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CFS-B7SMK2
E Model
SERVICE MANUAL
RADIO CASSETTE-CORDER
MICROFILM
SPECIFICATIONS
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MF-B7S-148
Frequency range
FM : Saudi Arabia
87.6 ­ 107 MHz
Other countries 87.6 ­ 108 MHz
MW : 530 ­ 1,605 kHz
SW1 : 2.3 ­ 7 MHz
SW2 : 7 ­ 22 MHz
Aerials
FM/SW : Telescopic aerial
MW
: Built-in ferrite bar
Recording system
2-track, 4-channel stereo
Frequency response
70 ­ 10,000 Hz
Speakers
Full range : 10 cm (4 inches) dia,
2.8 ohms cone type
× 2
Output
Headphones jack (stereo minijack),
for 16 ­ 68 ohms impedance headphones
Maximum Power output
2.5 W + 2.5 W
Battery life
FM Recording : Sony R20P : Approx.
16 hours/Sony LR20 alkaline :
Approx. 36 hours
Playback
: Sony R20P : Approx.
8 hours/Sony LR20 alkaline :
Approx. 21 hours
Power requirements
110 ­ 120 V/220 ­ 240 V AC
selectable, 50/60 Hz
Power consumption
AC 14 W
Dimensions
Approx. 500
× 155 × 164 mm (w/h/d)
(193/4
× 61/
8
× 61/
2
inches) incl.
projecting parts and controls, not incl. handle
Mass
Approx. 2.7 kg (5 lb 15 oz) not incl. batteries
Supplied accessory
Mains lead (1)
Design and specifications are subject to change without
notice.
Ver 1.0
1998. 11


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TABLE OF CONTENTS
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK
! OR DOTTED LINE WITH
MARK
! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
1.
GENERAL
Location of Controls ··························································· 3
Listening to the Radio ························································ 3
Playing a Tape ···································································· 3
Recording ··········································································· 4
Choosing Power Sources ···················································· 4
2. DISASSEMBLY
2-1.
Front Cabinet Assy ····························································· 5
2-2.
Chassis (Tune) ···································································· 5
2-3.
Tape Mechanism Block ······················································ 6
2-4.
Tuner, AC, Second Board ··················································· 6
2-5.
Audio, Mic Board ······························································· 7
2-6.
Dial Pointer Setting ···························································· 7
3.
MECHANICAL ADJUSTMENTS ···························· 8
4.
ELECTRICAL ADJUSTMENTS
4-1.
Tape Section ······································································· 8
4-2.
Tuner Section ······································································ 9
5.
DIAGRAMS
5-1.
Circuit Boards Location ··················································· 11
5-2.
Printed Wiring Board --Tuner Section -- ······················· 12
5-3.
Schematic Diagram --Tuner Section -- ·························· 13
5-4.
Schematic Diagram -- Audio Section -- ························· 15
5-5.
Printed Wiring Board -- Audio Section -- ····················· 17
6.
EXPLODED VIEWS
6-1.
Front Cabinet Section ······················································· 19
6-2.
Rear Cabinet Section ························································ 20
6-3.
Mechanism Deck Section (1) ··········································· 21
6-4.
Mechanism Deck Section (2) ··········································· 22
6-5.
Mechanism Deck Section (3) ··········································· 23
6-6.
Mechanism Deck Section (4) ··········································· 24
7.
ELECTRICAL PARTS LIST ··································· 25


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This section is extracted
from instruction manual.
SECTION 1
GENERAL


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SECTION 2
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
2-1. FRONT CABINET ASSY
2-2. CHASSIS (TUNE)
· The equipment can be removed using the following procedure.
Set
/ Front cabinet assy / Chassis (TUNE) / Tape mechanism block / Tuner, AC, Second board /
Audio, Mic board
4 chassis (TUNE)
indicator
indicator
slider, D
1 knob (TUNE)
2 knob (BAND)
3 BVTP 3
× 10
Note : Be careful when removing
as it is engaged as shown
in Fig. A and Fig. B.
Fig. A
Fig. B
2 BVTP 3
× 12
3 BVTP 3
× 16
4 BVTP 3
× 12
5 BVTP 3
× 12
6 CN912
7 front cabinet assy
1 lid, battery case