourput
6. Cassette tap€ uted: TDK AC_211, AC-511 and
soNY cs-30
P S O C E D U N E S
L Record the 1 kHz riqnâl in lhe normal recording
statê. In turn, reduce the input lev€l bv 20 dB
w i t h a n a t t e n u â Î o r . T h e n , r e c o r - d t h e 1 k H z , 4 0 H z ,
t 0 k H z , l 3 k H z , 1 4 k H z a n d l 5 k H z s i s n a l s .
2. Play the reco.ded 1 kHz signâl bâck i. thê normal
3. Let the I kHz, 20 dB-down signal level be 0 dB
as relêrence level. Read dilference of the 40 H2,
1 0 l H z , 1 3 k H z , 1 4 k H r a n d 1 5 k H 2 . i g n â l o u t p u t
levels from the I kH2 signal0 dB reference l€v€|.
4. Proce€d lor the NORMAL, CrO, and Fe-Cr poti-
rions each in the s€me manner.
5. P.oceed both for the right ând lêlt channeh in
the sâme manner.
srat{0aR0s
l . N O R M A L p o s i t i o n :
4 0 H z _ l 0 k H z
.
+ 4 , - 6 d B
w i t h D O L B Y s w i t c h a I O F F
2 . C r O : p o s i t ' o n :
4 0 H z - l 2 - 5 k H z
. - + 4 , - 6 d B
w i l h D O L B Y s w i t c h â t O F F
4 0 H z - l 2 . 5 k H z
. . + 4 , - 6 d B
w i û D O L S Y s w i t c h â t O F F
4 . N O R I V I A L C r O l a n d F e _ C r p o s i t i o n s :
4 0 H z ' - 1 2 . 5 k H z
+ 5 , - 7 d B
w i t h D O L B Y t w i t c h a t O N
58-20 Er$ing Etlêct M.aturâîunl
SET U?
1. Power voltage: Only when the 6 V DC power
voltag€ is primaty lor the unit and thit porer
vottâge is unavâilâble, us€ AC power supplY.
2. Input: 100 Hz, 60 dB signâl with +10 dB at
0 v u .
Sante as the recorded sig.
4. Loâd: Meâsuring inttrumenl input impedance
5. TAPÉ selector switch positionr NORMAL, CrO,
6. Câsrette tape used: TDK AC2l1, Ac_stl and
soNY cs'30
7 . F i h e r u s e d : 1 0 0 H z b 3 n d ' P a s s l i h e r
P E O C E O U R E S
I Ù R e c o r d t h e l 0 O H z i n p u i s i g n a l i n t h e n o r m . l
2. In turn, increas€ th€ input level bY l0dB with the
attenuôtor, and record it
3. Fêwind a half ponion ol lhê l0 dB_up râpe ând
record in no-.ignal state, or erat€, on the portion
wrth the inpur signal disconnected lrom lhe mic.o_
4. Play back in the normal plavback sÎâæ the input
rignal recorded in rhe norm.l .ècording state
5 . I n r u r n , l e l t h e 1 0 d 8 - u p r e c o r d e d t i g n . l l € v e l
be 0 d8 as relerence level. Read difference of thë
level ât the eràsed po.tion fiom the 0 dB referenc€
srar{0a80
Greâter than 55 dB.
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