Test Items - Yamaha P-120 Service Manual

D.

Test Items

No. 7-seg. LED
(01: ROM Version Check
1
2 (02: ROM Check 1
(03: RAM Check 1
3
(04: WAVE ROM Check
4
(11: Tone Generator 1 Check A chromatic scale of 32 notes (from F3 to C6) is played automatically.
11
(G1
(12: Tone Generator 2 Check A chromatic scale of 32 notes (from F3 to C6) is played automatically.
12
(G2
(13: Pitch Precision Check
13
P I (
Volume Check
14 (14: Output Level R Check
OPA
Test Function and Judgment criteria etc.
Checks ROM version.
Make sure that the 7-seg.LED alternately indicates "Px.x" (version of the pro-
gram) and "Uy.y" (version of the wave).
Checks the ROMs on CPU bus.
This test checks all the ROMs on CPU bus.
Make sure that the 7-seg.LED indicates the test result as follows.
When the result is good: PAS
When the result is no good: nG
Checks the RAMs on CPU bus.
This test checks all the RAMs on CPU bus.
Make sure that the 7-seg.LED indicates the test result as follows.
When the result is good: PAS
When the result is no good: nG
Checks the ROMs on TG bus.
Make sure that the 7-seg.LED indicates the test result as follows.
When the result is good: PAS
When the result is no good: nG
Make sure by hearing that no abnomal sounds or noises are generated.
Make sure by hearing that no abnomal sounds or noises are generated.
Connect a frequency counter to the [PHONES] jack and measure a
frequency.
Acceptable frequency range is as follows.
440.0±0.2 [Hz]
It is enough to measure for any one channel in 1-L, 1-R, 2-L and 2-R.
Connect a level meter to the [PHONES] jack. (Application load is 33Ω)
This test must be performed for all the channel in 1-L, 1-R, 2-L and 2-R.
Acceptable level ranges for the maximum volume and the minimum volume
are as follows.
Maximum Volume: +5 ±2 [dBm]
Minimum Volume: -70.0 [dBm] or less
Connect a level meter to the [PHONES] jack. (Application load is 33Ω)
Acceptable level ranges are as follows.
1-L, 2-L: -55.0 [dBm] or less
1-R, 2-R: +5.5±2 [dBm]
Connect a level meter to the [AUX OUT L/L+R] jack and the [AUX OUT R]
jack. (Application load is 10kΩ)
Acceptable level ranges are as follows.
L/L+R: -60.0 [dBm] or less
R: +10.5±2 [dBm]
P-120/P-120S
27