NATIONAL |
NV370 |
50 Hz Everywhere, No Video Distorted E.E. |
2200 Ufd 25vw O/c In P/s. |
NATIONAL |
NV370 |
Accepts Tapes Then Ejects. |
Eject Load Belt Or Eject Switch's Vsm0048 |
NATIONAL |
NV370 |
All Function Lights Are On Irrespective Of Operation. |
Change Q6501,16501. |
NATIONAL |
NV370 |
Aud On Tuner Mutes When Afc Is Activated,closing Tune Door |
Check For Faulty C7105, 10µf 16v On Ch.Preset Pcb. |
NATIONAL |
NV370 |
Capstan Motor Oscilates Then Shuts Down. |
Replace R1101 In Power Supply. |
NATIONAL |
NV370 |
Capstan Motor Oslilates And Then Turns Off No Functions |
R1101 In Psu, R1105 O56 Fusable |
NATIONAL |
NV370 |
Capstan Motor Speed Varies |
C2025,c2026,c2027 4.7µf/25v |
NATIONAL |
NV370 |
Capstan Plays Fast |
Ic2002 Mn6168vif |
NATIONAL |
NV370 |
Chewing Tapes. |
Replace Idler Pulley. |
NATIONAL |
NV370 |
Chews Tapes. Motors No Go. |
Mode Switch |
NATIONAL |
NV370 |
Clock Display Ok. On/off Inoperative. |
Replace Resistor R1001 On Power Suppy Pcb. |
NATIONAL |
NV370 |
Counter Display Flashes B/t Dew And Normal Modes |
Ic 6501 Front Pcb.. |
NATIONAL |
NV370 |
Dew Sensor On , Drum Spins All Time |
Modify Dew Sensor With Earth Wire * |
NATIONAL |
NV370 |
Distorted Sound. |
Change Ic4001 (ta7355pp) * |
NATIONAL |
NV370 |
Distorted, Hum Bars In Pic. In Playback Or E.E. |
Replace Capacitor C1102 In Power Supply (uprating Voltage Rating Of Capacitor May Be A Good Idea). |
NATIONAL |
NV370 |
Drum Fails To Start. Low Torque |
Drum Windings Faulty. Buy New Vcr! * * |
NATIONAL |
NV370 |
Erratic Mechansim Behaviour |
Mode Switch Vss0091 |
NATIONAL |
NV370 |
Function Display All Lite Up |
Ic6501 Mn1250bvf2 |
NATIONAL |
NV370 |
Goes Dead Interm.,led "on" Tape Counter Indic.Fails For Sec |
Check 3.0v Zener Diode D1002 In The Regulator Circuit. |
NATIONAL |
NV370 |
Goes Into F.F. When Play Is Pressed.F.Rew. When Rec Is Selc |
Change C6011 O/c On The Syscon Board. |
NATIONAL |
NV370 |
Int Failure To Retract Tape When Unloading. |
Faulty Mode Select Switch Pt. No. Vss0110. |
NATIONAL |
NV370 |
Int Turning On And Off Completely. |
Mains Transformer Windings Int. Replacement: Etp57pso1a. |
NATIONAL |
NV370 |
Interm Capstan Goes In Rev. Or Counter Counts In Rev.In P/b |
Replace Mode Select Switch. |
NATIONAL |
NV370 |
Interm. Horiz. Twitching And Pulling On Playback. |
"sticking" Of The Impedance Roller Up-stream Of The Full Erase Head. The White Roller And Its Insert Should Be Replaced. |
NATIONAL |
NV370 |
Intermittent Recording. |
Change C3523 (near Base Of Q3501). |
NATIONAL |
NV370 |
Low Drum Torque. Interm. Drum Fails To Start Play. |
Change Ic2005 (an6387) * * |
NATIONAL |
NV370 |
Low Gain On Recieve. |
Replace Q3. |
NATIONAL |
NV370 |
Low Gain Tv Pic.,hum Bar When Test Signal Is Switched On. |
C1102 (2,200mfd) Leaky. |
NATIONAL |
NV370 |
Machine Goes Into Dew Alert Mode With No Dew Present. |
Check Earth On Dew Sensor Mount And Tighten Screw. |
NATIONAL |
NV370 |
Motor Fails To Start.Tape Tangles. |
Change Mode Switch. |
NATIONAL |
NV370 |
No Capstan Drive |
C2020 * * |
NATIONAL |
NV370 |
No Capstan Drive. |
Check An3822 Capstan Drive Ic Also .68ohm Resistor Not Shown On Cct It Feeds Pin 24 Of Ic, Occasionally It's A Wire Lik Marked R69. |
NATIONAL |
NV370 |
No Display |
R1002 1O5 Fuseable |
NATIONAL |
NV370 |
No Display And No Functions. |
Check R1001 O/c, Replace With .39 Ohms. Main Pcb Near The Rear Of Pcb (in Power Section). |
NATIONAL |
NV370 |
No Functions And No Display. |
Check The -30v Line Is Missing. Replace Q1102, 30v Zener (d1109), R1102. |
NATIONAL |
NV370 |
No Go, Power Light On (dim) Ch Light (dim) |
R1 O/c Bottom Board O/c. |
NATIONAL |
NV370 |
No Go. |
Mode Selector Switch. |
NATIONAL |
NV370 |
No Go. |
Thermal Link Bottom Board O/c. |
NATIONAL |
NV370 |
No Go. No Power. |
Cracked Cct Board (pcb Joins Bp201) 12v Zener S/c. * |
NATIONAL |
NV370 |
No Luminance. Flashing Colour In Display. |
Change Vefy005 Pack. |
NATIONAL |
NV370 |
No Picture In Playback |
D/j Q3562 Luminance Pcb. |
NATIONAL |
NV370 |
No Playback Colour. |
Check Ref. Freg. Is Way Off Replace P.C.B. Module. |
NATIONAL |
NV370 |
No Power. Power Light Comes On, Goes Off. |
Check Timer Rec Switch. |
NATIONAL |
NV370 |
No Record Or Playback. |
C1102 Faulty. |
NATIONAL |
NV370 |
No Rf Output In Tv Or Video Modes |
Check Q1101 For Dry Joints (no 12v To P702) |
NATIONAL |
NV370 |
No Tape Funct. Drum Const. Spinning "d" In Clock Display. |
Solder Wire From Earth Side Of Dew Sensor To A Convenient Earth Point On Machine (the Earth Shield On Tuner If Section Is A Really Good Spot). |
NATIONAL |
NV370 |
Noise Bar On Screen Every Six Seconds. |
Change C2006 100 Mfd O/c. * |
NATIONAL |
NV370 |
Noise Bars Every 6 Sec |
No Drum Sync C2006 100µf/6v |
NATIONAL |
NV370 |
Noisy Sound In Record Mode. |
Change Ic4001,ta7355p. |
NATIONAL |
NV370 |
Not Loading Tapes In Play |
Ic6003 Ba6209 |
NATIONAL |
NV370 |
Not Recording |
Qr6005 Dta124a Syscon |
NATIONAL |
NV370 |
Not Tunning Stations |
31v Rail Low Check C7103 .01µf |
NATIONAL |
NV370 |
Pb To Ee Picture Stays In Play |
Qr6006 Dta124a Syscon * * |
NATIONAL |
NV370 |
Picture In Playback And E-e Greatly Distorted. |
Change C1102 2200 Mfd 50v In Power Supply. * |
NATIONAL |
NV370 |
Poor Lumina, Chroma Flashes In Play |
Vefy 005 Pack |
NATIONAL |
NV370 |
Poor Luminance In Pb |
C3523 47µf/6v Luma Pcb |
NATIONAL |
NV370 |
Poor Pic, Large Drop Outs |
C3504 100µf/6v Near Ic3501 * |
NATIONAL |
NV370 |
Remote Functions Not All Working.Eg..Play Not Working. |
Remote Lead Has To Much Capacitance.Change Lead. |
NATIONAL |
NV370 |
Sometimes When Rew/f.F Is Selec. Machine Wont Function. |
Change Mode Switch (ve50246) And Idler Arm Unit (vxpo521). |
NATIONAL |
NV370 |
Tape Jams With No Other Functions. |
Check R1001 .12ohms For O/c. |
NATIONAL |
NV370 |
Tape Loads Up Runs Backwards...Chews Tape,counter Runs Back |
Check Pin 39 Of Ic6001 Is Above 1v If So, Change Ic6001 And Ic2002. |
NATIONAL |
NV370 |
The Take-up Spool Doesn't Rotate In Play Mode. |
Fit Modified Idler Assembly, Part No. Vxp0521. The Improved Idler Can Be Identified By The Blue Plastic Moulding Or Black Dot On The Left-hand Side Of The Idler Arm. |
NATIONAL |
NV370 |
Timer Resets To Zero,after Being Corrected,reset To Zero. |
Change Clock I.C. |
NATIONAL |
NV370 |
Video In Play And Ee Distorted Bad |
C1102 2200µf/50v Psu * |
NATIONAL |
NV370 |
White Pulses On Replay |
Check Screw In Lower Pcb Head Amp Section |
NATIONAL |
NV370 |
Will Not Inject Cassette. |
Check Switches On Cassette Carriage Vsm0046. * |
NATIONAL |
NV370 |
Wobbling Picture With Slight Interference On Sound. |
Check Tape Is Not Rubbing Against Washer At Bottom Of The Impedance Roller. |
NATIONAL |
NV370 |
Wow & Flutter. Motor Torque Low |
Ic 2004 An3822, Capstan Stator. Vek2129 |
NATIONAL |
NV450 |
Clock Ok But No Operate. |
F1102 O/c No 12v Unswitched Or 18v Unreg. |
NATIONAL |
NV450 |
Display Goes Weird, Flashes Weird Numbers, Or No Display.] rest Of Machine May Work. |
Replace Crystal On Top Tuner Adjust Board. x1 Near Ic 7501. |
NATIONAL |
NV450 |
Hum On Ee.Video In B/w |
Power Supply Caps C1104 And C1103 |
NATIONAL |
NV450 |
Loads Up, Plays For Few Secs. Stops And Unloads. |
Faulty Photo Interupter Under T/u Spool Should Switch At +5 Volts. |
NATIONAL |
NV450 |
No Display, No Operation. Reset Line Pulsing, No Switched 12.7v, Unreg 45v Noisy. |
C1102 100uf 63v Cap O/cct |
NATIONAL |
NV450 |
No Mechanical Reset At Vtr On |
Check Tf2001, Temperature Fuse, P.No. Eyp2br163g Mounted On Capstan Drive Ic,an3821k |
NATIONAL |
NV450 |
No Record Or Playback. |
Rf Converter Faulty. |
NATIONAL |
NV450 |
Picture Wanders Horiz. And Music Sounds Awful. |
Check Setting Of Servo Motor, Control Track Clean, Vibrating Exit Tape Guide, Or Mechanical Resonance In Audio Control Assembly. |
NATIONAL |
NV450 |
Plays B&w And Ee Noisy, Or Hum Bar Through Picture. |
C1002 O/c (100uf 35v) |
NATIONAL |
NV450 |
See Nv250 |
|
NATIONAL |
NV450 |
Slow Ff/rw, Fsearch Drops Into Ff, Rsearch Drops To Rewind |
Replace 1c2003 (mn6168vif) |
NATIONAL |
NV450 |
Stops Itermittently Or When Warm In Play Or Record. |
Check Tf2001, Temperature Fuse, P.No. Eyp2br163g Mounted On Capstan Drive Ic,an3821k |
NATIONAL |
NV450 |
Tape Plays /rec. For A While Then Stops. Counter Interm . |
Replace Reel Sensors. |
NATIONAL |
NV450 |
Vtr Switches Off By Itself Or Won't Switch Off Remote Fault |
Check Function Of Ic 7504, Mn14531vtv |
NATIONAL |
NV450 |
Won't Play, No Capstan Motor Fwd,capstan Reverse Ok |
Check Ic 2002,an3821k On Main Pcb. Pin 11 Should Be Low In Play, High In Rewind |
NATIONAL |
NV450 |
Wont Accept Tape. Wont Fully Eject Tape. |
Replace Worm Wheel On Eject Assy. |
NATIONAL |
NV470 |
Colour Drops Out, Hum Bar In Colour |
C1002 O/c ( 100uf,25v) |
NATIONAL |
NV470 |
No Vtr No Display |
Reg 12v Low. D1001-d1004 O/c |
NATIONAL |
NV470 |
Powers-up.Clock Ok.Accepts Tape But No Functions. |
Diln59 Diode Led For Sensors. |
NATIONAL |
NV470 |
Tv Pic Snowy With Vcr Operate Off |
12v On Pin8 Of P1101 R/s , D1108 13v Zenner |
NATIONAL |
NV600 |
Cannot Set Colock Or Program Modes |
Sw 7504 Esd14182 |
NATIONAL |
NV600 |
Capstan Fails To Start In Play Or Record Modes. |
Change O/c R2031, 100 Ohm. |
NATIONAL |
NV600 |
Capstan Speed Fast |
R2080 12k C2048 100µf |
NATIONAL |
NV600 |
Capstan Speed Faulty |
C2038 10µf/16v |
NATIONAL |
NV600 |
Capstan Speed Too Fast On Playback. |
Check Value Of R2080, 12k Ohms, Or D/j On C41. |
NATIONAL |
NV600 |
Chews Tapes In Record Pause Mode |
Pinch Roller Clearance,adjust Screw |
NATIONAL |
NV600 |
Drum Int Stops Or No Start |
C2023,c2024,c2025 .22µf/50 Tant |
NATIONAL |
NV600 |
Drum Motor Intermittently Fails To Start In Play Or Rec Mode Or Wont Start At All, Or Has Low Torque |
Suspect Ic 2001, Upc1405c,in Servo Circuit. |
NATIONAL |
NV600 |
Drum No Go |
Ic2002 An6677 |
NATIONAL |
NV600 |
Ejects After 8 Seconds And No Functions. |
Change D6025. Ma165. |
NATIONAL |
NV600 |
Fails To Start After Entering Play Or Record Mode. |
Check O/c R2059, 6.8ohm 1w. Or Change Ic2002 (an6677). |
NATIONAL |
NV600 |
Interm. Capstan Speed. |
Dry Solder Joins On Capstan Motor Drive Transistors Q18, Q6017 And Q6013 On Main Pcb Servo Section. |
NATIONAL |
NV600 |
Low Audio In Ee |
C759 10µf |
NATIONAL |
NV600 |
Luminance Or Playback Fades After 10 Sec. |
Change Ic3002, (an6337). |
NATIONAL |
NV600 |
No Chroma. |
D8004 Leaking.(ma165) |
NATIONAL |
NV600 |
No Clock Or Channel Select. |
Change Ic7504, Mn1228 Or Ic7505, An5033. |
NATIONAL |
NV600 |
No Rew. Or Ffd. |
Check D1506 And D1505. |
NATIONAL |
NV600 |
Not Selecting Stations. |
No 28v To Pin G Of Ic7504, Replace O/c R7547, 100k Ohms. |
NATIONAL |
NV600 |
Not Storing Stations |
Missing 28 V Ic7504 Check R7547 100k |
NATIONAL |
NV600 |
Not Tunning Stations |
R7543 180O |
NATIONAL |
NV600 |
Plays Slow Audio, No Picture. Audio Buzz In Ee No Picture. |
Q1003 Dry Joints |
NATIONAL |
NV600 |
Poor Colour In Playback. |
3300uf/16v Cap In Power Supply |
NATIONAL |
NV600 |
Poor Luminance In Pb |
Ic3002 An6337 |
NATIONAL |
NV600 |
Poor Picture From Self Record |
C2004 10µf/16v Or Heads |
NATIONAL |
NV600 |
Poor Picture In Play.Drum Speed |
C2024 .22µf/50v |
NATIONAL |
NV600 |
Poor Picture In Still And/or Cue Modes. |
Relay Ry3001 Dirty Contacts On Main Board Under Sheild On Main Board 9 Volt Dp Dt Mini Relay See Wes Cateldog |
NATIONAL |
NV600 |
Power Stays On 10 Seconds Then Power Off. |
Check Cassette Carriage Position Switches. |
NATIONAL |
NV600 |
Tangles Tapes In Search And Review Modes. |
Check R2096, 39 Ohms In Capstan Brake Circuit. |
NATIONAL |
NV600 |
Tapes Tangle In Cue Or Review |
R2096 39O Fusiable |
NATIONAL |
NV600 |
Tuning Faulty. |
Replace R7543, 180 Ohms. |
NATIONAL |
NV600 |
Vcr Stays On Few Sec Then Off |
Check Carriage Switchs |
NATIONAL |
NV600 |
Wont Rewind . Locks Up Take Upreel |
Replace Brake Pads On Brake Arms , The Spring Loaded One |
NATIONAL |
NV7000 |
Black Pic In Pause And V/search |
Q6709 False Vert Sync C/t |
NATIONAL |
NV7000 |
Clock Display Segments Wrong But Still Programs Correctly. |
Replace Three Driver Ic's All Icta57. |
NATIONAL |
NV7000 |
Clock Display Wrong. |
Replace Driver Ic's (3) Ta57 |
NATIONAL |
NV7000 |
Digits In Clock Go Out,days Go Brighter When Mode Is Selec. |
Check Ha1780 6v Regulator Ic501 And 12v Line If Ok Check For D/j's On Timer Panel, And Steady 262khz On Pin 40 Of Ic7505. |
NATIONAL |
NV7000 |
Int Speed Scearch |
Shaft On T/u Clutch Too Tight C&lub |
NATIONAL |
NV7000 |
No Capstan Lock |
C2040 47µf/16v |
NATIONAL |
NV7000 |
No Clock Display |
Q7501 2sc1683 , D7501 O/c |
NATIONAL |
NV7000 |
Noise On Screen Cannot Adjust Pg |
Ic2001 An6350 |
NATIONAL |
NV7000 |
Noisy Shuttle Search. |
Replace Or Readjust Mode Switch. |
NATIONAL |
NV7000 |
Pinch Solenoid Wont Pull In. |
Clean Capstan Shaft. |
NATIONAL |
NV7000 |
Poor Tv Reception Through Vcr And In Ee Mode. |
Replace All 3 Transistors In Rf Unit. |
NATIONAL |
NV7000 |
Snowy Picture. |
Rf Amp Earth Loose Tighten Screw At Top Of Can, Change Q3 In Amp. |
NATIONAL |
NV7000 |
Will Not Vtr On. |
No Sw. 12v At Pin 1p1003. Change Q1003, Use 2sc1847 and Zener Diode D1015 13v. |
NATIONAL |
NV7200 |
Drum Speed Faulty |
C2030,c2031,c2032 .22µf/50v |
NATIONAL |
NV7200 |
In Timer Mode Rec. Led Flashes, Tape Laces Up,runs Spasmod. |
Change Microcomputer I.C. |
NATIONAL |
NV7200 |
Int Failure To Record. |
Check If 9v On Pin 9 Of Ic3001 If So Check Q3003. |
NATIONAL |
NV7200 |
Int No Play. Usually After Lace Up Then Unloads. |
Check For Bad Contacts On The Cassette Detect Leaf Switch. |
NATIONAL |
NV7200 |
Int Operation Especially In Timer Mode. |
1: Mechanics Still, Sliding Bars Need Oiling (both Sides.) 2: Mechanic Sensor Switch Faulty Contacts. 3: Check Leading Belt. |
NATIONAL |
NV7200 |
Int Play Mode Table And Reel Jamming. |
Change Supply Reel Table Unit. |
NATIONAL |
NV7200 |
No Functions |
R1019 120O O/c |
NATIONAL |
NV7200 |
No Reel Drive |
Q6046 2sd973 |
NATIONAL |
NV7200 |
No Timer Programming. |
Check Clock Operation If Ok Check Program Switch For Bad Contacts. |
NATIONAL |
NV7200 |
Noisy Shuttle Search. |
Readjust Mode Switch Or Replace. |
NATIONAL |
NV7200 |
Pinch Solenoid Wont Pull In. |
Clean Capstan Shaft. |
NATIONAL |
NV7200 |
When Play Pushed,clock Loses Time And Display Goes Haywire. |
C1005 On 13v Rail. |
NATIONAL |
NV7200 |
Wow In Sound. Both Record And Play Modes. |
Check Tp2009 For Phase Lock Drift If Present Check Capstan Motor For Tight Bearings, Also Back Tension, If Ok Change Capstan Motor. |
NATIONAL |
NV730 |
Changes B/t Lp To Sp On Lp Tapes |
Clean Control Head |
NATIONAL |
NV730 |
Chews Tapes |
P5 Arm Unit Seized Vxl1223 |
NATIONAL |
NV730 |
Chews Tapes Int |
Dj On Power Transistor Q1504 On Heatsink Rhs Rear. |
NATIONAL |
NV730 |
Display Faulty |
X7504 Vsx0138 |
NATIONAL |
NV730 |
Faulty Inject Or Eject. Vtr Turns Off. |
Replace Gear On Cassette Carriage P. No. Vxp0604. |
NATIONAL |
NV730 |
Flag Waving |
Check Exit Guide Vxp0444 |
NATIONAL |
NV730 |
No Backup Memory |
Check "gold Caps" |
NATIONAL |
NV730 |
No Capstan Drive |
Ic2004 An3822, Or Capstan Mtr Vek2208 |
NATIONAL |
NV730 |
No Capstan Drive In Play Or Record Modes. |
Check R2094 And R2054. If Ok Replace Ic2004, An3822k With An3821k. |
NATIONAL |
NV730 |
No Drum Int |
C2018 3.3µf |
NATIONAL |
NV730 |
No Drum Spin |
Ic2003 An6387 |
NATIONAL |
NV730 |
No Go |
Ic 6004 Ba6209 Load Mtr Ct. |
NATIONAL |
NV730 |
No Go Clock Ok |
Ic6001 Mn15342vgd, X6001 Vsx0082, Ic7504 Mn1228 |
NATIONAL |
NV730 |
No Go F1003 O/c |
Ic 1501 Stk5361l R1505 68 O Fusiable |
NATIONAL |
NV730 |
No Go Missing 30 And 45 V Rails |
R1002 4O7 |
NATIONAL |
NV730 |
No Go No Clock Display |
R1002 4O7 |
NATIONAL |
NV730 |
No Go No Clock Display |
Ic7503 Mn1512vtj |
NATIONAL |
NV730 |
No Or Intermittent Reel Motor Drive.Eject, Tape Caught Cyl. |
Check For D/j On Power Transistors, Q1504, Mounted On Heatsink. |
NATIONAL |
NV730 |
No Reel Motor Function. |
Resolder Q1504 And Bp1504. |
NATIONAL |
NV730 |
Not Eject Tapes Or Accept |
Worm Drive Vxp0575 |
NATIONAL |
NV730 |
Pic Flutters |
Entry Guide Vxp0444 |
NATIONAL |
NV730 |
Tapes Crease In Cue Review |
Wear In Capstan Bearing |
NATIONAL |
NV730 |
Turns Off When Ejecting |
Carriage Switchs Vsm0050 |
NATIONAL |
NV730 |
Vcr Turns On Then Off 4 Sec |
Carrige Switches. Vsm0050 |
NATIONAL |
NV730 |
Vtr On, Rewinds For 4 Sec. Then Turns Off. |
Check Position Of Cassette Carriage Position Switches. |
NATIONAL |
NV730 |
When Play Mode Selec. After 1 Hr. Unlaces And Turns Off. |
Change Ic2004 See Fault In This Model. |
NATIONAL |
NV730 |
Wont Memorize Stations |
Ic7504 Mn1228 |
NATIONAL |
NV730 |
Wont Play. Not Lacing Up |
Mode Switch Ves0091 |
NATIONAL |
NV730 |
Wont Switch On Not Accepting Tapes |
Ic6005 Ba6209 |
NATIONAL |
NV777 |
Accepts Command With No Tape In Unit. Rew Command Ok. |
Check Main Cam Plastic Cog For Missing Teeth. (set Mode Switch For Stop Not Eject). |
NATIONAL |
NV777 |
Capstan Fast |
Ic2008 Or C2047-2049 |
NATIONAL |
NV777 |
Capstan Runs On From Cue Chews Tapes Int? |
C2047,c2048,c2049 .47µf/50v Rl6409 * |
NATIONAL |
NV777 |
Chews Tapes |
P5 Arm Seized Vxl1047 |
NATIONAL |
NV777 |
Drifts Off Tune |
Mn1228 |
NATIONAL |
NV777 |
Drum Motor Fails To Start. Low Drum Torque. |
Replace C2059, C2060 And C2061, 0.22µf 50v. Also 2.2 µ Caps On Same Ic |
NATIONAL |
NV777 |
In Play,cue Mode When F.Fwd Button Released Play Wrong Speed |
Replace C2047, C2048 And C20249, 0.33µf 50v. |
NATIONAL |
NV777 |
Int Chroma Lines In Pb |
Dj On Ic3001 Thickfilm |
NATIONAL |
NV777 |
Int Power To Vtr |
Power Transformer Int |
NATIONAL |
NV777 |
Jitter In Pause Mode. |
Rubber Plug On R.H.S Of Machine Gives Access To Present Adj. |
NATIONAL |
NV777 |
Lack Of Line Lock. |
Check Whether The Drum Pg Pulse Is Present At Tp2006. If Not, Replace The Drum. If The Pg Pulse Is Present, Check Switching Pulse Is Present At Tp2011. If Not,suspect Ic2003 (an6346n). If Switching Pulse Is Ok Check The Squarewave Output At Pin 27 Of Ic2 |
NATIONAL |
NV777 |
Looks Like Faulty Heads, One Head Only At Rf Test Point. |
C3034 Leaky (10uf/25v) |
NATIONAL |
NV777 |
No Capstan Drive |
C2021 10 µf/16v |
NATIONAL |
NV777 |
No Clock Or Screen Functions. |
R7560 Thermal Resistor On 40 V Rail. Located On Timer/operation Pcb |
NATIONAL |
NV777 |
No Functions Wont Switch On. |
Replace Reset Capacitor On Ic6001. |
NATIONAL |
NV777 |
No Go But Clock Ok |
Mode Switch Vss0060 |
NATIONAL |
NV777 |
No Playback Or E.E. Sound Lcd Counter Display. |
Check Q6062 (2sc1847) On Syscon Board O/c Bd137 Ok. |
NATIONAL |
NV777 |
No Reel Motor Drive |
Q6016,q6017 Or Ic6007 Sta131a |
NATIONAL |
NV777 |
Slow Or Fast Capstan When Hot? |
Ic2001 Mn6168via |
NATIONAL |
NV777 |
Slow Or Fast On Playback. Often Only When Hot. |
Replace Ic2001, Mn6168. |
NATIONAL |
NV777 |
Tape Plays /rec. For A While Then Stops. Counter Interm . |
Replace Reel Sensors. |
NATIONAL |
NV777 |
Tv Jitter In Pause. |
Adjust Jitter Pot. |
NATIONAL |
NV777 |
Vtr And Clock On,wont Inject Tapes, No Mech. Functions. |
Check Position Of Mode Switch. P. No. Vss0060. |
NATIONAL |
NV777 |
Wont Tune Channels. |
R7019 O/c On Tuner Board. |
NATIONAL |
NV778 |
See Nv777 |
|
NATIONAL |
NV788 |
See National Nv777 |
|
NATIONAL |
NV830 |
No Capstan Motor Drive In Playback, Rew Or F.Fwd. |
No 12v On Pin 24, Ic4. Repair Fusible Link W313. |
NATIONAL |
NV830 |
No Colour. |
Check 12v Rail, Also Q1003 And D1004 For Leakage. |
NATIONAL |
NV830 |
No Tuner Picture. |
Check Transistors Q7006 And Q7007. |
NATIONAL |
NV830 |
One Audio Channel Low. |
Replace Q4315, 2sd655. |
NATIONAL |
NV830 |
Overloading On E-e. |
Change Bn5115b I.F. Chip. |
NATIONAL |
NV830 |
See Nv370 |
|
NATIONAL |
NV830 |
Will Not Tune Stations. |
Check/replace Ic7503. |
NATIONAL |
NV850 |
All Displays Light Up For Approx,8secs Then Vtr Off. |
Suspect Load Motor And Ic Driver Ic 6003, Ba6209 In The System Control Section Of The Main Pcb |
NATIONAL |
NV850 |
At Vtr On Or Power On,capstan Motor Rotates No Mech Reset |
Suspect Load Motor And Ic Driver Ic 6003, Ba6209 In The System Control Section Of The Main Pcb |
NATIONAL |
NV850 |
Blank Screen In E-e Tuner Mode,audio,ok. Cassette Play Ok. |
Check For Faulty Tr703, 2sd636, In Demodulator Unit |
NATIONAL |
NV850 |
Int Capstan Stops Or Vaires |
Pressure Roller Seizing |
NATIONAL |
NV850 |
Int Drum Stops In Pb/rec |
Ic2005 An6387 |
NATIONAL |
NV850 |
No Go |
R1001 O34 Fuse Or C1101 3300µf/16v Or Ic6003 Ba6209 Loadmtr |
NATIONAL |
NV850 |
No Picture In Ee |
Q702 2sa564 |
NATIONAL |
NV850 |
No Test Sig |
X3001 Vsx0099 |
NATIONAL |
NV850 |
Red Vtr Indicator On All Times Clock On But Can't Be Set |
Check For Open Circuit R1001 In The Power Section Of The Main Pcb. |
NATIONAL |
NV850 |
See Nv370 |
|
NATIONAL |
NV850 |
Sound On Hifi Ok? Normal Varies |
Ic2004 An3822- Use An3821 As Replacement |
NATIONAL |
NV850 |
Unable To Tune Stations |
Check Ic7505 If Unable To Change Tuning Of Station, Else Replace Ic7503. |
NATIONAL |
NV8600 |
Flashing On Screen With Varying Brightness In E.E. And Rec. |
Check The Record/playback Switches If Ok Look For D/j's In The R.F/i.F. Stages (monitor Tp301 On Luminance Panel.) |
NATIONAL |
NV8600 |
Goes Abnormally Fast In Play. |
Check 2sa699 S/c Also Capstan Motor Should Draw (30 Ma Off Load 80-120 Ma On Load). Any More Than This Means Capsatn Motor Faulty. |
NATIONAL |
NV8600 |
Playback Of Pre-recorded Tapes Ok Not Rec Luminance |
Check For Faulty Q301,2sc828 On Luminance Process Pcb |
NATIONAL |
NV8600 |
See Nv2000 |
|
NATIONAL |
NV8600 |
Wont Play Or Record. Pinch Roller Wont Engage. |
Check Solenoid Pull In Transistor For O/c Replace With Bd 139, Also Check Damping Diode D624. |
NATIONAL |
NV8610 |
Drum And Capstan Motors Running As Soon As Power Is On. |
Check Or Replace Loading And/or Load End Switch. (mounted On Sub Board Vjb00310 On The Deck.) |
NATIONAL |
NV8610 |
See Nv2000 |
|
NATIONAL |
NV870 |
Faulty Loading Motor Drive. |
Replace Ic6004, Ba6238. |
NATIONAL |
NV870 |
Faulty Loading Motor Operation |
Ic6004 Ba6238 |
NATIONAL |
NV870 |
No 12v B+ On Tuner. |
Replace L2002, 1 Mh. |
NATIONAL |
NV870 |
No 14v To M. Comm. Motor. |
Check F2001, Vsf0035. |
NATIONAL |
NV870 |
No Go, No Display Or Jumbled |
Ic7501 Mn1455bvl |
NATIONAL |
NV870 |
No Tuning Memory With Dim Display. |
Check - 28v To Memory Chip Via R7550 (27ohm). |
NATIONAL |
NV870 |
Not Recording Audio On One Channel |
Replace C4594 And C4565, Both 47µf 6v Capacitors. |
NATIONAL |
NV870 |
Vtr Turns Off 10 Sec, Wont Accept Tapes |
Dj On Q1503 (h/sink Rear Corner) |