Note:
{ }: Inside the digital board
6.6.8.2. DEFECTIVE ITS (Integrated Telephone System) SECTION
1. No handset transmission / reception and no monitor reception
Perform a signal test in the ITS or the NCU section and locate a
defective point (where the signal disappears) on each route
between the handset microphone and telephone line (sending), or
between the telephone line and the handset speaker (receiving),or
between the microphone and the telephone line (sending), or
between the telephone line and the speaker (receiving). Check the
components at that point. CHECK SHEET() isuseful for this
investigation.
2. No pulse dialing
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