REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
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Wednesday 11 December 2019

HOW TO REPAIR AIWA HVFX5840 STEREO VIDEO CASSETTE RECORDER, SMPS SCHEMATIC, IC VOLTAGE CHART


Applicable to Aiwa HV-FX7800, HV-FX5850, HV-GX1700, HV-GX1400, HV-GX1100
How to repair and assemble the deck mechanism, Gear wheel alignment, mechanism alignment check, Power board schematic and more
STEREO VIDEO CASSETTE RECORDER <7800/5850>  BASIC VIDEO MECHANISM  D33Y1-4HF/PAL(6721RF0450A)<7800,5850>
VIDEO CASSETTE RECORDER <1700/1400/1100>  BASIC VIDEO MECHANISM  D33Y1-2HD/PAL(6721RF0405A)<1700,1400,1100>
How to disassmeble the deck mechanism: Mechanism parts locations.
[When reassembly perform the procedure in the reverse order]
When reassembling, confirm Mechanism and Mode Switch Alignment Position.
When disassembling, the Parts for Starting No. Should be removed first.
Drum Assembly
1) Unhook the (H1) on the back side of the Chassis and separate the Cap FPC.
2) Remove three Screws (S1) and lift up the Drum Assembly.
3) Remove two Screws (S2) and Separate the Stator of Drum Motor.
4) Remove two Screws (S3) and Separate the Rotor of Drum Motor from the Drum Sub Assembly.
[When reassembling Cap FPC, two Holes of Drum FPC are inserted to the two Bosses of Holder FPC correctly.]
Plate Assembly Top, Holder Assembly CST, Guide CST, Bracket Side(L), Bracket Assembly Door, Arm Assembly F/L & Lever Assembly S/W
Plate Assembly Top
1) Unhook the (H1) and separate the Left Side.
2) Unhook the (H2) and lift up the Plate Assembly Top.
[When reassembling, confirm (A),(B) Part of the Plate Assembly Top is inserted to the (L),(R) Grooves of the Bracket Side(L) and Bracket Assembly Door]
Holder Assembly CST
1) Push the Lever Stopper (R) in the direction of the arrows (A) and move the Holder Assembly CST.
2) Push the Bracket Assembly Door to the right and lift up the Holder Assembly CST along the Guide Groove of the Bracket Assembly Door.
Guide CST
1) Unhook(H3) in the direction of the arrow and separate the left side.
2) Unhook (H4) as above No.1) and disassemble the Guide CST in the direction of the arrow.
Bracket Side(L) Bracket Assembly Door
1) Remove the Screw (S4) and disassemble the Bracket Side(L) in the front.
2) Remove the Screw (S4) and disassemble the Bracket Assembly Door in the front.
Arm Assembly F/L
1) Push the Arm Assembly F/L to the left and lift up it.
[When reassembling, confirm that the Gear(A) of the Arm F/L and the Gear(B) of the Gear Rack F/L are assembled as shown in picture]
Lever Assembly S/W
1) Hook the Spring Lever S/W on (H5).
2) Lift up the left side of the Lever S/W from the Groove(A) of the Chassis.
Arm Assembly Cleaner
1) Break away the (A) part shown above Fig. from the Embossing of the Chassis in the clockwise direction and lift up the Arm Assembly Cleaner.
Head F/E
1) Unhook the two Hooks (H1) on the back side of the Chassis and lift up the Head F/E.
Base Assembly A/C Head
1) Remove the Screw (S5) and lift up the Base Assembly A/C Head.
Brake Assembly Supply
1) Remove the Spring S Brake.
2) Hold the (A) part shown above Fig. A-4-1 and turn to the clockwise direction, and then lift up the Brake Assembly S.
[When reassembling, be careful not to change the Spring with below]
Brake Assembly Take-up
1) Remove the Spring T Brake.
2) Hold the (B) part shown above  and turn to the counterclockwise direction, and then lift up the Brake Assembly T.
[When reassembling, be careful not to change the Spring]
Arm Assembly Tension
1) Remove the Spring Tension.
2) Hold the (C) part shown above Fig.and turn to the clockwise direction, and then lift up the Arm Assembly Tension.
[When reassembling, be careful not to change the Spring]
 Reel Supply  & Reel Take up [S&T]
Lift up the Reel S and Reel T.
When reassembling, be careful not to change the Reel S and Reel T each other.
Lift up the Reel S and Reel T.
When reassembling, be careful not to change the Reel S and Reel T each other.
Support CST
1) Break away the (A) part shown . A-5-1 from the Embossing of the Chassis in the clockwise direction, and lift up the Support CST.
Base Assembly P4
Break away the (B) part shown  A-5-2 from the Embossing of the Chassis in the counterclockwise direction and lift up the Base Assembly P4.
Opener Lid
Break away the (C) Part of the Opener Lid from the Embossing of the Chassis in the Clockwise direction and lift up the Opener Lid.
Arm Assembly T/up
1) Just lift up the Arm Assembly T/UP
[When reassembling, confirm the opener lid is placed on the Hook(H1) of the Arm Assembly T/UP as shown]
Belt Capstan, Motor Capstan
1) Remove the Belt Capstan.
2) Remove three Screws(S6) on the back side of the Chassis and lift up the Motor Capstan.
When reassembling, Confirm the (A), (B) parts of Motor Capstan is located to the (A'), (B') of the Chassis.
Clutch Assembly D33-Y
1) Remove the Washer(W1) and lift up the Clutch Assembly D33-Y.
Lever F/R
1) Unhook the (H1) shown Fig. A-6-4 and lift up the Lever F/R.
[When reassembling, move the (C) part of the Lever F/R up and down, then confirm if it is returned to original position.]
Gear H-Up/D-K or Gear Up/D-K
1) Remove the Washer(W2) and lift up the Gear H-up/D-K.
2) Remove the Spring Up/D.
NOTE
Gear H-Up/D-K is for Hi-Rewind Models.
Gear Up/D-K is for Normal Models except Hi-Rewind Models.
Bracket Assembly Jog ,(Jog shuttle model option)
1) Remove the Screw(S4) and lift up the Bracket Assembly Jog.
Guide Rack F/L, Gear Rack F/L
1) Remove the Screw(S4) and lift up the Guide Rack F/L.
2) Lift up the Gear Rack F/L.
26. Brake Assembly Capstan
(4HD model option)
1) Hook the Spring Capstan on the Hook(H1).
2) Unhook the Hook(H2) and lift up the Brake Assembly Capstan.
[When reassembling, confirm that the Hole(A) of the Brake Assembly Capstan is aligned to the Hole(B) of the Gear Cam.]
Gear Drive, Gear Cam, Gear Connector
1) Remove the Washer(W1) and lift up the Gear Drive.
2) Lift up the Gear Cam.
3) Lift up the Gear Connector.
When reassembling, confirm that the Hole (A) of the Gear Connector is aligned to the Hole (A') of the Chassis
When reassembling, confirm that the Hole (B) of the Gear Cam is aligned to the Hole (B') of the Chassis
When reassembling, confirm that the (C) part of the Gear Cam is aligned to the (D) part of the Gear Drive as shown Fig.
Bracket Assembly L/D Motor
1) Unhook the three Hooks(H1),(H2) and push down the Bracket Assembly L/D Motor.
Gear Sector
1) Remove the Washer(W1) and lift up the Gear Sector.
30. Base Tension, Plate Slider, Lever Tension
1) Remove the Screw(S4) and lift up the Base Tension.
2) Lift up the Plate Slider.
3) Hold the (A) Part of the Lever Tension and turn to the counterclockwise direction, and then lift up the Lever Tension.
[When reassembling, turn the Lever Tension to the clockwise direction in maximum.  Push the plate slide right side to be guided by the shaft.
Gear Assembly P3, Gear Assembly P2
1) Unhook the two Hooks(H1) and lift up the Gear Assembly P3.
2) Unhook the two Hooks(H2) and lift up the Gear Assembly P2.
Base Assembly P3
Base Assembly P2
1) Move the Base Assembly P3 in the direction of the arrow of the Chassis Hole(A) and push down the Base Assembly P3.
2) Move the Base Assembly P2 in the direction of the arrow of the Chassis Hole(B) and push down the Base Assembly P2.
Arm Assembly Idler or Arm Assembly, Idler Jog
1) Unhook the Hook(H3) and push down the Arm Assembly Idler Jog.
NOTE: Arm Assembly Idler is for Normal Models.  Arm Assembly Idler Jog is for Jog Shuttle Models. When reassembling, confirm that the (A) Part of the Gear Assembly P3 is aligned to the (B) Part of the Gear Assembly P2 as shown.
Mechanism Alignment Position Check
1) Turn the Power S/W on and eject the Cassette by pressing the Eject Button.
2) Remove the Top Cover and Plate Assembly Top, visually check if the Gear Cam Hole is aligned with the Chassis Hole as below Fig.
3) IF not, rotate the Shaft of the Loading Motor to either Clockwise or Counterclockwise until the Alignment is as below Fig.
4) Remove the Screw which fixes the Deck Mechanism and Main Frame and confirm if the Gear Cam is aligned with the Gear Drive as below Fig. C-1(A).
5) Confirm if the Mode S/W on the Main P.C.Board is aligned as below Fig. C-1(B).
6) Remount the Deck Mechanism on the Main P.C.Board and check each operation.
Power schematic and voltage chart
Posted By: FRANK at 06:13
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