Sanyo MR-1020 User Manual

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Stereo Tape Recorder
MODEL MR-1020
SERVICE MANUAL
SANYO ELECTRIC CO. LTD.
INTERNATIONAL DIVISION : SANYO ELECTRIC TRADING CO., LTD.
OSAKA, JAPAN
SPECIFICATIONS
Speed accuracy +2% Standard (7-1/2, 3-3/4 ips.)
+3% Standard (1-7/8 ips.)
Speed variation 2% Max. (start to end of reel)
Wow & flutter 0.2% Max. 7-1/2 ips. (RMS value)
0.25% Max. 3-3/4 ips. (RMS value)
0.35% Max. 1-7/8 ips. (RMS value)
Up to 2 min. for 1200 ft., on 7” reel
—70 to —72 dBm for standard rec. level on
Fast winding time
Sensitivity Mic. input
meter
AUX. input --22 to —32 dBm for standard rec. level on
meter
Power output 5 Watts each channel
(10°% dist.)
Cross-talk
Better than 40 dB
Better than 65 dB
80K Hz
At least 60 dB
Better than 40 dB without weighting network
40 mV Max. volume and tone Max.
(channel-channel)
(track-track)
Bias frequency
Erase efficiency
Signal to noise ratio
Hum & noise
DISASSEMBLY
To remove the chassis and amplifier circuit from the cabinet in order to
oil the mechanism, follow these steps:
I. Remove the amplifier part and the back of the chassis.
1. Remove the speaker box from the cabinet.
2. Place the set on a cushion with the front panel on the bottom.
3. Remove the four screw on the rear side, and the two on the
bottom (Fig. 1).
4. Open the power source cord container cover and loosen it so that
it will easily separate from the cabinet when it is raised.
5. Lift the cabinet up straight.
TI. Remove the control panel. a, the
1. Place the set so that the control panel is ontop. . ee:
2. Pull off the Tone, Volume control, Program selector knobs and
the top and bottom head covers.
3. Remove the Speed selector knob by turning it to the left.
4. Take off the eight screws from the surface of the control panel.
(Fig. 2)
5. Lift off the control panel; be careful not to touch the lead cords
for the heads or the auto stop lever.
GSAN
YO
Gain balance (channel-
channel)
Frequency response
(record/play)
3
dB
Max.
difference
(overall
record/play)
FREQUENCY (Hz)
SPEED |
-
100
|
1,000
|
3,000
|
5,000
|
10,000
7-1/2 ips.| +3 0
3-3/4 ips. | 78 0
1-7/8 ips.
Reel torque (gr/cm)
MODE
|
FEED REEL
|
TAKE-UP
REEL
Play
|
32-200
|
165-
400
Fast
|
winding
|
32-200
1650
-
2970
1.1 - 1.5K gr.
30 gr.
Pinch roller pressure
Pad pressure
E
Unscrew six
screws (A.,.F)
to
remove
the
Cabinet
Trunk,
Eig. 1

Sanyo MR-1020 Specifications

General

Brand	Sanyo
Model	MR-1020
Category	Measuring Instruments
Language	English

Summary

Sanyo MR-1020 Service Manual

Sanyo MR-1020 Specifications

Technical specifications for the Sanyo MR-1020 stereo tape recorder.

Sanyo MR-1020 Disassembly Instructions

Step-by-step guide for disassembling the Sanyo MR-1020 tape recorder.

Sanyo MR-1020 Mechanical Adjustments

Operation Button Pressure Adjustment

Procedure to check and adjust the force required for operation buttons.

Reel Base Tension Measurement and Adjustment

How to measure and adjust reel base tension for proper tape handling.

Sanyo MR-1020 Various Pressure Adjustments

Pinch Roller Pressure Adjustment

Method to measure and adjust pinch roller pressure.

FWD Roller Pressure Adjustment

Procedure to measure and adjust forward roller pressure.

Left and Right Idler Adjustment

How to adjust idler pressure for left and right sides.

Sanyo MR-1020 Electrical Adjustments

Bias Oscillator Frequency Adjustment

Adjusting the bias oscillator frequency for optimal recording.

Gain Balance Adjustment Procedure

Steps to balance gain between left and right channels.

Recording Level Indicator Adjustment

Sanyo MR-1020 Head Adjustment

Head Azimuth Positioning Alignment

Procedure for aligning head azimuth using a special tape.

Troubleshooting Chart: Electric Circuit Issues

Troubleshooting: No Playback

Common causes and corrections for a tape recorder that won't play.

Troubleshooting: Recording Issues

Diagnosing and fixing problems with recording or low volume.

Troubleshooting: Hum Issues

Identifying and resolving hum issues in the audio circuitry.

Troubleshooting: Noise and Sound Issues

Addressing noise and sound quality problems.

Troubleshooting Chart: Mechanical Issues

Troubleshooting: Capstan Not Turning

Causes and fixes for a non-rotating capstan.

Troubleshooting: Slow Rotation and Wow/Flutter

Diagnosing and correcting slow mechanical rotation and speed variations.

Troubleshooting: Fast Forward and Rewind Issues

Fixing problems with the fast forward and rewind functions.

Troubleshooting: Loud Mechanical Noise

Addressing sources of loud mechanical noise.

Sanyo MR-1020 Main Parts Location

Parts List: Cabinet, Speaker Box, Function Panel

Cabinet Parts List

List of parts for the cabinet assembly.

Speaker Box Parts List

List of parts for the speaker box assemblies.

Function Panel Parts List

List of parts for the function panel.

Parts List: Mechanisms and Heads

Flywheel and Play Mechanism Parts List

List of parts for the flywheel and play mechanism.

Operation Mechanism Parts List

List of parts for the operation mechanism.

Head System Parts List

List of parts for the head system.

Parts List: Speed Selector, Motor, Reverse, Tape Counter

Speed Selector and Auto Stopper Parts List

List of parts for speed selector and auto stopper.

Motor Components Parts List

List of parts for the motor assembly.

Reverse Mechanism Parts List

List of parts for the reverse mechanism.

Tape Counter Parts List

List of parts for the tape counter assembly.

Parts List: Mounting, Resistors, Capacitors, Semiconductors

Mounting Parts List

List of various mounting parts and hardware.

Resistors Parts List

List of resistor components.

Capacitors Parts List

List of capacitor components.

Semiconductors Parts List

List of semiconductor components.

Parts List: Transformers, Coils, Variable Resistors, Heads, Switches

Transformers and Coils Parts List

List of transformer and coil components.

Variable Resistors and Capacitors Parts List

List of variable resistors and capacitors.

Heads Parts List

List of record/playback and erase heads.

Switches Parts List

List of various switches used in the device.

Sanyo MR-1020 Mechanism Chassis Exploded View

Sanyo MR-1020 Function Bottom & Record Mechanism Exploded View

Sanyo MR-1020 Head System Exploded View

Sanyo MR-1020 Operation Mechanism Exploded View

Sanyo MR-1020 Speed Selector Mechanism Diagram

Sanyo MR-1020 Automatic Stopper Diagram

Sanyo MR-1020 Motor Assembly Diagram

Sanyo MR-1020 Mechanism Chassis Assembly Diagram

Sanyo MR-1020 Mechanism Chassis Assembly Details

Sanyo MR-1020 Respective Reel Plate (Right) Diagram

Sanyo MR-1020 Respective Reel Plate (Left) Diagram

Sanyo MR-1020 Reverse Mechanism Diagram

Sanyo MR-1020 Tape Counter Diagram

Sanyo MR-1020 Wiring Diagram

Sanyo MR-1020 Circuit Diagram