Sansui A-60/A-80 Integrated Stereo Amplifier Service Manual
1. Block Diagrams
1-1. A-60 Block Diagram
This section presents the block diagram for the Sansui A-60 integrated stereo amplifier, illustrating the signal flow through various components including input selectors, head amplifiers, tone control amplifiers, power amplifiers, and speaker outputs.
1-2. A-80 Block Diagram
This section presents the block diagram for the Sansui A-80 integrated stereo amplifier, similar to the A-60, detailing the internal circuitry and signal paths.
2. Adjustments
Notes:
- Room Temperature: 18°C ~ 28°C (65°F ~ 83°F)
- For adjustment, run the unit for more than 5 minutes after the power is switched ON with level volumes at minimum.
- Before adjusting or confirming the bias current, avoid measurements where power transistors are heated.
2-1. A-60 Bias Current Adjustment
Procedure:
| Step | Subject | Measure Output | Adjust VR | Adjust For | Remark |
|---|---|---|---|---|---|
| 1 | Bias Current (L-CH) Adj. | Voltage across R71 | VR01 on F-3159 | DC 1.5 mV | Before turning ON power switch, turn VR01, VR02 fully counterclockwise. |
| 2 | Bias Current (R-CH) Adj. | Voltage across R72 | VR02 on F-3159 | DC 1.5 mV | In this adjustment, the bias current is converted into the voltage. |
2-2. A-80 Bias Current Adjustment
Procedure:
| Step | Subject | Measure Output | Adjust VR | Adjust For | Remark |
|---|---|---|---|---|---|
| 1 | Bias Current (L-CH) Adj. | Voltage across R87 | VR01 on F-3144 | DC 1.5 mV | Before turning ON power switch, turn VR01, VR02 fully counterclockwise. |
| 2 | Bias Current (R-CH) Adj. | Voltage across R88 | VR02 on F-3144 | DC 1.5 mV | In this adjustment, the bias current is converted into the voltage. |
3. Parts Location & Parts List
This section details the component layout and parts lists for various circuit boards used in the A-60 and A-80 amplifiers. Note that some capacitors and resistors may be omitted from these lists and can be found in a common parts list previously appended to Sansui manuals.
3-1. F-3159 Tone Control & Power Amp. Circuit Board (A-60)
A diagram showing the component placement on the F-3159 circuit board, along with a detailed parts list including part numbers, stock numbers, descriptions, and positions.
3-2. F-3160 Equalizer Amp. Circuit Board
A diagram showing the component placement on the F-3160 circuit board, along with a detailed parts list.
3-3. F-3163 Power Indicator Unit Circuit Board
A diagram showing the component placement on the F-3163 circuit board, along with a parts list including push switches and jacks.
3-4. F-3161 REC OUT Selector Switch Circuit Board
A diagram showing the component placement on the F-3161 circuit board, along with a parts list.
3-5. F-3162 Master Volume Unit Circuit Board
A diagram showing the component placement on the F-3162 circuit board, along with a parts list including potentiometers for volume control.
3-6. F-3109 Power Supply Circuit Board
A diagram showing the component placement on the F-3109 circuit board, along with a parts list including fuses and caution notes for fire hazard prevention.
3-7. F-3145 Equalizer Amp. Circuit Board (A-80)
A diagram showing the component placement on the F-3145 circuit board, along with a detailed parts list including transistors, FETs, and switches.
3-8. F-3144 Tone/Main Amp. and Power Supply Circuit Board (A-80)
A diagram showing the component placement on the F-3144 circuit board, along with a detailed parts list including transistors, ICs, diodes, zener diodes, capacitors, resistors, coils, and potentiometers.
3-9. F-3147 Peak Indicator Unit Circuit Board
A diagram showing the component placement on the F-3147 circuit board, along with a parts list.
3-10. F-3148 Peak Indicator Amp. Circuit Board
A diagram showing the component placement on the F-3148 circuit board, along with a parts list.
3-11. F-3146 REC OUT Selector Switch Circuit Board
A diagram showing the component placement on the F-3146 circuit board, along with a parts list.
3-12. F-3182 TAPE-2 Input Terminal Circuit Board
A diagram showing the component placement on the F-3182 circuit board, along with a parts list including input terminals.
3-13. F-3149 Power Meter Drive Amp. Circuit Board (1)
A diagram showing the component placement on the F-3149 circuit board, along with a parts list including diodes and capacitors.
3-14. F-3150 Power Meter Drive Amp. Circuit Board (2)
A diagram showing the component placement on the F-3150 circuit board, along with a parts list including diodes and capacitors.
3-15. F-3151 Master Volume Unit Circuit Board
A diagram showing the component placement on the F-3151 circuit board, along with a parts list including potentiometers for master volume control.
3-16. F-3152 Input Source Indicator Unit Circuit Board
A diagram showing the component placement on the F-3152 circuit board, along with a parts list including LEDs.
3-17. F-3153 Power Supply (Peak Indicator) Circuit Board
A diagram showing the component placement on the F-3153 circuit board, along with a parts list including diodes and fuses, with a caution note regarding fire hazard.
Note: When ordering parts, pay attention to the stock number format, as it may differ from the standard 7-digit format.
4. Other Parts
4-1. A-60 Front View
An illustration of the front panel of the A-60 model, showing controls and indicators. A parts list for the front view is provided, differentiating between silver and black models.
4-2. A-60 Top View
An illustration of the top view of the A-60 model, showing internal component layout and connections. A parts list for the top view is provided, including various components like potentiometers, switches, terminals, and the power transformer.
4-3. A-80 Front View
An illustration of the front panel of the A-80 model, similar to the A-60, with a parts list distinguishing between silver and black models.
4-4. A-80 Top View
An illustration of the top view of the A-80 model, similar to the A-60, with a parts list for internal components.
5. Schematic Diagrams
5-1. A-60 Schematic Diagram
This section contains the detailed schematic diagram for the A-60 model, illustrating the complete electronic circuitry. It includes component designators, values, and interconnections. Notes on component symbols and tolerances are provided.
5-2. A-80 Schematic Diagram
This section contains the detailed schematic diagram for the A-80 model, similar to the A-60, showing the electronic circuitry with component details and notes.
6. Packing List
This section provides a packing list for both the A-60 and A-80 models, detailing the contents of the packaging, including vinyl covers, styrofoam packing, and carton cases for silver and black models.
7. Accessory Parts List
This section lists the accessory parts included with the A-60 and A-80 models, specifically the operating instructions.
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