Panasonic SA-VK31GC Service Manual page 33

Step 7 Put the capstan belt A temporarily as shown below.
Step 8 Put the capstan belt B on the motor ass'y pulley.
Step 9 Install the sub chassis to the mechanism, and then
tighten screws.
Step 10 Remove 3 screws.
Step 11 Put the capstan belt B as shown below.
Step 12 Put the capstan belt A on the motor ass'y pulley.
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SA-VK31GC / SA-VK31GS