Dolby Laboratories CP65 - Manual (Page 12)

2-6
Cat. No. 242, B-Chain Card
Jumper
Holder
(for storage) J1
Cat. No. 242
Mono low
frequency filter OFF
100mV
in
1V in
Magnetic Input
Sensitivity Setting
J5
J6
J7
J8
Cut jumpers for
high sensivity
power amplifiers
J1 Mono LF cut In/Out: selects optional low frequency cut when Mono (format 01) is
selected. In some cases the extended low frequency reponse may appear to be out
of balance with the restricted high frequency response needed for the correct
reproduction of mono optical sound-tracks. Move J1 to the ON position to attenuate
the low frequency response.
J5, J6, J7, J8 Output levels: Jumpers W5, W6, W7, and W8 are set at the factory for a
power amplifier input sensitivity of between 90 mV and 1.23 V. If the power amplifiers
used in the installation are very sensitive (10 mV to 100 mV input sensitivity), it may
be necessary to cut these jumpers.
See page 4-21 for information on setting the magnetic input sensitivity. The setting in effect
is indicated by the arrow shown above.
Cat. No. 249, Power Supply Module
Low Hi
J1
Cat. No. 249
BYPASS OUTPUT LEVEL RANGE
Hi
Low
J1 Bypass output level Hi/Low: Set to the Low bypass output range initially. If increased
bypass output gain is required, as determined during the bypass gain adjustment
later in this manual the jumper should then be placed in the Hi position.