Replacement Of Magnetron (V1/V101/V201); Replacement Of Trhpl (A202/A303) (Jma-9833-Sa/9832-Sa); Replacement Of Diode Limiter (A203/A303); (Jma-9823-7Xa/9Xa, Jma-9822-6Xa/9Xa) - JRC JMA-9832-SA Instruction Manual

......Replacement of Magnetron (V1/V101/V201)...........................

Remove the shield cover of the modulator and check that no charge remains in the high-voltage
modulator circuit. Then, remove the socket of the magnetron. The magnetron can be demounted by
removing the screws fixing it. When mounting a new magnetron, do not touch the magnet with a
screwdriver or put it on an iron plate. After replacement, connect the lead wire correctly.
Handling of Magnetron under Long-Time Storage
The magnetron that has been kept in storage for a long time may cause sparks and operate unstably
when its operation is started. Perform the aging in the following procedures:
(1) Warm up the cathode for a longer time than usually. (20 to 30 minutes in the STBY state.)
(2) Start the operation from the short pulse range and shift it gradually to the longer pulse ranges. If
the operation becomes unstable during this process, return it to the standby mode immediately.
Keep the state for 5 to 10 minutes until the operation is restarted.
(3) After transmission is made for about 15 minutes, conduct the tuning adjustment.
(4) Adjust RV1 within the receiver so that the bar graph of the tuning indicator on the display reaches
the reading 10 without saturation.

......Replacement of TRHPL (A202/A303) (JMA-9833-SA/9832-SA)

Remove the 4 screws fixing the TRHPL with the receiver and remove the TRHPL. When mounting the
TRHPL, take care of the mounting direction and mount it in the arrow direction facing it the
receiver front end.

......Replacement of Diode Limiter (A203/A303)

(JMA-9823-7XA/9XA, JMA-9822-6XA/9XA) ...........................

Remove the 4 screws fixing the TRHPL with the receiver. Remove the 4 screws fixing the diode limiter
and remove the 4 screws fixing the diode limiter with the PIN attenuator and remove diode limiter.
When mounting the diode limiter, take care of the mounting direction and mount it in the arrow
direction facing it the receiver front end.
Connect the wiring in the same way as before the replacement.

......Replacement of PIN Attenuator (A302)

(JMA-9823-7XA/9XA, JMA-9822-6XA/9XA) ...........................
Remove the 12 screws fixing the PIN attenuator and remove it in the way similar to the replacement of
TRHPL.
Connect the wiring in the same way as before the replacement.
8.4 REPLACEMENT OF MAJOR PARTS
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