Yaesu Musen General Coverage Receiver FRG-7700

This is a Yaesu Musen FRG-7700 general coverage receiver.
It can receive medium wave and shortwave bands.
Receiving frequency range: 150kHz - 29.999MHz
Receiving modes: SSB, CW, AM, Narrowband FM

On medium wave, I was able to receive NHK, AFN, TBS, Bunka Broadcasting, Nippon Broadcasting, and Radio Nippon.
On shortwave, I was able to receive Radio Nikkei (6MHz band) and overseas Japanese broadcasts (Beijing, Pyongyang, Taipei).
I have confirmed that noise is audible when switching bands from 0 to 29, but I cannot confirm reception on frequencies where there are no broadcasts.
When connected to an approximately 2-meter antenna wire, the meter swings well and reception is confirmed, as shown in the images.

There are scratches, dirt, and rust, so please refrain from purchasing if you are looking for a beautiful item.
I have confirmed that the 12 memory channels can be written to and read from, and that the clock and timer can be set.
The backup battery box had cracked plastic, so it has been replaced with a substitute.

As this product was released in 1980, it is over 40 years old. Therefore, even if it is currently working, there is a possibility that it may malfunction in the future, and I cannot provide support. Please consider this a junk item.

Accessories include an AC cord and a copy of the instruction manual.

As a bonus, I will include the non-working FRV-7700 VHF converter. Even when connected, VHF bands cannot be heard.
Additionally, the band switch sometimes gets stuck with two buttons pressed simultaneously. It can sometimes be fixed by holding down one switch and flicking the other with your finger.
If you have technical skills, please try to repair it so you can listen to airband or amateur radio.

Please understand that this is a junk item before considering a purchase.