Sanyo MR-1020 Service Manual

Sanyo Sounds Exciting!
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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.
Gain balance (channel-
channel)
Frequency response
(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)
1.1 - 1.5K gr.
30 gr.
Pinch roller pressure
Pad pressure
E
Unscrew six
screws (A.,.F)
Eig. 1