Service manual

5
METHOD OF REMOVING BACK CABINET
(see Fig. 2)
Attn.: Before disassembling the back cabinet, first draw the power cord plug of the receiver from AC outlet.
1. Disconnect the antenna cable from the antenna terminal.
2. Loosen the 5 pieces of screw (A) used in fixing the antenna jack plate on the back cabinet.
3. Loosen the 9 pieces of screw (B) used in fixing the back cabinet to the front cabinet; then remove the back cabinet.
Screws(B)
Screws(B)
Screws(A)
Fig.2
METHOD OF REMOVING PICTURE TUBE
(see Fig. 4)
After taking out the chassis holder (main chassis), proceed the following procedures accordingly:
1. Turn the receiver down and let the screen of the picture tube face downward, and put it on a soft cushion.
2. Loosen the 4 pieces of nut used in fixing the picture tube on the front cabinet, remove the degaussing coil; then use
two hands to hold the edges of the picture tube tightly and draw it out.
3. Detach the ground wire of the picture tube which is attached to the lugs of the picture tube with springs.
Fig.4
SUGGESTION: Before servicing the chassis, please read through “X-RAY RADIATION PRECAUTION",
"SAFETY PRECAUTION" and "PRODUCT SAFETY NOTICE" at Page 2 & 3
of this manual.
GENERAL ADJUSTMENT INSTRUCTIONS
This receiver is transistorized and special care should be taken when servicing. If not necessary, do not attempt any
adjustments because the requirements of the procedures are very stringent. Read the following matters before
attempting any adjustments.
An isolation transformer should be used during any dynamic service to avoid possible electric shock hazard.
The test equipment specified or their equivalent is required in having proper alignment. Using unsuitable equipment,
which do not meet these requirements, may result in improper alignment.
Correct matching of the equipment is essential. Failure of using proper matching will result in responses which cannot
show the true operation of the receiver.
Excessive signal by using a sweep generator can cause the receiver circuit overloaded. Overloading should be avoided
to obtain a true response curve. Insertion of markers by using the marker generator should not cause the response
curve distorted.