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2-1. Notes on Power Supply Block
2-1-1. Warning on Primary Circuit Block and
Electric Shock
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The primary circuit consists of the AC-169 board with AC
inlet, the circuit breaker, the POWER switch, and the
power supply unit.
Be careful not to receive an electric shock when perform-
ing the maintenance and service works with the power
turned on.
A primary voltage remains applied to the AC-169 board,
circuit breaker, and POWER switch even if the POWER
switch is turned off. For the work that requires no current
conduction, therefore, turn off the POWER switch and
disconnect the power cord.
2-1-2. Note on Resetting the Circuit Breaker
The circuit breaker of a primary circuit is mounted on the
power panel of this unit. When an overcurrent flows in the
primary circuit, the breaker operates and the button
protrudes.
If the breaker operates, eliminate the cause for which an
overcurrent flows, then push the button.
DNW-A22/A22P
Section 2
Service Overview
2-2. Cleaning when the Heads are
Clogged
Clean using a cleaning cassette tape (specified product:
BCT-5CLN) when the video heads are clogged.
For the cleaning, refer to "5-2-1. Cleaning using Cleaning
Tape".
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Clean the video heads in the prescribed procedure using a
specified cleaning cassette tape. If not, the video heads
may be abrasive or damaged.
If the head clogging is not solved using a cleaning cassette
tape, use a cleaning cloth.
For the cleaning using a cleaning cloth, clean according to
the procedure of "5-2-3. Tape Running Surface of Upper
Drum and Video Heads Cleaning" after confirming the
cautions and preparation in "5-2-2. General Information
for Cleaning using Cleaning Cloth".
2-1
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