Pioneer ct 20 service manual
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Page 1
(la PIONEER
Scfiice
CIRCUIT & MECHANISM '4 C
< . 1.9-1 .. ORDER NO.
Shown in this photo is Model CT-4o. ARP- 36 9- 0
DESCRIPTIONS
STEREO CASSETTE TAPE DECK
T-4I
CT-s4o
CT-ao
CT-740
CT-ED
CT-54o
CONTENTS
1. MODEL COMPARISONS ................. 2
2. BLOCK DIAG RAMS .................... 3
3. CIRCUIT DESCRIPTIONS ................ 8
4. MECHANICAL OPERATIONS ............. 18
p'ONEER ELECTRONIC CORPORATION 4-1. Meguro 1-Chome Meguro-ku Tokyo 153. Japan
DIONEER ELECTRONICS [USA] INC. 1925 E Dom: inguez St. Long Beach. Cal-fornna 80810 U. S A.
PIONEER ELECTRONIC [EUROPE] N. V. Keecberglaan 1 2740 Beveren. Be|gi um
FIONEER ELECTRONICS AUSTRALIA RTY. LTD. 178-184 Boundary Road, Braes de, V CCOTIB 3195. Austrata
YH © MAY 1983 Printed in Japan
Page 2
1 . MODEL COMPARISONS
The same tape transport mechanism and basic electrical circuits
are used in the CT-20, CT-30, CT-40, CT-540, CT-740, and CT-
940. The different features included in each model are listed in
Fig. 1-1 below.
CT-40 and CT-940 differ only in style design (color). The
mechanism and electrical circuits are identical.
The CT-740 differs from the CT-940 in that the tape counter
is a mechanical type, the Dolby NR system is type B only,
and the headphones output has been omitted.
The CT-30 differs from the CT-40 in that the MS (Music Search)
and REC MUTE functions have been omitted, and the tape
counter is mechanical.
The CT-20 differs from the CT-30 in that the Dolby NR system
is type B only.
The CT-540 differs from the CT-740 in that the MS and REC
MUTE functions have been omitted.
The export destinations for each model are listed in Fig. 1-2.
CT-40 CT-940 CT-740 CT-30 CT-20 CT-540
MS (Music Search) function 0 O 0 .. _ _
REC MUTE (Unrecorded blank creation) function 0 O O - _ ..
B 8: C types Dolby NR system 0 O - O - -
B type Dolby NR system - -- O - O 0
Electronic tape counter (four figures LED numeric dispaly) O O - - - -
Mechanical tape caunter (three figures) - - O O O O
Headphones output 0 O - O O -
Fig. 14 Different features list
1' Model
ypo Remarks
CT40 67-940 CT-740 CT-30 CToZO CT-540
KU O O O O O 0 USA. model
KC 0 - - - O O Canada model
HE - O O - - 0 European continent model
HB - O O - - 0 United Kingdom model
HP 0 O -- O O 0 Australia model
0 O O - O o 0 General export model
DIG - - - - O - US. Military model
Fig. 1-2 Export destinations list