Nakamichi SR 2 A Service Manual

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CONTENTS

1. General....,... ............................. .. 1
2. Parts Location for Electrical Adjustment. . . . 8
3. Electrical Adjustments ............. . . 4
3. 1. Power Amplifier Section . . . 4
3. 2. Tuner Section 4
4. Mechanism Assy and Parts List . . . . 7
4. 1. Synthesis . . . . . . . 7
4. 2. Chassis Assy (A01) ......................... . . . . ..... . . . . ......... . . 8
4. 3. Front Panel Assy (A02) ................. . . . . 9
4. 4. Rear Panel Assy (B01) . . . 9
5. Mounting Diagrams and Parts List . . . . 10
5. 1 Power Swibch P.C.B. Assy . 10
5. 2. AC Outlet P.C.B. Ass'y . . . . 10
5. 3. Band Selector P. C B. Ass y . 10
5. 4. Volume P. C. B. Ass y ..... 11
5. 5. Loudness Switch P, C B Ass y ............... . . 11
5. 6. Speaker Switch P. C B. Ass.y . . . . . . . . 12
5. 7 Tone Control P.C.B. Assy ............... 12
5. 8 Speaker Terminal P.C.B. Assy .......... . . . 13
5. 9. Power Supply P.C.B. Assy . . . . . . 13
5. 10. Monitor Switch P.C.B. Assy ..... . 15
5. 11. Control Switch P.C.B. Assy . . . 16
5. 12. Display P.C.B. ASS'Y . . . . . . . 1'7
5. 13. Main P.C.B. Assy ........ . . 19
5. 14. Eq. Sub P.C.B. Assy ..... 20
5. 15. Phone Input P.C.B. Assy . . 30
6. SchematicDiagams............. 31
6. 1. 10 Block Diagrams . . . 31
6. 2. Schematic Diagrams . . . . ...... . . . . . 34
6.2.1. Tuner and Power Supply Section . . . . 34
6.2.2. Amplifier Section . . . . ...... . . . . 37
'1. WiringDiamms..............,.......... 40
8. Block Diagrams ..... . ...... . . . 42
8. 1. Tuner Section . . . . . . . 42
8. 2. Amplifier Section . . . . 42
9. Specifications......... -» 43
1. GENERAL
1.1. Velma Selector
Voltage selector is imbued on the rear panel for Other version at the Nsklmichl Sit-2.
This voltage selector can select either 110 V, 120 V. 220 V or 240 V at customer's disposal.
51:25:? Pan. No. Description Qty 3151;?me Pm No. Description Qtv
FA03544A heme Auy (SR-2 (Camden 1 01 0390070A AM Loop Antenna Haida: 1
FonMGA Peck: Au'Y (SR-2 (Aulcnlinn 1 02 0390081A Feeder Antenna 1
FA03545A Pick! Any (8392 (Omen) 1 03 0890194A Antenna Adapter F (SR-2 & 1
FA08543A Pleklle Axy (SR-2A) 1 SR-ZA)
FA03568A Pack-ac Auy (SR-2E (Germany & 1 0390208A Antenna. Adapter EP (SR-2E) 1
Europe» 04 0390198A AM Loop Antenna 1
- 0D03092B Poly-Bat 320x340x°.03 1
01 0F03986A Carton Box (SR-2) 1 * 0D04449A Important Notice Card 1
0F03985A Carton Box (SR-2A) 1 0D046515 Owners Manual SR-4/3/2 1
0F039893 Carton Box (SR-2E) 1 h SR~4AI3AI2A
02 0F03984B Peaking L 1 0D04764B Owners Mlmnl SR-4E/3E/2E 1
03 0F08991A PIclan R 1 013046733 French Text (SR-4/3I2 (Canada)) 1
04 ' DF0367OA Poly-Sheet 1 - 013046743 Owners Manual Text (SR-4I3/2 1
- 0M03456A Volt-32 Seal 220V (SR-2 (01:11:20) 2 (Australia))
- 0M03457A Voltue Seal 240v (33-2 2 - 00046763 Owners Mnnual Text (SR-4I8/2 1
(Ann-nun» (omen)
- DA03873A Wan-Inty CM Ass'y (SR-2A) 1
DA03991A Accessory ASIY (SR-2 (Cumin) 1 - 0D04766A Catalogue (SR-2A) 1
DA03992A Account! Au! (SE-2 (Autfllln 1 - 0D04767A Wmmty Cud (SR-2 (Cinfld-l» 1
DAo4009A Accaum'v Auy (SR-2 «mug» 1
DA08990A Accounts! AuY (SR-2A) l
DAOSBQSA Adoauoxy Auy (SR-2E humps 1
DA04055A Awauoxy Auy (SR-2E 1
mummy»

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Signal to Noise Ratio at 65 dBf

Mono ................ Better than 72 dB

Stereo .............. Better than 67 dB
Mating Threshold .......... 30 dBf/17.3 [JV
Frequency Response ........ 20-15,000 Hz :tl dB
Total Harmonic Distortion (1 kHz)

Mono ................ Less than 0.20%

..... Less than 0.25%

Capture Ratio ............ 2.0 dB

Alternate Channel Selectivity . . 70 dB (£300 kHz)
Stereo Separation at 100 Hz . . . Better than 43 dB
at 1 kHz . . . . Better than 43 dB
at 10 kHz . . . Better than 27 dB
Spurious Response Rejection . . Better than 90 dB

Imsge Rejection ........... Better than 75 dB

IF Rejection ............. Better than 80 dB

AM Suppression ........... Better than 60 dB

[AM Sechon]

Note: Modulation: 400 Hz, 30%

Frequency Range .......... 522-1,611 kHz in 9 kHz steps

Sensitivity ............... 68 dBu/m

Signal to Noise Ratio at 90 . . . . Better than 52 dB

dBp/m

Total Harmonic Distortion . . . . Less than 0.3%

at 90 dBu/m

Selectivity ............... Better than 20 :13 (i9 kHz)

General

Power Source ............. 220 V AC, 50/60 Hz

Power Consumption . . . . . 190 watts max.

Dimensions .............. 430 (W) x 100 (H): 370 (D) mm
1615/16 (W) x 3-15/16 (H) x 14-9/16 (D) inches

Approximate Weight ........ 7.5 kg, 16 lbs. 9 oz.

0 Specifications and design are subject to change for further improvement without notice.
0 STASIS manufactured under license from Threshold Corporation.
0 STASIS is a trademark of Threshold Corporation.

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