Test Points For Tape Path Adjustment - Sanyo VHR-757G Service Manual

2-4. IF CIRCUIT ADJUSTMENT
¢ In this model, the circuits of the TUNER, IF, and RF Note: The 3 in tuner dose not need any adjustments, because
converter have been made into one. Therefore, should one precise adjustments were down before shipment.
circuit malfunction, the whole unit must be replaced.
¢ The adjustments for the IF (RF AGC) circuit of the 3 in 1
tuner are described below.
2-4-1. TEST EQUIPMENT AND STANDARD REQUIRED
2-4-2. LOCATION OF ADJUSTMENT POINT 2-4-3. RF AGC ADJ.
Picture of Monitor TV E-E mode
monitor TV
Adj. Location Adj. Value
VR (RF AGC) S/N is best point
(on the 3 in 1 tuner)
1. Connect the monitor TV to the VHF/UHF antenna output
terminal.
2. Connect the VHF or UHF antenna to the VHF/UHF antenna
input terminal.
3. Receive the middle electrical field (70 dBu. ~ 90 dBy) of the
VHF or UHF channel, and slowly turn the VR (RF AGC)
from the point where snow-noise is present to the point
where it just disappears from the monitor TV.
4. Confirm by monitor TV that there is no beat and saturation
(S/N is best point) when receiving any TV channel.
P36200B
Rear Panel ef. |
3 in 1 Tuner
CP-1 PWB
Assembly
VR [RF AGC
3 in 1 Tuner
Fig. 2-4-1
2-5. CHECKING THE RF CHANNEL
lf the TV and VCR are connected by an aerial output cable which has poor shielding characteristics, turn off the RF converter of
the VCR and use the VCR with an AV cable. To turn the RF converter off, input "00" when setting the RF (when "RF" is
displayed) during VCR pre-setting.
3. TEST POINTS FOR TAPE PATH ADJUSTMENT
Test points TP182 (ENV) and TP183 (SW-P) for tape path adjustment are shown in figure below.
For adjustment, refer to the separate volume "V95 | Mechanism Manual" (MM531433) and "V95 11 Mechanism Manual" (MS531500).
P66300D TP183 - TP182
(SW-P) (ENV.
VP-1 PWB Assembly Fig. 3-1
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