| NATIONAL | NV300 | Any Function Lights Up Power On Intermittently Changes Mode | Pin 8 Of Ic6005 Changes Amplitude, Normally 2.62v If Low Replace Ic6005 (upd4069ubc) |
| NATIONAL | NV300 | Blank Raster On Tuner. | Check C7009 (.01mfd). |
| NATIONAL | NV300 | Buzzing In Sound With Low Sound On Recorded Programs. | Check 17v Rail If High (18.45) Look For D/j On D1013. |
| NATIONAL | NV300 | Capstan Motor Speed Fast | Fault In Fg On C.Mtr |
| NATIONAL | NV300 | Capstan Motor Wont Start When Loading Is Complete. | If Pin 6 Of Ic6001 Stays Low Check Mode Switch. |
| NATIONAL | NV300 | Capstan Not Locking. | Bottom Board Plug Off. |
| NATIONAL | NV300 | Capstan Slow Or No Go | C2049 10/16v |
| NATIONAL | NV300 | Capstan Speed Faulty In Record Mode Play Mode Is Ok | Check Faulty C2034,0.1µf 100v |
| NATIONAL | NV300 | Capstan Wont Lock. | C2026 .22uf Cap |
| NATIONAL | NV300 | Clock Display Very Dim | D7511 Leaking |
| NATIONAL | NV300 | Distorted Sound On Playback. | Change Q4014. |
| NATIONAL | NV300 | Door Stays Up (ejects) | Lever Broken. Q6025 To Q6030 Or Ic6005 |
| NATIONAL | NV300 | Drum Hunts. Poor Pic Like Heads | C2003 10/16v |
| NATIONAL | NV300 | Drum Speed Int | C2022,c2023,c2026 2.2uf/50v |
| NATIONAL | NV300 | Drum Wont Go. Play Mode Wont Load. | Check Q6002 (qsb641) |
| NATIONAL | NV300 | Function Buttons Not Operational Except Eject. | O/c Remote Jack. |
| NATIONAL | NV300 | Goes In To Ff When Lid Closed | Plug From Reel Sensor Off. Lhs Rear 2pin |
| NATIONAL | NV300 | Goes Into F.F. When Door Closed With No Tape In. | Bottom Board Plug Has Come Off. |
| NATIONAL | NV300 | Hum In Video And Audio In Playback, Sound Wows, Hum In Ee | C1002 (2200 Uf) O/c |
| NATIONAL | NV300 | Hum In Video/ee.Capstan Wont Lock. | C1002 2200uf Cap And C2026 .22uf Cap |
| NATIONAL | NV300 | Int Failure To Record The Audio Track. | Replace Q4003, D4001, D4002, 2sb642rs/2sa564a. |
| NATIONAL | NV300 | Int Leds Come On | Ic6005 4069 |
| NATIONAL | NV300 | Int Non Erasure Of Previous Sound Track. Chroma Sig. Remain | Look For D.J On Bias Osc Q4014. |
| NATIONAL | NV300 | Int Wont Go Into Record, Or Stops Recording | Record Tab Switch Vsm0043 |
| NATIONAL | NV300 | Int Wont Start Drum | Replace C2026, 2027, 2028 .22µ 50v Caps |
| NATIONAL | NV300 | Interm. Not Rec. Audio. No Audio Record. | Solder Wire From Connector Bp6009 Pin 1 Directly Onto Pcb. |
| NATIONAL | NV300 | Mechanical Mode Switch Check. | Pins Of Bp6003 Should Go Low. stop Mode - 5, Laced Up Play Or Record - 1, F.Fwd. Rew. - 4, Record Pause - 3, Eject - 6. |
| NATIONAL | NV300 | Missing 13v Rail | R1006 1O Fuseable |
| NATIONAL | NV300 | Mode Sele. Switch Wont Return To Normal Pos.Cass Wont Engag | Check Q6010, Q6026, Q6028, Q6029 And R6023, R6024. |
| NATIONAL | NV300 | No 18 V Capstan Motor | R1010 (3O3), D1007 |
| NATIONAL | NV300 | No Capstan 18v | Check R1010 (3.3ohm). |
| NATIONAL | NV300 | No Clock | Ic7501 Mn1435vxb |
| NATIONAL | NV300 | No Clock Or Channel Display. | Change Ic7502(an5033) |
| NATIONAL | NV300 | No Drum | Q6002 2sb641 |
| NATIONAL | NV300 | No Erase. Bias May Be Int. | C24 10 Vfd 16v Int. |
| NATIONAL | NV300 | No Functions | Q 6008 |
| NATIONAL | NV300 | No Functions Ex Eject | Remote Control Socket Vej0229 |
| NATIONAL | NV300 | No Functions Operating | Change Q6008 |
| NATIONAL | NV300 | No Go. | Timer Record Switch. |
| NATIONAL | NV300 | No Picture. Horizontal Lines, Wowing Sound. | Change Ic2003. |
| NATIONAL | NV300 | No Play, Eject Etc. | Cass. "in" Switch (dirty). |
| NATIONAL | NV300 | No Power. No Functions. | Check Remote Control Socket. |
| NATIONAL | NV300 | No Reel Drive | Ic6006 µpc358, Motor Myn13v5l |
| NATIONAL | NV300 | No Reel Motor Drive. | Pin 7 Of Ic6006 Should Read 14.2v Disconnect Pins 5 And 6 If Then Ok Replace Icupc358c. |
| NATIONAL | NV300 | No Regulated 13v | Check Q6002 (qsb641) |
| NATIONAL | NV300 | No Tape Functions. | Check And Replace Load Motor Drive Transistors. |
| NATIONAL | NV300 | No Tuner In Ee, Or Channel Indication | R7020 3O9 On Demodulator Pcb |
| NATIONAL | NV300 | No Video In Ee Mode | Q703 2sd945 |
| NATIONAL | NV300 | No Video In Play | Q3022 2sd636 |
| NATIONAL | NV300 | No Video In Record | Q3017 2sb641 |
| NATIONAL | NV300 | No Video On Playback, Blank Raster Only. | Check Q3022 (2sd636). |
| NATIONAL | NV300 | No Video On Tuner. | Check Q3017 (2sb641). |
| NATIONAL | NV300 | Not Recording Or Erasing | Q6005 2sa719 |
| NATIONAL | NV300 | Not Tunning Stations | R7019, D7006 |
| NATIONAL | NV300 | Picture Fuzzy In Playback And Ee Through Rf Out Only. video Out O.K. | Replace Faulty Capacitors C9, C4, In Rf Modulator. (not Rf Box Where Leads Go In). |
| NATIONAL | NV300 | Plays For A While Then Stops. | Mode Switch. |
| NATIONAL | NV300 | Poor Or No Lum In Play | C3007 10µf/16v D3012 |
| NATIONAL | NV300 | Records Low Audio On New Tapes But Loud Audio On Old Tapes. | Replace Audio Control Stack. |
| NATIONAL | NV300 | Rewinds And Ejects Intermittently. | Change Q6010 (2sd636) |
| NATIONAL | NV300 | Slow Rewind | Clean Supply Reel Shaft |
| NATIONAL | NV300 | Snatching Tape In Review | Excessive Wear In Reel Idler |
| NATIONAL | NV300 | Stays In The Eject Mode And Wont Accept Tapes. | Change/replace All Four Q6025, Q6028, Q6029, Q6030 And Ic6005 (upd4069ubc). |
| NATIONAL | NV300 | Supply Voltage 15 V Low | C1003 3300uf25v |
| NATIONAL | NV300 | Tape Speeds Increases In Pause Mode. | Change Qr201 (dtc124a) In Noise Advance Pack. |
| NATIONAL | NV300 | Trouble With Tape In Review | Lower Drum Worn Sticking To Tape Polish |
| NATIONAL | NV300 | Tuner Not Working, No Leds On Tuning. | Check R7020 (3.9ohm) Fuseible On Demodulator Board Also D7007. |
| NATIONAL | NV300 | Tuner Not Working. | Check 30v Missing On Tuning Pots Because Ic7001 S/c. |
| NATIONAL | NV300 | Vcr Stays In Rec Mode | Ic6005 |
| NATIONAL | NV300 | White Flickers On E-e And Playback. | Check 5v Line For Ripple (5mv P-p Normal) |
| NATIONAL | NV300 | White Lines In Play, Ee | Ripple In 5 Volt Rail |
| NATIONAL | NV300 | Wont Go Into Mode Or Goes Berserk. | Ic6001 (mn1405) Faulty. |
| NATIONAL | NV300 | Wont Go Into Mode Selected, Goes Berserk In Play Mode. | Check Faulty Ic6001 (mn1405vkf) Note These Last Three Letters Are Important, Must Replace Only With Original Part Being Replaced. |
| NATIONAL | NV300 | Wont Lock In On Playback. | Check Ic3003 (an6327) In Luminance Channel. |
| NATIONAL | NV300 | Wont Play. Tape Loaded. Capstan Not Functioning. | Replace Both Loading Belts. |
| NATIONAL | NV300 | Wont Select Play, Eratic Tape Functions | R6056 680O Resistors Near Bj6007 Pin 2, Shb 5.24 V No Load. |
| NATIONAL | NV300 | Wont Tune Channels. | R7019 O/c Tuner Board. |
| NATIONAL | NV3000 | Capstan Motor On Ay All Times. | Check Q1016, 2sd946, Under Shield On Main Pcb. Cap. Stop. Low Should Be At Base Of Q1016. |
| NATIONAL | NV3000 | Cuts Out In Play/fr/ff Ect | Electro Leaked. B/t P13 P14 Bottom Pcb Reel Pulse Low. |
| NATIONAL | NV3000 | Dew Sensor On At All Times. | Suspect Ic 5, An6912, On Front System Control Pcb. |
| NATIONAL | NV3000 | Dropout Compensator Not Operating,d/outs On Play. | Check Delay Line Dl3001, P.No. Vld0020. Rf Envelope Should Be Present At Both Input, Pin 1, And Output, Pin 3. |
| NATIONAL | NV3000 | Drum Motor Fails To Start, Interm. Stops During Play/rec. | Go To The Edge Of The Main Pcb That Has Many Plugs Mounted Along It. Measure Ohms Between Pin 8 Of P9 And Pin 5 Of P15. This Should Measure Approximately 1.8 Ohms. if Measures High, Replace R2120 Mounted On Jumper Wire Between Pin 8 And Pin 5. |
| NATIONAL | NV3000 | Int Lines In Pb. Drum Servo Fault | Dj On Leads To Cylinder Drive Pcb |
| NATIONAL | NV3000 | Int No Colour In Pb | C8041 10µf/16v, Ic8004 An6342n |
| NATIONAL | NV3000 | Int No Rewind | Q6552 T/up Sensor |
| NATIONAL | NV3000 | Int Traking Problems | Check R2088 100k Preset Dj's |
| NATIONAL | NV3000 | Lines In Picture. Mistraking. | Replace Back Tension Band If Faulty. |
| NATIONAL | NV3000 | No Audio In Pb | Q4 2sd655 Leaky |
| NATIONAL | NV3000 | No Audio In Record | C47 10µf/16v |
| NATIONAL | NV3000 | No Capstan | Q2020 2sb641 |
| NATIONAL | NV3000 | No Loading Motor | Cap On Top Pcb 6800µf/16v Shorted |
| NATIONAL | NV3000 | No Pic In Play, Distorted Video | C122 10µf/50v In Tuner |
| NATIONAL | NV3000 | Play Audio Volume Faulty. | Check C22, 16v 10 µf And C19, 16v 10µf, In Audio Section Of Chroma Pcb. |
| NATIONAL | NV3000 | Stops Int | Q6411 2sb641 On Load Mtr Pcb |
| NATIONAL | NV3000 | Turns Off After Several Sec's | R6417 3O9 Fuse Res. Load Mtr Pcb |
| NATIONAL | NV333 | 2sc2671 Transistor Used In The Booster Amp.,is Trouble . | Repair Kit, Part No. Vvk4059, Which Consists Of A 2sc2671 Transistor Plus Two Ma161c Diodes And Fitting Instructions. |
| NATIONAL | NV333 | Buzzing Sound. E-e Normal.Recording Sound Very Low, Buzzing | Change D1013. |
| NATIONAL | NV333 | Cant Tune Stations In, When In E-e Mode. | Check Tuner. |
| NATIONAL | NV333 | Capstan Runs Too Fast. | Check Faulty Fg In Capstan Motor. |
| NATIONAL | NV333 | Capstan Speed Varies, Sometimes Intermittently. | Monitor The Capstan Fg Pulses At Pin 5 Of P6001. If The Pulses Disappear Intermittently, Suspect A Faulty Fg Generator. This Is Within The Capstan Motor - Check The Interconnections First. |
| NATIONAL | NV333 | Capstan Speed Wanders In Playback. | Check Whether Tracking Control R2064 O/c. |
| NATIONAL | NV333 | Cass. Wont Eject, Or Carry Out Deck Functions. | Suspect The Mode Switch. |
| NATIONAL | NV333 | Cassette Carriage Ascends Too Quickly. | Teeth In Damper Unit Worn. Part No. Vdg0100. |
| NATIONAL | NV333 | Clock Failure With No Display. | Check 100 Ohm Safety Resistor (r7632 In Nv 366), Check Back Up Battery Is Not Leaking. |
| NATIONAL | NV333 | Clock Not Lighting, Capstan Motor Not Turning. | No 18v Due To Q1002 (2sd973) Being O/c. |
| NATIONAL | NV333 | Clock Wont Relight After Mains Supply Interruption. | Change Ic7501. |
| NATIONAL | NV333 | Distorted Sound With Corrugated Verticals. | Thoroughly Clean The Erase Head - Replace If Necessary. Can Also Be Caused By A Worn Audio/control Head (vbr0050). |
| NATIONAL | NV333 | Drum And Capstan Servos Pulsing And Out-of-sync. | Check R2017 Is Dirty. |
| NATIONAL | NV333 | Excessive Noise In The Load And Unload Modes. | Replace Reel Idler Arm Vxl0997. |
| NATIONAL | NV333 | Failure To Eject. | Check Switch, If Ok, Check C6011 (18µf) And Ic6002 (m53216p). |
| NATIONAL | NV333 | Failure To Record The Sound. | Change The Str1096 Regulator Ic1001 In The Power Supply. |
| NATIONAL | NV333 | Goes Into F.F. As Soon As The Try Is Closed. | Faulty Supply Reel Sensor. |
| NATIONAL | NV333 | Head Switching Line Runs Through Picture. | 50hz Reference Switched On During Recorded Because Ic8004 (an6342n) Faulty. |
| NATIONAL | NV333 | Hum On E-e Sound, Amplified To An Obliterating Buzz On Rec. | Check For Hum On The 17v Rail. If Present D1013 (1ss16) Faulty. |
| NATIONAL | NV333 | Hum On Sound. | Ic4001 (ta7325p) Developing Hum Internally. Check The Inputs And Outputs With Scope. |
| NATIONAL | NV333 | In Reverse Pic. Search Mode The Tape Loops Into Machine. | Faulty Head Drum. (the Engraved Tracks Wear Thin And The Tape Sticks). |
| NATIONAL | NV333 | Inter. Head Switching Line Runs Through Pic.,drum Speed Var | Vss Signal Missing Due To A D/j At Pin 1 Of Ic301. |
| NATIONAL | NV333 | Interm. Loss Of Colour Or Interm. Colour Bars On Screen. | Check If The Pulses At Tp8006 Are Less Than 6v P-p, Adjust R8036 To Correct. |
| NATIONAL | NV333 | Intermittent Audio Erase. | Remove R4049 (4.7) In The Bias Oscillator Circuit And Replace With A Shorting Link. |
| NATIONAL | NV333 | Intermittent Chroma On Record. | Connect A Fast-acting Diode (ma161 Or Ma162) Between Pins 11 And 12 Of Ic6003 On The Syscon Board, Cathode To Pin 11. |
| NATIONAL | NV333 | Intermittent Failure To Eject Tape. | Check Key Scan Inhibited Due To C6011 (ecqv05184jz) Or Ic6002 (m53216p) Faulty. |
| NATIONAL | NV333 | Intermittent Loss Of Capstan Lock In The Record Mode. | Suspect An Intermittent Fault In Ic2003 (upc1505c). |
| NATIONAL | NV333 | Intermittently Cuts Out On Deck Functions. | The Counter Has A Hall-effect Sensor. Any Of The Following Can Cause The Complaint: The Reel Idler, Idler Arm, Counter Belt, A Tight Take-up Reel, The Hall-effect Device Faulty Or Too Far From The Magnet, Or A Defective Reel Motor. |
| NATIONAL | NV333 | Knocking Noise On Fast Forward. | Noise Affected By Pressure On The Cassette. Lubricate The Spool Shafts. |
| NATIONAL | NV333 | Lid Wont Stay Down. Seems To Be Permanently In Eject Mode. | Check The Operation Of The Cassette Down And Loading- end Switches, Mode Select Switch. |
| NATIONAL | NV333 | Loading Motor Continues To Run. Stays In Loaded Condition. | A Very Common Cause Of This Problem Is Slippage Of Loading Belt 2. If Replacing This Doesn't Provide A Cure, Suspect Misadjustment Of (or Fault In) The Mode Switch. Its Mechanical Adjustment Is Very Critical. |
| NATIONAL | NV333 | Loading Motor Stops During Loading. | Ic6005 (upd4069ubc) Probably Faulty. Also Check That C6008/9 Have Been Changed From 100pf To 300pf. |
| NATIONAL | NV333 | Machine Intermit. Stops And Rewinds During P/back,or Rec. | Supply Phototransistor Q1503 (pn150nv) Faulty. Sometimes Ic6004 (an6912) Is Respnsible. |
| NATIONAL | NV333 | Machine Wont Switch On. | Power On/off At Pin 3 Of P1003 Not Switching Due To A Faulty M53216p Chip (ic6002) In The Syscon Circuit. |
| NATIONAL | NV333 | No Capstan Lock In Playback. | Check The D.C. Level At Pin 16 Of Ic2003 (upc1505c). If Low Suspect No 9v Supply As Q6003 (2sa719) In The Syscon Circuit Is O/c. |
| NATIONAL | NV333 | No Capstan Motor Rotation. | Check Ry1 On The Servo Panel Faulty. |
| NATIONAL | NV333 | No Chroma In The Record Mode. | If The Chroma Is Present At Tp8003 Check At Pin 8 Of Ic8001 (an6360). If The Chroma Is Missing Here And The D.C Level Is High (should Be Aspprox. 4.5v) D8005 (ma165) Is Probably Leaky - It Links Ic8001 To The Colour Killer In Ic8003. |
| NATIONAL | NV333 | No Clock Display. | Ic7501 On The Front Panel Is Faulty. In The Nv333 It's Type Mn1435vxb. Getting The Suffix Right Is Vital. |
| NATIONAL | NV333 | No Deck Functions. | Cassette Down Switch On Eject Latching Assembly Dirty Or Worn. Part No.Vsh0013. |
| NATIONAL | NV333 | No Eject Damping - The Gear Teeth Inside Damper Unit Break. | Replace The Unit. |
| NATIONAL | NV333 | No Field Lock In Playback. | Change Ic3003 (an6327) |
| NATIONAL | NV333 | No Field Sync On Playback. | Check The Signal At Pin 1 Of Ic3003 (an6327). If Missing, Suspect Ic3003. The Signal Should Be 2v P-p. If Less Than 1v P-p, Change Ic3003. |
| NATIONAL | NV333 | No Functions Except Eject. | Check For Dirty Contacts On Thr Cassette-in Switch. |
| NATIONAL | NV333 | No Go. | If Pin 8 (power Off) Of Ic6001 Is High, Q6010 (2sb641) Faulty. |
| NATIONAL | NV333 | No Go. | No 9v And 6v Outputs From The Str1096 Chip Ic1001 At Pins 4 And 5 Respectively. Check Whether The Unregulated 15v Supply Is Present At Pin 1. If This Is Present And The Supplies Dont Return When The Loads Are Disconnected Ic1001 Is Faulty. |
| NATIONAL | NV333 | No Playback Colour, Unlocked Colour Flickering Occasionally | If Pin 9 Is Linked To +5v And Colour Comes Back Ic3002 Faulty. |
| NATIONAL | NV333 | No Power After 10 Sec., With No Loading. | No Loading Motor Drive As Ic6005 (upd4069ubc), Q6026 (2sb819) And Q6029 (2sd1051) Faulty. Change C6008 And C6009 (300pf)> |
| NATIONAL | NV333 | No Reel Drive. | No Motor Drive As Q6022 (2sb641) And Q6023 (2sd12730) S/c. |
| NATIONAL | NV333 | No Rewind Or Fast Forward With No Cue Or Review. | Check Q6023's Emitter For Dry Joint. |
| NATIONAL | NV333 | No Rewind Or Fast Forward. | D1009 (ma165 Or 1ss133) Faulty. |
| NATIONAL | NV333 | No Tuner Operation Or Channel Leds. | Check 3.9 , 0.5w Safety Resistor R7020 Is Probably O/c. |
| NATIONAL | NV333 | No Tunning. | Tuning Voltage Missing R7019 (100 Ohm, 0.25w) O/c. The Upc574jk Stabilizer Ic7001 And Q7005 (2sb642) Probably S/c. |
| NATIONAL | NV333 | Permanent Eject. | Change Q6028. |
| NATIONAL | NV333 | Poor Field Sync On Playback Of Own Rec. Hum, Ripple On Edge | Check Hum On Thr 1.T. Lines Because One Of The Em1z Rectifier Diodes D1001-4 Is O/c. |
| NATIONAL | NV333 | Poor Recording And Sound Coming Through From Other Channel. | Dry-joints On The Bias Oscillator Transistors Q4014. |
| NATIONAL | NV333 | See Nv366 | |
| NATIONAL | NV333 | Sluggish Rewind. | Check If The Reel Idler Is Ok Check The Supply Reel - it's Probably Tight On Its Shaft (lubricate As Necessary). |
| NATIONAL | NV333 | Sometimes Wont Rec. Or Play. F.F. And Rew. Ok. | Set Up The Cam Gear And Action Gear As Per The Manual. Clean The Belt And The Pulley Wheels. |
| NATIONAL | NV333 | Squeaking Capstan. | Put Into The Pause Mode To Confirm. This Fault Can Be Caused Either By Worn Bearings In The Capstan Motor Itself (max13v9lp), Or By A Dry Flywheel Bearing. |
| NATIONAL | NV333 | Squeaking Noise Which Stops In Pause. | Noisy Capstan Motor. |
| NATIONAL | NV333 | Squeaks When Loading Or Unloading. | Lubricate Loading Roller Bearings. |
| NATIONAL | NV333 | Take-up Spool Rotates In The Stop Mode. | Check For Dirty Connections At The Supply Photosensor Connector P6010. |
| NATIONAL | NV333 | Tape Is Not Reeled Back Into The Cassette During Unloading. | Replace The Reel Idler (vxp0401) And Check The State Of The Intermediate Geaar (vdg0017). |
| NATIONAL | NV333 | Tape Loops Into The Machine In The Review Mode. | This Is Caused By Excessive Friction At The Drum. It's Sometimes Due To The Grooves On The Drum Being Worn, Or A Worn Lower Drum. |
| NATIONAL | NV333 | Tape Snatching In The Review Mode. | Check Excessive Play In The Joints Of The Reel Idler Arm (vxl0997). If A Replacement Doesn't Provide A Cure, Fit A Washer On The Joint. |
| NATIONAL | NV333 | Tape Will Not Unlace Or Will Not Complete Lacing. | Replace The Large Loading Belt And Check The Others. |
| NATIONAL | NV333 | Tuning Drift. | Remove C7010 (0.22uf) On The Demodulator Pcb. |
| NATIONAL | NV333 | Wavering Playback Sound. | Check For Worn Capstan Motor. |
| NATIONAL | NV333 | When Cass Is Loaded The Machine Wont Respond To Any Command | Check The Cassette-down Switch Under The Main Board. |
| NATIONAL | NV333 | When Review Is Selected The Machine Ejects The Cassette. | Check For Faulty Or Misaligned Mode Switch. |
| NATIONAL | NV333 | Whine Or Whistle From Direct-drive Unit. | Check The Discharge Angle At The Top Of The Drum Was Worn. Sometimes The Dd Motor Bearings Become Noisy. |
| NATIONAL | NV333 | Won't Switch Off, Even When Timer Button Is Pressed. | The 2.5a Fuse On The Mains Transformer Pcb Is O/c. Change Ic6002 (m53216p). |
| NATIONAL | NV333 | Won't Tune In. | No 30v Supply At Pin 10 Of P7005 Because D7005 (ma26wcb) In The 30v Regulator Circuit On The Demodulator Pcb Is S/c. |
| NATIONAL | NV333 | Wont Eject And No Other Functions Work. | Check Eject Switch Sw6501. |
| NATIONAL | NV333 | Wont Erase Prev. Sound Track. Pic. Has Chroma Washover. | Check For No Erase Bias, Probanly Because Of D/j's On Q4014 And T4001 On The Audio Panel. If The Problem Persists, Or Low Bias Seems To Be Incurable, Link Across R4049 (4.7mfd) In Q4014's Emitter Circuit. |
| NATIONAL | NV333 | Wont Lock In The Playback Mode. | Q6003 O/c. |
| NATIONAL | NV333 | Wont Rec In Colour. Replays Prerecorded Tapes In Colour. | D8005 (ma165) Which Turned Out To Be Leaky. |
| NATIONAL | NV366 | Bottom Half Of Pic., Covered In White Noise Spots, Flicker. | Replace Rl3501 & Rl3502. |
| NATIONAL | NV366 | Cass. Stuck, Only Clock, Programmer Work. | Sitch Ing Off The Power For A Long Time Restores Normal Operation Until Next Lock-up. Check The Syscon Microcomputer Chip That Its 5v Supply (pin 39) Is Present And Correct, With No Ripple/hash. If Ok Change (mn1405vkk). |
| NATIONAL | NV366 | Channel Change Faulty, Wrong Led Lights Up.More When Cold. | Replace Q7553 (2sd637) With Improved Typ[e 2sd637s Or T Or Type 2sc1685s Or T. In Addition Fit A 2.2k Resistor In Unused Position R7565. |
| NATIONAL | NV366 | Check 3.3mfd 2.0v (3 Off). | Leak Goo Into Board, Sparks When Hit With Soldering Iron. Check Also R1101. .12 Ohms For O/c. |
| NATIONAL | NV366 | Cue/review Modes Are Released And Returns To Play. | Check Dirty Contacts On Switching Relays Rl3501/2. Replace Both (part No. Vsy2029) |
| NATIONAL | NV366 | Interm. Noisy Picture,tracking Control Has No Effect. | Replace Faulty Switching Relays. |
| NATIONAL | NV366 | Intermittently Incorrect Capstan Speed. | Check The Capstan Fg Signal At Tp2007. When Motor Is Gently Tapped The Speed Corrects Itself. Change Motor - (the Capstan Fg Generator Is Built Into The Motor.) |
| NATIONAL | NV366 | No Clock Display. | Ic7501 On The Front Panel Is Faulty In The Nv366, It Is A Mn1455bub. Getting The Suffix Right Is Vital. |
| NATIONAL | NV366 | Pic. Noisy After The Still. | Check Dirty Contacts On Switching Relays Rl3501/2. Replace Both (part No. Vsy2029) |
| NATIONAL | NV366 | Saturated Colours From Pre- Recorded Tapes Only. | Check Back Tension Should Be 25/30 Grams. |
| NATIONAL | NV366 | See Nv333 | |
| NATIONAL | NV366 | Still Mode Pic. Has Black Spikes. | Replace C3529 And C3530 With 40pf Type Ecv1zw40x53n Capacitors And Change R3522 To 100. Fit A 22pf, 50v Capacitor (c3535) Across Pins 1 And 2 Of P002. Readjust The Head Amplifier Peak Frequency (tp3508) To 4.9 Mhz Instead Of 4.5mhz. |
| NATIONAL | NV366 | This Machine Doesn't Like Hg Tapes. | Machine Will Squeal In Record And Playback. E180 Tapes Work Ok. |