Contents
1 General 3
2 Mechanical Description 3
2.1 Mechanical checks and adjustments 4
2.1.1 Tape path 5
2.1.2 Brakes 5
2.1.3 Tape tension 7
2.1.4 Pinch roller 8
2.1.5 End of tape switch 8
2.1.6 Wow and flutter 9
2.1.7 Tape speed 10
2.2 Routine maintenance 10
2.2.1 Cleaning 10
2.2.2 Lubrication 10
2.2.3 Servicing of solenoids 11
2.2.4 Servicing of push button assembly 11
2.3 Removal of capstan assembly 11
3 Electronic Description 13
3.1 Circuit checks and adjustments 13
3.1.1 Measuring instruments 13
3.1.2 De-magnetising 14
3.1.3 Head alignment 14
3.1.4 Playback amplifier 16
3.1.5 Bias adjustment 17
3.1.6 Measurement of overall frequency response 18
3.1.7 VU-Meter adjustment 19
3.1.8 Adjustment of head shielding 20
3.1.9 Channel to channel crosstalk 20
3.2 Tuning the bias traps 21
4 Troubleshooting 22
4.1 Mechanical troubleshooting 22
4.2 Electronic troubleshooting 23
5 Technical Data 24
6 Circuit Diagram 26
7 SPARE PARTS LIST - ISSUE IV 39
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