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 |