37GQ-20 (serv.man3). (including circuit diagram and parts listing) for the version 02 chassis - Sharp TV Service Manual (repair manual). Page 3

Maintenance and repair of this receiver should be done by qualified service personnel only.

When servicing the high voltage system, remove static charge from it by connecting a 10K ohm
resistor in series with an insulated wire (such as test probe) between picture tube ground tag and
high voltage lead. (AC line cord should be disconnected from AC outlet).

1. The Picture tube in this receiver employs Integral Implosion protection.
2. Replace with tube of the same type number for continued safety.
3. Do not lift picture tube by the neck.
4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high
    voltage completely.

This receiver is designed so that any X-Ray radiation is kept to an absolute minimum. Since certain
malfunctions and servicing may produce potentially hazardous radiation with prolonged exposure at
close range, the following precautions should be observed:

1. When repairing  the circuit, be sure not to increase the high voltage to more than 25.5 KV, (at beam
    1000

µΑ)

 for the set.

2. To keep the set in a normal operation, be sure to make it function on 22.4KV

±

1.5KV (at beam

   800

µΑ) 

 in the case of the set. The set has been factory - adjusted to the above mentioned high

   voltage. Always check the high voltage if there is any possibility that it might have changed as a
    result of the repair.
3. Do not substitute a picture tube with unauthorized types and/or brands which may cause excess
    X-Ray radiation.

In addition to the above checks, the following safety checks should also be carried out before  returning
the unit to the user.

1. Inspect all leads and dress to make certain that the leads are not pinched or that hardware is not
   lodged between the chassis and other metal parts.
2. Inspect all protective devices such as non-metallic control knobs, insulating fish papers, cabinet
   backs, adjustment and compartment covers or shields, insolation resistor-capacity networks,
   mechanical insulators etc.