NATIONAL VCR's

NATIONAL NVAM1 Switchmode Supply Starts Then Stops After 2 Seconds. D4 Leaky
NATIONAL NVAM1 Switchmode Supply Won't Start. R13 O/c Or Hr
NATIONAL NVAM3 Switchmode Supply Starts Then Stops After 2 Seconds. D4 Leaky
NATIONAL NVAM3 Switchmode Supply Won't Start. R13 O/c Or Hr
NATIONAL NVG10 Colour Drop-outs And Lines. C1002 100uf/35v
NATIONAL NVG10 No Channel Select, Number Indicator, Or Preset Check For 30v At Pin 8 Of Plug Ja. If Missing,check R7572, 47k Ohms, In The Tuner And Demodulator Section Of The Main Pcb.
NATIONAL NVG10 See Nvg7  
NATIONAL NVG10 Vtr On/off Faulty. Red Vtr Indicator Flashes When Vtr Off. Check For Open Circuit D1006, Ma165,near Ic 1 In Power Section Of Main Pcb.
NATIONAL NVG11 Breaking Tapes. Faulty Hall Effect I.C. On Stator.
NATIONAL NVG11 Tuning Problems With E7 Serial No Prefix. Change Ic7551 O7555 Q7551 Q7552 Because I.C. Legs Bend Over And S/c's Are Produced.
NATIONAL NVG12 Damaging Edge Of Tape In Play Or Rec Modes. Adjust P5 Post.
NATIONAL NVG12 Mistraking. Noise Bars In Picture. Replace Pinch Roller With New Part Number Vxl17433.
NATIONAL NVG12 See Nvg7  
NATIONAL NVG16 No Display, No Functions,operate Light On Dry Joints To Q15 Drum Heater. (series Pass For + 6v Reg.)
NATIONAL NVG18 See Nvg7  
NATIONAL NVG21 No Or Intermittent Power C25 & C18 (47uf 50v) O/cct In Power Supply. Low +23 To Regulator Ic.
NATIONAL NVG21 Red Vtr Indicator On,wont Turn Off,no Clock. Check Volts On Pin 10 Of Ic 7551, An5034,in Ch. Select Section Of Main Pcb At Rear Of Board. Section Ref.No. 7500 Series. Pin 10, Pclr Line Goes To Pin 11 Of Ic 7502, Mn1220 On Display Pcb.
NATIONAL NVG21A No Power.Chopper Faulty And Clicking Noise. Insulation Between Chopper And Power Box In Wrong Position.
NATIONAL NVG22 Vtr Operate Light On. Vcr Function May Still Work. Clock Shuts Down. Noise On Pins 2,3,4, Of P1001(socket On Switch Mode Pwr Supply). Change C1023 10v 1000uf Capacitor.
NATIONAL NVG25B Interm. Sound And Pic. Dropouts,creasing Bottom Of Tape Pinch Roller Barrel Shaped.See Page 61 Of V.C.R. Technical Service Information For Diagram.
NATIONAL NVG25B Interm. Sound And Pic. Dropouts,creasing Bottom Of Tape. Pinch Roller Barrel Shaped. Check If The Creasing Occurrs When The Tape Moves In The Fully Laced Position.
NATIONAL NVG25B No Video On Monitor In E-e Or Play. Check If Q3501 (2sc2206) O/c (2sd636 Can Be Subs.) D3502 (ma27w) O/c.
NATIONAL NVG30 Poor Colour Or Flashing In Play. C2 In Power Supply Near Regulator.
NATIONAL NVG40 No Power Dead. Replaced Fuse F1001.
NATIONAL NVG40 Poor Capstan Torque, Causing Motor To Stall During Changes Of Cassette Functions And Vtr To Turn Off Intermittently Suspect Faulty Ic2501, Ba6432s On Sub Main Cba
NATIONAL NVG40 When Tape Inserted At Very Beginning. Machine Ejects Tape. Replaced Both End Sensors.
NATIONAL NVG500 Power Supply Fails To Start Or Restart After Power Interruption. C1003 1uf/350v Cap O/c.
NATIONAL NVG7 Int Failure To Retract Tape When Unloading. Faulty Mode Select Switch Pt. No. Vss0110.
NATIONAL NVG7 Int Stop In Play Mode Or Rec. Or No Take Up. Faulty Mode Select Switch Pt. No. Vss0110.
NATIONAL NVG7 No Power Up At All.Reset Being Held High. Vr7502 Out Of Tolerance. Ajust Until Power Up.
NATIONAL NVG7 Unit Accepts Tape Then Rejects It. Check End Sensors Aren't Leaky R6009 For Shorts To Surrounding Circuit.
NATIONAL NVG9 Drum And Capstan Motors Not Locking. Main Regulator Ic Stk5331..12v Line Faulty.
NATIONAL NVG9 Wont Memorize Tv Stations. Repalce Ic 7502 And Check Cap 7510 10µ50v
NATIONAL NVH65 Plays Black And White. Capstan Speed Varies In Play. C1023 (1000uf 25v) Low Or O/cct. Excessive Ripple
NATIONAL NVH70 Memory Of Preset Tv Stations Faulty. Suspect Faulty Ic 7502, Mn1220.
NATIONAL NVH70 Memory Of Tv Stations Faulty. Suspect Faulty Ic7502, Mn 1220.
NATIONAL NVH75 Drum Servo Pulses In Speed. C10028 (330uf/35v) Faulty. Noisy +5 And +6v Power Rails.
NATIONAL NVH75 No Drum Or Capstan Lock, Interferance On Ee Picture Repalce C1028 330µ25v (use 105 Deg Cap) In Psu, It May Read Ok
NATIONAL NVH75 No Power Check Q1006, 2sc1384 (r,s) In Power Cba Unit. Check Diode D1008, Ma185.
NATIONAL NVM1 Picture Goes Green Then No Colour. Check Pin 12 Of Ic401 Should Be 2.5v If Higher Replace Ic401.
NATIONAL NVM5 Noisy Audio On Playback Of Own Recordings. Check Isloate Dc Lead Rubbing Against Drum Motor. (picking Up Noise.)
NATIONAL NVM5 Screen Is Brilliantly Lit Up. Check -5 Line Drive From Transformer Power Pack (diode Goes O/c)
NATIONAL NVM5 Unit Turns On By It Self After A While. Also Wont Turn Off Sometimes.. Operate Switch Faulty..
NATIONAL NVM5 Unloading Is Complete. Because Pinch Roller Returns In Front Of Drum Exit Loading Guide, Remove Excess Grease On Cam Gear, Clean Hardened Grease Out Of Teeth Of Loading Gear.
NATIONAL NVM7 Clock And Calender Not Functioning. Check For D/j's On Pin 31 Of Ic1.
NATIONAL NVV10 Display Flickers. Caps C111 & C108 330 µ & 100 µ Repalce.
NATIONAL NVV10 No Go Caps In Power Supply, C106 2200 µ 16 V Cap Leakie
NATIONAL NVV10 See Nv100  
NATIONAL VWA18 No Operation Or Power. Internal Fuse In Primary Of Mains Transformer May Go Open Circuit. Take Leads 2 From Fo1 To Bluem Wire, Pin 8 Of Voltage Select Switch, Sw02.
NATIONAL VWA18 No Operation Or Power. Check For Short Circuit Diode. Diode Has No Reference Or Location Number And Is Not Shown In Service Manual Diagram. Located Next To C13 Near Large D11.
NATIONAL VWA18 Unit Stays In Tv Mode Wont Switch To Vtr Mode. Check For Open Circuit R11, 39 Ohms, On Front Operation Pcb.
NATIONAL VWCG1 See Nv-m7  
NATIONAL VWET180 No Clock Display. Poss. Tuner & Vtr/tv Indicators On. Suspect Ic6723, Mn1512vtp, On Main Timer Pcb.
NATIONAL VWET180 Switch Mode Noise Audible C105 1000uf 16v O/c Or Low Capacitance.
NATIONAL WAM7A Not Charging Batteries Q101 (2sb952) Dry Joints On Base And Collector Also Broken Base Track.Ilastic Transistor Caseto Dampen Movement.

Last Updated on 20/09/98
By Allan
Email: allan@vidcam.com.au