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Stereo Modulator VP-7637A ( Panasonic )

[Outline] [Trouble-shoots]

Fig1. Front view.

• High separation ( 66dB or more )
• Low distortion ( 0.01% or less )
• Seven internal tone signals ( 30 Hz to 15kHz )
• Data sheet ( from  Helmut Singer Elektronik web site)
• VP-7637A
• VP-7635A
• VP-7621A

Trouble	Cause	Repair
Pilot signal level was lower and wasn't stable.	Chemical capacitors of clock generator were all leaked.	Replace leaked capacitors.
---	---	Check the voltage of the memory back up battery