Adjustment Of Vcr - Sharp VL-E610S Service Manual

5. ADJUSTMENT OF VCR

5-1. ADJUSTMENT OF VCR SECTION
5-1-1. Before starting the electric circuit adjustment
• Electric circuit adjustment becomes necessary, in most cases, when any of the wear mechanical parts or the video head
has been replaced. Before starting the electric circuit adjustment, be sure to check that the mechanical parts work well
(i.e., the mechanical parts have all been perfectly adjusted). In case a trouble or troubles are found in the electric
circuitry, be sure to pinpoint the cause(s) by using the measuring instruments described below. After locating the trouble
spot(s), then proceed to repair, replacement or adjustment. Do not change the positions of the controls when adequate
measuring instruments are not available.
• In order to implement a higher-density, smaller machine, most of the electric circuit parts used on the Circuit Boards
are of small-sized, surface-mounted type. For replacing part(s) as after-sales service, work with a soldering iron as
speedily as possible. The heat resistance of the surface-mounted components is poor, when compared with the larger-
sized discrete parts used for television sets and stationary decks, owning to their small sizes. Therefore, exercise due
care to avoid long-time exposure of the pins of these parts to the heat of the soldering iron which may possibly damage
them. Such care should be exercised especially for chip-layer capacitor replacement. It is advisable to use a
temperature-controlled ceramic soldering iron (temperature at the tip: 250°C, contacting time: less than 5 seconds).
< Adjusting the video/LCD section >
• Measuring instruments:
*Color monitor TV set
*Digital voltmeter
*DC power supply
*Audio generator (CR oscillator)
*Alignment tape (JiGWR5-5CSP)
*AC adapter
*AV output cable (accessory)
*Oscilloscope
*Frequency counter
*Signal generator
*Video recording tape
(For Y/C, audio and servo adjustments)
*DC cable (AC adapter accessory)
*Video extension cables
5-1
*Vector scope
VL-E610S/VL-E610H
VL-E660S/VL-E96E
VL-E98E