Job Number

0204-52

Equipment type

Video Cassette Recorder

Maker + Model #

Panasonic (old model of the J30)

Made in

Japan

Comments

Seen by a previous technician and stated that fault is unservicable – audio head LM35.00 to repair.

BAD

1

 No audio.

2

 Picture rolls up / lack of stabilization

3

 Other faults not reported but occurs only when unit is cold:

i)                     bad counter (fails or very fast),

ii)                   REW/FF/Play controls do not repond (but not blocked mechanically)

iii)                  Unit cannot be powered off else by unplugging ac mains chord

GOOD

1

 Good mechanical and electronic functions.

2

 When hot, (after 1 hour or so) all faults mentioned in 3 disappear.

Full repair description and observations

1

 When started, the cold sypmtoms described in box 3 were observed ,but after 30 – 60 mins that the VCR was powered up, they did not show up, and the main fault was that there was no sound output and the picture suffered lack of stabilization and jumping.

2

 As expected there was some fault in the audio head / control  head block. I cleaned this with isopropyl alcohol and to my luck, the sound came, and picture stopped jumping.

3

 I cleaned all the tape track parts, such as rolelr guides, head, pinch roller, shaft etc. Additinally I setted up the control/audio head block alignmnet so that optimal sound is heard.

4

 Since the user did not wanted to spend much money for the repair, I decided that the power supply cold faults should be tackled in a separate fault at later stage when they get more serious. At present, when VCR is warm, these faults did not show up so there was no need to tackle this fault now.

Repair summary

DIRTY AUDIO HEAD / CONTROL HEAD BLOCK

Precautions, fouls and advises

1