Sinclair Microvision MTV1 User Manual

Sinclair MTV1 service manual V2.1 Page 37 of 39
Visi
on IF board
Vision smearing
ST1, many of coils O/C will cause smearing
No or poor vision
L203, ST1, C201, C219, C218, C215, L205,
C214, ST2
High gain
ST1
AGC faulty
C216, R203, R205, RV20[illegible]
No sync
C216, ST1
Tuner bias incorrect
ST2
No –33V rail
ST2
High current
ST2, C213, ST1, C201, C209, C214
If the vision IF board is dead beyond resurrection (due to failure of the Sinclair chip(s)) it may still
be possible to make use of the chassis: see the later section Converting the MTV1 into a monitor.
Audio board
No detector
C305, TAA661, C307, C303, C314, C306
No audio
TBA820, R310
Distortion
Ceramic filter faulty
Misalignment
Power board faults
No raster
ST3, TR410 S/C, D413 S/C, D421, TR401, C29,
TR409,TR406, TR407, D19
Low or no EHT
C430, C432, D411
No video
TR491, ST3
No sync
R403, C415
No frame
D408, TR403, D409, TR402, C405, TR403,
C417
Frame faulty (inc shift)
D704, RV401, R702
Focus faults
D410, C431

Sinclair Microvision MTV1 Specifications

General

Brand	Sinclair
Model	Microvision MTV1
Category	TV
Language	English