Service manual

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Studio R@f@f@n@e Service Msnuaf
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Checkou Procedures
5.19 Signal to Ncise Ratio
Sgse: REF I 120 dB, A weighlsd,
REF 11 117 dB, A wwsighbed,
of each channel.
5.24 Turn OH Trsnsients
5.20 !ntarmeduiali@n ai%t@@$a@
spas: Na dangsr~us transients.
Spec at O dB Oatp~t (Fgil Powsr]: 8.005%.
laitis! GonditisnsX~ontrsls per standard.
8p@s at -35 db Output:: 0.02%+
Pro~8lure: From an on condition, turn sff the amplifier
Inltia1 Cowdltlons;: Controls per standard,
and monitor the output noise at the time of turn 08.
35 dB and measurE less than 0.02% IMD,
5,21 hEB Funstions
switch is engaged,
ODEP limit,
5.22 Display Set-Up
Sp@g; Ladder displays balance each other; OadicaWors
oilurninate at output voltages per chart below,
initial Gssditlo~s: ConlroBs pea standard. Meter Mode
Switch in the Bu%put Leve! positioa.
Prosedurs: With the display set to read output Bevel in-
ject a 1 kHz sins wave into both channels of the ampli-
fier- Adjust the level se that the -18 dB LEDs puke an
and OM. Adjust R78 sn "Ihe display board until the Ch 1
and Ch 2 -10 dB LEDs pulse at the same fraquency*
Note: "I"@ complete front panel needs to be disas-
sembled in order to access the display board.
Next, verify thaheah indicator illuminates per the chart
below.
Eiiestrical Checkout 5-5