Sanyo M7790K - User Manual

SERVICE MANUAL
STEREO RADIO
CASSETTE RECORDER
Power Source
PG Ss Since tak aieets Salome Meme shal ae aS 120V/210V/240V (50/60Hz)
DG i tein cauistuavedttoameeout une een 10.5V
(UM-2, HP 11, C Cell, Babyzelle, R 14) x7
QOULPUL POWER 5: isis tenons sentcmsans ewes AW x 2 (Max.)
Power Consumption ............cce0eeeees 13W
Current Consumption (at Vol. Min.)
Record mode (with Metal) .............. 260mA
Playback mode ..............ccceee eee e es 210mA
Fast Forward mode ................020065 210mA
Rewind mode ..............cceeeeeeeeeees 210mA
Recording System ............cccceseeeeees AC Bias
Erasing System ...............cceceeeeeeees AC Erasing
TAP@ SPO on. cceccec ces sdenscensenntancece 1-7/8ips. +3%
WOW: Sc FIUTED oSseccau dant semslevs sae velesoutee 0.15%, WRMS
Fast Forward Time ...............c0c0s0ees 130sec. (with C-60)
REWING TIME «2s cicccsesdesevodenveeiconsess 130sec. (with C-60)
Torque
Playback ................... i 30 ~ 65g-cm
Fasthorward) sscoscsssactedinces aie akasaws & 55 ~ 180g-cm
FROWA A Givcscrteccecwisrsjiidiose rnieid stersiersoteeeisniatanceiat « 55 ~ 180g-cm
Erase Ratio (Overall, with Fe2Os) ....... 60dB
Signal to Noise Ratio (with Fe2Oa) ...... 45dB
Channel Separation (with Fe2O3) ....... 45dB
AC33
142 38002
SPECIFICATIONS
—Specifications subject to change without notice.—
Frequency Response (Overall)
FOZ Og sca sresiee ne ceescets cis tates walaethuaresciate 50Hz ~ 13,000Hz
GQ 2. cecies secu eee etaerisen cba Saws 50Hz ~ 14,000Hz
Metale cctscccsatisiemantinne steno eee onion 50Hz ~ 15,000Hz
Crosstalk (with Fe2Os)
MACK TOMMACK cies ad ties ond dasa maces sears 60dB
Harmonic Distortion (K3, with Fe203) .. 3%
Hum & Noise (at Vol. Min.) ................ —65dBs
Input Sensitivity and Impedance
NAICS sesorecians ate srttturcroe BOE nat eal aes arse aerate 0.3mV/3.9kO.
LINEN acnjaedtaticoends deat eimaabaiuciinten 300mV/100k0,
Output Level and Impedance
LINE QUT Sindee, waccus semomnancocaad xiao 550mV/2.2k0,
EXE SPOAKOR basis sssesciore:csarejsieieinierneiieseerccetenere 3,200mV/3.20,
Head Phone sservaeccarsiocnuaseentaondtad 3,900mV/320
Oscillation Frequency .................065 60kHz
Frequency Range
MW ist cteottisher enn sieedoanadeannee saemacia 525 ~ 1,605kHz
SW Karns oeariatrarc nate Saaeneeredt andes 2.3 ~ 7.3MHz
SW) Fisnoteciated tasdoeeantelenaee Sena: 7.3 ~ 23MHz
FAME oe views svastestrataausaions auconnawtnaatesnetens stoaates 88 ~ 108MHz
DIMENtONS wssicsnuieoscertecoens 437(W) x 137(H) x 99(D)mm
Weighti: mccasstae. cerscsctonaccsaecutecaceen 2.5kg ©
WM-9533
JGSE2B

Summary

SPECIFICATIONS

DISASSEMBLY INSTRUCTIONS

GENERAL REMARKS

Important precautions before and during disassembly procedures.

CABINET BOTTOM REMOVAL

Step-by-step instructions for detaching the cabinet bottom.

RADIO CHASSIS REMOVAL

Procedure for removing the radio chassis from the unit.

AMPLIFIER P.C.BOARD REMOVAL

Steps to remove the amplifier P.C. Board.

RADIO TUNER P.C.BOARD REMOVAL

Instructions for removing the radio tuner P.C. Board.

MECHANISM CHASSIS REMOVAL

Procedure for detaching the mechanism chassis.

MECHANICAL ADJUSTMENTS

EQUIPMENT REQUIRED

List of tools and equipment needed for mechanical adjustments.

GENERAL REMARKS

General advice and precautions for performing adjustments.

ELECTRICAL ADJUSTMENTS

EQUIPMENT REQUIRED

List of test equipment for electrical adjustments.

HEAD AZIMUTH ADJUSTMENT

Procedure to align the head azimuth for optimal playback.

TAPE SPEED ADJUSTMENT

How to adjust the tape speed using a frequency counter.

PLAYBACK SENSITIVITY ADJUSTMENT

Adjusting playback sensitivity for left and right channels.

OSCILLATION FREQUENCY ADJUSTMENT

Procedure for adjusting the oscillation frequency.

TUNER ADJUSTMENT

EQUIPMENT REQUIRED

Tools needed for tuner alignment procedures.

MW ALIGNMENT

Alignment steps for the Medium Wave (MW) band.

SW1 ALIGNMENT

Alignment steps for the Shortwave 1 (SW1) band.

SW2 ALIGNMENT

Alignment steps for the Shortwave 2 (SW2) band.

FM ALIGNMENT

Alignment steps for the Frequency Modulation (FM) band.

FM MPX (Multiplex) ADJUSTMENT

Procedures for FM Multiplex adjustments.

DIAL CORD STRINGING

PARTS LIST

CABINET EXPLODED VIEW

RADIO CHASSIS EXPLODED VIEW

MECHANISM PARTS LIST

MECHANISM EXPLODED VIEW

P.C.BOARD PARTS LIST

PRODUCT SAFETY NOTICE

IC & TRANSISTOR LEAD IDENTIFICATION

Sanyo M7790K Specifications

General

Brand	Sanyo
Model	M7790K
Category	Cassette Player
Language	English