Sanyo MR-939 Service Manual

SAN YO(9Stereo Tape RecordermoveEL MR-939SERVICE MANUAL- SANYO ELECTRIC CO., LTD.INTERNATIONAL DIVISION: SANYO ELECTRIC TRADING CO., LTD.OSAKA, JAPANSPECIFICATIONSSpeed Accuracy -++-eee+e+ +3% Standard (7-1/2, 3-3/4 or 1-7/8 ips) Gain Balance, CH-CH --:--- 2dB max. difference (overall record/speed Variation +--+ 2% Max. (Start to end of reel) play)A) Cee 0.15% Max. 7-1/2 ips (WRMS Value) Frequency Responce0.20% Max. 3-3/4 ips (WRMS Value) Record-Play:--| SPEED FREQUENCY c/s0.30% Max. 1-7/8 ips (WRMS Value) 100. 100030005000 10000Rewind/Fast Forward ------ Up to 2min. for 1200 ft. on 7 in. reel aiaace “1/23 He +3Sensitibity 7-1/2 ips = Ee _7Microphone Input-.-—67 to —73 dBm for standard Rec. 3-3/4 ips +6) 0level on meter 4AUX Input... —17 to —23dBm for standard Rec. 1-7/8 ips = 0 a alevel on meter SSSPower Output (10% Dist.)---3 Watts each channel Reel Torque (gr-cm) «----+-+- MODE | LEFT | RIGHTCross-Talk,Channel to Channel-.-Better than 60 dB PLAY | 30 - 60 | 100- 150Bias Frequency Seas euceuresee 80 Ke ;Erase Efficiency ++:-1:+--++--- At least 60 dB REW. |450-550 | 40-60Signal Noise Ratio------.-+-+: Better than 38dB without Weighting F. FOW. | 30-60 | 500-700NetworkHum and Noise --+-------+++ 30 mV Max. Volume and Tone Max. Pinch Roller Pressure ------ 900-1300 grDISASSEMBLY.~ To Disassemble:‘ Step 1. Pull off control knobs.Step 2. Remove nuts of the headphone and microphone jacks.Step 3. Remove tape speed selector knob.Step 4. Remove set-screws and pull off control lever.Step 5. Remove head-housing.Step 6. Remove screws (five) fixing front panel, and removepanel.Step 7. Remove screws (two) fixing chassis to top of cabinet.Step 8. Remove screws (four) fixing chassis to rear of cabinet.Remove chassis carefully.‘ ’ To Reassemble:Reverse disassembly sequence.For sub-disassembly and sub-reassembly refer to illustrations inreplaceable parts list.