Sanyo M-G12 User manual

SERVICE MANUAL
STEREO
CASSETTE RECORDER
Power Source
DOS Det het hepsi eethate dye Anakaaciave 6V
(UM-3, HP 7, AA Cell, Mignonzelle, R 6) x 4
Output Power .......0.0000.c ccc cece e ee 30mW x 2 (Max.)
Current Consumption (at Vol. Min.)
Playback mode ...................0.0005. 140mA
Fast Forward/Rewind mode............ 170mA
Tape Speed 2.0.0.0... cece cece ees 1-7/8ips.+ 3%
Fast Forward/Rewind Time .............. 160sec. (with C-60)
Torque
PIAVDACK si.00seieateds cool een occu te 32 ~ 60g-cm
Fast Forward/Rewind ................... more than 50g-cm
—Specifications subject to change without notice.—
142 385 07
Wow & Flutter ......0.... 0... e cece eee 0.55%, RMS
Frequency Response (Playback)
POQOS cen Gucevin See eantascdiaeteasonia ns 63Hz ~ 8,000Hz
MGs ies ues aalonas ad bandana aus ee 63Hz ~ 10,000Hz
Signal to Noise Ratio (with Fe2Os) ...... more than 40dB
Crosstalk (with Fe203)
Tack40 Track. scjccssesizicssiveme ass: more than 53dB
Channel Separation (with Fe2O3) ....... more than 30dB
Hum & Noise (at Vol. Min.) ..........0..... —38dBs
Terminal Impedance
FICAGDNONG bcdc ical cidedeacaseaendcouseres 320,
WM-9390

DISASSEMBLY INSTRUCTIONS
GENERAL REMARKS
e Before disassembling the unit, spread a soft rubber mat or a
cloth on the workbench to avoid scratches and grease stains.
LED
e Donotusea material which is likely to cause static electricity
because transistors and ICs may be easily damaged by it.
e Reassemble the unit, noting the kinds of screws, the solder-
ing and arrangement of the leads. Refer to “Circuit Diagram
and Exploded Views” for correct assembly.
Orange
e
Before
disassembling
the
unit,
take
out
the
cassette
tape
rH
and the batteries. White
CABINET BOTTOM REMOVAL
1. Open the Cassette Compartment Lid by pressing the Stop
Button and take out the cassette tape from the Compartment.
2. Turn over the unit with front side down on a soft surface and
remove the Battery Compartment Lid. Then, remove the (6)
batteries.
®
3. Remove the five screws (1 ~ 5) fastening the Cabinet b Amplifier P.C.Board
Bottom and lift the Cabinet Bottom away from the unit.
Cabinet Bottom 4
3. Turn over the P.C.Board toward the front of the unit with cau-
tion not to damage the Playback Head, Motor and Battery
Terminal leads.
4. Reassembie in reverse order.
NOTE:
When unsoldering the removed lead wires, refer to the wiring
4. Reassemble in reverse order. diagram to avoid miswiring.
AMPLIFIER P.C.BOARD REMOVAL MECHANISM CHASSIS REMOVAL
1 Follow the instructions for the “Cabinet Bottom Removal”. 1. Follow the instructions for “Cabinet Bottom Removal” and
“Amplifier P.C.Board Removal”.
2. Remove the screw (6) fastening the P.C.Board and unsolder
the LED leads (White and Orange) from the P.C.Board to pro- 2. Remove the two posts (7 and 8) and the screw (9) holding
tect the LED indicator. the Mechanism Chassis.

Cabinet Top
DISASSEMBLY INSTRUCTIONS (continued)
Mechanism Chassis
. After the Cassette Compartment Lid is opened, set the
mechanism in the playback mode by pressing the Play
Button.
. To detach the Mechanism Chassis, lift the Mechanism Chas-
sis in the direction of the arrow until the Play Button is re-
moved from the button hole of the Cabinet Top. Then, left the
motor side of the Mechanism Chassis away from the Cabinet
Top.
Reassemble in reverse order.

ADJUSTMENTS
GENERAL REMARKS
Before adjusting the mechanism of this unit, wipe the tape
contacting surfaces of the Head, Pinch Roller and Capstan,
and the surfaces of the driving parts such as the Drive Belt,
Take-up Belt, Flywheel and Pulley with a soft cloth soaked in
alcohol. Trouble may occur because of oil and grease stains.
Carefully handle the belt because grease easily attaches to
it. Then, check the used rubber parts. If the rubber has dete-
riorated or is scratched, replace the parts with new ones.
NOTES ON HANDLING THE CHIP ELEMENT
Pay due caution to the following items:
1.
Chip Element
Solder
2.
Do not use the removed chip element again.
Chip Element
Solder
YU)
x O
(Incorrect) (Correct)
P.C.Board
Use a soldering iron of less than 30W.
* The soldering iron should not touch the body of the chip
element.
Complete soldering in a short time.
Apply solder to the chip element as illustrated below.
EQUIPMENT REQUIRED
VTVM
Frequency Counter
Dummy Load (330 )
Test Tapes
* 3kHz test tape (Example: TEAC MTT-111) for the Tape
Speed Adjustment
* 10kHz test tape (Example: TEAC MTT-114) for the Head
Azimuth Adjustment
Alignment Tool
NOTE:
Before the Electrical Adjustments, set the unit as follows:
<i TORE SWICD): tc2 avd Radeakntn escllcarenuddets ouiece bout ves HIGH
* Mute Switch ........... ccc cece cece ec eeccneceueeeuceuavens OFF
* Balance Control ................0ceceeeee O (Center Position)
*
Supply a regulated DC 6V power to the Ext. Power Jack.
TAPE SPEED ADJUSTMENT
1.
Remove the Battery Compartment Lid and take out the bat-
teries from the compartment, and connect the regulated DC
6V power supply to the Ext. Power Jack.
Connect a frequency counter to the Headphones Jack as il-
lustrated and insert a 3kHz test tape (Example: TEAC
MTT-111) into the Cassette Compartment.
Frequency Counter
3kHz
PHONES
©
Dummy Load 330
3. While playing back the test tape, adjust the tape speed by
Potentiometer for
Tape Speed Adjustment
turning the potentiometer (P301) on the P.C.Board with an
alignment tool until the frequency counter reads 3kHz.

ADJUSTMENTS (continued)
HEAD AZIMUTH ADJUSTMENT
1. Open the Cassette Compartment Lid and remove the Azi-
muth Cover from the Lid by pushing it with a tweezers in the
direction of the arrow.
Cassette
Compartment Lid
Azimuth Cover
2. Connect two VTVMs and a synchroscope to the Headphone
Jack as illustrated.
Set the synchroscope as follows:
Pi MMOD vc crease partner tecerin cnet neato. CHOP (chopped)
* “SOURCE +8 acs c acess INT (internal), CH1 or CH2
* AUTO (automatic)
Dummy Load 330,
qn)
Dummy Load
330
anny
IM
jaa=
@
PHONES
3. Insert a 10kHz test tape (Example: TEAC MTT-114) into the
Cassette Compartmnt and play it back. :
—5-—
Azimuth Adjusting Screw
4. While playing back the test tape, slowly turn the azimuth ad-
justing screw until the amplitudes of both channel output
wave forms become maximum and the wave forms overlap
as well as possible in the maximum condition of the VTVM as
iilustrated.
Adjustment
Adjustment
S ry”) Playback Head
5. After the adjustment, secure the adjusting screw with paint
or glue.

PARTS LIST
ner Part No. Description Q’ty
PACKAGE
141 6 1419 65300 —_ individual Carton |
141 6 1449 82600 Styrofoam Case |
141 6 2519 08015 Poly Cover 80 x 150 1
141 6 3919 42000 Plain Pad |
141 6 2519 12090 Poly Cover 2
141 6 4559 00100 Serial No. Sheet 3
141 6 4729 37300 Red Label (Red) 3
ACCESSORIES
4 1529 70240 Headphones 1
141 0 1259 02700 _ Belt Clip Assy 1
141 2 1769 05100 Shoulder Strap 1
141 2 1819 13900 Carrying Case 1
141 6 4519 07700 Warranty Card 1
141 6 4729 37321 POP Label 1
141 6 4119 31586 Instruction Manual 1
HEADPHONES
ss 4 1529 70240 Headphones 1
1 141 2 1769 06800 ‘Slider 1
2 141 2 8219 32600 Stopper 2
3 141 2 1769 06700 Hanger, Left 1
4 141 2 1769 06701 Hanger, Right 1
5 141 2 1259 04900 Housing 2
6 4 1529 70280 Ear Speaker 2
7 141 2 2449 44200 Baffle 2
8 141 2 4469 41900 Ear Pad 2
9 4 2369 73640 Plug Cord 1
10 141 2 3529 38200 Slide Adjustor 2
CABINET
141 2 2449 45800 Sheet 1
141 2 2899 14000 Adhesive Sheet 1
CAI 141 0 1119 88106 Completed Cabinet Top (Silver) 1
CAI 141 0 1119 88105 Completed Cabinet Top (Red) |
CA2 141 2 4219 10602 Screw (Silver) +M1,7x4.0 1
CA2 141 2 4219 10601 Screw (Red) +M1.7x4.0 1
CA3 4 2029 71160 LED, SLP-151B (Battery) (D1] 1
CA4 141 2 2419 27400 Azimuth Cover (Silver) 1
CA4 141 2 2419 27402 Azimuth Cover (Red) 1
CA5 141 2 7539 24300 Post 2
CA6 4 1329 78100 Amplifier P.C.B. Assy [See PCB1] (Silver) 1
CA6 4 1329 78105 Amplifier P.C.B. Assy [See PCB1] (Red) 1
CA7 141 2 4419 14901 Sheet 4
CA8 141 2 4219 08900 Screw 1
CA9 141 2 1639 50500 Volume Knob (Silver) |
CAS 141 2 1639 50501 Volume Knob (Red) 1
CA10 141 2 4469 39000 Cushion 1
CA11 [phone] Mute Button 1
CA12 141 2 1649 19800 Tone Knob (Silver) 1
CA12 141 2 1649 19801 Tone Knob (Red) 1
CA13 141 0 1119 88200 Cabinet Bottom Assy (Silver) 1
CA13. 141 0 1119 88202 Cabinet Bottom Assy (Red) 1
CA14 = 141 2 2149 18300 Cabinet Bracket 1
CA15 141 2 4219 27200 Screw +M1.7x5.0 1
CA16 §=141 2 1339 28600 _ Battery Lid (Silver) 1
CA16 141 2 1339 28602 Battery Lid (Red) 1
CA17 141 2 4469 43200 Cushion 1
CA18 141 2 4219 30000 Screw (Silver) +M2.0x10 2
CAi8 141 2 4219 30001 Screw (Red) +M2.0x10 2
|
oO)
|
Ref.
No. Part No. Description Q’ty
CX1 101 3 1302 00711 Screw, Pan Hd. +M2.0x7 1
CX2 101 3 1702 00614 Screw, Bind Hd. (Silver) +M2.0x6 2
CX2 101 3 1702 00618 Screw, Bind Hd. (Red) +M2.0x6 2
CX3 110 3 2101 70013 Spring Washer-2 M1.7 1
CX4 127 3 1317 04014 PI Screw-1, Pan Hd. +M1.7x4.0 1
NOTES:
1. Parts order must contain Model Number, Part Number and
Description.
2. Ordering quantity of screws and resistors must be multiple c
10 pcs.

CABINET EXPLODED VIEW

HEADPHONE EXPLODED VIEW

Ref.
No.
MC1
MC2
MC3
Mc4
MC5
MC6
MC7
MC8
MC9
MC10
MC11
MC12
MC13
MC14
MC15
MC16
MC17
MC18
MC19
MC20
MC21
MC22
MC23
MC24
MC25
MC26
MC27
MC28
MC29
MC30
MC31
MC32
MC33
MC34
MC35
MC36
MC37
MC38
MC39
MC40
MC41
MC42
MC43
MC44
MC45
MC46
MZ1
MZ2
MZ3
Part No.
MECHANISM
141 0 3119 21600
141 2 4459 26800
141 2 4219 23300
4 5279 71240
141 2 4539 27601
141 0 7419 36700
141 2 8519 07500
141 2 3529 36500
141 2 8519 47400
4 2429 72250
141 2 4219 24500
141 2 8559 02500
141 0 5369 01900
141 2 4839 17500
141 2 4539 30600
141 2 5519 47200
141 0 5459 02000
141 2 8529 11600
141 2 4539 19800
141 0 5219 09400
141 2 5649 20600
141 0 5219 03701
141 2 7319 54700
141 0 7419 36600
141 0 7419 36500
141 2 7439 31000
141 2 3519 60800
141 2 8549 06800
141 2 8519 71200
141 2 8549 18200
141 2 4219 29900
141 2 7439 31100
141 0 3519 21500
141 2 3229 40300
141 2 4579 01400
141 2 4539 13000
141 2 5519 47000
141 2 5649 09900
141 0 5319 07300
141 2 8529 11700
141 2 7439 30700
141 2 5519 47500
141 2 4539 15700
141 0 7419 36400
141 2 5519 47100
141 2 4539 31500
101 3 1802 00311
101 3 2502 00611
112 3 1301 50082
MECHANISM PARTS LIST
Description
Chassis Assy
Cushion, Motor
Screw
Motor [M1]
Washer
Play Lever Assy
Spring, Stop Lever
Base Head
Spring, Head
Play Back Head [HD1]
Screw
Spring, Supply
Supply Reel Assy
Washer
Washer
F.FWD Gear
Pinch Roller Assy
Spring, Pinch Roller
Washer
Flywheel Assy
Drive Beit
Sub Flywheel Assy
Lock Plate
Stop Lever Assy
Rewind Lever Assy
Review Arm
Plate
Spring, Lock Plate
Spring
Spring
Screw
Power Arm
Reel Plate Assy
Shield Plate
Washer, Take-up Pulley
Washer
Take-up Pulley
Take-up Belt
Take-up Reel Assy
Spring, ASO Cancel
Take-up Arm
Take-up Gear
Washer
Fast Lever Assy
Fast Gear
Washer
Screw, Truss Hd.
Screw, Cylinder Hd.
E Ring
M6.0x10x0.25
+M2.0x3
-M2.0x6
M1.5
Q’ty
en ee ee ee ee ne ee ee en ee ee ee ee a ee OO Ok Ce a a a a a an a a. a mrs
NOTES:
1. Parts order must contain Model Number, Part Number and
Description.
2. Ordering quantity of screws and resistors must be multiple of
10 pcs.

MECHANISM EXPLODED VIEW
(Chassis Top)
&——me14
MC13
—— M12
——-G
MC21
MC20