Pioneer RT-1011L Service Manual

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Pioneer RT-1011L Specifications

General

Track System	4-track, 2-channel stereo
Tape Speed	3.75 ips / 7.5 ips
Reel Size	7 inch
Frequency Response	30 Hz - 18 kHz
Wow and Flutter	0.08%
Input	Line
Output	Line
Inputs	1 x Line, 1 x Mic
Outputs	1 x Line, 1 x Headphone
Semiconductors	Transistors

Summary

1. Specifications

2. Parts Identification

3. Circuit Descriptions

3.1 Playback Circuit (Fig. 1)

Detailed explanation of the three-stage direct coupled playback amplifier circuit.

3.2 Recording Circuit (Fig. 2)

Describes the two-stage direct coupled input amplifier for MIC and LINE signals.

3.3 Oscillator Circuit (Fig. 3)

Explains the oscillator circuit's operation and feedback mechanism.

3.4 Control Circuit (Fig. 4)

Details the function of relays RL601, RL602, and RL603 in controlling operations.

3.5 Pause Circuit (Fig. 12)

Explains the circuit that prevents overheating by dropping solenoid current.

3.6 Function Buttons Release Circuit (Fig. 13)

Describes the circuit that automatically releases depressed function buttons.

3.7 Tape Speed Switching-Over

Details how the capstan motor speed is switched by altering the number of poles.

4. Disassembly

4.1 Back Covers (Fig. 14)

Instructions for removing the back covers (A) and (B) for internal access.

4.2 Side Boards (Fig. 15)

Steps to remove the sideboards for access and adjustment.

4.3 Amplifier Panel (Fig. 16)

Procedure for removing the amplifier panel, allowing meter replacement.

4.4 Mechanical Panel (Fig. 17)

Steps for disassembling the mechanical panel and its components.

5. Trouble Shooting

5.1 Transport Mechanism and Control System (1)

Troubleshooting guide for power supply, lamps, and playback issues in the transport system.

5.2 Transport Mechanism and Control System (2)

Troubleshooting for reel motors, pinch roller, capstan motor, brake, and function buttons.

5.3 Electronic Circuit Trouble

Troubleshooting guide for common electronic circuit faults like no playback sound or distortion.

6. Mechanical Adjustments

6.1 Reel Base Height Adjustment

Procedure for adjusting reel base height after motor replacement or incorrect alignment.

6.2 Brake Adjustment

Steps for adjusting brake friction when tape slackens or motors are replaced.

6.3 Take-Up and Back Tension Torque Adjustment

Detailed adjustment of take-up and back tension torque for playback and fast forward.

6.4 Pinch Roller Pressure Adjustment (Figs. 22, 23)

How to adjust pinch roller pressure for proper tape contact with the capstan.

7. Tape Head Adjustments

7.1 Course Adjustment (Figs. 24, 25)

Adjusting head height, tilt angle, and azimuth for proper tape contact.

7.2 P.B. Head Adjustment (Fig. 25)

Procedure for adjusting the playback head for maximum output level.

7.3 Rec. Head Adjustment (Fig. 25)

Steps for adjusting the record head for maximum playback level.

8. Circuit Adjustments

8.1 Playback Sensitivity Adjustment (Fig. 26)

Adjusting playback level controls to achieve the specified output voltage.

8.2 Playback Equalizer Adjustment (Figs. 26, 27)

Adjusting semi-fixed resistors for correct playback equalizer response.

8.3 Playback Frequency Response Confirmation

Verifying the playback frequency response after equalizer adjustment.

8.4 Bias Oscillator Amplitude Adjustment (Fig. 26)

Adjusting VR403 to set the correct oscillator voltage for recording.

8.5 Bias-Trap Adjustment (Fig. 26)

Adjusting L401 and L402 for minimum amplitude on the oscilloscope.

8.6 Recording Bias Adjustment (Fig. 26)

Adjusting recording bias for optimal tape performance at different speeds.

8.7 Erase Head Dummy Adjustment (Fig. 26)

Adjusting oscillator frequency for identical values in stereo recording.

8.8 Level Meter Calibration (Fig. 26)

Calibrating the level meter to indicate "0" at the specified input signal.

8.9 Recording Sensitivity Adjustment (Fig. 26)

Adjusting VR101/VR102 to match playback level to recording level.

8.10 Rec. and P.B. Frequency Response Adjustment (Figs. 26,28)

Adjusting inductors for specified frequency response across different tape speeds and bias settings.

9. Selection of Line Frequency and Voltage for FV model

9.1 Selection of Line Frequency (Figs. 29, 30)

Instructions for setting the line frequency by adjusting drive belt and switches.

9.2 Switching Line Voltage Setting and Fuse (Figs. 30, 31)

Guide to switching line voltage and replacing fuses for different power requirements.

10. Schematic Diagrams, P.C. Board Patterns and Parts Lists

10.1 Connection Diagram (Amplifier)

Shows the interconnections between various amplifier circuit boards.

10.2 Schematic Diagram (Amplifier)

Detailed circuit diagram for the amplifier sections, including component values.

10.3 Connection Diagram (Control)

Illustrates the wiring connections for the control circuits (FV and KU models).

10.4 Schematic Diagram (Control)

Provides circuit diagrams for the control assemblies (FV and KU models).

10.5 Electric Parts

Lists all electrical components used in the unit with their part numbers.

10.6 P.B. Amplifier Assembly (RWF-028)

Circuit diagram and parts list for the playback amplifier assembly.

10.7 Rec. Amplifier Assembly (RWF-029)

Circuit diagram and parts list for the recording amplifier assembly.

Parts List of P.B. Amplifier Assembly (RWF-028-0)

Detailed list of capacitors and resistors for the P.B. Amplifier.

Parts List of REC Amp Assembly (RWF-029-0)

Detailed list of capacitors and resistors for the REC Amplifier.

10.8 Control Assembly (RWG-046) for FV MODEL

Circuit diagram for the FV model control assembly.

Parts List of Control Assembly (RWG-046-0)

List of capacitors and resistors for the RWG-046 control assembly.

10.9 Control Assembly (RWG-047) for KU MODEL

Circuit diagram for the KU model control assembly.

Parts List of Control Assembly (RWG-047-0)

List of capacitors and resistors for the RWG-047 control assembly.

10.10 Switch Circuit Assembly (RWS-024)

Circuit diagram for the switch circuit assembly.

Parts List of SW Assembly (RWS-024-0)

List of resistors, diodes, and other parts for the switch assembly.

10.11 EQ. Switch Circuit Assembly (RWS-027) for FV model

Circuit diagram for the FV model EQ switch circuit assembly.

10.12 EQ. Switch Circuit Assembly (RWS-026) for KU model

Circuit diagram for the KU model EQ switch circuit assembly.

Parts List of EQ, SW Assembly (RWS-026)

List of capacitors, spark killers, resistors, and fuses for the EQ/SW assembly.

10.13 OSC. Assembly (RWA-021)

Circuit diagram for the oscillator assembly.

Parts List of OSC. Assembly (RWA-021-0)

Detailed list of capacitors and resistors for the oscillator assembly.

10.14 Fuse P.C. Board Assembly (RWX-061)

Diagram and parts list for the fuse P.C. board.

10.15 Rec. Lamp P.C. Board Assembly (RWX-058)

Diagram and parts list for the REC lamp P.C. board.

10.16 Shut-off Switch P.C. Board Assembly (RWX-047)

Diagram and parts list for the shut-off switch P.C. board.

10.17 Motor Fuse Board Assembly (RWX-048)

Diagram and parts list for the motor fuse board assembly.

11. Exploded Views and Parts Lists

11.1 Panel and Back Cover

Exploded view and parts list for the front panel, back covers, and related components.

11.2 Mechanism (Drive Motor, Head)

Exploded view and parts list for the mechanism including drive motors and heads.

11.3 Mechanism (Amplifier Assembly)

Exploded view and parts list for the amplifier assembly mechanism.

11.4 Mechanism (Reel Motor)

Exploded view and parts list for the reel motor mechanism.

11.5 Packing

Details on the packing materials and procedures for shipping the unit.

12. Level Diagrams