| NATIONAL | MV300 | No Traking Control In Playback. | Q6003 O/c Replace Bc339 |
| NATIONAL | MV300 | Not Recording Video Or Audio | Check Non Record Supply. C3020 220µ F 6.3v S/c Q3020. |
| NATIONAL | N788 | All Functions Work Except Eject. | Replace Ic 6001 Mn15342vgd |
| NATIONAL | NV100 | All Functions Stop After Several Seconds. | As Above, Only Check Photo Sensors Under Take-up Reel. |
| NATIONAL | NV100 | Capstan Servo Slow/oscillating | Dry Joint Plated Thru Hole Joining R2024 To R2042/c2020 |
| NATIONAL | NV100 | Capstan Speed Varies. | C2017 (10uf), Q2003 Servo C/t |
| NATIONAL | NV100 | Drum Int Fast (when Cold?) | C2029 47uf Near Ic2003 |
| NATIONAL | NV100 | F.F. And Rew. Stop After Several Seconds, Play, Rec. Ok. | Check Function Of Photo Sensor Under Supply Reel Table. P.No. On2160. Possibly Only Cleaning Of Both Sensor And Underside Of Reel Is Required. |
| NATIONAL | NV100 | Int Stops All Functions | Reel Sensors Prt# On2160, Clean First. |
| NATIONAL | NV100 | Interm. Capstan Speed Varies. Possibly When Cold. | Replace Suspect C2017, 10µf 16v, Off Pin 3 Of Ic 2005. |
| NATIONAL | NV100 | Interm. Drum Speed Is Very Fast. Possibly Only When Cold. | Replace Suspect C2029, 47µf 6v, Near Ic2003. |
| NATIONAL | NV100 | Intermittent Stopping | Check Microcomputer Port Expansion Chip 16003. |
| NATIONAL | NV100 | No Colour Rec/play | C8009 |
| NATIONAL | NV100 | No Pic Or Audio In Ee | Q733 |
| NATIONAL | NV100 | No Playback Colour For First Few Seconds. | (depends On How Long Machine Has Been Switched Off After Overnight Rest 3 Mins.) Replace C8009 Near Ic8001. |
| NATIONAL | NV100 | No Power No Go | F6501 T2a |
| NATIONAL | NV100 | No Sound At Turn On, Then Sound Appears Slowly. | C4008 In Sound Section Leaky. 22uf 10v |
| NATIONAL | NV100 | No Video (int) In Playback | D/j On Ic3001 |
| NATIONAL | NV100 | Not Erasing Previous Video/audio | Q1012 2sb643 Ic1002 Vcr0044 |
| NATIONAL | NV100 | Not Recording Colour | Ic8002 |
| NATIONAL | NV100 | On Tuner No Display | C6763 10uf Reset Pcb |
| NATIONAL | NV100 | Playback Audio | Check Voltage At Pin 1 Of Ic4001 If Low (2vo Instead Of (4.3v) Replace C4016. |
| NATIONAL | NV100 | Takeup Idler Not Turning In Play. Ff & Rw Ok | Remove And Clean Play Idler Gear Assy (transmit Arm Unit. |
| NATIONAL | NV100 | Turns Off After 10 Sec. Stop Led Flashes On Eject | R6402 O/c May Need Ic6401 & Load Mtr |
| NATIONAL | NV100 | Turns Off After Several Seconds, No Reset Mechanical | R6421 1k Ic6401 If 12v Ok On Pins 2,3 Ic6401 |
| NATIONAL | NV100 | Unit Wont Go Into Full Load Pos. After R6401 Has Failed. | Replace Only With .47 Fusable Resistor. Loading Mechcon. |
| NATIONAL | NV100 | Vtr Turns Off After Several Sec. No Mech. Reset At Vtr On. | Check R6421, 1k Ohm. Suspect Ic6401, Vcr0045, If Supply 12v O.K. At Pins 2 And 3 Of Ic 6401 And No Output To Motor On Pins 8 And 12. |
| NATIONAL | NV100 | Wont Pause. | Is The Front Panel Pluged In. Ie Slow Tracking Controll |
| NATIONAL | NV180 | Picture Faulty Due To Constantly Changing Cylinder Speed. | Check For Dry Joint On Capacitor C46, Mounted On Trackside Of Main Pcb Under Ic2, Near Drum Motor Connector. |
| NATIONAL | NV180 | Snowy Pic. Looks Like One Dirty Video Head. | Check For Faulty Or Dry Joint C2531, 0.1µf, Off Pin 22 Of Ic 5 On Main Pcb. |
| NATIONAL | NV180 | Wont Go Battery Charge Mode When Conn. To Vw-a18 Charger. | Check For Open Circuit Track On Main Pcb Between: Pin 2 Of P215, Rear Right=hand Corner; And Anode Of D6501, Front Right Ahnd Corner. Track On Component Side Of Pcb Too Thin To Carry, Use Wire Link To Join These Two Points. |
| NATIONAL | NV180 | Wont Rewind. F.F. For Only A Few Sec. | Replace Reel Stator Base Unit Vxa2045. |
| NATIONAL | NV2000 | Capstan Motor Fails To Start After Lace Up. | Check .5v On T.P. 2008 In Playback. Replace Q2015 - use 2sc1826. |
| NATIONAL | NV2000 | Clock Failure With No Display | Check 100 Ihm Safety Resistor (r7632 In Nv 366), Check Back Up Battery Is Not Leaking. |
| NATIONAL | NV2000 | Clock Wrong Resets. | Ic7501 (mn1435vx). |
| NATIONAL | NV2000 | Display Slow In Coming On, Disappears When Switched On. | Replace C1009 (1000 Mfd). |
| NATIONAL | NV2000 | Distorted Pic In Pb,no Test Sig,no Clock | C1009 Replace |
| NATIONAL | NV2000 | F/f When Rewind Selected. Plays Fast | 9v Reg U/s, Q6012, Q6013 Syscon |
| NATIONAL | NV2000 | Good Picture On Playback Poor On Record. | Suspect Video Head. |
| NATIONAL | NV2000 | Head Speed Varies, Switches To Standby After Warm Up. | H.S.W.P. Disappears, All Other Waveforms On Ic701 Correct, R772 Was 47 Ohm, Change To 470 Ohms. |
| NATIONAL | NV2000 | Int Colour Recording When Hot. | Loss Of Afc Sync (afc Osc Tp505 Not Synced With Video Signal Tp509). Replace Ic503 And Adjust Afc. |
| NATIONAL | NV2000 | Int Jams Up. | Replace Mode Switch Or Load Belt. |
| NATIONAL | NV2000 | Int Tracking Head Speed Too High. | Very Low Fg Signal, Fg Coil Int Contact, Replace Lower Head Drum Assembly. |
| NATIONAL | NV2000 | Load Motor Wont Return Mode Switch To Correct Position. | Replaced D6010. |
| NATIONAL | NV2000 | No Audio Record. | No Supply To Bias Osc. (q617 S/c) |
| NATIONAL | NV2000 | No Clock - No Functions. | Q1007 In P/s. |
| NATIONAL | NV2000 | No Picture Recording. | O/s F1201. |
| NATIONAL | NV2000 | No Play/ff/rew. | Q6004 O/c. |
| NATIONAL | NV2000 | No Playback, No Sound. | Replace Ic801 If Pin 35 Permanently High. |
| NATIONAL | NV2000 | Not Tracking, Head Speed Too Fast. | Ic704 Faulty (s/c) |
| NATIONAL | NV2000 | Picture Off Tape Unstable. | Back Tension Band Pad Faulty. |
| NATIONAL | NV2000 | Pinch Solonoid Wont Pull In. | Readjust Mode Switch. |
| NATIONAL | NV2000 | Play Mode Then Stops. Capstan Wont Operate In Play/rec. | Replace Both Loading Belts. |
| NATIONAL | NV2000 | Poor Tv Reception Through Vcr And In Ee Mode. | Replace All 3 Transistors In Rf Unit. |
| NATIONAL | NV2000 | Servo Slow To Lock In,colour,sound Variation When On. | Drum Or Capstan Lock Out Of Adjustment. |
| NATIONAL | NV2000 | Slow Capstan Speed Poor Tracking. | Replace C1009 In Power Supply. |
| NATIONAL | NV2000 | Slow Capstan, Hum On Video. | C1009 1000 Mfd 35v Faulty. |
| NATIONAL | NV2000 | Snowy Picture. | Rf Amp Earth Loose (top Of Can) Tighten Screw. |
| NATIONAL | NV2000 | Stops For No Reason After A Long Period Of Time. | Int Reel Motor - Try Clean And Lube Otherwise Replace. |
| NATIONAL | NV2000 | Tape Gets Stuck In Housing. | Replaced D6010. |
| NATIONAL | NV2000 | Tape Jammed In Unit. | Bad Crimp Connection On Plug. |
| NATIONAL | NV2000 | Tape Jams In Houseing, Mode Selec. Switch Wont Go Neut.Pos. | Replace D6010. |
| NATIONAL | NV2000 | Tape Not Rewinding Into Cassette. | Reel Idler Slipping (clean) |
| NATIONAL | NV2000 | The Timer Will Not Program. | Change Clock I.C. |
| NATIONAL | NV2000 | Timer, Demod,capstan Motor 18v Low When Vtr Switched On. | Collector Of Q1007 Drops In Value. Change C1009 And/or leaky D1011. |
| NATIONAL | NV2000 | Tracking - Noise Bars. | Loading Arm (b) Not In Location - Double Acting Spring Loose, Reinsert Spring. |
| NATIONAL | NV2000 | Vtr Indication On At All Times. | Short In 6v Line. F1003 O/c Ic1501 In Power Supply Faulty. Zener Diode 6.8v. D7542 On Timer Pcb, Short Or Leaky. |
| NATIONAL | NV2000 | Wont Tune Sound, Pic. Together. No Sound On Prerecor. Tape. | Change C4019 (o.33mfd) O/c. |
| NATIONAL | NV250 | After Goes Into Play Mode Stays Laced Up But Stops. | Replace Mode Select Switch. (to Be Done In Eject Mode And Align V Notch). |
| NATIONAL | NV250 | At Power On Capstan Rotates For Approx 6 Sec.,turns Off. | Change Ic6003 (ba6238) |
| NATIONAL | NV250 | Capstan Wont Start When Laced Up For Play Or Record. | Faulty Mode Switch. |
| NATIONAL | NV250 | Capstan Wont Start. Turns Off | Mode Switch Vss0110 |
| NATIONAL | NV250 | Clock Erratic Wont Flash | Q6001 2sb636 |
| NATIONAL | NV250 | Display Fully Lite | Ic6501 Mn15823vtt |
| NATIONAL | NV250 | Drum Stops And Vcr Turns Off. | Faulty Mode Switch. |
| NATIONAL | NV250 | E-e Tuner Mode Ok, On Playback Blank Screen Audio Burst | Change Ic6003 (mn15342 Vg1 Or Vgp) |
| NATIONAL | NV250 | Eject Button Pressed In Play, Ejects Without Going Into. | Replace Mode Select Switch. (to Be Done In Eject Mode And Align V Notch). |
| NATIONAL | NV250 | Erratic Mechanical Behaviour | Mode Switch Vss0110 |
| NATIONAL | NV250 | Loads Then Unloads, Slow Rewind | Mode Switch Vss0110 |
| NATIONAL | NV250 | No Channel Display Or Select. | Change Ic7501 (mn14824vtu). |
| NATIONAL | NV250 | No Colour In Playback | Q8001 2sd636 Or Ic801 |
| NATIONAL | NV250 | No Colour On Playback. | Change Q8001 (2sd636) Or Chroma Pack Vefc009. |
| NATIONAL | NV250 | No Display | If Pin 9 Of Ic2005 Lower Than 2.8v Adjust Reset Vr7502. |
| NATIONAL | NV250 | No Display | Check Adjustment Of Reset Vr7502 |
| NATIONAL | NV250 | No Display | R1103,q1101,d1105 |
| NATIONAL | NV250 | No Flashing Display | Change Q6001 (2sd636) |
| NATIONAL | NV250 | No Functions, On Clock. | Check R1103 O/c, Q1101 (2sa684) And D1105 (30v Zener). if 30 Volt Line Still Low Check Q7503 (2sd637r) |
| NATIONAL | NV250 | No Go No Display | Check R1103 O/c ,ic 6501 Mn14824vtu |
| NATIONAL | NV250 | Not Dectecting End Of Tape | Led Sensor D1501 Vjb00c48 |
| NATIONAL | NV250 | Picture Rolls, Loss Of Control Signal. Capstan Servo Roll. | Replace Faulty Capacitor, C2031 47uf 10v near Ic 2005 An6356n |
| NATIONAL | NV250 | Play And Record Stops Intermittently. | Change Ic2005 (an6356n), Suspect Photo Interrupter (on2106) |
| NATIONAL | NV250 | Poor Lum In Ee & Colour Int | Ic301 Lumance Pack Vefy007 |
| NATIONAL | NV250 | Poor Remote Distance | D/j On C6504 |
| NATIONAL | NV250 | Power Up Capstan Rotates Then Turns Off | Ic6003 Ba6238 Also Check Worm Wheel On Eject Asy. |
| NATIONAL | NV250 | Preset Stations Go Blank When Selecting But Retain Mem | Ic7503 Mn1228 |
| NATIONAL | NV250 | Preset Stations Inter. Go Blank Raster. Still In Memory. . | Replace Ic7503 (mn1228) |
| NATIONAL | NV250 | Remote Control Not Operating Over 1.5 Metres From Vcr. | C6504 On Display Pcb Possible Dry Joints. |
| NATIONAL | NV250 | Stops In Pause Mode. | Faulty Mode Switch. |
| NATIONAL | NV250 | Stops In Play And Record Int | Ic 2005 An6356 , Photo Interrupter On2106 |
| NATIONAL | NV250 | Switchs To Bypass Mode When Hot | 5v Line Low Q1003,q1004, Adjust Vr1001 |
| NATIONAL | NV250 | Unlaces And Slow Rewinds When Review Pressed. | Faulty Mode Switch. |
| NATIONAL | NV250 | Vcr Not Switching Off. | Change Ic7504 (mn145532vtw) |
| NATIONAL | NV250 | Vtr/tv Sw Int Operation | D/j Pin 18 Ic 7502 |
| NATIONAL | NV250 | Wont Accept Tape. Wont Fully Eject Tape. | Replace Worm Wheel On Eject Assy. |
| NATIONAL | NV250 | Wont Rec/play Int | 5v Supply Low (tp1001) Adjust Vr1001 Or Q1003,q1004 |
| NATIONAL | NV280 | After Goes Into Play Mode Stays Laced Up But Stops. | Replace Mode Select Switch. (to Be Done In Eject Mode And Align V Notch). |
| NATIONAL | NV280 | Does Not Memorize Stations. | Replace Ic7503 (an1228). |
| NATIONAL | NV280 | Drum &/or Capstan Varies Speed Or Fast | Ic2003 Mn6168vif |
| NATIONAL | NV280 | Eject Button Pressed In Play, Ejects Without Going Into. | Replace Mode Select Switch. (to Be Done In Eject Mode And Align V Notch). |
| NATIONAL | NV280 | Low Capstan Motor Torque. | Check Value Of R2029 (56k) |
| NATIONAL | NV280 | No Clock Or Channel Display | Ic7502 An5033 |
| NATIONAL | NV280 | No Clock Or Channel Display. | Change Ic7502 (an5033) |
| NATIONAL | NV280 | No Clock. | Q1101 Shorted & Zener Diode D1105 (30v) S/c. |
| NATIONAL | NV280 | No Go | C1116 1000uf/10v |
| NATIONAL | NV280 | No Or Low Capstan Speed | R2018 .82 Fuseable (must Be Replaced) |
| NATIONAL | NV280 | No Power | R1103 O/c. Power Supply. |
| NATIONAL | NV280 | Not Sensing End Of Tape.Not Going Into Auto/rewind. | Q6006(2sd636) And And R6048,connecting Photo Sensor To Processor. |
| NATIONAL | NV280 | Sometimes Catches Tapes.Capstan Motor Starts To Jerk And Stall Until Unit Shuts Off And Leaves Tape Out Of Cassette. | Mn6168vif Ic On Main Board Under Tuning Section. |
| NATIONAL | NV280 | Supply Rails High | Replace C1110 C1111 |
| NATIONAL | NV280 | When Pause Selected In Playback, Tape Speed Increases. | Change Ic2003 (mn6168vif) |
| NATIONAL | NV280 | Wont Acceppt Tapes | Ic2 An3821 Tf1 Thermnal Fuse |
| NATIONAL | NV280 | Wont Remember Stations | Ic7503 Mn1228 |