Hitachi 36UX52B\CZ77 Service Manual page 32

M7LXU
CAUTION: Insert the connector PFlEF on CPT PWB to minimize width
of horizontal lines as follows (only for TOSHIBA 36V CPT).
PF
(Ge:ter)
IX. MATCHING CHECK WITH OTHER INSTRUMENTS
1. VIDEO:1 INPUT TERMINAL MATCHING CHECK
Adjustment Preparation
(1)
(2)
(3)
Input the video signal to VIDEO 1 IN terminal.
The video signal level should be within 1 + 0.2 Vp-p
(75 ohm termination) with 100% while signal at this
time.
Input the audio signal to the AUDIO 1 IN terminal. The
audio signal level should be 400m Vrms f 20m Vrms at
this time. (Connect VCR or TV tuner.)
Connect a monitor TV to the VIDEO OUT terminals
and connect an audio AMP to the AUDIO OUT termi-
nals. (Or connect VIDEO IN and AUDIO IN terminals
of a standard monitor instead.)
Adjustment Procedure
(1) Check that the set receives signal when select the
Input mode by pressing the Input (FUNCTION) button
of front side of set or remote control.
(2) When external input is performed, the video and audio
should not be abnormal.
The 100% while signal that RF input receives should
be as bright as the video signal IVp-p (75 ohm termi-
nation).
As for the sound, when the 100% modulation that RF
input receives is 25KHZ, DIV., the sound level should
be as much as external audio signal (400 Vrms) level.
(3) Refer to the next item (IV, 2-2).
Adjustment Procedure
(1) Check that the set receives signal at Input 2 mode.
3. VIDEO:3 INPUTTERMINAL MATCHING CHECK
Adiustment Preparation
(1) Same as 1 (1)
Adjustment Procedure
(I) Check that the set receives signal at Input 3 mode.
4. S-IN INPUTTERMINAL MATCHING CHECK
Adjustment Preparation
(1) Connect the video/chroma signal to S-IN terminal.
(2) Connect the sound signal to AUDIO input terminals.
Adjustment Procedure
(1) Check that the set receives signal at S-IN mode.
5. AUDIO OUT LEVEL CHECK
Adiustment Preparation
(1) Input the same audio signal at item l(2) to AUDIO IN
terminal (L). At this time, connect nothing to R terminal.
(2) Input the same audio signal as item l(2) to AUDIO IN
terminal (R). At this time, connect nothing to L terminal.
(3) Check that the normal sound is output from both sides
of the speakers when signal in item (I) is input.
(4) Check that the normal sound is output from only the
right (R) speaker when signal in item (2) is input.
Adjustment Procedure
(1)
(2)
X.
1.
Check that the audio output of AUDIO AMP connected
to AUDIO HiFi OUT terminal or monitor changes
according to "VOLUME" of the set.
Confirm that the output level of item (1) should be
1 Vrms (2.8 Vp-p) f 20%.
(Above level is equivalent to VOL. MAX. 100% modu-
lated signal input.)
SAFETY CHECK
POLARITY CHECK
This check is performed according to UL standard
requirement. There should be electricity between AC
Power Cord and Chassis Earth.
2. VIDEO 2 INPUTTERMINAL MATCHING CHECK
Adjustment Preparation
(1) Same as 1 (1).
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