Sanyo M7700F Service Manual
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Sanyo M7700F Service Manual

Sanyo M7700F Service Manual

Mini am/fm stereo radio cassette recorder
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Table of Contents

SERVICE
MINI AM/FM
STEREO
RADIO
CASSETTE
Recording System .
Erasing System
Tape Speed
Fast Forward
Time
.
Rewind
Time
.
Wow
& Flutter
.
Frequency Response
NORMAL
Signal to Noise Ratio
without
DOLBY
Hum
& Noise
Less than —55dBs (Min. Vol. and Tone)
Crosstalk
Track
to Track
Channel Separation
.
Distortion
(3rd harmonic)
NORMAL
.
MANUAL
RECORDER
SPECIFICATIONS
AC Bias
AC Erasing
140sec. (C-60 cassette)
140sec. (C60 cassette)
0 25%
RMS
70
10,000Hz
Better
than
48dB
Better
than
50dB
Better
than
50dB
5%
—Specifications
SANYO
Terminal Impedance
MIC
DIN
INPUT
DIN
OUTPUT
EXT. Speaker
Headphone
Current Consumption
RECORD
mode
PLAY
mode
F. FWD
mode
R EW mode
Output
Power
Power
Source
DC
. 7.5V
Frequency Range
AM
subject to change without
notice.—
M7700F
3.3 k-ohm
3.3 k-ohm
2.2 k-ohm
3.2 - 60hm
80hm
(at Min. VR)
210mA
160mA
180mA
.
180mA
2.0/chW
(UM-2,CCell,
HP 11, R 14, Babyzellen x 5)
515—
1.630kHz
88 -
108MHz
EUROPE
141
888
02
(maximum)
WM-4143
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Summary of Contents for Sanyo M7700F

  • Page 1 SERVICE MANUAL SANYO MINI AM/FM STEREO M7700F RADIO CASSETTE RECORDER EUROPE SPECIFICATIONS Terminal Impedance Recording System . AC Bias Erasing System AC Erasing 3.3 k-ohm Tape Speed INPUT 3.3 k-ohm 140sec. (C-60 cassette) Fast Forward Time OUTPUT 2.2 k-ohm Rewind Time 140sec.
  • Page 2 DISASSEMBLY INSTRUCTIONS CABINET BOTTOM ASSEMBLY REMOVAL AMPLIFIER P.C.BOARD ASSEMBLY REMOVAL Take out the cassette tape from the compartment Follow the instructions for the Cabinet Bottom Assembly pressingthe STOP/EJECT button. Removal. Turn over the unit on a soft surface and remove the battery Unscrew the two screws (6 &...
  • Page 3 DISASSEMBLY INSTRUCTIONS (Continued) Unscrew a screw (8) fastening the P.C.Board. 4. Unscrew the two screws (9 & 10) fastening the Radio Chassis and remove the Radio Chassis by tilting it as Remove the P.C.Board by lifting the tuning knob side of it. illustrated.

  • Page 4: Cassette Compartment

    DISASSEMBLY INSTRUCTIONS (Continued) After removing the Jack Bracket and the Governor Circuit CASSETTE COMPARTMENT REMOVAL P.C.Board, remove the Chassis as illustrated Open cassette compartment pressing STOP/EJECT button. To remove the cassette compartment lid, unlock the click of the cassette compartment lid from the Cabinet Top by pressing the counter side of the lid as illustrated.

  • Page 5: Power Switch Position

    MECHANICAL ADJUSTMENTS GENERAL REMARK POWER SWITCH POSITION ADJUSTMENT Before adjusting the mechanism of this unit, wipe the tape Check to see that the Power Switch is positioned over the contacting surfaces clean as well as the contact surfaces Of center of the chassis adjusting hole as illustrated.
  • Page 6 ELECTRICAL ADJUSTMENTS REQUIRED EQUIPMENTS 3. Adjust the tape speed by turning the potentiometer (P801) on the Governor Circuit P.C.Board with an alignment tool to VT VM (two sets) Frequency Counter obtain 3,000 Hz (±3%) on the frequency counter. See the Dummy Load (470 k-ohm) illustration below.
  • Page 7 ELECTRICAL ADJUSTMENTS (Continued) Adjustment -C208 C205 R206 . R205 C206 C240 Azimuth Adjusting Screw R207 cmo.+. C209 R209 Rao , R 202 c204 R208 R203 OSCILLATOR FREQUENCY RECORDING BIAS ADJUSTMENT RIGHT CHANNEL Connect the VT VM across R 103, and the frequency counter to the output terminal of the VT VM as illustrated.
  • Page 8 TUNER ADJUSTMENT Measuring Instruments Required at FM alignment (Tuning Range and Tracking) AM Standard-signal Generator FM Standard-signal Generator Generator Scope Stereo Signal Generator Loop Antenna (Output Side) Generator Scope Dummy Antenna (300 ohm, balanced type) VTVM F requency Counter Distortion Meter e_WV_—.
  • Page 9 ADJUSTMENT (Continued) TUNER ALIGNMENT Standard test frequency 400 Hz and Modulation 30% at AM Connections Frequency Tuning Dial Step Alignment of Signal Adjustments Remarks Setting INPUT OUTPUT Generator Connect standard Obtain symmetrical curve loop antenna Connect input and maximum amplitude. Calibration output terminal...
  • Page 10 TUNER ADJUSTMENT (Continued) FM MULTIPLEX ADJUSTMENT Prior to the adjustment, set the unit as follows: Connect the VT VM with 3.2 ohm dummy load, distortion meter, and oscilloscope to the external speaker jack Of the RADiO (ON) Function Switch left channel as illustrated.
  • Page 11 TUNER ADJUSTMENT (Continued) FM MPX ALIGNMENT Standard test frequency 400 Hz and deviation 75 kHz Connections Tuning Dial Step Alignment Adjustment Remarks INPUT OUTPUT Main channel signal Maximize amplitude and VT VM of Stereo reading. Connect VT VM with Tuning Dial Stereo Pilot and Sub...
  • Page 12 DIAL CORD STRINGING DIAL CORD STRINGING Hook the dial cord to the spring and tie the cord where the Mount Radio Tuner P.C.Board on the Radio Chassis and spring extends to the center between the two scratch then, the Drum to the shaft of the variable capacitor. marks on the drum.
  • Page 13 PARTS LIST Ref. Ref. Part Q'ty Description Q'ty Part Description PACKAGE RADIO TUNER P.C.B. ASSY 4 2539 70210 Ferrite Bead 141 2 171920300 Handie 4 2539 70440 Ceramic Filter 6 1419 42900 Individual Carton Ceramic Filter 4 2539 70440 6 1449 60200 Case, Top 0.022M...
  • Page 14 PARTS LIST (Continued) Ref. Ref. Part No. Description Q'ty Part No. Description Q'ty RADIO TUNER P.C.B. ASSY RADIO TUNER P.C.B. ASSY 5 9110 18820 Diode, IS188 R 49 03251 JNOOO Carbon 10k ohm 1/4W 205 5 9040 44210 DS442 Diode. 6 1251 JNOOO Carbon...
  • Page 15 PARTS LIST (Continued) Ref. Ref. Part No. Description Q'ty Part Description Q'ty AMPLIFIER P.C.B. ASSY AMPLIFIER P.C.B. ASSY 4 2359 73470 Jack IP (Ext. Speaker, Left) 5 2500 KEOOC C203 Ceramic 0.0015MF External Power Socket (Ext.Power Socket) 4 2359 73540 C204 7 5100 OOOOV...
  • Page 16 PARTS LIST (Continued) Ref. Ref. Part Description Q'ty Part No. Description Q'ty SOCKET P.C.B. ASSY AMPLIFIER P.C.B. ASSY Socket P.C.B. Assy 4 1329 74870 R222 RD33 1251 JNOOO Carbon 1/4W Electrolytic C 141 0 5100 OOOOV RD4 7 2251 JNOOO 1/4W R223 Carbon...
  • Page 17 PARTS LIST (Continued) Ref. Ref. Part D escription Q'ty Part Description Q'ty MECHANISM MECHANISM 141 28519 75700 Spring. Pinch Roller 23119 11801 Radio Chassis 2 8519 77000 Spring, Lock Plate 2 3229 25900 Shield Plate, Volume 141 28519 77300 Spring, Actuating Record 141 2 3529...
  • Page 18 EXPLODED VIEW (Cabinet) 141 0 111962100 Cabinet Top Comp'. 141 0 1249 150m *PMS 2.6x8 Lid Cassette Assr 4 '539 7055' Micropho ne 2 2449 30200 2 163930600 Knob Volume 141 2 2449 30200 Sheet 2 1149 sc reen Speak 2 1639307m Knob Volume...
  • Page 19 EXPLODED VIEW (Continued) .pTS.' 2.6x (Radio Chassis) 1412 4729 2.6x8 2851906700 *PTS. t 2.6x8 Spy Cst CaseLever B 141 2 3679 27500 147 24419 12000 Bracket Headphone 4 2869 704 Cushion G o verner 141 2 5389 02700 2511904500 O rum Pointer *PMS 2.618 141 0 751900101...
  • Page 20 EXPLODED VIEW (Continued) (Chassis Top) 14' 2421903000 Screw 2571907800 Spxer 2 741958000 Lever Select 28519691m Spring Shutoff 1412853932800 Spring Casette 4 2429 7034 Erase Head -CMS 2x8 '41 2 3769 æooo +pMS 2x4 Seocer Head 2 472904090 4 2429 71410 SRW 20 RIP Head 1904900...
  • Page 21 EXPLODED VIEW (Continued) (Chassis Bottom) E.I.5 2 7439 14200 Lever Review 141 28519 70300 Spring Plate Pause 28519 74700 E.I.5 $ring Brake *PMS 4 2319 71861 Leaf Switch 22400 Lever FF Assy 1410 741922n) Lever Rewind Assy 09600 Lever Actuating Rec 2851950701 Spring Lever Play 28519...

  • Page 22: Ic & Transistor Lead Identification

    IC & TRANSISTOR LEAD IDENTIFICATION LA4135 FRONT VIEW BOTTOM VIEW TRANSISTOR 1234567 (Bottom View) 2SC536 2SC693 2SC1815 14 13 12 11 10 g 2SD545 gPC1018, AN7410 123456 (Bottom View) 16 15 14 13 12 11 10 9 TA7135P TERMINAL NAMES BASE (Side View) C—...

  • Page 23: Control P.c.board

    VOLUME CONTROL P.C.BOARD (Top View) VOLUME TONE BALANCE R 127 8227 C@Q-6 —O 822B WHITE R128 (Bottom View) BALANCE TONE VOLUME VR3-l AC127 VRi-l IC1281 VR3-21 I VR'-2 Ri28 VR2-2 R22B WHITE...
  • Page 24 GOVERNOR P.C.BOARD (Top View) 0801 R807 L BOI ROQ9 Reoe ' ceoj RB05 0802 0803 0804 •TH801 R 806 03 b C803 RB04 D801 L 802 (Bottom View) R807 R809 1-801 QBOI R 808 C802 ceol PBOI R805 0802 RBOI DE04 "P803 RB03...
  • Page 25 SWITCH P.C.BOARD (Top View) FUNCTION SWITCH TApE SLEEP vR214 Rt14 9210 MODE SWITCH STEREO •-c:z-— 0109 C313 FUNCTION 2 SWITCH MI C REC/PB (Bottom View) 1' FUNCTION I SWITCH R ADI O TAPE C—S2-4 92-6—4 R 214 R 114 0209 •MODE SWITCH STEREO...
  • Page 26 SCOKET P.C.BOARD (Top View) REC/PB BEAT CANCEL C31t C141 C241 C316 R 104 (Bottom View) REC/PB BEAT CANCEL cS17 C316 R104 C24i C141 -26-...
  • Page 27 SCHEMATIC DIAGRAM (Amplifier) + B 7.SV I-ch LA4135 S2-5 S2-3 2SC536 2SC1815 2SC536 S4-l 0103 RIGHT CHANNEL POWER RECORD 1.8K R106 Rt05 TA7137P EXT. MIC. JACK 6.6V C 131 C13B croa R302 C105 EXT. SPEAKER 470B C107 ¯ RI 16 R121 JACK DS442...
  • Page 28 SANYO ELECTRIC TRADING CO., LTD OSAKA, JAPAN August/'79/1 ,200 Printed in Japan...

  • Page 29: Modification Notice

    MODIFICATION NOTICE SANYO CASSETTE RECORDER M 1950 Series M 9922 Series M 9923 Series M 7700 Series M 9924 Series M 7800 Series Sep, 1983 Date Issued by The following corrections should be made in the SERVICE MANUALS and PARTS (PRICE) LIST.
  • Page 30 MODIFICATION NOTICE SANYO RADIO CASSETTE RECORDER M 7700 (USA) M 7700F M 7700 (CANADA) M 7700F (EUROPE) M 7700F (AUSTRALIA) 1980 Date Issued by The following corrections should be made in the SERVICE MANUALS and PARTS (PRICE) LIST. Description Q'ty Remad( Part No.

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